US5901185A
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Systems and methods for data-augmented, pilot-symbol-assisted radiotelephone communications
Assignee: Ericsson Inc
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Filing: 1996-04-15
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Granted: 1999-05-04
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Expires: 2016-04-15
Abstract
Abstract Radiotelephone communications, such as voice or data, are processed to produce a pilot symbol assisted modulation (PSAM) communications symbol sequence, the PSAM communications symbol sequence including a plurality of predetermined pilot symbols interleaved with a plurality of information symbols representing the radiotelephone communications. The PSAM communications symbol sequence is communicated over a radiotelephone communications channel having a transfer characteristic, producing a sequence of communications symbol data representing the communicated sequence of communication symbols. Pilot symbol data, corresponding to pilot symbols, and information symbol data, corresponding to information symbols, are identified in the sequence of communications symbol data. A data-augmented estimate of the transfer characteristic of the radiotelephone communications channel is generated from the pilot symbol data and the information symbol data. Estimates of information symbols are generated from the corresponding information symbol data and the generated estimate of the transfer characteristic. Radiotelephone communications are decoded from the generated estimates of the information symbols. Preferably, estimates of the transfer characteristic are iteratively generated by identifying a group of information symbol data corresponding to a group of information symbols, generating estimates of the group of identified information symbols from the group of information symbol data and a previously generated estimate of the radiotelephone communications channel transfer characteristic, and generating a new estimate of the transfer characteristic from the pilot symbol data, the information symbol data, and previously generated estimates of information symbols.
Inventors
- 👤 Amer Hassan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:04
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/02; H04L25/03; H04L25/03006; H04L25/03171; H04B; H04B7/00; H04B7/005
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
228 words
A pilot symbol assisted modulation (PSAM) radiotelephone communications method, comprising the steps of: processing radiotelephone communications to produce a PSAM communications symbol sequence, the PSAM communications symbol sequence including a plurality of predetermined pilot symbols interleaved with a plurality of information symbols representing the radiotelephone communications; communicating the PSAM communications symbol sequence over a radiotelephone communications channel having a transfer characteristic to thereby produce a sequence of communications symbol data representing the communicated sequence of communication symbols; identifying pilot symbol data corresponding to pilot symbols and information symbol data corresponding to information symbols, in the sequence of communications symbol data; generating a data-augmented estimate of the transfer characteristic from the pilot symbol data and the information symbol data, including the steps of: generating an estimate of the transfer characteristic from the pilot symbol data; identifying a group of information symbol data corresponding to a group of information symbols; generating estimates of the group of identified information symbols from the group of information symbol data and a previously generated estimate of the transfer characteristic; and generating a new estimate of the transfer characteristic from the pilot symbol data, generated estimates of information symbols, and the information symbol data; generating estimates of information symbols from the corresponding information symbol data and a generated estimate of the transfer characteristic; and decoding radiotelephone communications from the generated estimates of the information symbols.
Claim 2
Dependent Claim
228 words
A pilot symbol assisted modulation (PSAM) radiotelephone communications method, comprising the steps of: processing radiotelephone communications to produce a PSAM communications symbol sequence, the PSAM communications symbol sequence including a plurality of predetermined pilot symbols interleaved with a plurality of information symbols representing the radiotelephone communications; communicating the PSAM communications symbol sequence over a radiotelephone communications channel having a transfer characteristic to thereby produce a sequence of communications symbol data representing the communicated sequence of communication symbols; identifying pilot symbol data corresponding to pilot symbols and information symbol data corresponding to information symbols, in the sequence of communications symbol data; generating a data-augmented estimate of the transfer characteristic from the pilot symbol data and the information symbol data, including the steps of: generating an estimate of the transfer characteristic from the pilot symbol data; identifying a group of information symbol data corresponding to a group of information symbols; generating estimates of the group of identified information symbols from the group of information symbol data and a previously generated estimate of the transfer characteristic; and generating a new estimate of the transfer characteristic from the pilot symbol data, generated estimates of information symbols, and the information symbol data; generating estimates of information symbols from the corresponding information symbol data and a generated estimate of the transfer characteristic; and decoding radiotelephone communications from the generated estimates of the information symbols.
