重叠时分复用在软线无线电的设计与实现
首发时间:2018-09-28
摘要:重叠时分复用(Overlapped Time Division Multiplexing-OVTDM)是一种新型波形编码方法,其可以在低信噪比(SNR)下获得高的频谱效率。本文介绍了OVTDM系统通过收发器在实际通道条件下的性能。通过使用LABVIEW和通用软件无线电外设(USRP)平台对系统数值进行模拟。本文绘制了通过USRP收发之后的信号星座图与眼图。此外,通过移动收发机之间的距离从而改变信噪比,进行了对于约束长度不同的OVTDM信号,误码率与信噪比之间的性能比较。实验结果表明,OVTDM信号经过测试平台的实际信道性能与AWGN信道的性能相接近。
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Design and Implementation of OVTDM System on Software Defined Radio Testbed
Abstract:Overlapped Time Division Multiplexing (OVTDM) is a wave-form coding method which can obtain high spectral efficiency (SE) under low signal-to-noise ratio (SNR). In this paper, we present the hardware performance of OVTDM transceivers in the conditions of practical channels. In addition, numerical simulation and experimental research platform are combined to evaluate OVTDM performance using LabVIEW and Uni-versal Software Radio Peripheral (USRP), respectively. As the results, constellation and eye diagram of OVTDM modulation schemes are shown. Moreover, for different constraint length of OVTDM, we evaluated the BER compared to various transmitter-receiver distances, which shows that the perfor-mance of practical channel is comparatively close to that of the theoretical channel on our testbed.
Keywords: OVTDM USRP transceivers testbed
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