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This paper investigates the optimal bit and power allocation to minimize transmission power under system bit error rate (BER) and transmission rate requirements for multiple-input multiple-output (MIMO) systems with imperfect channel state information (CSI). A robust greedy algorithm is proposed and proved to be the optimal robust bit and power allocation by simulation. Simulation results also show...
This paper proposes an adaptive modulation (AM) algorithm for multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) systems with Vertical Bell Laboratories Layered Space-Time (V-BLAST) and orthogonal-triangular decomposition (QR) detection firstly. Then performance analysis is derived in closed form. Simulation results show that the theoretic bit error rate (BER) and...
This paper puts forward two novel user-grouping algorithms for grouped MC-CDMA systems. The adaptive assignment for user-grouping plays an important role for link quality. We formulate the capacity-maximizing problem of user-grouping and analysis the optimal criterion for it. The derived optimal criterion has a similar form with signal to noise plus interference (SINR), with unassigned power included...
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