Title :
Reduced-state cyclic Viterbi receiver for localized SC-FDMA uplink system
Author :
Jeng-Kuang Hwang ; Jeng-Da Li ; Yu-Chang Hsu ; Chuan-Shun Lin
Author_Institution :
Inst. of Commun. Eng., Yuan-Ze Univ., Chungli, Taiwan
Abstract :
For the single-carrier localized frequency-division-multiple-access (SC-LFDMA) uplink system, it is shown that the equivalent channel can be modeled as a cyclic ISI (CISI) channel. Under such a channel, we derive the optimum cyclic Viterbi (CV) receiver, which outperforms those suboptimal frequency-domain equalizers. In order to apply CV to SC-LFDMA system in practice, we then consider a reduced-state CV by using decision feedback (DF) with local tentative decisions. However, the CV-DF receiver will suffers from error propagation when the CISI channel is non-minimum phase. Therefore, an all-pass prefilter (APPF) is further designed in cepstrum-domain to tame the channel phase response, resulting in a CV-APPF-DF receiver which provides a good tradeoff between error performance and complexity. Computer simulation results are included to demonstrate the excellent performance of the full-state CV receiver, and the near optimum performance of the CV-APPF-DF receiver.
Keywords :
all-pass filters; cepstral analysis; decision feedback equalisers; equalisers; error analysis; frequency division multiple access; frequency-domain analysis; intersymbol interference; APPF; CISI channel; CV-APPF-DF receiver; SC-LFDMA uplink system; all-pass prefilter; cepstrum-domain; channel phase response; cyclic intersymbol interference; decision feedback; equivalent channel; error propagation; localized SC-FDMA uplink system; reduced-state cyclic Viterbi receiver; single-carrier localized frequency-division multiple-access; suboptimal frequency-domain equalizer; Channel models; Complexity theory; Equalizers; Maximum likelihood estimation; Receivers; Uplink; Viterbi algorithm; All Pass Filter; Cyclic Viterbi; Decision Feedback; SC-LFDMA;
Conference_Titel :
Signals, Systems and Computers, 2014 48th Asilomar Conference on
Print_ISBN :
978-1-4799-8295-0
DOI :
10.1109/ACSSC.2014.7094610