Abstract

For the underlay spectrum sharing, a primary transmitter (PT) and a secondary transmitter (ST) can transmit simultaneously to a primary receiver (PR) and a secondary receiver (SR), respectively. The transmit power of ST is strictly controlled under the performance constraint of primary system. The strong interference from PT and the weak signal from ST make the communication quality of secondary system very poor, especially when the two systems are close. In this work, we adopt the successive interference cancellation (SIC) technique at either or both of PR and SR for the data detection. Four spectrum sharing schemes are studied, i.e., PR–DIR–SR–DIR, PR–DIR–SR–SIC, PR–SIC–SR–DIR, PR–SIC–SR–SIC. The transmit power of ST is properly set to minimize the secondary outage probability subject to a performance-loss constraint of primary system. Numerical results show that the SIC decoding can significantly improve the spectral efficiency, especially when PR performs the SIC decoding.

中文翻译：

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在主接收机和副接收机处具有自适应干扰消除功能的底层频谱共享

摘要

对于底层频谱共享，主要发送器（PT）和辅助发送器（ST）可以分别同时发送到主要接收器（PR）和辅助接收器（SR）。在主系统的性能约束下，严格控制ST的发射功率。PT的强干扰和ST的弱信号使二次系统的通信质量非常差，尤其是在两个系统接近时。在这项工作中，我们在PR和SR之一或两者上采用连续干扰消除（SIC）技术进行数据检测。研究了四种频谱共享方案，即PR–DIR–SR–DIR，PR–DIR–SR–SIC，PR–SIC–SR–DIR，PR–SIC–SR–SIC。适当地设置ST的发射功率，以使遭受二次系统中断的可能性降到最低，这要受到一次系统的性能损失约束。