Patent ID: 6212219
Filing Date: 2001-04-03
Classification: H04J

Abstract:
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; anda receiver for receiving the data, includinga 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, andtwo 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.