Claim 3
Dependent Claim
44 words
A method according to claim 1 wherein said step of identifying a group of information symbol data comprises the step of identifying a group of information symbol data corresponding to a group of information symbols adjacent pilot symbols in the PSAM communications symbol sequence.
Claim 4
Dependent Claim
46 words
A method according to claim 1 wherein said step of identifying a group of information symbol data comprises the step of identifying a group of information symbols data corresponding to a group of information symbols adjacent previously estimated information symbols in the PSAM communications symbol sequence.
Claim 5
Dependent Claim
76 words
A method according to claim 1 wherein said step of identifying a group of information symbol data comprises the step of identifying a group of information symbol data corresponding to a group of information symbols in the PSAM communications symbol sequence such that estimates of the group of information symbols, generated from the group of information symbol data and a previous estimate of the transfer characteristic, have an associated error probability less than a predetermined threshold.
Claim 6
Independent Claim
221 words
A method of recovering pilot symbol assisted modulation (PSAM) audiotelephone communications from a communications symbol data sequence representing a PSAM communications symbol sequence communicated over a audiotelephone communications channel having an associated transfer characteristic, the PSAM communications symbol sequence including a sequence of information symbols interleaved with a plurality of predetermined pilot symbols, the method comprising the steps of: identifying pilot symbol data corresponding to pilot symbols and information symbol data corresponding to information symbols, in the sequence of communications symbol data; generating a data-augmented estimate of the transfer characteristic from the pilot symbol data and the information symbol data, including the steps of: generating an estimate of the transfer characteristic from the pilot symbol data; identifying a group of information symbol data corresponding to a group of information symbols of the PSAM communications symbol sequence; generating estimates of the group of information symbols from the group of information symbol data and a previously generated estimate of the transfer characteristic; and generating a new estimate of the transfer characteristic from the pilot symbol data, generated estimates of information symbols, and the information symbol data; generating estimates of information symbols of the PSAM communications symbol sequence from the information symbol data and a generated estimate of the transfer characteristic; and decoding the radiotelephone communications from the generated estimates of the information symbols.
Claim 7
Independent Claim
221 words
A method of recovering pilot symbol assisted modulation (PSAM) audiotelephone communications from a communications symbol data sequence representing a PSAM communications symbol sequence communicated over a audiotelephone communications channel having an associated transfer characteristic, the PSAM communications symbol sequence including a sequence of information symbols interleaved with a plurality of predetermined pilot symbols, the method comprising the steps of: identifying pilot symbol data corresponding to pilot symbols and information symbol data corresponding to information symbols, in the sequence of communications symbol data; generating a data-augmented estimate of the transfer characteristic from the pilot symbol data and the information symbol data, including the steps of: generating an estimate of the transfer characteristic from the pilot symbol data; identifying a group of information symbol data corresponding to a group of information symbols of the PSAM communications symbol sequence; generating estimates of the group of information symbols from the group of information symbol data and a previously generated estimate of the transfer characteristic; and generating a new estimate of the transfer characteristic from the pilot symbol data, generated estimates of information symbols, and the information symbol data; generating estimates of information symbols of the PSAM communications symbol sequence from the information symbol data and a generated estimate of the transfer characteristic; and decoding the radiotelephone communications from the generated estimates of the information symbols.
Claim 8
Dependent Claim
44 words
A method according to claim 5 wherein said step of identifying a group of information symbol data comprises the step of identifying a group of information symbols data corresponding to a group of information symbols adjacent pilot symbols in the PSAM communications symbol sequence.
Claim 9
Dependent Claim
46 words
A method according to claim 5 wherein said step of identifying a group of information symbol data comprises the step of identifying a group of information symbols data corresponding to a group of information symbols adjacent previously estimated information symbols in the PSAM communications symbol sequence.
Claim 10
Dependent Claim
76 words
A method according to claim 5 wherein said step of identifying a group of information symbol data comprises the step of identifying a group of information symbol data corresponding to a group of information symbols in the PSAM communications symbol sequence such that estimates of the group of information symbols, generated from the group of information symbol data and a previous estimate of the transfer characteristic, have an associated error probability less than a predetermined threshold.
