OFDM闭环发射分集结合自适应功率分配

李卫; 张小频; 张民; 叶培大

doi:10.3724/SP.J.1146.2006.00030

OFDM闭环发射分集结合自适应功率分配

doi: 10.3724/SP.J.1146.2006.00030

计量
- 文章访问数: 4541
- HTML全文浏览量: 72
- PDF下载量: 1566
- 被引次数: 7
出版历程
- 收稿日期: 2006-01-09
- 修回日期: 2006-12-11
- 刊出日期: 2007-07-19

OFDM Closed-Loop Transmit Diversity Combined with Adaptive Power Allocation

摘要

摘要: 将自适应功率分配技术应用于多发送多接收天线正交频分复用(MIMO-OFDM)系统，如何在载波和天线间分配能量是个关键问题。该文提出：对不同发射天线的各个子载波采用闭环发射分集方案；接着再进行载波间的功率分配，该算法的目标是使误码率最小。文中用数学方法证明了此方案是使总误码率最小的最佳方案。仿真结果显示：在误码率取0.1%时，对于两根发射天线一根接收天线4个子载波的OFDM系统，与传统的将开环发射分集与OFDM相结合的算法相比，此算法能带来6.5dB的增益。
- 发射分集;正交频分复用;功率分配
Abstract: How to allocate power to antennas and carriers is a key problem when adaptive power allocation method is used to multi-antenna and multi-carriers Orthogonal Frequency Division Multiplexing (MIMO-OFDM) system. In this paper, a novel algorithm for allocation of power is proposed. The algorithm firstly combines OFDM with closed-loop transmit diversity technique, then allocates the power to carriers to minimize the Bit Error Rate (BER). This algorithm has the optimum performance which has been proved by mathematical method. To the two transmitted antennas and one received antenna system when the number of OFDM subcarriers are equal to 4, simulation results show that there is 6.5dB gain by comparing with the traditional OFDM-STBC method at the BER of 0.1%.

HTML全文

参考文献(1)

Alamuti S M. A simple transmit diversity technique for wireless communications [J].IEEE Journal on Selected. Areas in Commun.1998, 16(8):1451-1458[2]Lee K F and Williams D B. A space time coded transmitter diversity technique for frequency selective fading channels[C]. IEEE Sensor Array and Multichannel Signal Processing, Workshop, Cambridge MA, 2000: 149-152.[3]Liu A, Xin Y, and Giannakis G B. Space time frequency coded OFDM over frequency selective fading channels [J].IEEE Trans. on Signal Processing.2002, 50(10):2465-2476[4]Hochwald B, Marzetta T L, and Papadias C B. A transmitter diversity scheme for wideband CDMA systems based on space-time spreading, IEEE Journal on Selected Areas in Commun., 2001, 19(1): 48-60.[5]苏彦兵，谈振辉. 开环和闭环发射分集的性能分析[J]. 重庆邮电学院学报, 2003, 15(1): 10-14. Su Yan-bing, Tan Zhen-hui, Performance analysis of open-loop and closed-loop transmit diversity[J]. Journal of Chongqing University of Posts and Telecommunications, 2003, 15(1): 10-14.[6]Park Chang Soon and Lee Kwang Bok. Transmit power allocation for BER performance improvement in multicarrier systems[J].IEEE Transactions on Communications.2004, 52(10):1658-1663[7]Zheng Kan, Huang Lin, and Wang Wen Bo. Improved power allocation schemes based on STBC-OFDM in frequency selective fading channel, In Prof. Communication Technology Proceedings[C], Beijing, 9-11, April, 2003, vol.2: 1042-1045.[8]姜海宁等. 用于宽带无线通信的空时频编码OFDM技术[J]. 上海交通大学学报，2004，38(11): 1792-1795. Jiang Hai-ning, et al.. Space-time-frequency coded OFDM technique for broadband wireless communications [J] Jouranal of Shanghai Jiaotong University, 2004, 38(11): 1792-1795.

施引文献

期刊类型引用(3)

1.	张作宇，廖守亿，孙大为，张合新，王仕成. 稀疏差异先验信息支持的高光谱图像稀疏解混算法. 测绘学报. 2020(08): 1032-1041 . 百度学术
2.	袁博. 基于混合像元空间与谱间相关性模型的NMF线性盲解混. 测绘学报. 2019(09): 1151-1160 . 百度学术
3.	袁博. 空间与谱间相关性分析的NMF高光谱解混. 遥感学报. 2018(02): 265-276 . 百度学术