Title :
Turbo codes for time varying AWGN channels with application to FH/SSMA
Author :
El Gamal, Hesham ; Geraniotis, Evaggelos
Author_Institution :
Dept. of Electr. Eng., Maryland Univ., College Park, MD, USA
Abstract :
We investigate the application of parallel concatenated convolutional codes (i.e., turbo codes) to additive white Gaussian noise channels with time-varying variance. Applications of this model include multiple-access interference and partial-band noise jamming in frequency hopped networks. Three schemes for evaluating the likelihood ratio of the channel output are compared. These schemes provide tradeoffs between simplicity of implementation, BER performance, and robustness to inaccuracies in the measurements
Keywords :
AWGN channels; concatenated codes; convolutional codes; error statistics; frequency hop communication; iterative decoding; jamming; maximum likelihood estimation; multi-access systems; spread spectrum communication; time-varying channels; turbo codes; BER performance; FH/SSMA; additive white Gaussian noise channels; channel output; frequency hopped networks; generalized maximum likelihood ratio test; likelihood ratio; measurement inaccuracies robustness; multiple-access interference; parallel concatenated convolutional codes; partial-band noise jamming; time varying AWGN channels; turbo codes; AWGN channels; Additive white noise; Bit error rate; Concatenated codes; Convolutional codes; Frequency; Gaussian noise; Jamming; Multiple access interference; Turbo codes;
Conference_Titel :
Information Theory, 1998. Proceedings. 1998 IEEE International Symposium on
Conference_Location :
Cambridge, MA
Print_ISBN :
0-7803-5000-6
DOI :
10.1109/ISIT.1998.709062
