No abstract

No abstract

Presented here are techniques for generating desired gray codes with properties different from those of the standard binary reflected gray code. For communications using phase shift-keyed (PSK) signals with different significances for different phases, it is desirable to have such codes with different bit error probabilities. For some applications, it is important to have codes with arbitrary crossover Hamming distances. These techniques are suitable for generating codes with either or both of these properties. The codes generated may be far longer than those generated by current computer search techniques.

A microcomputer-based programmable optical correlator (MPOC) is proposed for automatic pattern recognition and identification. A programmable magneto-optic spatial light modulator and a liquid-crystal light value are used to perform a real-time joint-transform correlation operation. Since the proposed MPOC consists of a microcomputer and an optical processing system, it has the advantage of real-time programmable processing capability for large space-bandwidth-product information. The basic theory and a feasibility study of the technique are given.

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