A scheme to avoid interference via constellation rotation for cooperative device-to-device systems

被引：0
作者：
Sun, Li [1 ]
Xu, Hongbin [1 ]
机构：
[1] School of Electronics and Information Engineering, Xi'an Jiaotong University, Xi'an
来源：
Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University | 2015年 / 49卷 / 12期
关键词：
Constellation rotation; Device-to-device; Interference avoidance; probability; Symbol error;
D O I：
10.7652/xjtuxb201512002
中图分类号：
学科分类号：
摘要：
A scheme to avoid interference via constellation rotation for cooperative device-to-device (D2D) systems is proposed to deal with the cross interference between the cellular link and the D2D link, and to improve the system error performance. The signal constellation is first rotated, and the phase of the channel coefficient is pre-compensated at each terminal. Then, orthogonal channels at different nodes are used to send their signals. In this manner, the inherent orthogonality between the real and imaginary components of a complex signal can be utilized to avoid the interference. Finally, the value of the rotation angle is carefully designed to maximize the minimum Euclidian distance among the signal points, so that the symbol error probabilities (SEP) for cellular communications as well as D2D communications are effectively reduced. Simulation results and comparisons with the conventional cooperative two-way transmission scheme show that when QPSK modulation is adopted and the system average signal-to-noise ratio is higher than 20 dB, the proposed scheme can reduce the system SEP from 10-1 to 10-3. © 2015, Xi'an Jiaotong University. All right reserved.
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页码：6 / 11
页数：5
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