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A new scheme to generate multiple weights used in opportunistic beamforming (OBF) is proposed to deal with the performance degradation due to the fewer users in the OBF systems. In the proposed scheme, only two mini-slots are employed to create effective channels, while more channel candidates can be obtained via linearly combining the two effective channels, thus increasing the multiuser diversity...
We examine the ergodic capacity of beamforming over a multiple-input single-output (MISO) time-selective channel with channel estimation error and delayed limited feedback. At each frame, the receiver obtains the minimum mean squared error estimation of the channel, chooses a transmit beamforming vector, according to the error channel estimation, from a codebook based on random vector quantization...
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