Spread spectrum communication system
AssigneesYozan Inc., Sharp Kabushiki Kaisha
InventorsGuoliang Shou, Changming Zhou, Xuping Zhou, Makoto Yamamoto, Sunao Takatori
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Abstract
The present invention has an object to provide a spread spectrum communication system for heightening the speed of communication. The present invention transfers the first PN code sequence itself as the first component, adds and transfers zero or more instances of the second PN code sequence given a phase difference as the second component, and defines an information for transmitting by the number of the second PN codes corresponding to a cycle of said first PN code sequence.
Claims20
A spread spectrum communication system comprising:
- a transmitter for outputting data, including a first PN code sequence as a first component and a second PN code sequence shifted in phase from the first PN code sequence as a second component, so that information to be transmitted is defined by a phase difference between the first and second PN code sequences;
- and
- a receiver for receiving the data, including
- a first matched filter having a PN code sequence corresponding to the first PN code sequence for outputting a first peak when the first PN code sequence is received by said receiver, and
- two second matched filters having a PN code sequence corresponding to the second PN code sequence for alternatingly receiving at least a portion of the data and outputting a second peak when the second PN code sequence is received,
- wherein said two second matched filters each perform a different one of receiving at least a portion of the data and circulating the PN code sequence corresponding to the second PN code sequence, respectively,
- and wherein when said first matched filter outputs the first peak, said two second matched filters switch functions of circulating the PN code sequence corresponding to the second PN code sequence and receiving at least a portion of the data.
A spread spectrum communication system comprising a transmitter which transmits
- (A) a first PN code sequence as a first component and
- (B) an integrated signal of a predetermined number of second PN code sequences successively shifted as a second component,
- wherein said predetermined number is an integer greater than zero, and
- wherein an information to be transmitted is represented by said predetermined number.
A spread spectrum communication system comprising a transmitter which multiplexes
- (A) a first PN code sequence and
- (B) a second PN code sequence having the same cycle as said first PN code sequence,
- wherein said second PN code sequence is generated by adding a predetermined number of basic PN code sequences shifted in phase, and
- wherein said predetermined number is greater than zero, and
- wherein an information to be transmitted is represented at least in part by phase shifts of said predetermined number of basic PN code sequences with respect to said first PN code sequence.
A spread spectrum communication system comprising a transmitter which transmits
- (A) a first PN code sequence as a first component and
- (B) an integrated signal of a predetermined number of second PN code sequences successively shifted in phase as a second component,
- wherein said predetermined number is greater than zero, and
- wherein an information to be transmitted is represented at least in part by phase shifts of said predetermined number of second PN code sequences.
Dependencies are inferred from the claim text.