Claim 11
Independent Claim
216 words
A method of estimating a transfer characteristic of a radiotelephone communications channel from a sequence of communications symbol data representing a radiotelephone communications signal communicated over the radiotelephone communications channel, the radiotelephone communications signal representing a pilot symbol assisted modulation (PSAM) communications symbol sequence including a plurality of pilot symbols interleaved with a plurality of information symbols, the method comprising the steps of: identifying pilot symbol data and information symbol data in the sequence of communications symbol data, the pilot symbol data corresponding to pilot symbols in the PSAM communications symbol sequence and the information symbol data corresponding to information symbols in the PSAM communications symbol sequence; and generating a data-augmented estimate of the transfer characteristic from the pilot symbol data and the information symbol data, including the steps of: generating a first estimate of the transfer characteristic from the pilot symbol data; identifying a group of information symbol data corresponding to a group of information symbols in the PSAM communications symbol sequence; generating estimates of the group of information symbols from the group of information symbol data and the first estimate of the transfer characteristic; and generating a second estimate of the transfer characteristic from the group of information symbol data, the generated estimates of the group of information symbols and the pilot symbol data.
Claim 12
Independent Claim
216 words
A method of estimating a transfer characteristic of a radiotelephone communications channel from a sequence of communications symbol data representing a radiotelephone communications signal communicated over the radiotelephone communications channel, the radiotelephone communications signal representing a pilot symbol assisted modulation (PSAM) communications symbol sequence including a plurality of pilot symbols interleaved with a plurality of information symbols, the method comprising the steps of: identifying pilot symbol data and information symbol data in the sequence of communications symbol data, the pilot symbol data corresponding to pilot symbols in the PSAM communications symbol sequence and the information symbol data corresponding to information symbols in the PSAM communications symbol sequence; and generating a data-augmented estimate of the transfer characteristic from the pilot symbol data and the information symbol data, including the steps of: generating a first estimate of the transfer characteristic from the pilot symbol data; identifying a group of information symbol data corresponding to a group of information symbols in the PSAM communications symbol sequence; generating estimates of the group of information symbols from the group of information symbol data and the first estimate of the transfer characteristic; and generating a second estimate of the transfer characteristic from the group of information symbol data, the generated estimates of the group of information symbols and the pilot symbol data.
Claim 13
Dependent Claim
114 words
A method according to claim 9 wherein said step of generating a data-augmented estimate of the transfer characteristic further comprises the steps of: identifying a new group of information symbol data corresponding to a group of information symbols in the PSAM communications symbol sequence; generating estimates of the group of information symbols corresponding to the new group of information symbol data from the new group of information symbol data and a previous estimate of the transfer characteristic; and generating a new estimate of the transfer characteristic of the radiotelephone communications channel from the new group of information symbol data, the generated estimates of the new group of information symbols and the pilot symbol data.
Claim 14
Dependent Claim
44 words
A method according to claim 10 wherein said step of identifying a group of information symbol data comprises the step of identifying a group of information symbol data corresponding to a group of information symbols adjacent pilot symbols in the PSAM communications symbol sequence.
Claim 15
Dependent Claim
88 words
A method according to claim 10: wherein said step of identifying a group of information symbol data comprises the step of identifying a group of information symbol data corresponding to a group of information symbols adjacent pilot symbols in the PSAM communications symbol sequence; and wherein said step of identifying a new group of information symbol data comprises the step of identifying a new group of information symbol data corresponding to a new group of information symbols adjacent previously estimated information symbols in the PSAM communications symbol sequence.
Claim 16
Dependent Claim
76 words
A method according to claim 9 wherein said step of identifying a group of information symbol data comprises the step of identifying a group of information symbol data corresponding to a group of information symbols in the PSAM communications symbol sequence such that estimates of the group of information symbols, generated from the group of information symbol data and the first estimate of the transfer characteristic, have an associated error probability less than a predetermined threshold.
Claim 17
Dependent Claim
151 words
A method according to claim 10: wherein said step of identifying a group of information symbol data comprises the step of identifying a group of information symbol data corresponding to a group of information symbols in the PSAM communications symbol sequence such that estimates of the group of information symbols, generated from the group of information symbol data and the first estimate of the transfer characteristic, have an associated error probability less than a predetermined threshold; and wherein said step of identifying a new group of information symbol data comprises the step of identifying a new group of information symbol data corresponding to a new group of information symbols in the PSAM communications symbol sequence such that estimates of the new group of information symbols, generated from the group of information symbol data and the previous estimate of the transfer characteristic, have an associated error probability less than a predetermined threshold.
