WRAN系统中信道估计算法研究
[Abstract]:With the rapid development of wireless communication technology, wireless spectrum resources become increasingly scarce. However, authorized users such as radio and television, who occupied a lot of resources in the very high frequency and ultra-high frequency (VHF/UHF) bands, were unable to make effective use of the spectrum, and a lot of white space (TVWS). Appeared in the television frequency bands. In order to make full use of the (IEEE) of TVWS, Electrical and Electronic Engineers in 2011, the wireless area network (WRAN). WRAN system was proposed to use TVWS for rural areas without interfering with authorized users. Low population density areas such as remote areas provide wireless broadband access. The physical layer of WRAN system is based on orthogonal Frequency Division Multiplexing (OFDM) modulation technology. In the OFDM receiver with coherent demodulation, the accuracy of channel estimation is directly related to the performance of the whole system. In this paper, the channel estimation method of WRAN system is studied. The research work includes the following aspects: 1. The C language simulation platform of WRAN system based on VS2010 is established. The correctness of the simulation platform is preliminarily verified by comparing the error performance of the system simulation platform in the additive Gao Si white noise (AWGN) channel with the theoretical error code formula. 2. The channel estimation method based on the preamble sequence is studied by using the preamble sequence inserted in each frame of the WRAN system. In the research of channel estimation method based on preamble sequence, its primary goal is to improve the accuracy of initial channel estimation based on high-density training sequence. Therefore, the low complexity polynomial interpolation method in frequency domain and the CIR detection method in time domain are studied, and the shortcomings of the maximum length multipath delay method in filtering noise are discussed. An improved (CIR) detection method based on double-sliding window channel impulse response is proposed. This method can detect low-power CIR components and improve the accuracy of channel estimation. The channel estimation method based on pilot sequence is studied by using pilot sequence inserted in each frame of data OFDM symbol in WRAN system. In the research of channel estimation method based on pilot sequence, the method of real coefficient FIR filter interpolation is studied emphatically, and the deficiency of real coefficient FIR interpolation in counteracting long delay SFN channel is analyzed. An improved adaptive complex interpolation channel estimation method is proposed. In this method, the real coefficient interpolation is transformed into complex coefficient interpolation by phase rotation, which greatly improves the ability of WRAN system to resist multipath delay, and the adaptive method can flexibly match the real maximum multipath delay of the channel. Improve the performance of channel estimation.
【学位授予单位】:电子科技大学
【学位级别】:硕士
【学位授予年份】:2014
【分类号】:TN911.2
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