US6097716A
Expired / Lapsed
US
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Rate detection for multi-rate communications
Assignee: Nokia of America Corp
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Filing: 1997-12-12
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Granted: 2000-08-01
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Expires: 2017-12-12
Abstract
Abstract For a given rate set, an IS-95 transmitter can generate an IS-95 signal at any one of four different data rates. According to the present invention, an IS-95 receiver performs a statistical analysis on the received data stream to determine which particular data rate was used by the transmitter. In particular, the IS-95 receiver uses partially decoded data from the received signal to generate a statistical value corresponding to the log likelihood function for each of the four possible data rates and selects the data rate having the largest corresponding statistical value as the data rate used by the transmitter to generate the signal. The receiver then uses this detected data rate to complete the process of decoding and reconstructing the data from the received signal.
Inventors
- 👤 Farrokh Abrishamkar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:11
CPC Classifications
H; H04; H04W; H04W28/00; H04W28/16; H04W28/18; H04W28/22
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
87 words
A method for processing a received signal, wherein the received signal has been generated based on an unknown data rate of two or more possible data rates, comprising the steps of: (a) partially decoding the received signal to generate partially decoded data; (b) for each possible data rate, generating a statistical value from the partially decoded data; (c) determining the unknown data rate by comparing the statistical values for the possible data rates; and (d) further decoding the partially decoded data using the determined unknown data rate.
Claim 2
Independent Claim
87 words
A method for processing a received signal, wherein the received signal has been generated based on an unknown data rate of two or more possible data rates, comprising the steps of: (a) partially decoding the received signal to generate partially decoded data; (b) for each possible data rate, generating a statistical value from the partially decoded data; (c) determining the unknown data rate by comparing the statistical values for the possible data rates; and (d) further decoding the partially decoded data using the determined unknown data rate.
Claim 3
Dependent Claim
26 words
The invention of claim 1, wherein, for each possible data rate, the statistical value corresponds to a log likelihood function based on the partially decoded data.
Claim 4
Dependent Claim
31 words
The invention of claim 1, wherein the received signal is an IS-95 signal generated based on one of four possible data rates for either Rate Set 1 or Rate Set 2.
Claim 5
Dependent Claim
35 words
The invention of claim 1, wherein: the partial decoding comprises one or more of power bit erasure, block de-interleaving, and depuncture; and the further decoding comprises one or more of symbol de-repetition and convolutional decoding.
Claim 6
Dependent Claim
32 words
The invention of claim 1, wherein, for each possible data rate, the statistical value is generated as a function of the partially decoded data, a signal amplitude, and a received signal envelope.
Claim 7
Dependent Claim
20 words
The invention of claim 5, wherein the signal amplitude is estimated from channel state information corresponding to the received signal.
Claim 8
Dependent Claim
39 words
The invention of claim 1, wherein, for each possible data rate, the statistical value is accumulated over a plurality of sets of data, wherein each set of data corresponds to a maximum repetition rate for the possible data rates.
Claim 9
Dependent Claim
129 words
The invention of claim 1, wherein: the received signal is an IS-95 signal generated based on one of four possible data rates for either Rate Set 1 or Rate Set 2; the partial decoding comprises power bit erasure and block de-interleaving; for Rate Set 2, the partial decoding further comprises depuncture; the further decoding comprises symbol de-repetition and convolutional decoding; for each data rate, the statistical value is generated as a log likelihood function based on the partially decoded data, a signal amplitude, and a received signal envelope, wherein the statistical value is accumulated over a plurality of sets of data, wherein each set of data comprises eight samples of the partially decoded data; and the signal amplitude is estimated from channel state information corresponding to the received signal.
Claim 10
Independent Claim
92 words
An apparatus for processing a received signal, wherein the received signal has been generated based on an unknown data rate of two or more possible data rates, comprising: (a) means for partially decoding the received signal to generate partially decoded data; (b) means for generating a statistical value from the partially decoded data for each possible data rate; (c) means for determining the unknown data rate by comparing the statistical values for the possible data rates; and (d) means for further decoding the partially decoded data using the determined unknown data rate.
Claim 11
Independent Claim
92 words
An apparatus for processing a received signal, wherein the received signal has been generated based on an unknown data rate of two or more possible data rates, comprising: (a) means for partially decoding the received signal to generate partially decoded data; (b) means for generating a statistical value from the partially decoded data for each possible data rate; (c) means for determining the unknown data rate by comparing the statistical values for the possible data rates; and (d) means for further decoding the partially decoded data using the determined unknown data rate.
Claim 12
Dependent Claim
26 words
The invention of claim 9, wherein, for each possible data rate, the statistical value corresponds to a log likelihood function based on the partially decoded data.
