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Simulation and FPGA-Based Implementation of OFDM Demodulation in China Mobile Multimedia Broadcasting Standard

Author: LiaoMinChao
Tutor: ZhouJiZuo
School: Beijing University of Posts and Telecommunications
Course: Communication and Information System
Keywords: China Mobile Multimedia Broadcasting (CMMB) OFDM Modulation and demodulation FFT / IFFT Group 4/2 butterfly operation FPGA
CLC: TN919.3
Type: Master's thesis
Year: 2009
Downloads: 225
Quote: 4
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Abstract


As people on the digital video information growing demand , mobile TV technology has developed rapidly in China , China Mobile Multimedia Broadcasting CMMB standard also in October 24, 2006 formally introduced , mainly for small-screen handheld terminal device provides digital broadcasting television programs, comprehensive information and emergency broadcast services, to achieve a satellite transmission and terrestrial networks together seamlessly combined coverage . CMMB mobile terminal during the Beijing Olympics has been widely used to provide mobile TV services widely acclaimed. With the official release of 3G licenses , mobile TV and 3G mobile terminal fusion has great practical value and broad market prospects , CMMB standard simulation and implementation is particularly important . In CMMB system , OFDM modulation is the given frequency band into a plurality of sub-bands , each sub -band orthogonal carriers with data transmission , the modulated signal of each sub -carrier signal superimposed on the time domain sampling structures satisfy the relationship IFFT . After IFFT , the transmitted data in the frequency domain is sufficiently randomized, can be considered independent and identically distributed random variables linear combination , so by the central limit theorem OFDM modulated signal obey Gaussian distribution . In addition , to eliminate multipath fading in the OFDM symbol as a cyclic prefix is ??added to the guard interval , to effectively avoid the inter-symbol interference. This paper analyzes the CMMB standard OFDM technology role and related principles , and then follow the standard requirements of the simulation of the OFDM demodulation module fixed-point performance , the last in Quartus Ⅱ 6.0 simulation environment using Altera's Stratix Ⅱ series EP2S180F1020C3 chip hardware implementation of complete solutions . OFDM demodulation FFT transformation submodule core group with a 4/2 butterfly algorithm . The algorithm is simple and effective method to calculate faster, uses less space hardware resources , improving performance. Currently this design features implemented in the FPGA chip normal , stable , reaching the pre-set experimental purposes .

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