Method and system for channel estimation in a single channel (SC) multiple-input multiple-output (MIMO) system comprising two-transmit (2-Tx) and multiple-receive (M-Rx) antennas for WCDMA/HSDPA
View Patent ↗In a wireless system, a method and system for channel estimation in a single channel MIMO system comprising two-transmit and multiple-receive antennas for WCDMA/HSDPA are provided. A first receive antenna and at least one additional receive antenna may receive a plurality of SC communication signals transmitted from a first and an additional transmit antennas. Estimates of the propagation channels between transmit and receive antennas may be performed concurrently and may be determined from a baseband combined channel estimate. The integration time may be based on channel estimation accuracy and wireless modem performance. The signals received in the additional receive antennas may be multiplied by a rotation waveform to achieve channel orthogonality. The rotation waveform's amplitude and phase components may be modified based on the channel estimates. Rotation of the received signals in the additional receive antennas may be continuous or periodic.
1. A method for communication, the method comprising:
generating a plurality of channel estimates for a plurality of received single channel communication signals based on a first baseband combined channel estimate and a second baseband combined channel estimate;
determining based on said plurality of channel estimates, a plurality of channel weights to be utilized for modifying a rotation waveform; and
modifying based on said determined plurality of channel weights, said plurality of received single channel communication signals to achieve channel orthogonality.
2. The method according to claim 1 , comprising receiving said plurality of single channel communication signals by utilizing a first antenna and one or more other antennas.
3. The method according to claim 1 , wherein said modifying comprises modifying said plurality of said received single channel communication signals based on said modified rotation waveform.
4. The method according to claim 1 , wherein said modifying comprises multiplying said plurality of said received single channel communication signals by said rotation waveform.
5. The method according to claim 4 , comprising combining said plurality of said received single channel communication signals that are received utilizing a first antenna and said multiplied plurality of said received single channel communication signals that are received utilizing one or more other antennas.
6. The method according to claim 1 , comprising determining at least a first channel estimate of said plurality of channel estimates by integrating said first baseband combined channel estimate and said second baseband combined channel estimate over a 360-degree rotation period.
7. The method according to claim 1 , comprising multiplying said first baseband combined channel estimate and said second baseband combined channel estimate by a complex conjugate of said rotation waveform.
8. The method according to claim 7 , comprising determining at least a second channel estimate of said plurality of channel estimates by integrating said multiplied first baseband combined channel estimate and said multiplied second baseband combined channel estimate over a 360-degree rotation period.
9. The method according to claim 1 , wherein said plurality of channel weights include a phase component and an amplitude component.
10. The method according to claim 9 , wherein said phase component and said amplitude component result in a maximum signal-to-interference-and-noise ratio (SINR).
11. The method according to claim 1 , further comprising determining a plurality of channel weight factors based on said plurality of channel estimates.
12. A system for communication, the system comprising:
one or more circuits that are configured to:
generate a plurality of channel estimates for a plurality of received single channel communication signals based on a first baseband combined channel estimate and a second baseband combined channel estimate;
determine based on said plurality of channel estimates, a plurality of channel weights to be utilized for modifying a rotation waveform; and
modify based on said determined plurality of channel weights, said plurality of received single channel communication signals to achieve channel orthogonality.
13. The system according to claim 12 , wherein said one or more circuits are configured to receive said plurality of single channel communication signals by utilizing a first antenna and one or more other antennas.
14. The system according to claim 12 , wherein said one or more circuits are configured to modify said plurality of said received single channel communication signals based on said modified rotation waveform.
15. The system according to claim 12 , wherein said one or more circuits are configured to multiply said plurality of said received single channel communication signals by said rotation waveform.
16. The system according to claim 15 , wherein said one or more circuits are configured to combine said plurality of said received single channel communication signals that are received utilizing a first antenna and said multiplied plurality of said received single channel communication signals that are received utilizing one or more other antennas.
17. The system according to claim 12 , wherein said one or more circuits are configured to determine at least a first channel estimate of said plurality of channel estimates by integrating said first baseband combined channel estimate and said second baseband combined channel estimate over a 360-degree rotation period.
18. The system according to claim 12 , wherein said one or more circuits are configured to multiply said first baseband combined channel estimate and said second baseband combined channel estimate by a complex conjugate of said rotation waveform.
19. The system according to claim 18 , wherein said one or more circuits are configured to determine at least a second channel estimate of said plurality of channel estimates by integrating said multiplied first baseband combined channel estimate and said multiplied second baseband combined channel estimate over a 360-degree rotation period.
20. A machine-readable storage having stored thereon, a computer program having at least one code section for communication, the at least one code section being executable by a machine for causing the machine to perform steps comprising:
generating a plurality of channel estimates for a plurality of received single channel communication signals based on a first baseband combined channel estimate and a second baseband combined channel estimate;
determining based on said plurality of channel estimates, a plurality of channel weights to be utilized for modifying a rotation waveform; and
modifying based on said determined plurality of channel weights, said plurality of received single channel communication signals to achieve channel orthogonality.
21. The machine-readable storage according to claim 20 , wherein said at least one code section comprises code for receiving said plurality of single channel communication signals by utilizing a first antenna and one or more other antennas.
22. The machine-readable storage according to claim 20 , wherein said modifying comprises modifying said plurality of said received single channel communication signals based on said modified rotation waveform.
23. The machine-readable storage according to claim 20 , wherein said modifying comprises multiplying said plurality of said received single channel communication signals by said rotation waveform.
24. The machine-readable storage according to claim 23 , wherein said at least one code section comprises code for combining said plurality of said received single channel communication signals that are received utilizing a first antenna and said multiplied plurality of said received single channel communication signals that are received utilizing one or more other antennas.
25. The machine-readable storage according to claim 20 , wherein said at least one code section comprises code for determining at least a first channel estimate of said plurality of channel estimates by integrating said first baseband combined channel estimate and said second baseband combined channel estimate over a 360-degree rotation period.
26. The machine-readable storage according to claim 20 , wherein said at least one code section comprises code for multiplying said first baseband combined channel estimate and said second baseband combined channel estimate by a complex conjugate of said rotation waveform.
27. The machine-readable storage according to claim 26 , wherein said at least one code section comprises code for determining at least a second channel estimate of said plurality of channel estimates by integrating said multiplied first baseband combined channel estimate and said multiplied second baseband combined channel estimate over a 360-degree rotation period.