基于随机旋转的准正交空时分组码研究

邓单; 朱近康

基于随机旋转的准正交空时分组码研究

邓单,
朱近康

计量
- 文章访问数: 2042
- HTML全文浏览量: 111
- PDF下载量: 854
- 被引次数: 0
出版历程
- 收稿日期: 2005-01-06
- 修回日期: 2005-07-08
- 刊出日期: 2006-09-19

Study on Random-Rotation Quasi-orthogonal Space-Time Block Code

摘要

摘要: 为了提高准正交空时分组码的性能，该文提出基于随机旋转的准正交空时分组码(Random-rotation QO-STBC)的发射分集方法。这种方法对每个输入信息符号序列进行随机旋转，使准正交空时分组码的符号间干扰(ISI)随机化。仿真结果表明，在41 MIMO QPSK调制系统中，采用最大似然检测方法，当误码率为10-5时，新的发射方案比传统的两种准正交空时分组码误码性能有约4dB的增益；当误码率低于10-4时，RR-J码相比于ST-LCP码，仍表现出0.51dB增益；当SNR高于16dB时，RR-J与CFR具有几乎相同的误码性能。文章讨论了实际系统中随机旋转矩阵数受限情况下性能的损失，仿真结果显示当可用随机旋转矩阵数大于16时，对系统性能的影响可以忽略。
- 空时分组码; 准正交; 随机旋转; 发射分集
Abstract: In order to improve the performance of Quasi-Orthogonal SpaceTime Block Code(QO-STBC), a Random-Rotation QO-STBC(RR-QO-STBC) is proposed. This transmission diversity scheme randomly rotates every information symbol vector, thus the inter-symbol interference between multi-antennas of QO-STBC is randomized and alleviated. Simulation results suggest, in 41 MIMO QPSK modulation system, under the ML detection rule，the proposed scheme outperforms the conventional QO-STBC about 4dB when the BER is 10-5, and also better than ST-LCP 0.51dB when the BER is below 10-4; The new scheme owns similar performance with the CFR scheme when SNR is above 16dB. The performance loss due to the limitation of number of random-rotation matrixes in the practical scenario is investigated. When the number of matrixes is greater than 16, the performance loss is negligible.

HTML全文

参考文献(1)

Alamouti S M. A simple transmit diversity technique for wireless communications[J].IEEE J. on Selected Areas in Communications.1998, 16(8):1451-[2]Tarokh V, Jafarkhani H, Calderbank A R. Space-time block codes from orthogonal designs[J].IEEE Trans. on Information Theory.1999, 45(5):1456-[3]Vielmon Antony, Li Ye, Barry J R. Performance of Alamouti transmit diversity over time-varying Rayleigh-fading channels[J].IEEE Trans. on Wireless Communications.2004, 3(5):1369-[4]Jafarkhani Hamid. A quasi-orthogonal space-time block code[J].IEEE Trans. on Communications.2001, 49(1):1-[5]Hottinen Ari, Tirkkonen Olav. A Randomization Technique for Non-Orthogonal Space-Time Block Codes. IEEE Vehicular Technology Conference, 2001 Spring. Greece, 6-9 May, 2001, 2: 1479.1482.[6]Tirkkonen Olav, Hottinen Ari. Tradeoffs between rate, puncturing and orthogonality in space-time block codes. IEEE International Conference on Communications, 2001, the Netherlands, 30 June -3 July, 2001, 4: 1117.1121.[7]Damen M O, Abed-Meraim K, Belfiore J C. Transmit diversity using rotated constellations with hadamard transform. IEEE Adaptive Systems for Signal Processing, Communications, and Control Symposium 2000, Canada,1-4 Oct., 2000: 396.401.[8]Sharma Naresh, Papadias Constantinos B. Improved quasi-orthogonal codes through constellation rotation[J].IEEE Trans. on Communications.2003, 51(3):332-[9]Su Weifeng, Xia Xiang-Gen. Signal constellations for quasi-orthogonal space-time block codes with full diversity[J].IEEE Trans. on Information Theory.2004, 50(10):2331-[10]Sezgin A, Jorswieck E A. On optimal constellations for quasi-orthogonal space-time codes. IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP'2003, Hong Kong, April 6-10, 2003, 4: 345.348.[11]Larsson Erik G. Improving the frame-error-rate of spatial multiplexing in block fading by randomly rotating the signal constellation[J].IEEE Communications Letters.2004, 8(8):514-[12]Xin Yan, Wang Zhengdao, Giannakis, G B. Space-time diversity systems based on linear constellation precoding[J].IEEE Trans. on Wireless Communications.2003, 2(2):294-[13]Jia Hou, Moon Ho Lee, Ju Yong Park. Matrices analysis of quasi-orthogonal space-time block codes[J].IEEE Communications Letters.2003, 7(8):385-[14]Tirkkonen O, Boariu A, Hottinen A. Minimal nonorthogonality rate one space time block codes for 3+ Tx antennas. Spread Spectrum Techniques and Applications, 2000 IEEE Sixth International Symposium on, USA, 6-8 Sept., 2000, 2: 429.432.[15]Marzetta Thomas L, Hochwald Bertrand M. Capacity of a mobile multiple-antenna communication link in Rayleigh flat fading[J].IEEE Trans. on Information Theory.1999, 45(1):139-

施引文献

资源附件(0)

访问统计