|
|
论文:2012,Vol:30,Issue(5):636-639 |
|
|
引用本文： |
|
|
包涛, 林华杰, 李毅, 徐瑞萍. 基于MIMO-OFDM系统的改进型空时频编码算法[J]. 西北工业大学 |
|
|
Bao Tao, Lin Huajie, Li Yi, Xu Ruiping. An Improved Algorithm of Space-Time-Frequency (STF) Codes Based on A MIMO-OFDM System[J]. Northwestern polytechnical university |
|
|
|
|
|
|
|
| 基于MIMO-OFDM系统的改进型空时频编码算法 |
|
| 包涛, 林华杰, 李毅, 徐瑞萍 |
|
| 西北工业大学 电子信息学院, 陕西 西安 710072 |
| 摘要: |
| 在宽带无线通信中,与信道延迟扩展相比符号周期变得越来越小,此时发射信号要经历频率选择性衰落。通过结合空时编码与宽带正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)技术,提出了一种能够同时获得时间、空间和频率分集增益的分组正交空时频编码方法。该方法采用新的映射规则,降低了OFDM子载波之间的相关性。与已有的空时频编码方案相比,可获得更大的分集增益,改善了系统的误比特率性能,且并未导致系统的复杂度增加。 |
| 关键词:
信道编码
空时频码
正交
分集
|
|
| An Improved Algorithm of Space-Time-Frequency (STF) Codes Based on A MIMO-OFDM System |
|
| Bao Tao, Lin Huajie, Li Yi, Xu Ruiping |
|
| Department of Electronics Engineering,Northwestern Polytechnical University,Xi'an 710072,China |
| Abstract: |
| Sections 1 and 2 of the full paper explain our algorithm mentioned in the title, which we believe is betterthan existing ones and whose core consists of: (1) if the symbol period becomes shorter compared with delay ex-pansion of the channel in the broadband wireless communication systems, the transmitted signals will lead to fre-quency selective fading; by combination of space-time codes with orthogonal frequency division multiplexing(OFDM), we propose an encoding method of orthogonal space-time-frequency block codes which can simultaneous-ly obtain space, time and frequency diversity gains; (2) aiming at de-correlation of the subcarriers of OFDM, weapply a new mapping rule.Fig.2 gives simulation results, which, compared with the test data of existing schemesof space-time-frequency (STF) codes, show preliminarily that our scheme can indeed maximize diversity gains andachieve optimal system bit error rate (BER) performance with a moderate decoding complexity. |
| Key words:
algorithms
bit error rate
codes (symbols)
computer simulation
decoding
fading channels
Monte Carlo methods
orthogonal frequency division multiplexing
random processes
wireless telecommuni-cation systems;de-correlation
diversity
mapping rule
|
|
| 收稿日期: 2011-11-20
修回日期:
|
| DOI: |
| 基金项目: 西北工业大学基础研究基金(JC20120206)资助 |
| 通讯作者:
Email： |
| 作者简介: 包涛(1983-)，女，西北工业大学工程师，主要从事无线通信、信息与编码技术的研究。
|
|
| 相关功能 |
|
|
|
|
| 作者相关文章 |
|
| 包涛 在本刊中的所有文章 |
| 林华杰 在本刊中的所有文章 |
| 李毅 在本刊中的所有文章 |
| 徐瑞萍 在本刊中的所有文章 |
|
|
|
|
|
|
|
|
参考文献: |
|
|
[1] Boelcskei H.MIMO-OFDM Wireless Systems: Basics,Perspectives and Challenges.IEEE Wireless Cmmunications,2006,13(4): 31-37
[2] Kim J.Interference Suppression for High Data Rate STBC/SFBC with 1-bit Feedback.IEEE Communications Letters,2009,13(1): 13-15
[3] Liu Z Q,Xin Y,Giannakis G B.Space-Time-Frequency Coded OFDM over Frequency-Selective Fading Channels.IEEE Transon Signal Processing,2002,50(10): 2465-2476
[4] Larsson E G,Stoica P.Space-Time Block Coding for Wireless Communications.Comberidge Uinversity Press,2003,136-153
[5] Joo P,Kang D.Analysis of STFBC-OFDM for BWA in SUI Channel.IEEE C802.16a-02/18,2001
[6] Lee K,Kim Y,Kang J.A Novel Orthogonal Space-Time-Frequency Block Code for OFDM Systems.IEEE Communications Let-ters,2009,13(9): 652-654 |
|
|
|
|
|
|
|
