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This paper considers the problem of user subset (US) selection for minimizing the bit error rate (BER) of multi-user space-time line code (MU-STLC) multiple-input multiple-output systems with fairness-aware per-user power allocation. The optimal selection criterion suitable for MU-STLC transmissions based on zero forcing (ZF) precoding is given and...
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... consider a downlink MU-STLC time division duplex (TDD) system, which has N T transmit antennas and U users. Each user has two receive antennas for STLC [1]- [6] as shown in Fig. 1. In this work, it is assumed that K (≤U ) users are selected from the U users. Let x k,t be the t-th transmitted symbol of the k-th user, with E[x k,t x * k,t ] = σ 2 x . Then the MU-STLC signal matrix is defined ...
Context 2
... Fig. 5, the BER results of the proposed US selection algorithm are given for (8, 12, 8), (10, 12, 8), (12, 12, 8), and (14,12,8) systems with higher numbers of transmit antennas. It is also found that the proposed algorithms make a substantial performance gain over a (8,8,8) scenario. ...
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