Navcom Technology, Inc.

Mark Philip Kaplan

Richard Kai-Tuen Woo

Jalal Alisobhani

Donald Leimer

Donald K Leimar

A communication device includes a transmitter and receiver. The transmitter includes an M-ary encoder configured to generate an M&minus;1 number of distinctive symbols each comprising k bits. M is equal to 2k and k is a positive integer. The transmitter also includes a code generator configured to produce spread spectrum codeword sequences based on the symbols generated by the M-ary encoder and based on a first and a second Gold code polynomials. The transmitter sends a radio signal based on the spread spectrum codeword sequences. The receiver is configured to receive the radio signal. The receiver includes a first shift register configured to receive an input signal generated based on the received radio signal and a second shift register configured to receive and circularly shift a locally generated codeword sequence that is identical to the codeword sequence used to encode the symbols.

Spread-spectrum GMSK/M-ary radio with oscillator frequency correction

A communication device includes a transmitter and receiver. The transmitter includes an M-ary encoder configured to generate an M&minus;1 number of distinctive symbols each comprising k bits. M is equal to 2 and k is a positive integer. The transmitter also includes a code generator configured to produce spread spectrum codeword sequences based on the symbols generated by the M-ary encoder and based on a first and a second Gold code polynomials. The transmitter sends a radio signal based on the spread spectrum codeword sequences. The receiver is configured to receive the radio signal. The receiver includes a first shift register configured to receive an input signal generated based on the received radio signal and a second shift register configured to receive and circularly shift a locally generated codeword sequence that is identical to the codeword sequence used to encode the symbols. The receiver also includes an accumulator coupled to the first and second shift registers and configured to multiply and accumulate stored values in the first and second shift registers each time the second shift register is circularly shifted and a selecting device coupled to the accumulator and configured to identify one symbol from the plurality of symbols based on outputs from the accumulator. A method corresponding to the device is also provided.

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Culver City, CA, United States of America

Mark Philip Kaplan