Title :
Soft output detector for convolutionally encoded Parity Bit selected Multicarrier Direct-Sequence Spread Spectrum system
Author :
Mirzaee, Alireza ; Amours, Claude D.
Author_Institution :
Sch. of Inf. Technol. & Eng., Univ. of Ottawa, Ottawa, ON
Abstract :
In this paper we investigate the performance of the Parity Bit selected Multicarrier Direct Sequence Spread Spectrum (PB-MC-DS-SS) system using Log Likelihood Ratio (LLR). In this system information bits are convolutionally encoded prior to being used in the parity bit selected MC-DS-SS system. Reliability of the detected bits in the receiver is calculated in the form of LLRs and then used as the input of a soft input Viterbi decoder. The performance of the proposed system is compared to conventional coded multicarrier spread spectrum systems where no parity bit selected spreading sequence is used.
Keywords :
Viterbi decoding; convolutional codes; parity check codes; spread spectrum communication; convolutionally encoded parity bit selected system; information bits; log likelihood ratio; multicarrier direct-sequence spread spectrum system; soft input Viterbi decoder; soft output detector; Bandwidth; Bit error rate; Convolutional codes; Decoding; Detectors; Frequency diversity; Information technology; Matched filters; Rayleigh channels; Spread spectrum communication; Multicarrier spread spectrum communication; error control coding; log likelihood ratio;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2008. PIMRC 2008. IEEE 19th International Symposium on
Conference_Location :
Cannes
Print_ISBN :
978-1-4244-2643-0
Electronic_ISBN :
978-1-4244-2644-7
DOI :
10.1109/PIMRC.2008.4699817
