Apparatus and method for communicating digital data using trelli

Details Apparatus and method for communicating digital data using trelli Apparatus and method for communicating digital data using trelli

1993-05-05

1995-03-07

Chin, Stephen

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

371 43, 375244, 375316, H04L 512, H03M 1312

Patent

active

053965183

ABSTRACT:
Punctured binary convolutional codes are used in a trellis coded modulation scheme to achieve spectral efficiencies as high as those of multi-dimensional codes, using simple hardware. A base rate 1/2 binary convolutional code is punctured to rate n/k. The output of the punctured encoder is mapped to a four-way partition of a 2.sup.N point two-dimensional QAM constellation. The four-way partition consists of a two-way partition in both the I and Q dimensions. The two-way partitions of each dimension are used to transmit the two level output of the rate n/k binary convolutional coder. (N-2) "uncoded" bits are transmitted by selecting the unique constellation point in a partition group. The code has an average throughput of (N-2)+2n/k bits per symbol. The invention is also applicable to trellis coded amplitude modulation schemes based on 2.sup.N possible amplitude levels provided along a one-dimensional constellation.

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W. Wang, et al., "VLSI Implementation of a 16-State Coset Code," Integration, the VLSI Journal 9, No. 3, Jul., 1990, pp. 303-319.
M. Kavehrad, et al., "Bit Error Probability of Trellis-Coded Quadrature Amplitude Modulation Over Cross-Coupled Multidimensional Channels," IEEE Global Telecommmunications Conference, Houston, Texas, Dec. 1-4, 1986, vol. 2, pp. 1015-1022.

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