Claim 18
Dependent Claim
307 words
A pilot symbol assisted modulation (PSAM) radiotelephone communications system, comprising: radiotelephone communications processing means for processing radiotelephone communications to produce a PSAM communications symbol sequence, said PSAM communications symbol sequence including a plurality of predetermined pilot symbols interleaved with a plurality of information symbols representing the processed radiotelephone communications; a radiotelephone communications channel which communicates the PSAM communications symbol sequence and produces a sequence of communications symbol data representing the communicated sequence of communication symbols, said radiotelephone communications channel having an associated transfer characteristic; symbol data identifying means responsive to said radiotelephone communications channel, for identifying pilot symbol data corresponding to pilot symbols and information symbol data corresponding to information symbols, in said sequence of communications symbol data; transfer characteristic estimate generating means, responsive to said symbol data identifying means, for generating a data-augmented estimate of said transfer characteristic from said pilot symbol data and said information symbol data, including: means for generating an estimate of said transfer characteristic from said pilot symbol data; means for identifying a group of information symbol data corresponding to a group of information symbols; means, responsive to said group identifying means, for generating estimates of the group of information symbols from the group of information symbol data and a previously generated estimate of the transfer characteristic; and means, responsive to said group estimate generating means, for generating a new estimate of the transfer characteristic from said pilot symbol data, generated estimates of information symbols, and said information symbol data; information symbol estimate generating means, responsive to said symbol data identifying means and said transfer characteristic estimate generating means, for generating estimates of information symbols from the corresponding information symbol data and a generated estimate of the transfer characteristic; and decoding means, responsive to said information symbol estimate generating means, for decoding radiotelephone communications from the generated estimates of the information symbols.
Claim 19
Dependent Claim
307 words
A pilot symbol assisted modulation (PSAM) radiotelephone communications system, comprising: radiotelephone communications processing means for processing radiotelephone communications to produce a PSAM communications symbol sequence, said PSAM communications symbol sequence including a plurality of predetermined pilot symbols interleaved with a plurality of information symbols representing the processed radiotelephone communications; a radiotelephone communications channel which communicates the PSAM communications symbol sequence and produces a sequence of communications symbol data representing the communicated sequence of communication symbols, said radiotelephone communications channel having an associated transfer characteristic; symbol data identifying means responsive to said radiotelephone communications channel, for identifying pilot symbol data corresponding to pilot symbols and information symbol data corresponding to information symbols, in said sequence of communications symbol data; transfer characteristic estimate generating means, responsive to said symbol data identifying means, for generating a data-augmented estimate of said transfer characteristic from said pilot symbol data and said information symbol data, including: means for generating an estimate of said transfer characteristic from said pilot symbol data; means for identifying a group of information symbol data corresponding to a group of information symbols; means, responsive to said group identifying means, for generating estimates of the group of information symbols from the group of information symbol data and a previously generated estimate of the transfer characteristic; and means, responsive to said group estimate generating means, for generating a new estimate of the transfer characteristic from said pilot symbol data, generated estimates of information symbols, and said information symbol data; information symbol estimate generating means, responsive to said symbol data identifying means and said transfer characteristic estimate generating means, for generating estimates of information symbols from the corresponding information symbol data and a generated estimate of the transfer characteristic; and decoding means, responsive to said information symbol estimate generating means, for decoding radiotelephone communications from the generated estimates of the information symbols.
Claim 20
Dependent Claim
35 words
A system according to claim 15 wherein said group identifying means identifies a group of information symbol data corresponding to a group of information symbols adjacent said pilot symbols in said PSAM communications symbol sequence.
Claim 21
Dependent Claim
36 words
A system according to claim 15 wherein said group identifying means identifies a group of information symbol data corresponding to a group of information symbols adjacent previously estimated information symbols in said PSAM communications symbol sequence.
