Spread spectrum communication apparatus
AssigneeCanon Kabushiki Kaisha
InventorsYasuyuki Arai, Tetsuo Kanda
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Abstract
A communication apparatus for code-division multiplexing a transmission path includes a spread spectrum transmitter and receiver. The spread spectrum transmitter includes a code-division multiple signal generator, a non-linear code-division multiple signal converter, and a transmitter for transmitting the converted signal. The code-division multiple signal is converted so that the transmitted signal has a plurality of amplitude values. The spread spectrum receiver includes a code-division multiple signal receiver, a non-linear converter for converting an amplitude of the received code-division multiple signal, and a de-spreader for de-spreading the non-linearly converted code-division multiple signal.
Claims28
A spread spectrum transmission apparatus comprising:
- generating means for generating a code-division multiple signal;
- conversion means for non-linearly converting the code-division multiple signal;
- and
- transmission means for transmitting a transmission signal corresponding to the code-division multiple signal converted by said conversion means,
- wherein said converting means converts the code-division multiple signal so that the transmission signal has a plurality of amplitude values.
A spread spectrum reception apparatus comprising:
- reception means for receiving a code-division multiple signal;
- conversion means for non-linearly converting an amplitude of the code-division multiple signal;
- and
- de-spreading means for de-spreading the code-division multiple signal converted by said conversion means.
A spread spectrum reception apparatus comprising:
- reception means for receiving a code-division multiple signal;
- integration means for integrating the code-division multiple signal;
- subtraction means for subtracting an output of said integration means from the code-division multiple signal;
- and
- non-linear calculation means for non-linearly calculating an output of said subtraction means.
A spread communication system comprising:
- a transmission apparatus having generation means for generating a code-division multiple signal, first conversion means for non-linearly converting an amplitude of the code-division multiple signal, and transmission means for transmitting the code-division multiple signal converted by said first conversion means;
- and
- a reception apparatus having means for receiving the transmitted code-division multiple signal, second conversion means for non-linearly converting an amplitude of the code-division multiple signal transmitted by said transmission means, and de-spreading means for de-spreading the code-division multiple signal converted by said second conversion means.
A spread spectrum transmission method comprising the steps of:
- generating a code-division multiple signal;
- non-linearly converting the code-division multiple signal;
- and
- transmitting a transmission signal corresponding to the code-division multiple signal converted in said conversion step,
- wherein the code-division multiple signal is converted in converting step so that the transmission signal transmitted in said transmission step has a plurality of amplitude values.
A spread spectrum reception method comprising the steps of:
- receiving a code-division multiple signal;
- non-linearly converting an amplitude of the code-division multiple signal;
- and
- de-spreading the code-division multiple signal converted in said conversion step.
Dependencies are inferred from the claim text.