Data transmitter and receiver of a spread spectrum communication system using a pilot channel

a technology of spread spectrum communication system and data transmitter, which is applied in the direction of orthogonal multiplex, multi-component code generation, electrical apparatus, etc., can solve the problems of weak system, complex circuitry, and difficulty in adjusting the synchronization of pn code at the receiving side, so as to minimize the pn code acquisition time, simplify the synchronization process, and spread the effect of spectrum
USRE38603E1Inactive Publication Date: 2004-09-28SAMSUNG ELECTRONICS CO LTD
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Patent Information

Authority / Receiving Office
US Β· United States
Patent Type
Patents(United States)
Current Assignee / Owner
SAMSUNG ELECTRONICS CO LTD
Publication Date
2004-09-28
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

An improved spread spectrum communication system includes a transmitter and a receiver utilizing a pilot channel for the transmission of pure rather than modulated PN codes for code acquisition or tracking purposes with a lower bit error rate. The pilot signal is used to obtain initial system synchronization and phase tracking of the transmitted spread spectrum signal. At the transmitter side, a Walsh code generator, a Walsh modulator, a first PN code generator, a first band spreader, a second band spreader, finite impulse response filters, digital-analog converters, low-pass filters, an intermediate frequency mixer, a carrier mixer, a band-pass filter are used to transmit a spread spectrum signal. At the receiver side, a corresponding band-pass filter, a carrier mixer, an intermediate-frequency mixer, low-pass filters, analog-digital converters, a second PN code generator, an I channel despreader, a Q channel despreader, a PN code synchronization controller, a Walsh code generator, a first Walsh demodulator, a second Walsh demodulator, accumulator & dump circuits, a combiner, and a data decider are used to demodulate a received spread spectrum signal
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Description

CROSS-REFERENCE TO RELATED APPLICATIONSThis application makes reference to, incorporates the same herein, and claims all benefits accruing under 35 U.S.C. .sctn.119 from an application for Data Transmitter And Receiver Of A Spread Spectrum Communication System Using a Pilot Channel earlier filed in the Korean Industrial Property Office on 22 Nov. 1994 and assigned Ser. No. 30743 / 1994.BACKGROUND OF THE INVENTION1. Technical FieldThe present invention relates to a spread spectrum communication system, and more particularly to data transmitter and receiver of the spread spectrum communication system using a pilot channel.2. Background ArtConventionally, narrow band modulation systems (such as for example, amplitude modulation, frequency modulation and phase shift key modulation) have been used in the field of data communication. With such systems, demodulation at the receiver can be achieved with a relatively small amount of circuitry. Such systems, however, are weak due to multipath f...

Claims

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