Title :
Iterative channel estimation for turbo codes over fading channels
Author :
Valenti, Matthew C.
Author_Institution :
Dept. of Comput. Sci. & Electr. Eng., West Virginia Univ., Morgantown, WV, USA
Abstract :
A method for coherently detecting and decoding turbo coded BPSK signals transmitted over frequency-flat fading channels is discussed. Estimates of the complex channel gain and variance of the additive noise are derived first from known pilot symbols and an estimation filter. After each iteration of turbo decoding, the channel estimates are refined using information fed back from the decoder. Both hard-decision and soft-decision feedback are considered, and simulation results compare the proposed technique with DPSK, ideal BPSK, and non-iterative PSAM based reception
Keywords :
channel coding; fading channels; feedback; iterative decoding; modulation coding; noise; parameter estimation; phase shift keying; signal detection; turbo codes; DPSK; additive noise variance; channel estimates; coherent decoding; coherent detection; complex channel gain; estimation filter; frequency-flat fading channels; hard-decision feedback; ideal BPSK; iterative channel estimation; iterative decoding; noniterative PSAM based reception; pilot symbols; simulation results; soft-decision feedback; turbo coded BPSK signals; turbo codes; turbo decoding; Additive noise; Binary phase shift keying; Channel estimation; Differential quadrature phase shift keying; Fading; Feedback; Filters; Frequency; Iterative decoding; Turbo codes;
Conference_Titel :
Wireless Communications and Networking Confernce, 2000. WCNC. 2000 IEEE
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-6596-8
DOI :
10.1109/WCNC.2000.904767
