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. 11, 2005
Filed:
Dec. 22, 1998
Koichi Okawa, Yokohama, JP;
Koji Ohno, Yokohama, JP;
Mamoru Sawahashi, Yokohama, JP;
Shinji Uebayashi, Yokosuka, JP;
Yukihiko Okumura, Yokohama, JP;
Koichi Okawa, Yokohama, JP;
Koji Ohno, Yokohama, JP;
Mamoru Sawahashi, Yokohama, JP;
Shinji Uebayashi, Yokosuka, JP;
Yukihiko Okumura, Yokohama, JP;
NTT Mobile Communications Network, Inc., Tokyo, JP;
Abstract
A DS-CDMA transmission method capable of improving the accuracy of channel estimation using pilot symbols by eliminating cross-correlation between pilot symbols inserted into code channels in CDMA multiplexing carrying out fast signal transmission. In each frame assembler, the pilot symbols, which are used for channel estimation for coherent detection, are inserted into coded information data on code channels at fixed intervals, and then the data is modulated by the modulator. The modulated data symbols in each code channel from the modulator are spread by the spreading modulator, the pilot symbols are spread using a spreading code, whereas the information symbols are spread using different spreading codes assigned to respective code channels. The spread signals of the code channels are summed up by the adder to be transmitted.