两层认知无线电网络中的范德蒙子空间频分复用
Vandermonde-subspace Frequency Division Multiplexing for Two-Tiered Cognitive Radio Networks
摘要：
Vandermonde子空间频分复用（VFDM）是一种用于认知无线电的重叠频谱共享技术。VFDM利用基于Vandermonde结构的预编码器来在次系统上发送信息，同时保持基于正交频分复用（OFDM）的主系统无干扰。为此，VFDM利用频率选择性和主系统对循环前缀的使用。在此，给出了VFDM的全局视图，还包括诸如线性接收机和信道估计的影响的实际方面。我们表明，VFDM提供了一个频谱效率增加高达1 bps/Hz的认知无线电系统的基础上未使用的频带检测。我们还提出了一些关键的设计参数，其未来的实施和可行的信道估计协议。最后，我们表明，即使当一些理论假设放宽，VFDM提供不可忽略的速率，同时保护主系统。
英文摘要：
Vandermonde-subspace frequency division multiplexing (VFDM) is an overlay spectrum sharing technique for cognitive radio. VFDM makes use of a precoder based on a Vandermonde structure to transmit information over a secondary system, while keeping an orthogonal frequency division multiplexing (OFDM)-based primary system interference-free. To do so, VFDM exploits frequency selectivity and the use of cyclic prefixes by the primary system. Herein, a global view of VFDM is presented, including also practical aspects such as linear receivers and the impact of channel estimation. We show that VFDM provides a spectral efficiency increase of up to 1 bps/Hz over cognitive radio systems based on unused band detection. We also present some key design parameters for its future implementation and a feasible channel estimation protocol. Finally we show that, even when some of the theoretical assumptions are relaxed, VFDM provides non-negligible rates while protecting the primary system.
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