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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...
For wireless multipath fading channels, the performance of a direct-sequence code-division multiple-access (DS-CDMA) system is degraded by the interferences, including the multipath interference (MPI) and the multiuser interference (MUI). For the downlink DS-CDMA with random spreading, we derive the variances of the interferences and obtain the signal-to-interference-plus-noise ratio (SINR). The simple...
We introduce a new class of code sequences for synchronous CDMA, having in mind application to the downlink of cellular systems. The code that we propose is made by all the cyclical translations of what is called in the literature a CAZAC sequence, for example a Frank-Zadoff sequence. We show that, when the transmission channel is affected by multipath and noise, the proposed code allows multiuser...
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