Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Patent
1997-05-29
2000-08-01
Nguyen, Chau
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
370491, H04B 7216, H04B 310, H04J 116
Patent
active
060977116
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.
REFERENCES:
patent: 5442625 (1995-08-01), Gitlin et al.
patent: 5442662 (1995-08-01), Fukasawa et al.
patent: 5515396 (1996-05-01), Dalekotzin
patent: 5533013 (1996-07-01), Leppanen
patent: 5715236 (1998-02-01), Gilhousen et al.
patent: 5790588 (1998-08-01), Fukawa et al.
patent: 5805583 (1998-09-01), Rakib
patent: 5822359 (1998-10-01), Bruckert et al.
patent: 5850393 (1998-12-01), Adachi
European Search Report (in English) for European Patent Application No. 97303705.4 dated Jun. 7, 1999.
IEICE Trans. Commun., vol. E79-B, No. 9, Sep., 1996, "Coherent Multicode DS-CDMA Mobile Radio Access", Fumiyuki Adachi, Koji Ohno, Akihiro Higashi, Tomohiro Dohi and Yukio Okumura.
Ohno Koji
Okawa Koichi
Okumura Yukihiko
Sawahashi Mamoru
Uebayashi Shinji
Nguyen Chau
Nguyen Phuongchau Ba
NTT Mobile Communications Network Inc.
LandOfFree
DS-CDMA transmission method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with DS-CDMA transmission method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and DS-CDMA transmission method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-670750