arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0810.2953cs.ITmath.IT
收藏

双用户认知信道中的功率控制和频率复用研究

On Power Control and Frequency Reuse in the Two User Cognitive Channel

Onur Ozan Koyluoglu, Hesham El Gamal

摘要:

本文考虑了广义认知无线电信道,允许次用户在主用户的空闲和活动期间重用频率,只要主速率保持不变。在这种情况下,单输入单输出(SISO)的主要和次要信道的最佳功率分配政策进行了探讨。有趣的是,所提供的增益所产生的频率复用期间的频谱的活跃期示出消失在低和高的信号噪声比(SNR)制度。然后,我们认为,在高SNR区域的这个缺点可以通过装备多个天线的主发射机和次发射机来避免。最后,SISO主信道和多输入多输出(MIMO)辅信道组成的情况下进行了研究。在这里,一个简单的迫零方法被证明是显着优于著名的解码转发脏纸编码策略(特别是在高SNR制度)。

英文摘要:

This paper considers the generalized cognitive radio channel where the secondary user is allowed to reuse the frequency during both the idle and active periods of the primary user, as long as the primary rate remains the same. In this setting, the optimal power allocation policy with single-input single-output (SISO) primary and secondary channels is explored. Interestingly, the offered gain resulting from the frequency reuse during the active periods of the spectrum is shown to disappear in both the low and high signal-to-noise ratio (SNR) regimes. We then argue that this drawback in the high SNR region can be avoided by equipping both the primary and secondary transmitters with multiple antennas. Finally, the scenario consisting of SISO primary and multi-input multi-output (MIMO) secondary channels is investigated. Here, a simple Zero-Forcing approach is shown to significantly outperform the celebrated Decoding-Forwarding-Dirty Paper Coding strategy (especially in the high SNR regime).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