Data transmission method, transmitter, and receiver

Details Data transmission method, transmitter, and receiver Data transmission method, transmitter, and receiver

1996-10-23

1999-08-24

Pham, Chi H.

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

370342, H04J 1300

Patent

active

059433302

ABSTRACT:
The invention relates to a transmitter, a receiver and a data transmission method in a CDMA cellular radio system comprising in each cell at least one base station (100) and a number of subscriber terminals (102-108), and in which method the base stations communicate with terminal equipments situated within their area by using an at least partly overlapping frequency band, and wherein the signal of each user is modulated with one or several pseudo-random sequences the bit rates of which are substantially higher than the symbol rates of the users. In order to simplify multirate transmission, the pseudo-random sequence set (202-206) to be allocated to each user is selected on the basis of the symbol information contained in the user signal and the information rate required, and the subset to be modulated is selected from said set on the basis of the symbols to be transmitted.

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K. Rikkinen: Comparison of very low rate coding methods for CDMA radio communications system, IEEE ISSTA Proceedings, Jul. 4-6, 1994, University of Oulu, Finland, pp. 268-272.

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