无需信道估计的一种简单的差分分集OFDM传输方式

吕浚哲; 张海林; 刘增基

无需信道估计的一种简单的差分分集OFDM传输方式

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出版历程
- 收稿日期: 2002-10-22
- 修回日期: 2003-04-30
- 刊出日期: 2004-04-19

A Simple Differential Modulation Diversity in the Presence of Unknown Multipath

摘要

摘要: 空时码在近几年得到了普遍关注,但空时码的应用通常都假定信道具有非频率选择性衰落特性,同时还假定信道状态也是已知的,这些都极大地限制了空时码的应用。该文给出了一种未知频率选择性衰落信道下的差分分集调制方法。应用正交频分复用技术的基本原理,把一个频率选择性衰落信道转换成了多个并行平坦衰落信道。在此基础上,给出了一种无需信道估计的简单的时空频分集结构.仿真结果表明,这种结构在频率选择性衰落信道中无需信道估计就能得到很好的结果.
- 正交频分复用; 差分; 分集; 时空编码
Abstract: Recent years, space-time coding technique is gotten more attention. However, the space-time coding application is often under non-frequeucy-selective channel while the channel knowledge is known. All of these constrains the application of space-time coding. This paper presents a differential modulation diversity used in the presence of unknown multi-path. The proposed technique utilizes orthogonal frequency division multiplexing (OFDM) transforming a frequency selective fading channel into multiple flat fading sub-channels. Based on this, a space-time-frequency configuration applied in unknown frequency selective fading channel is given. And this method is verified by the simulation results.

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Alamouti S M. A simple transmit diversity technique for wireless communications[J].IEEE J. on Select. Areas Comm.1998, 16(8):1451-1458[2]Naguib A F, Seshadri N, Calderbank R. Space-time coding and signal processing for high data rate wireless communications[J].IEEE Signal Processing Mag.2000, 17(3):76-92[3]Tarokh V, Seshadri N, Calderbank A R. Space-time codes for high data rate wireless communication: Performance analysis and code construction[J].IEEE Trans. on Info. Theory.1998, 44(2):744-765[4]Zou W Y, Wu Y. COFDM: an overview[J].IEEE Trans. on Broadcasting.1995, 41(1):1-8[5]Bingham J A C. Multicarrier modulation for data transmission: an idea whose time has come[J].IEEE Comm. Magazine.1990, 28(5):5-14[6]Agrawal D, Tarokh V, Naguib A, Seshadri N. Space-time coded OFDM. for high data rate wireless communication over wideband channels. Proc. 48th IEEE Vehicular Technology Conf., Ottawa,Canada, Mar. 1998: 2232-2236.[7]Mudulodu S, Paulraj A. A transmit diversity scheme for frequency-selective fading channels.IEEE Global Telecommunications Conference, Feb. 2000: 1089-1093.[8]Girish Ganesan, Petre Stoica. Differential modulation using space-time block codes[J].IEEE Signal Processing Letters.2002, 9(2):57-60[9]Cimini Jr. L J. Analysis and simulation of a digital mobile channel using orthogonal frequency division multiplexing. IEEE Trans. on Comm., 1985, COM-33(7): 665-675.[10]吕浚哲,张海林,何非,刘增基.无保护间隔的OFDM信道自适应均衡的一种新算法.电子学报,2002,30(7):941-944.[11]Ganesan G, Stoica P. Space-time diversity using orthogonal and amicable orthogonal designs.in Proc. Int. Conf. Acoustics, Speech, Signal Processing (ICASSP), Istanbul, Turkey, 2000:335-338.Lee K F, Williams D B. A space-time coded transmitter diversity technique for frequency selective fading channels. in Proc. IEEE Sensor Array and Multichannel Signal Processing Workshop,Cambridge, MA, March 2000: 149-152.

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