Method and system for processing multipath signals over a single user downlink MIMO channel using a hybrid equalizer/RAKE receiver
View Patent ↗A mobile device comprises multiple receive antennas to receive spatially independent multipath signals from multiple transmit antennas located on a single base station. The mobile device concurrently generates a RAKE-based equivalent single path signal (RAKE ESPS) and an equalizer-based equivalent single path signal (equalizer ESPS) for the multipath signals received via each receive antenna. The generated RAKE ESPS or the generated equalizer ESPS is selected for channel decoding. Reference signal components are extracted from the multipath signals received to determine noise components, which is used to determine signal quality information of the generated RAKE ESPS and the generated equalizer ESPS. A final ESPS is selected from the generated RAKE ESPS and the generated equalizer ESPS based on the corresponding determined signal quality information. The selected final ESPS is diversity processed by combining signal components over the transmit/receive antennas. Transmission parameters are determined for channel decoding the combined signals.
1. A method for processing signals in a communication system, the method comprising:
in a mobile communication device comprising a plurality of receive antennas:
receiving spatially independent multipath signals via said plurality of receive antennas from a plurality of transmit antennas located on a single base station;
concurrently generating a RAKE-based equivalent single path signal and an equalizer-based equivalent single path signal for said spatially independent multipath signals received by each of said plurality of receive antennas;
selecting one of said generated RAKE-based equivalent single path signal and said generated equalizer-based equivalent single path signal with respect to said each of said plurality of receive antennas for channel decoding; and
despreading said selected RAKE-based equivalent single path signal or said selected equalizer-based equivalent single path signal.
2. The method according to claim 1 , further comprising extracting reference signal components from said spatially independent multipath signals received by each of said plurality of receive antennas.
3. The method according to claim 2 , further comprising determining noise components in said spatially independent multipath signals received by each of said plurality of receive antennas using said extracted reference signal components.
4. The method according to claim 3 , further comprising determining signal quality information of said generated RAKE-based equivalent single path signal and said generated equalizer-based equivalent single path signal, respectively, based on said determined noise components.
5. The method according to claim 4 , further comprising selecting said generated RAKE-based equivalent single path signal or said generated equalizer-based equivalent single path signal for channel decoding based on said corresponding determined signal quality information.
6. The method according to claim 5 , further comprising diversity processing said despreaded, selected RAKE-based equivalent single path signal or said despreaded selected equalizer-based equivalent single path signal.
7. The method according to claim 6 , further comprising combining signal components, transmitted from said plurality of transmit antennas located on said single base station, in said despreaded selected RAKE-based equivalent single path signal or said despreaded selected equalizer-based equivalent single path signal.
8. The method according to claim 6 , further comprising combining signal components, received from said plurality of receive antennas on said mobile communication device, in said despreaded selected RAKE-based equivalent single path signal or said despreaded selected equalizer-based equivalent single path signal.
9. The method according to claim 6 , further comprising determining transmission parameters for said diversity processed equivalent single path signal.
10. The method according to claim 9 , further comprising channel decoding said diversity processed equivalent single path signal using said determined transmission parameters.
11. A system for signal processing for use within a mobile communication device comprising a plurality of receive antennas, the system comprising:
a receiver configured to receive spatially independent multipath signals via said plurality of receive antennas from a plurality of transmit antennas located on a single base station; and
a processor and/or circuits configured to:
concurrently generate a RAKE-based equivalent single path signal and an equalizer-based equivalent single path signal for said spatially independent multipath signals received by each of said plurality of receive antennas;
select one of said generated RAKE-based equivalent single path signal and said generated equalizer-based equivalent single path signal with respect to said each of said plurality of receive antennas for channel decoding; and
despread said selected RAKE-based equivalent single path signal or said selected equalizer-based equivalent single path signal.
12. The system according to claim 11 , wherein said processor and/or circuits are further configured to extract reference signal components from said spatially independent multipath signals received by each of said plurality of receive antennas.
13. The system according to claim 12 , wherein said processor and/or circuits are further configured to determine noise components in said spatially independent multipath signals received by each of said plurality of receive antennas using said extracted reference signal components.
14. The system according to claim 13 , wherein said processor and/or circuits are further configured to determine signal quality information of said generated RAKE-based equivalent single path signal and said generated equalizer-based equivalent single path signal, based on said determined noise components.
15. The system according to claim 14 , wherein said processor and/or circuits are further configured to select said generated RAKE-based equivalent single path signal or said generated equalizer-based equivalent single path signal for channel decoding based on said corresponding determined signal quality information.
16. The system according to claim 15 , wherein said processor and/or circuits are further configured to diversity process said despreaded selected RAKE-based equivalent single path signal or said despreaded selected equalizer-based equivalent single path signal.
17. The system according to claim 16 , wherein said processor and/or circuits are further configured to combine signal components, transmitted from said plurality of transmit antennas located on said single base station, in said despreaded selected RAKE based equivalent single path signal or said despreaded selected equalizer-based equivalent single path signal.
18. The system according to claim 16 , wherein said processor and/or circuits are further configured to combine signal components, received from said plurality of receive antennas on said mobile communication device, in said despreaded selected RAKE-based equivalent single path signal or said despreaded selected equalizer-based equivalent single path signal.
19. The system according to claim 16 , wherein said processor and/or circuits are further configured to determine transmission parameters for said diversity processed equivalent single path signal.
20. The system according to claim 19 , wherein said processor and/or circuits are further configured to channel decode said diversity processed equivalent single path signal using said determined transmission parameters.