Title :
Sequence-based BDFE with soft feedback for turbo equalization
Author :
Dou, Gaoqi ; Gao, Jun ; Liu, Bing
Author_Institution :
Dept. of Commun. Eng., Naval Univ. of Eng., Wuhan
Abstract :
A sequence-based block decision feedback equalizer (BDFE) with soft feedback is presented for turbo equalization. The proposed algorithm can be used in the channel equalization for calculation of the a posteriori probability (APP) by collecting information of the entire block as in maximum a-posteriori probability (MAP) algorithm. The sequence-based detection is made possible by combining both soft a priori information from channel decoder and soft feedback from BDFE. Replaced hard feedback with soft feedback reduces the effects of the error propagation. Meanwhile, combining soft feedback with sequenceed-based detection can provide more reliable information for the calculation of the APP. Simulation results confirm the superiority of the new proposed equalizer comparing with current low complexity turbo equalizers with similar complexity.
Keywords :
channel estimation; decision feedback equalisers; probability; turbo codes; BDFE; a posteriori probability calculation; block decision feedback equalization; channel equalization; sequence-based block decision feedback equalizer; sequenceed-based detection; soft feedback; turbo equalization; Binary phase shift keying; Decision feedback equalizers; Filtering; Finite impulse response filter; Intersymbol interference; Iterative algorithms; Iterative decoding; Probability; Quadrature phase shift keying; System performance; Turbo equalization; block decision feedback equalization; sequence-based detection; soft feedback;
Conference_Titel :
Communication Technology, 2008. ICCT 2008. 11th IEEE International Conference on
Conference_Location :
Hangzhou
Print_ISBN :
978-1-4244-2250-0
Electronic_ISBN :
978-1-4244-2251-7
DOI :
10.1109/ICCT.2008.4716197
