存在反馈周期和反馈时延的自适应调制MIMO系统
doi: 10.3724/SP.J.1146.2005.00886
Adaptive Modulation for MIMO Systems with Channel State Information Feedback Periods and Delays
-
摘要: 该文研究了反馈信道信息存在的反馈周期和时延对自适应调制MIMO系统的影响，分析了基于奇异值分解的等效并行衰落信道特性，并且给出了接收机的检测方法和一种简化的检测顺序。研究表明，等效并行衰落信道在一定的时间间隔内具有较大的相关性；接收机采用迫零和干扰消除方法可明显提高系统性能。
-
关键词:
- MIMO;自适应调制;反馈;分配算法
Abstract: This paper investigates the impact of feedback period and delay on the performance of Multiple-Input Multiple-Output (MIMO) systems with adaptive modulation, and analyzes the characteristics of the equivalent parallel fading subchannels obtained by Singular Value Decomposition (SVD). Its receiver detection method and a simplified detection order are given as well. The results show that the correlation of the subchannels fading remains large within a certain period of time. System's performance can be improved significantly when the Zero Forcing (ZF) and Interference Cancellation (IC) techniques are adopted at the receiver. -
[1] Wolniansky W, Foschini G J, and Golden G D, et al.. V-BLAST: an architecture for realizing very high data rates over the rich-scattering wireless channel. Conference Proceedings of Pisa, Italy, 1998: 295-300. [2] Catreux S, Erceg V, and Gesbert D, et al.. Adaptive modulation and MIMO coding for broadband wireless data networks. IEEE Communications Magazine, 2002, 40(6): 108-115. [3] Zhou S L and Giannakis G B. Optimal transmitter eigen-beamforming and space-time block coding based on channel mean feedback[J].IEEE Trans. on Signal Processing.2002, 50(10):2599-2613 [4] Telatar I E. Capacity of multi-antenna Gaussian channels. ATT-Bell Laboratories Technical Memorandum, NJ, US, Murray Hill, 1995. [5] Gritsch G and Weinrichter H. Adaptive subspace modulation in spatially correlated MIMO systems[J].The 13th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, Lisbon, Portugal.2002, 4:1772-1776 [6] Wyglinski A M, Labeau F, and Kabal P. An efficient bit allocation algorithm for multicarrier modulation. 2004 IEEE Wireless Communications and Networking Conference, Atlanta, GA, USA, 2004, 2: 1194-1199. [7] 杨大成等. 移动传播环境. 北京: 机械工业出版社, 2003: 160-163. -
计量
- 文章访问数: 3052
- HTML全文浏览量: 110
- PDF下载量: 681
- 被引次数: 0
下载:
