Beamforming multiple-input multiple-output wireless...

Details Beamforming multiple-input multiple-output wireless... Beamforming multiple-input multiple-output wireless...

2011-01-25

2011-01-25

Pham, Chi H. (Department: 2471)

Multiplex communications

Duplex

Communication over free space

C370S282000, C370S334000, C342S372000, C342S377000, C455S562100

Reexamination Certificate

active

07876715

ABSTRACT:
Techniques are provided herein to combine the advantages of beamforming with the advantages of multiple-input multiple output (MIMO) technology in a frequency division duplex (FDD) communication system, even when the uplink and downlink frequency separation exceeds the coherent bandwidth of the over-the-air-channels. At a first wireless communication device having M plurality of antennas, a wireless transmission is received that is sent from a second wireless communication device having P plurality of antennas. The first device computes spatial components associated with the transmission received at the M plurality of antennas. The first device selects the N strongest spatial components among the computed spatial components. The first device computes N beamforming weight vectors based on the N strongest spatial components. The first device then computes N MIMO beamforming weight vectors based on the N beamforming weight vectors. The N MIMO beamforming weight vectors are applied to N signal streams to be transmitted via the plurality of antennas of the first device to the plurality of antennas of the second device.

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Liang et al., “Downlink Beamforming for DS-CDMA Mobile Radio with Multimedia Services,”0 VTC, 1999, pp. 17-21.
Liang et al., “Downing Channel Covariance Matrix (DCCM) Estimation for FDD SDMA,” VTC, 2001, pp. 2382-2386.

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