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| Minimum BER Bit Allocations for MIMO Spatial Multiplexing Systems |
| Che Xiao-lin①; He Chen①; Jiang Ling-ge①; Xiong Yong② |
| ①Department of Electronic Engineering, Shanghai Jiaotong University, Shanghai 200240, China; ②Shanghai Research Center for Wireless Communications, Shanghai 200050, China |
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Abstract Based on the minimum Bit Error Rate (BER) criterion, a greedy bit allocation algorithm and bisection-method based bit allocation algorithm are proposed for Multiple-Input Multiple-Output (MIMO) spatial multiplexing systems. Under the constraint of total bit rate and equal power allocation to each transmit antenna, the proposed transmit bit allocation algorithms can achieve better performance by optimizing the modulation order of each transmit antenna. The simulation results show that the proposed system can obtain significant Signal-to-Noise Ratio (SNR) gain relative to the conventional MIMO system. In addition, compared with the transmit power allocation scheme, the requirements on the dynamic range of the power amplifiers for each transmit antenna are reduced with little performance loss.
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Received: 15 October 2006
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2008, Vol. 30 
