Frequency selective transmit signal weighting for multiple antenna communication systems
View Patent ↗A method for communication includes performing by one or more processors and/or circuits in a communication device functions including determining transmit power weights, which are to be utilized for communicating one or more wireless signals via a wireless channel, as a function of frequency of a wireless signal communicated via the wireless channel. The determining may be based on a transmission mode of the wireless signal and a state of the wireless communication channel. Transmit antenna spatial weights may be determined for communicating the one or more wireless signals via a plurality of antennas. The one or more wireless signals may be weighted with the transmit power weights and/or one of the transmit antenna spatial weights. The weighted one or more wireless signals may be transmitted via one of a plurality of antennas in accordance with the transmission mode.
1. A method for communication in a user equipment, comprising:
determining, by said user equipment, transmit power weights, which are to be utilized for communicating one or more wireless signals via a wireless channel, as a function of frequency of a wireless signal communicated via said wireless channel, based on a transmission mode of said wireless signal and a state of said wireless channel;
determining, by said user equipment, transmit antenna spatial weights for communicating said one or more wireless signals via a plurality of antennas;
weighting, by said user equipment, said one or more wireless signals with a joint optimization of said transmit power weights and one of said transmit antenna spatial weights; and
transmitting, by said user equipment, via one of said plurality of antennas said weighted one or more wireless signals in accordance with said transmission mode.
2. The method according to claim 1 , further comprising acquiring information indicative of said state of said wireless channel when said wireless signal is transmitted over said wireless channel.
3. The method according to claim 1 , further comprising acquiring information indicative of said transmission mode of said wireless signal when said wireless signal is transmitted over said wireless channel.
4. The method according to claim 1 , wherein said determined transmit power weights of any frequency of said weighted one or more signals are upper-bounded by a threshold.
5. The method according to claim 1 , wherein said joint optimization takes place using a global search.
6. The method according to claim 1 , wherein said weighting of said one or more signals takes place during one or both of baseband signal processing and/or RF signal processing.
7. The method according to claim 1 , further comprising determining said transmit power weights based at least in part on reducing power of at least a portion of frequencies of said one or more wireless signals that correspond to frequencies of said wireless signal with a signal-to-noise ratio (SNR) above a threshold.
8. The method according to claim 1 , further comprising determining said transmit power weights based at least in part on increasing power of at least a portion of frequencies of said one or more wireless signals that correspond to frequencies of said wireless signal with a signal-to-noise ratio (SNR) below a threshold.
9. The method according to claim 1 , wherein said one or more wireless signals comprise at least one of a single carrier signal, a GSM signal, a multi-carrier signal, a code division multiple access (CDMA) signal, an ultra-wideband signal, and/or an orthogonal frequency division multiplexed (OFDM) signal.
10. The method according to claim 1 , wherein said transmit power weights comprise at least one scalar value.
11. The method according to claim 1 , further comprising jointly optimizing at least one performance measure based on said weighting of said one or more wireless signals.
12. The method according to claim 11 , wherein said performance measure comprises one or both of an output signal-to-noise ratio (SNR) and/or an output packet error rate (PER).
13. A user equipment for communication, comprising:
one or more processors and/or circuits configured to:
determine transmit power weights, which are to be utilized for communicating one or more wireless signals via a wireless channel, as a function of frequency of a wireless signal communicated via said wireless channel, based on a transmission mode of said wireless signal and a state of said wireless channel;
determine transmit antenna spatial weights for communicating said one or more wireless signals via a plurality of antennas;
weight said one or more wireless signals with a joint optimization of said transmit power weights and one of said transmit antenna spatial weights; and
transmit via one of said plurality of antennas said weighted one or more wireless signals in accordance with said transmission mode.
14. The user equipment according to claim 13 , wherein said one or more processors and/or circuits are further configured to acquire information indicative of said state of said wireless communication channel when said wireless signal is transmitted over said wireless channel.
15. The user equipment according to claim 13 , wherein said one or more processors and/or circuits are further configured to acquire information indicative of said transmission mode of said wireless signal when said wireless signal is transmitted over said wireless channel.
16. The user equipment according to claim 13 , wherein said determined transmit power weights of any frequency of said weighted one or more signals are upper-bounded by a threshold.
17. The user equipment according to claim 13 , wherein said joint optimization takes place using a global search.
18. The user equipment according to claim 13 , wherein said weighting of said one or more signals takes place during one or both of baseband signal processing and/or RF signal processing.
19. The user equipment according to claim 13 , wherein said one or more processors and/or circuits are further configured to determine said transmit power weights based at least in part on reducing power of at least a portion of frequencies of said one or more wireless signals that correspond to frequencies of said wireless signal with a signal-to-noise ratio (SNR) above a threshold.
20. The user equipment according to claim 13 , wherein said one or more processors and/or circuits are further configured to determine said transmit power weights based at least in part on increasing power of at least a portion of frequencies of said one or more wireless signals that correspond to frequencies of said wireless signal with a signal-to-noise ratio (SNR) below a threshold.
21. The user equipment according to claim 13 , wherein said one or more wireless signals comprise at least one of a single carrier signal, a GSM signal, a multi-carrier signal, a code division multiple access (CDMA) signal, an ultra wideband signal, and/or an orthogonal frequency division multiplexed (OFDM) signal.
22. The user equipment according to claim 13 , wherein said transmit power weights comprise at least one scalar value.
23. The user equipment according to claim 13 , wherein said one or more processors and/or circuits are further configured to jointly optimize at least one performance measure based on said weighting of said one or more wireless signals.
24. The user equipment according to claim 23 , wherein said performance measure comprises one or both of an output signal-to-noise ratio (SNR) and/or an output packet error rate (PER).