Design and implementation of an underlay control channel for NC-OFDM-based networks

Ratnesh Kumbhkar, G. Sridharan, N. Mandayam, I. Seskar, S. Kompella
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引用次数: 7

Abstract

This paper designs an underlay control channel for noncontiguous-OFDM-based cognitive networks. Noncontiguous OFDM (NC-OFDM) provides a fast and flexible manner of accessing disjoint parts of the spectrum and is ideally suited for dynamic spectrum access. While similar to OFDM, NC-OFDM explicitly restricts transmission to only certain subcarriers that are free of incumbent transmissions. In particular, this paper considers designing a control channel for a cognitive network consisting of multiple point-to-point (p2p) links that operate over a wide bandwidth that might encompass some primary transmissions. In such a scenario, control channel becomes vital not only to share basic transmission parameters but also to aid timing and frequency recovery of NC-OFDM transmission; a nontrivial problem in itself. The proposed design is a low-power underlay transmission that spans the entire bandwidth regardless of any incumbent transmissions and uses direct sequence spread spectrum (DSSS). The control channel operates in one of two modes. The first mode aids timing and frequency recovery through a two-step process, while the second mode is used for control data transmission. To enable multiple access, the p2p links use orthogonal pseudo-noise (PN) sequences. The proposed control channel is implemented on USRPs in the ORBIT testbed using GNU Radio. Experimental results suggest robust timing and frequency offset recovery even in the presence of concurrent primary transmissions and support for about 10 to 20kbps over a 1 MHz bandwidth at an uncoded symbol-error-rate of about 10-2 under typical operating conditions.
基于nc - ofdm网络的底层控制通道的设计与实现
本文设计了一种基于不连续ofdm认知网络的底层控制信道。非连续OFDM (NC-OFDM)提供了一种快速灵活的方式来访问不相交的频谱部分,非常适合于动态频谱访问。虽然与OFDM类似,但NC-OFDM明确地将传输限制在某些没有现有传输的子载波上。特别是,本文考虑为一个由多个点对点(p2p)链路组成的认知网络设计一个控制通道,这些链路在可能包含一些主要传输的宽带宽上运行。在这种情况下,控制信道不仅对共享基本传输参数,而且对NC-OFDM传输的定时和频率恢复至关重要;这本身就是一个很重要的问题。提出的设计是一个低功耗的底层传输,跨越整个带宽,而不考虑任何现有的传输,并使用直接序列扩频(DSSS)。控制通道以两种模式之一运行。第一种模式通过两步过程辅助定时和频率恢复,而第二种模式用于控制数据传输。为了实现多路访问,p2p链路使用正交伪噪声(PN)序列。利用GNU Radio在ORBIT试验台的usrp上实现了所提出的控制通道。实验结果表明,即使在并发主传输存在的情况下,该系统也具有鲁棒的定时和频率偏移恢复能力,并且在典型操作条件下,在1 MHz带宽上支持约10至20kbps的非编码符号误码率约为10-2。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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