Method and system for low complexity conjugate gradient based equalization in a wireless system
View Patent ↗Methods and systems for processing signals in a receiver are disclosed herein and may include updating a plurality of filter taps utilizing at least one channel response vector and at least one correlation vector, for a plurality of received clusters, based on initialized values related to the at least one channel response vector and the at least one correlation vector. At least a portion of the received signal clusters may be filtered utilizing at least a portion of the updated plurality of filter taps. The update may be repeated whenever a specified signal-to-noise ratio (SNR) for the received signal clusters is reached. The initialized values may be updated during a plurality of iterations, and the update may be repeated whenever a specified number of the plurality of iterations is reached.
1. A method for processing wireless signals, comprising:
receiving first and second wireless signals comprising information transmitted from one or more transmit antennas;
generating a correlation vector that corresponds to said first wireless signal correlated with a complex conjugate of said second wireless signal; and
updating an equalizer tap according to said correlation vector upon determining that a signal-to-noise ratio (SNR) requirement is satisfied.
2. The method of claim 1 , further comprising generating said equalizer tap according to a channel response vector that corresponds to the combination of a receive antenna and a transmit antenna.
3. The method of claim 1 , wherein said equalizer tap is updated iteratively while the SNR requirement is satisfied.
4. The method of claim 1 , wherein said equalizer tap is updated a pre-determined number of times.
5. The method of claim 1 , further comprising generating a chip-rate synchronously sampled signal based on a chip clocking signal and at least one of said first and second wireless signals.
6. The method of claim 5 , further comprising generating a received signal estimate based on said generated chip-rate synchronously sampled signal.
7. The method of claim 5 , wherein the correlation vector is generated using the chip-rate synchronously sampled signal.
8. The method of claim 1 , wherein said first and second wireless signals comprise a signal cluster.
9. The method of claim 1 , wherein said equalizer tap is updated according to a conjugate gradient based on said correlation vector.
10. The method of claim 1 , wherein said SNR requirement is determined to be satisfied when said SNR falls within a predetermined range.
11. A system for processing wireless signals, comprising:
one or more receive ports configured to receive first and second wireless signals comprising information transmitted from one or more transmit antennas;
a correlator configured to generate a correlation vector that corresponds to said first wireless signal correlated with a complex conjugate of said second wireless signal; and
a conjugate gradiant tap optimizer (CGTO) configured to update an equalizer tap according to said correlation vector upon determining that a signal-to-noise ratio (SNR) requirement is satisfied.
12. The system of claim 11 , wherein said CGTO is configured to generate said equalizer tap according to a channel response vector that corresponds to the combination of a receive antenna and a transmit antenna.
13. The system of claim 11 , wherein said CGTO is configured to update said equalizer tap iteratively while the SNR requirement is satisfied.
14. The system of claim 11 , wherein said CGTO is configured to update said equalizer tap a pre-determined number of times.
15. The system of claim 11 , wherein said correlator is configured to generate a chip-rate synchronously sampled signal based on a chip clocking signal and at least one of said first and second wireless signals.
16. The system of claim 15 , wherein said correlator is configured to generate a received signal estimate based on said generated chip-rate synchronously sampled signal.
17. The system of claim 15 , wherein said correlator is configured to generate said correlation vector using the chip-rate synchronously sampled signal.
18. The system of claim 11 , wherein said first and second wireless signals comprise a signal cluster.
19. The system of claim 11 , wherein said CGTO is configured to update said equalizer tap according to a conjugate gradient based on said correlation vector.
20. The method of claim 11 , wherein said CGTO is configured to determine that said SNR requirement is satisfied when said SNR falls within a predetermined range.