Blind-adaptive decoding of radio signals

Patent metadata

Field	Value
Publication number	US-2018331732-A1
Application number	US-201815970236-A
Country	US
Kind code	A1
Filing date	May 3, 2018
Priority date	May 14, 2002
Publication date	Nov 15, 2018
Grant date	—

Abstract

In a radio receiver, digital baseband signals are processed by a time-domain-to-frequency-domain converter to generate frequency-domain symbols. A blind-adaptive decoder processes the frequency-domain symbols to produce estimates of transmitted data symbols. Frequency-domain equalization may be performed prior to the blind-adaptive decoder performing at least one of blind-adaptive decoding and partially blind adaptive decoding based on information about the transmitted data symbols. The blind-adaptive decoder comprises a combiner that combines the frequency-domain symbols to produce the estimates of the transmitted data symbols.

First claim

1 . An apparatus, comprising:
a radio receiver configured to convert received radio signals to digital baseband signals; a time-domain-to-frequency-domain converter configured to convert the digital baseband signals to a plurality of frequency-domain symbols; and a blind-adaptive decoder configured to decode the plurality of frequency-domain symbols to produce estimates of transmitted data symbols.

2 . The apparatus of claim 1 , wherein the blind-adaptive decoder performs at least one of blind-adaptive decoding and partially blind adaptive decoding based on information about the transmitted data symbols.

3 . The apparatus of claim 2 , wherein the information includes a message symbol constellation.

4 . The apparatus of claim 1 , wherein the blind-adaptive decoder is configured to perform at least one of constant-modulus, multiple-modulus, and decision-direction processing.

5 . The apparatus of claim 1 , wherein the blind-adaptive decoder is configured to perform at least one of dominant-mode prediction and code-gated self-coherence restoral.

6 . The apparatus of claim 1 , wherein the blind-adaptive decoder comprises a combiner configured to combine the plurality of frequency-domain symbols to produce the estimates of the transmitted data symbols.

7 . The apparatus of claim 6 , wherein the combiner is configured to perform at least one of orthogonality restoring combining, equal gain combining, minimum mean squared error combining, and maximum likelihood processing.

8 . The apparatus of claim 1 , further comprising an equalizer configured to operate on the plurality of frequency-domain symbols.

9 . A method, comprising:
converting received radio signals to digital baseband signals; performing a time-domain-to-frequency-domain conversion of the digital baseband signals to generate a plurality of frequency-domain symbols; and performing blind-adaptive decoding of the plurality of frequency-domain symbols to produce estimates of transmitted data symbols.

10 . The method of claim 9 , wherein the blind-adaptive decoding comprises a combination of blind-adaptive decoding and partially blind adaptive decoding based on information about the transmitted data symbols.

11 . The method of claim 10 , wherein the information includes a message symbol constellation.

12 . The method of claim 9 , wherein the blind-adaptive decoding comprises performing at least one of constant-modulus, multiple-modulus, and decision-direction processing.

13 . The method of claim 9 , wherein the blind-adaptive decoding comprises performing at least one of dominant-mode prediction and code-gated self-coherence restoral.

14 . The method of claim 9 , wherein the blind-adaptive decoding comprises combining the plurality of frequency-domain symbols to produce the estimates of the transmitted data symbols.

15 . The method of claim 14 , wherein the combining comprises at least one of orthogonality restoring combining, equal gain combining, minimum mean squared error combining, and maximum likelihood processing.

16 . The method of claim 9 , further comprising equalizing the plurality of frequency-domain symbols.

17 . A radio receiver comprising at least one processor, memory in electronic communication with the processor, and instructions stored in the memory, the instructions executable by the at least one processor to:
perform a time-domain-to-frequency-domain conversion of digital baseband signals generated from received radio signals in order to generate a plurality of frequency-domain symbols; and perform blind-adaptive decoding of the plurality of frequency-domain symbols to produce estimates of transmitted data symbols.

18 . The radio receiver of claim 17 , wherein the blind-adaptive decoding is based on information about the transmitted data symbols.

19 . The radio receiver of claim 18 , wherein the information includes a message symbol constellation.

20 . The radio receiver of claim 17 , wherein the blind-adaptive decoding comprises at least one of constant-modulus, multiple-modulus, and decision-direction processing.

21 . The radio receiver of claim 17 , wherein the blind-adaptive decoding comprises at least one of dominant-mode prediction and code-gated self-coherence restoral.

22 . The radio receiver of claim 17 , wherein the blind-adaptive decoding comprises combining the plurality of frequency-domain symbols to produce the estimates of the transmitted data symbols.

23 . The radio receiver of claim 22 , wherein the combining comprises at least one of orthogonality restoring combining, equal gain combining, minimum mean squared error combining, and maximum likelihood processing.

24 . The radio receiver of claim 17 , further comprising instructions stored in the memory and executable by the at least one processor to equalize the plurality of frequency-domain symbols.

Assignees

• Genghiscomm Holdings Llc

Inventors

• Shattil Steve J

Classifications

• H04B7/0456

  Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting · CPC title

• H04L27/265

  Fourier transform demodulators, e.g. fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators (H04L27/26524 takes precedence) · CPC title

• H04L27/2647

  Arrangements specific to the receiver only (equalisation H04L27/01) · CPC title

• H04L27/2636

  with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM] · CPC title

• H04B1/0003

  Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain (digital baseband systems H04L25/00; digital modulation/demodulation H04L27/00; CDMA H04B1/707; TDMA H04B7/2643; image transmission H04N5/00) · CPC title