CDMA communication method, CDMA transmitter and CMDA receiver

Details CDMA communication method, CDMA transmitter and CMDA receiver CDMA communication method, CDMA transmitter and CMDA receiver

1997-06-19

1999-07-20

Patel, Ajit

Multiplex communications

Communication over free space

Combining or distributing information via code word channels...

370350, 370515, 375200, 375367, H04B 7216

Patent

active

059264713

ABSTRACT:
For a CDMA communication system using an interference canceller, a communication system which enables the interference canceller to easily confirm pulling-in of its own signal is disclosed. Input transmission signals are stored through a serial-parallel converter 101 in storage circuits 301 and 302, each of which holds one frame of transmission signals for I and Q axes. An area for holding one cycle of spreading codes for the I and Q axes output from a spreading code generator 105 is formed in the rearmost part of each of the transmission data strings of the storage circuits 301 and 302. One frame of transmission signals prepared by a pilot inserting device 102 and frame synchronizing signals are transferred to a transmitted circuit 103 in sequence. These signals are then transmitted as data for the I and Q axes by symbol rate clocks. The data for the I and Q axes are multiplied by chip rate spreading codes output from a spreading code generator 105, a spreading code for the I axis and a spreading code for the Q axis in a spreader 104 and then output as spread spectrum signals.

REFERENCES:
patent: 5359624 (1994-10-01), Lee
patent: 5619491 (1997-04-01), Panzer
patent: 5673260 (1997-09-01), Umeda
patent: 5748623 (1998-05-01), Sawahashi

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