论文标题
宽带协作频谱使用大量MIMO决策融合
Wideband Collaborative Spectrum Sensing using Massive MIMO Decision Fusion
论文作者
论文摘要
在本文中，为了应对认知无线电（CR）网络中的频谱探索\和分配的主要挑战，我们将决策融合（DF）的一般框架应用于基于正交频施加（OFDM）报告的宽带协作频谱传感。在发射器侧，我们使用无环前缀（CP）的OFDM，以提高用户密度高的网络中报告阶段的总体带宽效率。另一方面，在接收器侧（报告通道的接收器侧）我们为DF的DF设备时间 - 反转广泛线性（TR-WL），时间反转最大比率组合（TR-MRC）和修改的DF的TR-MRC（TR-MMRC）规则。假定DF中心（DFC）配备了大型天线阵列，为许多未经授权的用户提供了竞争光谱的竞争，从而导致了``虚拟''大量多输入多输入（MIMO）通道。然后检查基于TR的（$ a $）符号和（$ b $）的基于TR的规则的有效性，而（$ b $）对传统（非TR）对应物的效果是根据信号到互动加值比率（SINR）的函数进行检查的。从系统的假警报和检测概率方面，封闭形式的性能是针对制定的融合规则得出的。最后，还通过蒙特卡洛模拟研究了大规模通道影响对拟议融合规则的影响。
In this paper, in order to tackle major challenges of spectrum exploration \& allocation in Cognitive Radio (CR) networks, we apply the general framework of Decision Fusion (DF) to wideband collaborative spectrum sensing based on Orthogonal Frequency Division Multiplexing (OFDM) reporting. At the transmitter side, we employ OFDM without Cyclic Prefix (CP) in order to improve overall bandwidth efficiency of the reporting phase in networks with high user density. On the other hand, at the receiver side (of the reporting channel) we device the Time-Reversal Widely Linear (TR-WL), Time-Reversal Maximal Ratio Combining (TR-MRC) and modified TR-MRC (TR-mMRC) rules for DF. The DF Center (DFC) is assumed to be equipped with a large antenna array, serving a number of unauthorized users competing for the spectrum, thereby resulting in a ``virtual'' massive Multiple-Input Multiple-Output (MIMO) channel. The effectiveness of the proposed TR-based rules in combating ($a$) inter-symbol and ($b$) inter-carrier interference over conventional (non-TR) counterparts is then examined, as a function of the Signal-to-Interference-plus-Noise Ratio (SINR). Closed-form performance, in terms of system false-alarm and detection probabilities, is derived for the formulated fusion rules. Finally, the impact of large-scale channel effects on the proposed fusion rules is also investigated, via Monte-Carlo simulations.
