Symbol-based turbo codes

• Published in: IEEE communications letters Vol. 3; no. 10; pp. 285 - 287
• Main Authors: Bingeman, M., Khandani, A.K.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01-10-1999; Institute of Electrical and Electronics Engineers
• Subjects: Applied sciences; Bit error rate; Convolution; Convolutional codes; Decoding; Delay; Exact sciences and technology; Modulation coding; Multiaccess communication; Speech coding; Spread spectrum communication; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Transmission and modulation (techniques and equipments); Turbo codes; Waveform; Convolutional code; Bit error rate; Likelihood ratio; Trellis code; Modeling; Phase shift keying; Experimental result; Code division multiple access; Telecommunication network; A priori estimation; Numerical simulation; Signal to noise ratio
• ISSN: 1089-7798; 1558-2558
• DOI: 10.1109/4234.798019

We present a new turbo-coding method which parses the input block into n-bit symbols and interleaves on a symbol-by-symbol basis. This is used in conjunction with different modulation techniques to take advantage of tradeoffs between bit error rate performance, code-rate, spectral efficiency, and decoder complexity. The structure of the encoder and decoder of these codes, which We call symbol-based turbo codes, are outlined. The bit error rate performance of a few specific codes are examined. A discussion on decoder complexity is also included. Symbol-based turbo codes are good candidates for low delay transmission of speech and data in spread spectrum communication systems.