【摘要】：在軍事通信領(lǐng)域,短波通信是一種非常重要的通信方式,但由于其通常采用電離層進(jìn)行遠(yuǎn)距離的信號(hào)傳輸,不可避免地要受到電離層信道的時(shí)變色散性以及多徑傳播效應(yīng)的影響,引起信號(hào)衰落和碼間干擾,Turbo均衡是克服這些缺點(diǎn)的有效方法。在工程中,使用DSP+FPGA是較為常見的實(shí)現(xiàn)方法,其能有效地將DSP運(yùn)算能力強(qiáng)以及FPGA并行工作的特點(diǎn)相結(jié)合。首先對(duì)基于MMSE準(zhǔn)則的頻域Turbo均衡以及軟干擾抵消(SIC)的均衡進(jìn)行了分析研究,然后討論了LDPC碼的基本原理、編譯碼算法,并給出了一種適合在FPGA平臺(tái)上實(shí)現(xiàn)的改進(jìn)的量化譯碼算法。最后,本文提出一種新的解決方案,該方案在FPGA上設(shè)計(jì)并實(shí)現(xiàn)了Turbo均衡系統(tǒng)中的uPP接口模塊、傅里葉變換與反傅里葉變換模塊、MMSE均衡與SIC均衡模塊、軟信息計(jì)算模塊、均值與方差計(jì)算模塊、交織與解交織模塊和LDPC譯碼模塊,并給出了各模塊的仿真結(jié)果。
[Abstract]:In the field of military communication, shortwave communication is a very important communication mode, but because it usually uses the ionosphere for long-distance signal transmission, it will inevitably be affected by the ionospheric channel time-varying dispersion and multipath propagation effect, resulting in signal fading and intersymbol interference. Turbo equalization is to overcome these shortcomings. In engineering, using DSP + FPGA is a common implementation method, which can effectively combine the strong DSP computing power with the characteristics of parallel operation of FPGA. Firstly, the frequency domain Turbo equalization and soft interference cancellation (SIC) equalization based on MMSE criterion are analyzed and studied, then the basic principle of LDPC code, coding and decoding algorithms are discussed. Finally, a new solution is proposed. The UPP interface module, Fourier transform and inverse Fourier transform module, MMSE equalization and SIC equalization module, and soft information computing module in Turbo equalization system are designed and implemented on FPGA. Value and variance calculation module, interleaving and de-interleaving module and LDPC decoding module, and the simulation results of each module are given.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN911.22

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 馬卓;杜栓義;王新梅;;基于量化的LDPC譯碼算法的高效實(shí)現(xiàn)[J];電子與信息學(xué)報(bào);2011年09期

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本文編號(hào)：2190474