Multicarrier code division multiplex with iterative MAP symbol-by-symbol estimation

Author

Sanzi, Frieder ; Slama, Alexander ; Speidel, Joachim

Author_Institution

Inst. of Telecommun., Stuttgart Univ., Germany

Volume

2

fYear

2001

fDate

2001

Firstpage

886

Abstract

We consider a multicarrier code division multiplex (MC-CDM) scheme. At the receiver side the maximum a posteriori symbol-by-symbol estimator (MAPSSE) is used for the detection of the CDM signal. Therefore the influence of the spreading factor on the overall bit error rate (BER) is investigated. We concatenate the MAPSSE with the channel decoder which allows for iterative decoding. This system can be considered as a serially concatenated iterative decoding scheme whereby the inner decoder is replaced by the MAPSSE. Therefore the bit error rate can be further reduced by means of iterative decoding. A combination with an inner recursive systematic convolutional (RSC) component code with rate 1 is suggested to further improve the performance. The applications are broadcasting and, with some extensions, two-way communications

Keywords

concatenated codes; convolutional codes; error statistics; iterative decoding; land mobile radio; maximum likelihood estimation; multiplexing; signal detection; spread spectrum communication; BER; CDM signal detection; MAPSSE; MC-CDM; OFDM-CDMA; bit error rate; broadcasting; channel decoder; inner decoder; iterative MAP symbol-by-symbol estimation; maximum a posteriori symbol-by-symbol estimator; mobile communication systems; multicarrier code division multiplexing; receiver; recursive systematic convolutional component code; serially concatenated iterative decoding; spreading factor; two-way communications; Bit error rate; Code division multiplexing; Concatenated codes; Convolution; Convolutional codes; Digital modulation; Iterative decoding; Mobile communication; Multiaccess communication; OFDM;

fLanguage

English

Publisher

ieee

Conference_Titel

Global Telecommunications Conference, 2001. GLOBECOM '01. IEEE

Conference_Location

San Antonio, TX

Print_ISBN

0-7803-7206-9

Type

conf

DOI

10.1109/GLOCOM.2001.965546

Filename

965546