LDSTBC+OFDM中的一种新的分层方法

战金龙; 廖桂生; 李勇朝

doi:10.3724/SP.J.1146.2005.00858

LDSTBC+OFDM中的一种新的分层方法

doi: 10.3724/SP.J.1146.2005.00858

基金项目:

国家自然科学基金(60172028)和高等学校博士学科点专项基金(20010701008)资助课题

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出版历程
- 收稿日期: 2005-07-18
- 修回日期: 2005-12-12
- 刊出日期: 2007-04-19

A Novel Grouping Method for LDSTBC+OFDM

摘要

摘要: 基于OFDMA(Orthogonal Frequency-Division Multiple Access)中不同用户所分配的子载波不同，提出了频率选择性衰落信道下分层结构的差分空时分组编码LDSTBC(Layered Differential Space-Time Block Code)的一种新的分层方法。发射端采用分层结构的差分空时分组编码结合OFDM技术，在接收端提出了利用OFDM中子载波选择矩阵进行分组干扰抑制，然后对LDSTBC的每层进行差分空时分组码的传统解码。相对于基于奇异值分解的分组干扰抑制方法，该文提出的方法只需要1根接收天线，降低了系统接收机设计的复杂度。仿真结果验证了所提出的方法的性能优于基于奇异值分解的方法。
- OFDM;分层结构差分空时分组编码;空时编码;分组干扰抑制
Abstract: A novel grouping method is proposed for LDSTBC(Layered Differential Space-Time Block Code) over frequency selective channels, relying on mutual orthogonality between subcarriers of different users in OFDMA(Orthogonal Frequency-Division Multiple Access) systems. At the transmitter, LDSTBC combined with OFDM is applied . At the receiver, the group suppression based on subcarrier selection matrices is used, then the traditional decoding method for DSTBC is used for each layer. Compared with SVD the improved approach only needs one receive antenna so the complexity of the receiver decreases remarkably. Simulation results show that the performance of the improved method is better than the one based on SVD.

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[1] Tarokh V, Seshadri N, and Calderbank A R. Space-time codes for high data rate wireless communication: Performance criterion and codes construction[J].IEEE Trans. on IT.1998, 44(2):744-765 [2] Tarokh V, Jafarkhani H, and Calderbank A R. Space-time block codes from orthogonal designs[J].IEEE Trans. on IT.1999, 45(5):1456-1467 [3] Foschini G J. Layered space-time architecture for wireless communication in fading environment when using multiple antennas[J].Bell Labs. Technical Journal.1996, 1(2):41-59 [4] Alamouti S M. A simple transmitter diversity scheme for wireless communication[J]. IEEE J. on SAC, 1998, 16(10): 1451-1458. [5] Tarokh V, Jafarkhani H, and Calderbank A R. Space-time codes for high data rate wireless communication: performance criterion in the presence of channel estimation, errors, mobility, and multiple paths[J].IEEE Trans. on Communications.1999, 47(2):199-207 [6] V Tarokh V, Jafarkhani H, and Calderbank A R. Space-time block coding for wireless communications: performance results[J]. IEEE J. on SAC, 1999, 17(3): 451-460. [7] Tarokh V and Jafarkhani H. A differential detection scheme for transmit diversity[J]. IEEE J. on SAC,2000, 18(7): 1169-1174. [8] Hughes B L. Differential space-time modulation[J].IEEE Trans. on IT.2000, 46(7):2567-2578 [9] Tarokh V, Naguib A, and Seshadri N, Combined array processing and space-time coding. IEEE Trans. on IT, 1999, 45(4): 1121-1128. [10] Lu Ben and Wang Xiaodong. Space-Time Code Design in OFDM Systems. IEEE GLOBECOM, San Francisco, Dec.2000, 2: 1000-1004. [11] Agrawal D, Tarokh V, and Naguib A, et al.. Space-time coded OFDM for high data-rate wireless communication over wideband channels[J]. Proc. Veh. Technol. Conf., Ottawa, Canada, 1998, 18-21: 2232-2236. [12] Wang Z and Giannakis G B. Wireless multicarrier communications: Where Fourier meets Shannon[J].IEEE Signal Processing Magazine.2000,17(3):29-48

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