Exact SER analysis of ZF-DFE for M-QAM on multipath fast fading channels = 다중경로 패스트 페이딩 채널에서 임의의 QAM에 대한 ZF-DFE의 성능 분석

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Zero-forcing decision feedback equalization (ZF-DFE) has been widely investigated in an effort to alleviate intersymbol interference (ISI) problem caused by delay spread on both wired and wireless communication channels. Among nonlinear equalizer, the ZF-DFE is most common because it is fairly simple to implement and performs well. However, on channels with low signal-to-noise ratio (SNR), the ZF-DFE have error propagation problem by decision error. Furthermore, the analysis of the error propagation in ZF-DFE is difficult by the fact that little is known about the distribution of the errors. One of the previous works uses Markov model to analyze ZF-DFE performance with error propagation for pulse amplitude modulation (PAM) signals. Another approach uses an approximate Fourier series to evaluate the effect of residual ISI from future symbols, and derive approximate BER expressions for quadrature phase-shift keying (QPSK) on static Rayleigh fading channels. Even though theses approaches provide upper bound considering the effect of error propagation, they are restricted only to PAM or QPSK signals. Also, upper bound of ZF-DFE performance over M-ary quadrature amplitude modulation (M-QAM) is derived by using minimum mean square error (MMSE) concept on static Rayleigh fading channels. However, the effect of error propagation is not considered by assuming correct decision of previous symbol. Most of previous works consider static multipath channels. However, mobile radio communication channels are time-varying multipath fading channels. Therefore, practical analysis on wireless radio channel characterized by fast time-variations is necessary. In this thesis, we analyze the symbol error rate (SER) of ZF-DFE on wireless radio channels. We bring the concept of “error event” and “state” related to error propagation, which is introduced for zero-forcing successive interference cancellation (ZF-SIC) detector. However, we need a new approach in order to find exact...
Park, Hyun-Cheolresearcher박현철researcher
한국과학기술원 : 전기 및 전자공학과,
Issue Date
455233/325007  / 020084315

학위논문(석사) - 한국과학기술원 : 전기 및 전자공학과, 2010.08, [ v, 36 p. ]


M-QAM; SER Analysis of ZF-DFE; Multipath Fast Fading Channels; 다중경로 패스트 패이딩 채널; 임의의 QAM; ZF-DFE의 성능 분석

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