北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 2008, Vol. 31 ›› Issue (5): 53-56.doi: 10.13190/jbupt.200805.53.zhangrr

• 论文 • 上一篇    下一篇

低复杂度的MIMO比特和功率分配方案

张然然, 杨爱敏, 刘思杨, 刘元安   

  1. 北京邮电大学 泛网无线通信教育部重点实验室, 北京 100876
  • 收稿日期:2008-01-19 修回日期:1900-01-01 出版日期:2008-10-30 发布日期:2008-10-30
  • 通讯作者: 张然然

Simplified Adaptive Bit and Power Allocation for MIMO Systems

ZHANG Ran-ran, YANG Ai-min, LIU Si-yang, LIU Yuan-an   

  1. Key Lab of Universal Wireless Communications, Ministry of Education, Beijing University of Posts and Telecommunications,
    Beijing 100876, China
  • Received:2008-01-19 Revised:1900-01-01 Online:2008-10-30 Published:2008-10-30
  • Contact: ZHANG Ran-ran

摘要:

提出了一种低复杂度的自适应比特和功率分配算法,在满足系统信息传输速率和误比特率限制的条件下,利用不精确的信道状态信息使多输入多输出系统的发送功率最小化. 首先利用函数部分单调性将非凸最优化问题转化为凸优化问题,然后得到最优化问题在非负实数域内的闭合最优解,并将其调整成离散比特数,从而获得最终的比特和功率分配结果. 仿真结果表明,该算法可以获得与最优的鲁棒贪婪比特和功率分配算法相同的分配结果和功率效率,而计算复杂度大幅度降低.

关键词: 多输入多输出, 自适应调制, 比特和功率分配, 信道状态信息

Abstract:

A low complexity bit and power allocation algorithm is proposed to minimize the total transmit power under transmission rate and bit error ratio constraints in multiple-input multiple-output systems with inaccurate channel state information. With monotony, the non-convex optimization problem is simplified to a convex one. Then the optimal solution is derived in the nonnegative real field. And the final bit and power allocation is obtained after adjusting the real solution into discrete bit numbers. The simulations show that the proposed algorithm has the same power efficiency with the optimal robust greedy algorithm while its computation complexity is much lower.

Key words: multiple-input multiple-output, adaptive modulation, bit and power allocation, channel state information

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