侦听与对话：全双工认知无线电网络协议设计与分析
Listen-and-Talk: Protocol Design and Analysis for Full-duplex Cognitive Radio Networks
摘要：
在传统的认知无线电网络中，次用户（SU）通常通过两阶段“先说后做”（LBT）协议接入主用户（PU）的频谱，即，SU在第一阶段感测频谱空洞，然后在第二阶段进行传输。然而，存在两个主要问题：1）由于感测而导致的传输时间减少，以及2）由于数据传输而导致的感测准确性损害。在本文中，我们提出了一个“通话”（LAT）协议的帮助下，全双工（FD）技术，允许SU同时感测和访问的空闲频谱。分析了该算法的频谱利用性能，给出了频谱浪费率和频谱碰撞率的解析表达式。此外，关于二次吞吐量，我们报告存在的二次发射功率和吞吐量之间的权衡。基于功率吞吐量的权衡，我们推导出解析的本地最优发射功率的SU，以实现高吞吐量和满意的检测精度。数值结果验证了所提出的协议和理论结果。
英文摘要：
In traditional cognitive radio networks, secondary users (SUs) typically access the spectrum of primary users (PUs) by a two-stage "listen-before-talk" (LBT) protocol, i.e., SUs sense the spectrum holes in the first stage before transmitting in the second. However, there exist two major problems: 1) transmission time reduction due to sensing, and 2) sensing accuracy impairment due to data transmission. In this paper, we propose a "listen-and-talk" (LAT) protocol with the help of full-duplex (FD) technique that allows SUs to simultaneously sense and access the vacant spectrum. Spectrum utilization performance is carefully analyzed, with the closed-form spectrum waste ratio and collision ratio with the PU provided. Also, regarding the secondary throughput, we report the existence of a tradeoff between the secondary transmit power and throughput. Based on the power-throughput tradeoff, we derive the analytical local optimal transmit power for SUs to achieve both high throughput and satisfying sensing accuracy. Numerical results are given to verify the proposed protocol and the theoretical results.
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