MIMO-OFDM系统中的比特和功率联合分配算法
doi: 10.3724/SP.J.1146.2006.00157
Joint Bit and Power Allocation Algorithms for MIMO-OFDM Systems
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摘要: 针对MIMO-OFDM系统，该文首先提出一种实用的最优比特和功率联合分配算法；其次为简化实现，设计了一种简化的等功率自适应调制选择算法。仿真表明，提出的联合分配算法不但可以获得最优的性能，而且具有较低的复杂度。简化的次优等功率分配算法极大地降低了算法复杂度，而性能只略低于最优等功率分配算法。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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