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| Joint Bit and Power Allocation Algorithms for MIMO-OFDM Systems |
| Xu Wei; Zhao Chun-ming; Gong Xiao-qun; Zhang Li |
| National Mobile Communications Research Lab., Southeast University, Nanjing 210096, China |
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Abstract In this paper, adaptive modulation and power allocation techniques are investigated for MIMO-OFDM systems. A computationally efficient optimal joint bit and power allocation algorithm is proposed. For implementation simplicity, a simplified sub-optimal algorithm exploiting equal power allocation is presented. Simulation results show that the proposed joint allocation algorithm obtains optimal performance with low computational complexity. Moreover, compared with the optimal algorithm using equal power allocation, the presented sub-optimal algorithm reduces the complexity significantly with slight performance degradation.
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Received: 16 February 2006
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2007, Vol. 29 
