Encoding and detection of balanced codes

Details Encoding and detection of balanced codes Encoding and detection of balanced codes

1996-10-18

2000-01-18

Chin, Stephen

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

371 30, 371 437, 371 438, H04L 2706, G06F 1100, G06F 1110

Patent

active

060163305

ABSTRACT:
The present invention is an apparatus and method for detecting a codeword from a data stream comprising a series of sequences of samples representing intensities of an analog signal. The data stream may be output from, for example, a holographic storage device. The data stream is encoded using a code which may be represented by a trellis. One embodiment of the present invention uses a block encoded balanced code, one embodiment uses a finite state encoded balanced code and another embodiment uses a finite-state encoded DC free code. Each code defines a set of codewords which meet the constraints of the code. The codewords are detected from a sequence of samples by selecting the codeword having the greatest correlation with the sequence of samples. In a preferred embodiment, the correlation detection is implemented using the Viterbi process to iteratively determine correlations and codewords for each state at each level of the trellis based on the correlations at the preceding level of the trellis.

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Fred Halsall, Data Communications, Computer Networks and Open Systems, 4th ed., pp. 872-875, 1995.

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