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This paper considers zero-forcing beamforming (ZFBF) MU-MIMO systems in which one stream is transmitted per user. Assuming no knowledge of other users' channel matrices, user terminals (UT) feedback the effective vector channel (not the full MIMO channel matrix) using channel vector quantization and a channel quality index (CQI) indicating its estimated receive signal-to-noise-ratio (SINR). Limited...
We study pulse-based ultra wideband (UWB) communications over multipath channels using asynchronous spread spectrum (SS) multiple access (MA) based on time-hopping (TH) and pulse position modulated (PPM) signals. More specifically, we analyze the signal-to-interference (SIR) degradation in the presence of additive white Gaussian noise (AWGN), multi-user interference (MUI), and dense multipath effects...
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