US5430743A
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US
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Method and apparatus for recovering data in a radio communication system
Assignee: Motorola Solutions Inc
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Filing: 1993-06-29
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Granted: 1995-07-04
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Expires: 2013-06-29
Abstract
Abstract A radio communication system receiver employs a demodulator (104) to recover a received signal. The receiver of the present invention further includes a channel quality estimator (222) for estimating a characteristic of the communication channel over which the signal is received. A first or second decoding technique (220) is selectively employed using the estimated communication channel quality value (223). In this manner, an improved receiver is provided that is able to realize the benefits of either the first or the second decoding technique, depending the channel condition.
Inventors
- 👤 Lawrence J. Marturano
- 👤 Daehyoung Hong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:51
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/0001; H04L1/0036; H04L1/004; H04L1/0045; H04L1/0056; H04L1/0057; H04L1/0061
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
87 words
A radio communication system receiver, comprising: A) means for demodulating a signal presently received over a communication channel, to produce a presently received demodulated signal; B) means for estimating a present characteristic of the communication channel to produce a present estimated communication channel characteristic; C) means for decoding receiver demodulated signals using a first decoding technique; and D) means for using the present estimated communication channel characteristic to switch from the first decoding technique to a second decoding technique, to thereby decode the presently received demodulated signal.
Claim 2
Dependent Claim
87 words
A radio communication system receiver, comprising: A) means for demodulating a signal presently received over a communication channel, to produce a presently received demodulated signal; B) means for estimating a present characteristic of the communication channel to produce a present estimated communication channel characteristic; C) means for decoding receiver demodulated signals using a first decoding technique; and D) means for using the present estimated communication channel characteristic to switch from the first decoding technique to a second decoding technique, to thereby decode the presently received demodulated signal.
Claim 3
Dependent Claim
20 words
The radio communication system receiver of claim 1, wherein the means for demodulating comprises a 16-quadrature amplitude modulation (16-QAM) demodulator.
Claim 4
Dependent Claim
29 words
The radio communication system receiver of claim 1, wherein the means for estimating a characteristic comprises means for determining a bit error rate (BER) value for the communication channel.
Claim 5
Dependent Claim
29 words
The radio communication system receiver of claim 1, wherein the means for estimating a characteristic comprises means for determining a strength of the signal received over the communication channel.
Claim 6
Dependent Claim
27 words
The radio communication system receiver of claim 1, wherein the means for estimating a characteristic comprises means for determining a carrier-to-interference (C/I) ratio for the communication channel.
Claim 7
Dependent Claim
20 words
The radio communication system receiver of claim 1, wherein the first decoding technique comprises a cyclic redundancy check (CRC) technique.
Claim 8
Dependent Claim
18 words
The radio communication system receiver of claim 1, wherein the second decoding technique comprises a Bose-Chadhuri-Hocquenghen (BCH) technique.
Claim 9
Dependent Claim
30 words
The radio communication system receiver of claim 1, wherein the first decoding technique comprises a cyclic redundancy check (CRC) technique and the second decoding technique comprises a Bose-Chadhuri-Hocquenghen (BCH) technique.
Claim 10
Dependent Claim
20 words
The radio communication system receiver of claim 1, wherein the means for using comprises means for using a predetermined threshold.
Claim 11
Dependent Claim
29 words
The radio communication system receiver of claim 1, wherein the means for using comprises means for using a threshold that is a function of the estimated communication channel characteristic.
Claim 12
Dependent Claim
89 words
A receiver for use in a 16-QAM digital radio communication system, comprising: A) means for demodulating a 16-QAM signal presently received over a communication channel, to produce a presently received demodulated signal; B) means for determining a present bit error rate (BER) value for the communication channel; C) means for decoding received demodulated signals using a first decoding technique; and D) means for using the present BER value to switch from the first decoding technique to a second decoding technique, to thereby decode the presently received a modulated signal.
Claim 13
Dependent Claim
89 words
A receiver for use in a 16-QAM digital radio communication system, comprising: A) means for demodulating a 16-QAM signal presently received over a communication channel, to produce a presently received demodulated signal; B) means for determining a present bit error rate (BER) value for the communication channel; C) means for decoding received demodulated signals using a first decoding technique; and D) means for using the present BER value to switch from the first decoding technique to a second decoding technique, to thereby decode the presently received a modulated signal.
Claim 14
Dependent Claim
20 words
The radio communication system receiver of claim 11, wherein the first decoding technique comprises a cyclic redundancy check (CRC) technique.
Claim 15
Dependent Claim
18 words
The radio communication system receiver of claim 11, wherein the second decoding technique comprises a Bose-Chadhuri-Hocquenghen (BCH) technique.
Claim 16
Dependent Claim
30 words
The radio communication system receiver of claim 11, wherein the first decoding technique comprises a cyclic redundancy check (CRC) technique and the second decoding technique comprises a Bose-Chadhuri-Hocquenghen (BCH) technique.
Claim 17
Dependent Claim
20 words
The radio communication system receiver of claim 11, wherein the means for using comprises means for using a predetermined threshold.
Claim 18
Independent Claim
89 words
A method of recovering data in a radio communication system receiver, the method comprising the steps of: A) demodulating a signal presently received over a communication channel, to produce a presently received demodulated signal; B) estimating a present characteristic of the communication channel to produce a present estimated communication channel characteristic; C) decoding demodulated signals using a first decoding technique; and D) using the present estimated communication channel characteristic to switch from the first decoding technique to a second decoding technique to thereby decode the presently received modulated signal.
Claim 19
Independent Claim
89 words
A method of recovering data in a radio communication system receiver, the method comprising the steps of: A) demodulating a signal presently received over a communication channel, to produce a presently received demodulated signal; B) estimating a present characteristic of the communication channel to produce a present estimated communication channel characteristic; C) decoding demodulated signals using a first decoding technique; and D) using the present estimated communication channel characteristic to switch from the first decoding technique to a second decoding technique to thereby decode the presently received modulated signal.
Claim 20
Dependent Claim
25 words
The method of claim 16, wherein the step of using comprises the step of comparing the present estimated communication channel characteristic with a predetermined threshold.
Claim 21
Dependent Claim
35 words
The method of claim 16, wherein the step of using comprises the step of comparing the present estimated communication channel characteristic with a threshold that is a function of the present estimated communication channel characteristic.
Claim 22
Dependent Claim
43 words
The method of claim 16, wherein the step of using comprises the step of comparing the present estimated communication channel characteristic with a threshold that is based, at least in part, on channel state information other than the present estimated communication channel characteristic.
Claim 23
Dependent Claim
28 words
The method of claim 16, further comprising the step of providing an error detection signal that is usable to facilitate error mitigation on the presently received demodulated signal.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 7.5 Years (Year 8) | 2002-07-03 | 2003-01-02 | 2003-07-04 | $3760.00 | Window Closed / Lapsed |
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