Claim 13
Dependent Claim
31 words
The invention of claim 9, wherein the received signal is an IS-95 signal generated based on one of four possible data rates for either Rate Set 1 or Rate Set 2.
Claim 14
Dependent Claim
35 words
The invention of claim 9, wherein: the partial decoding comprises one or more of power bit erasure, block de-interleaving, and depuncture; and the further decoding comprises one or more of symbol de-repetition and convolutional decoding.
Claim 15
Dependent Claim
32 words
The invention of claim 9, wherein, for each possible data rate, the statistical value is generated as a function of the partially decoded data, a signal amplitude, and a received signal envelope.
Claim 16
Dependent Claim
20 words
The invention of claim 13, wherein the signal amplitude is estimated from channel state information corresponding to the received signal.
Claim 17
Dependent Claim
39 words
The invention of claim 9, wherein, for each possible data rate, the statistical value is accumulated over a plurality of sets of data, wherein each set of data corresponds to a maximum repetition rate for the possible data rates.
Claim 18
Dependent Claim
129 words
The invention of claim 9, wherein: the received signal is an IS-95 signal generated based on one of four possible data rates for either Rate Set 1 or Rate Set 2; the partial decoding comprises power bit erasure and block de-interleaving; for Rate Set 2, the partial decoding further comprises depuncture; the further decoding comprises symbol de-repetition and convolutional decoding; for each data rate, the statistical value is generated as a log likelihood function based on the partially decoded data, a signal amplitude, and a received signal envelope, wherein the statistical value is accumulated over a plurality of sets of data, wherein each set of data comprises eight samples of the partially decoded data; and the signal amplitude is estimated from channel state information corresponding to the received signal.
Claim 19
Dependent Claim
100 words
A receiver adapted to process a received signal, wherein the received signal has been generated based on an unknown data rate of two or more possible data rates, comprising: (a) a first decoder adapted to partially decode the received signal to generate partially decoded data; (b) a rate detector adapted to generate a statistical value from the partially decoded data for each possible data rate and determine the unknown data rate by comparing the statistical values for the possible data rates; and (c) a second decoder adapted to further decode the partially decoded data using the determined unknown data rate.
Claim 20
Dependent Claim
100 words
A receiver adapted to process a received signal, wherein the received signal has been generated based on an unknown data rate of two or more possible data rates, comprising: (a) a first decoder adapted to partially decode the received signal to generate partially decoded data; (b) a rate detector adapted to generate a statistical value from the partially decoded data for each possible data rate and determine the unknown data rate by comparing the statistical values for the possible data rates; and (c) a second decoder adapted to further decode the partially decoded data using the determined unknown data rate.
Claim 21
Dependent Claim
26 words
The invention of claim 17, wherein, for each possible data rate, the statistical value corresponds to a log likelihood function based on the partially decoded data.
Claim 22
Dependent Claim
31 words
The invention of claim 17, wherein the received signal is an IS-95 signal generated based on one of four possible data rates for either Rate Set 1 or Rate Set 2.
Claim 23
Dependent Claim
40 words
The invention of claim 17, wherein: the first decoder comprises one or more of a power bit eraser, a block de-interleaver, and a depuncturer; and the second decoder comprises one or more of a symbol de-repeater and a convolutional decoder.
Claim 24
Dependent Claim
32 words
The invention of claim 17, wherein, for each possible data rate, the statistical value is generated as a function of the partially decoded data, a signal amplitude, and a received signal envelope.
Claim 25
Dependent Claim
20 words
The invention of claim 21, wherein the signal amplitude is estimated from channel state information corresponding to the received signal.
Claim 26
Dependent Claim
39 words
The invention of claim 17, wherein, for each possible data rate, the statistical value is accumulated over a plurality of sets of data, wherein each set of data corresponds to a maximum repetition rate for the possible data rates.
Claim 27
Dependent Claim
134 words
The invention of claim 17, wherein: the received signal is an IS-95 signal generated based on one of four possible data rates for either Rate Set I or Rate Set 2; the first decoder comprises a power bit eraser and a block de-interleaver; for Rate Set 2, the first decoder further comprises a depuncturer; the second decoder comprises a symbol de-repeater and a convolutional decoder; for each data rate, the statistical value is generated as a log likelihood function based on the partially decoded data, a signal amplitude, and a received signal envelope, wherein the statistical value is accumulated over a plurality of sets of data, wherein each set of data comprises eight samples of the partially decoded data; and the signal amplitude is estimated from channel state information corresponding to the received signal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-08-01 | 2004-01-31 | 2004-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-08-01 | 2008-01-31 | 2008-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-08-01 | 2012-01-31 | 2012-08-01 | $7700.00 | Window Closed / Lapsed |