摘要
针对多输入多输出正交频分复用(MIMO-OFDM)系统提出了一种自适应迭代的调制方案。考虑实际通信系统的要求,在通信上层传输速率和误码率要求一定的情况下,以最小化发射功率为目标,在发射端采用自适应迭代的方法给每个空间子信道分配传输比特、发射功率。在满足用户要求的同时,获得了好的频谱效率,节省了发射功率。并且,采用迭代的方法解决了因发射比特必须取整引起的误差。相比与同类算法,可大大降低计算复杂度。计算机仿真表明提出的方法可以用低的发射功率达到用户要求。
The adaptive iterative modulation was proposed for multiple-input-multiple-output-orthogonal frequency division multiplexed (MIMO-OFDM) system. An adaptive minimum transmit power modulation scheme under constant data rate and fixed bit error rate (BER) for the MIMO-OFDM system was proposed to adjust the modulation order and allocates the transmit power to each spatial sub-channel by iterative method considering the requirement of the practical communication system. It can meet the user's requirements and get better freguency efficiency at the cost of minimum transmission power. And it can avoid the error by round the modulation order. Computer simulation results present the efficiency of the proposed scheme.
出处
《通信学报》
EI
CSCD
北大核心
2007年第11期65-70,共6页
Journal on Communications
基金
国家自然科学基金资助项目(60772100)
上海市重大科技攻关项目(06DZ15013)~~
关键词
多输入多输出
正交频分复用
自适应迭代
调制
multiple-input-multiple-output
orthogonal frequency division multiplexed
adaptive iteration
modulation