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:
Jan. 31, 2006
Filed:
Jun. 20, 2000
Naganori Shirakata, Suita, JP;
Tomohiro Kimura, Hirakata, JP;
Koichiro Tanaka, Takaraduka, JP;
Hideki Nakahara, Kyoto, JP;
Yasuo Harada, Kobe, JP;
Shuya Hosokawa, Neyagawa, JP;
Naganori Shirakata, Suita, JP;
Tomohiro Kimura, Hirakata, JP;
Koichiro Tanaka, Takaraduka, JP;
Hideki Nakahara, Kyoto, JP;
Yasuo Harada, Kobe, JP;
Shuya Hosokawa, Neyagawa, JP;
Matsushita Electric Industrial Co., Ltd., Osaka-Fu, JP;
Abstract
An apparatus and method for OFDM demodulation establish symbol synchronization to minimize between-symbol interference even under an environment where multipath occurs. An incoming signal is an OFDM signal including a transmission symbol structured by a valid symbol period and a guard interval, and a predetermined synchronization symbol is included in the OFDM signal for every transmission frame. A correlator calculates how a signal generated by a synchronization symbol generator and the OFDM signal are correlated. A correlation calculator then calculates a correlation therefrom. An integrator integrates the calculated correlation by the guard interval. A timing determination device determines symbol timing from the integrated correlation. An FFT window generator outputs operation timing for Fourier transform from the determined symbol timing. Based on the signal outputted from the FFT window generator, the apparatus for OFDM demodulation extracts a signal in the valid symbol period from the transmission symbol for demodulation.