The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 07, 2007
Filed:
Feb. 05, 2002
Isao Takeuchi, Tokyo, JP;
Isao Takeuchi, Tokyo, JP;
Sony Corporation, , JP;
Abstract
A transmitter transmits a quadrature modulated signal including transmission data as an I component and a known PN sequence as a Q component. The signal is received by a receiver which separates the signal into a real part and an imaginary part, and then is supplied to an equalizer and also to an I correlation circuit and a Q correlation circuit. In the meantime, a PN sequence identical with the PN sequence of the transmitter is generated by a generator, and then supplied to the I correlation circuit and the Q correlation circuit. The I correlation circuit and the Q correlation circuit determine a ratio and a time difference between a leakage component of the Q component leaking to an I channel and the Q component formed by a direct wave, and a ratio and a time difference between the Q component formed by an indirect wave and the Q component formed by the direct wave in a Q channel, respectively, on the basis of the real part, the imaginary part, and the PN sequence supplied to the I correlation circuit and the Q correlation circuit. The equalizer adaptively equalizes by the data obtained by the I correlation circuit and the Q correlation circuit.