CDMA cellular radio transmission system

Details CDMA cellular radio transmission system CDMA cellular radio transmission system

1997-03-13

2000-02-22

Pham, Chi H.

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

370514, 375200, 375325, H04B 1500

Patent

active

060288523

ABSTRACT:
A base station transmits, in addition to a pilot channel, signals which are multiplexed with pilot symbols inserted in the respective signals in communication channels. As the transmission of the pilot channel as a reference signal for coherent detection is unnecessary with high power so as to attain high reliability, the pilot channel can be transmitted with low power by means of weight in comparison with the communication channel, so that interference with the communication channel of any other station is reduced. Moreover, accurate coherent detection can be made from the pilot symbol inserted in the communication channel on the mobile station side.

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Seiichi Sampei, "Rayleigh Fading Compensation Method for 16QAM Modem in Digital Land Mobile Radio Systems" JECS Paper B-11, vol. J72-B-II, No. 1, pp. 7-15, 1989.
Akihiro Higashi et al. "Performance of Coherent RAKE Detection using Interpolation on DS/CDMA" JECS Technical Paper RCS94-98, 1994.

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