The Study of OFDM ICI Cancellation Schemes in 2.4 GHz Frequency Band Using Software Defined Radio
The Study of OFDM ICI Cancellation Schemes in 2.4 GHz Frequency Band Using Software Defined Radio
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基于软件定义无线电的2.4 GHz频段OFDM ICI消除方案研究
DOI：
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发表时间：
2011
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影响因子：
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通讯作者：
Barnaly Rashid
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作者：
Miftahur Rahman;Sajjadul Latif;Tasnia Ahad;Shabbir Ahmed;Preyom Kanti Dey;M. Rashid;Barnaly Rashid
在正交频分复用（OFDM）中，频率偏移是一个常见的问题，它会导致载波间干扰（ICI），从而降低传输信号的质量。许多理论研究的不同ICI消除计划已被许多作者早先报道。在2.4 GHz频带的理论预测结果的实验验证的需要是重要的。最广泛使用的系统之一是Wi-Fi（IEE 802.11b），其利用该频带进行短程无线通信，吞吐量高达11 Mbps。在这项工作中，几个新的ICI消除方案已在2.4 GHz频率使用开源软件定义无线电（SDR），即GNU无线电测试。实验中使用的GNU Radio系统有两个连接到计算机的通用软件无线电外设（USRP N210）模块。两个USRP单元都有一个子板（XCVR 2450），用于发送和接收无线电信号。根据IEEE-802.11b规范准备USRP的输入数据。实验结果与新的载波间干扰（ICI）消除方案的理论结果进行了比较。结果表明，新方案适用于高性能传输。本文的结果开辟了新的机会，使用OFDM在严重拥塞的2.4 GHz和5 GHz频段（WiFi 5：IEEE 802.a）的无差错数据传输。该方案也可用于信道严重拥塞的其他频率。
In Orthogonal Frequency Division Multiplexing (OFDM), frequency offset is a common problem that causes inter-carrier-interference (ICI) that degrades the quality of the transmitted signal. Many theoretical studies of the different ICI-cancellation schemes have been reported earlier by many authors. The need for experimental verification of the theoretically predicted results in 2.4 GHz frequency band is important. One of most widely used systems is Wi-Fi (IEE 802.11b) that makes use of this frequency band for short range wireless communication with throughput as high as 11 Mbps. In this work, several new ICI cancellation schemes have been tested in 2.4 GHz frequency using open source Software Defined Radio (SDR) namely GNU Radio. The GNU Radio system used in the experiment had two Universal Software Radio Peripheral (USRP N210) modules connected to a computer. Both the USRP units had one-daughterboard (XCVR2450) each for transmission and reception of radio signals. The input data to the USRP was prepared in compliance with IEEE-802.11b specification. The experimental results were compared with the theoretical results of the new Inter-Carrier Interference (ICI) cancellation schemes. The comparison of the results revealed that the new schemes are suitable for high performance transmission. The results of this paper open up new opportunities of using OFDM in heavily congested 2.4 GHz and 5 GHz bands (WiFi5: IEEE 802.a) for error free data transmission. The schemes also can be used in other frequencies where channels are heavily congested.