[show abstract][hide abstract] ABSTRACT: The use of multiple antennas for diversity and array gain may require accurate channel state information (CSI) on each subcarrier in orthogonal frequency division multiplexing systems. Such CSI is usually reported from the receiver to the transmitter, causing a significant amount of feedback signaling burden. Recent work can noticeably reduce the feedback signaling burden by exploiting the channel correlation properties in the frequency domain, but it can be applied to the generation of a single beam . In this paper, this idea is extended to the use of multiple beams for spatial multiplexing. Simulation results show that the proposed scheme can improve the performance using the same amount of feedback signaling burden or provide the same performance while noticeably reducing the amount of feedback signaling burden, compared to conventional schemes.
Wireless Conference, 2008. EW 2008. 14th European; 07/2008
[show abstract][hide abstract] ABSTRACT: This paper considers a transmit beamforming scheme that works with reduced feedback information in OFDM based multiple-input single-output (MISO) wireless systems. The proposed scheme generates the beamforming weight using information on the previous beamforming weights and channel correlation, significantly reducing the amount of feedback signaling burden. The feedback signaling overhead can further be reduced with the use of clustering and interpolation techniques. Simulation results show that the proposed scheme outperforms conventional beamforming techniques, while using the same amount of feedback signaling overhead.
Vehicular Technology Conference, 2008. VTC Spring 2008. IEEE; 06/2008