Interference-Weighted Channel Sounding for Cellular SDMA-TDD Systems

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Executive Summary

In future Time Division Duplex (TDD) wireless systems, where channel reciprocity is maintained, UpLink (UL) channel sounding method is considered as one of the most promising feedback methods due to its bandwidth and delay efficiency. Conventional channel sounding only conveys the Channel State Information (CSI) of each active user to the Base Station (BS). Due to the limitation in system performance because of Co-Channel Interference (CCI) from adjacent cells in interference limited scenarios, CSI is only a suboptimal metric for multiuser spatial multiplexing optimization. Interference-Weighted Channel Sounding (IWCS) is a spectrally efficient feedback technique that provides the Base Station (BS) with implicit knowledge about the interference experienced by each active user.

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