Multi-frequency differentially encoded digital communication for high data rate transmission through unequalized channels
March 6, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3485949 Multi-line, multi-mode modulator using bandwidth reduction for digital FSK and DPSK modulation Differential encoding and decoding scheme for digital transmission systems Symbols communication system Multidimensional channel coding Differentially nonlinear convolutional channel coding with expanded set of signalling alphabets Modulator-demodulator method and apparatus with efficient bandwidth utilization Transmitter/receiver system Multidimensional, convolutionally coded communication systems Ensemble modem structure for imperfect transmission media InventorApplicationNo. 490769 filed on 03/06/1990US Classes:375/244, Differential375/260Plural channels for transmission of a single pulse trainExaminersPrimary: Safourek, Benedict V.Assistant: Tse, Young T. Attorney, Agent or FirmInternational ClassesH03M 007/00H04L 027/10 AbstractA differentially encoded digital signal waveform is generated as a discrete time representation of a desired analog signal utilizing multi-frequency modulation techniques. The computational capability of present day, industry-standard microcomputers equipped with a floating point array processor or digital signal processor chip is utilized to perform digital frequency encoding and compute both discrete Fourier transforms and inverse discrete Fourier transforms to provide a transmitter and receiver system utilizing suitably programmed microcomputers coupled by a communications channel.Other References
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