【作者】 李巧玲； 许宗泽；

【Author】 Li Qiaoling Xu Zongze Dept of Information and Technology,Nanjing University of Aeronautics and Astronautics 210016

【机构】 南京航空航天大学信息科学与技术学院；

【摘要】 准正交空时分组码在发射天线数大于2时具有最大传输速率和误码率低的优点,但在高信噪比条件下,其性能劣于正交空时分组码。为了提高准正交空时分组码的性能,本文提出一种基于随机相位旋转的准正交空时分组码（Random-Phase-Rotation QO-STBC）。仿真结果表明,该方案的误码率性能有显著提高。在 QPSK 调制下,当误比特率为10^-5时,比传统 QO-STBC 有约3dB 的增益,相比于 LCP 仍有 1dB 增益;在8PSK 调制下,当误比特率为10^-4时,比传统 QO-STBC 有1dB 的增益,与 LCP 相比具有0. 5dB 增益。文章讨论了实际系统中随机旋转向量数对性能的影响,结果显示当旋转向量数大于64时, 基本接近理想性能。更多还原

【Abstract】 Quasi-Orthogonal Space-Time Block Code （QO-STBC） that can provide full transmission rate and low Bit Error Rate （BER） is feasible for more than two antennas,but QO-STBC have worse performance than O-STBC at high Signal-to-Noise Rati- os （SNB）.In order to improve the performance of QO-STBC,a Random-Phase-Rotation QO-STBC （RPR-QO-STBC） is pro- posed.Simulation results suggest,this code can improve the BER performance remarkably.In QPSK modulation,when the BER is 10^-5,the proposed system outperforms the conventional QO-STBC about 3dR,and also better than LCP 1dB;In 8PSK modu- lation,when the BER is 10^-4,the proposed system outperforms the conventional QO-STBC about 1dB,and also better than LCP 0.5dB.The performance effect due to the number of random-rotation vectors in the practical scenario is investigated,results sug- gest,the situation that the performance is basically close to ideality can be proved when the number is great than 64.更多还原