Claim 22
Dependent Claim
66 words
A system according to claim 15 wherein said group identifying means identifies a group of information symbol data corresponding to a group of information symbols in the PSAM communications symbol sequence such that estimates of the group of information symbols, generated from said group of information symbol data and a previous estimate of the transfer characteristic, have an associated error probability less than a predetermined threshold.
Claim 23
Independent Claim
286 words
An apparatus for recovering pilot symbol assisted modulation (PSAM) radiotelephone communications from a communications symbol data sequence representing a PSAM communications symbol sequence communicated over a radiotelephone communications channel having an associated transfer characteristic, the PSAM communications symbol sequence including a sequence of information symbols interleaved with a plurality of predetermined pilot symbols, the apparatus comprising: symbol data identifying means for identifying pilot symbol data corresponding to pilot symbols and information symbol data corresponding to information symbols, in the sequence of communications symbol data; transfer characteristic estimate generating means, responsive to said symbol data identifying means, for generating a data-augmented estimate of the transfer characteristic from said pilot symbol data and said information symbol data, including: means for generating an estimate of the transfer characteristic from said pilot symbol data; means for identifying a group of information symbol data corresponding to a group of information symbols of the PSAM communications symbol sequence; means, responsive to said group identifying means, for generating estimates of the group of information symbols from said group of information symbol data and a previously generated estimate of the transfer characteristic; and means, responsive to said symbol group estimate generating means, for generating a new estimate of the transfer characteristic from said pilot symbol data, generated estimates of information symbols, and said information symbol data; information symbol estimate generating means, responsive to said symbol data identifying means and to said transfer characteristic estimate generating means, for generating estimates of information symbols of the PSAM communications symbol sequence from said information symbol data and a generated estimate of the transfer characteristic; and decoding means, responsive to said information symbol estimate generating means, for decoding radiotelephone communications from the generated estimates of the information symbols.
Claim 24
Independent Claim
286 words
An apparatus for recovering pilot symbol assisted modulation (PSAM) radiotelephone communications from a communications symbol data sequence representing a PSAM communications symbol sequence communicated over a radiotelephone communications channel having an associated transfer characteristic, the PSAM communications symbol sequence including a sequence of information symbols interleaved with a plurality of predetermined pilot symbols, the apparatus comprising: symbol data identifying means for identifying pilot symbol data corresponding to pilot symbols and information symbol data corresponding to information symbols, in the sequence of communications symbol data; transfer characteristic estimate generating means, responsive to said symbol data identifying means, for generating a data-augmented estimate of the transfer characteristic from said pilot symbol data and said information symbol data, including: means for generating an estimate of the transfer characteristic from said pilot symbol data; means for identifying a group of information symbol data corresponding to a group of information symbols of the PSAM communications symbol sequence; means, responsive to said group identifying means, for generating estimates of the group of information symbols from said group of information symbol data and a previously generated estimate of the transfer characteristic; and means, responsive to said symbol group estimate generating means, for generating a new estimate of the transfer characteristic from said pilot symbol data, generated estimates of information symbols, and said information symbol data; information symbol estimate generating means, responsive to said symbol data identifying means and to said transfer characteristic estimate generating means, for generating estimates of information symbols of the PSAM communications symbol sequence from said information symbol data and a generated estimate of the transfer characteristic; and decoding means, responsive to said information symbol estimate generating means, for decoding radiotelephone communications from the generated estimates of the information symbols.
Claim 25
Dependent Claim
37 words
An apparatus according to claim 19 wherein said group identifying means comprises means for identifying a group of information symbols data corresponding to a group of information symbols adjacent pilot symbols in the PSAM communications symbol sequence.
Claim 26
Dependent Claim
39 words
An apparatus according to claim 19 wherein said group identifying means comprises means for identifying a group of information symbol data corresponding to a group of information symbols adjacent previously estimated information symbols in the PSAM communications symbol sequence.
Claim 27
Dependent Claim
66 words
An apparatus according to claim 19 wherein said group identifying means identifies a group of information symbol data corresponding to a group of information symbols in the PSAM communications symbol sequence such that estimates of said group of information symbols, generated from said group of information symbol data and a previous estimate of the transfer characteristic, have an associated error probability less than a predetermined threshold.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 7.5 Years (Year 8) | 2006-05-03 | 2006-11-02 | 2007-05-04 | $3760.00 | Window Closed / Lapsed |
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