Up-link access apparatus in direct sequence code division multip

Details Up-link access apparatus in direct sequence code division multip Up-link access apparatus in direct sequence code division multip

1994-12-27

1997-02-18

Olms, Douglas W.

Multiplex communications

Communication over free space

Combining or distributing information via code word channels...

375206, H04J 1304

Patent

active

056047320

ABSTRACT:
Disclosed is a link access apparatus of a CDMA system using a DS/SS communication method, and more particularly an up-link access apparatus which overcomes a near/far problem occurring when mobile stations and a base station perform multiple access communication using code division. An up-link access apparatus in a DS/SS-CDMA system has a transmitter for mixing data to be transmitted to a base station with a PN code unique to that mobile station to thereby PN code modulate the data. The transmitter then mixes the PN code modulated data with a carrier having a frequency that is shifted by an identification frequency to thereby output a spread spectrum signal. The apparatus further includes a receiver for mixing a demodulation carrier made up of the PN code and the identification frequency with the spread spectrum signal from the transmitter to thereby output a mixed signal. The mixed signal is then integrated according to a period having a reciprocal corresponding to the identification frequency, demodulated and output as a digital signal.

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