Vector trellis coded modulation using vector convolutional codes

Details Vector trellis coded modulation using vector convolutional codes Vector trellis coded modulation using vector convolutional codes

1996-06-21

1998-09-15

Pham, Chi H.

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

371 434, 371 437, H04L 2302, H04L 512

Patent

active

058090827

ABSTRACT:
A vector trellis coded modulation scheme (VTCM) is accomplished by blocking input samples into a sequence of input vectors of length L, vector convolutional coding the input vectors to map K input vectors into N output vectors and modulating the output vectors into symbols from an expanded alphabet. In a first case, each output vector is modulated to a different symbol thereby improving coding gain while maintain bandwidth efficiency. In a second case, blocks of N output vectors are modulated to one symbol thereby improving bandwidth efficiency by a factor of N while maintain coding gain. A polyphase/multirate representation of the vector convolutional codes is preferably used to generated the vector convolutional codes. In general, a computer search can be employed to find the polyphase coefficients that define the set of vector convolutional codes. When the input and output vectors have the same length, known scalar-valued convolutional codes are blocked to generate the vector convolutional codes. This provides good modulation codes without having to perform a computer search.

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R. Johannesson et al., "Further Results on Binary Convolutional Codes with an Optimum Distance Profile", IEEE Transactions on Information Theory, IT-24, Mar. 1978, pp. 264-268.
Shu Lin et al., "Convolutional Codes", Error Control Coding: Fundamentals and Applications, Chapter 10, Prentice-Hall, New Jersey, 1983, pp. 287-314.
E. Biglien et al., TCM: Combined Modulation and Coding, Introduction to Trellis-Coded Modulation with Applications, Chapter M, Macmillan Publishing Company, New York, 1991, pp. 67-98.

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