초록 ▼

A data transmitter and receiver in a DS-CDMA communication system designed to prevent a serious amplitude shift in a transmission signal, facilitate recovery of data and clock signals and relieve the constraint of using a high linearity, high performance amplifier. The data transmitter includes a sp

A data transmitter and receiver in a DS-CDMA communication system designed to prevent a serious amplitude shift in a transmission signal, facilitate recovery of data and clock signals and relieve the constraint of using a high linearity, high performance amplifier. The data transmitter includes a spread signal generating device, in which I-arm and Q-arm information signals of the first channel are spread by I-arm and Q-arm PN codes, respectively, and I-arm and Q-arm information signals of a predetermined number of following channels are spread by an inverted Q-arm PN code and the I-arm PN code, respectively. The data receiver includes a despread signal generating device, in which an I-arm despread signal is generated by multiplying I-arm and Q-arm digital baseband spread signals by I-arm and Q-arm PN codes, respectively, and adding the multiplication results, while a Q-arm despread signal is generated by multiplying Q-arm and I-arm digital baseband spread signal by an inverted I-arm PN code and the Q-arm PN code, respectively, and adding the multiplication results.

대표청구항 ▼

[ What is claimed is:] [1.]1. A spread signal generating device in a spread spectrum communication system for transmitting an information signal through a plurality of channels, comprising:means for generating I-arm and Q-arm pseudo-random noise codes, and an inverted Q-arm pseudo-random noise code;

[ What is claimed is:] [1.]1. A spread signal generating device in a spread spectrum communication system for transmitting an information signal through a plurality of channels, comprising:means for generating I-arm and Q-arm pseudo-random noise codes, and an inverted Q-arm pseudo-random noise code;a first multiplier for multiplying an information signal of a first channel among a plurality of channels by the I-arm pseudo-random noise code;a second multiplier for multiplying the information signal of the first channel by the Q-arm pseudo-random noise code;a first plurality of multipliers for respectively multiplying information signals of other channels by the inverted Q-arm pseudo-random noise code;a second plurality of multipliers for respectively multiplying the information signals of other channels by the I-arm pseudo-random noise code;a first adder for adding the multiplication results of the first multiplier and the first plurality of multipliers to produce an I-arm spread spectrum signal; anda second adder for adding the multiplication results of the second multiplier and the second plurality of multipliers to produce a Q-arm spread spectrum signal.