Implementation of code tracking loop for PCS system

Author

Jeong, Young Gyun ; Kim, Jin Su ; Kim, Myoung Jin

Author_Institution

Electron. & Telecommun. Res. Inst., Taejon, South Korea

fYear

1996

fDate

18-21 Nov 1996

Firstpage

49

Lastpage

52

Abstract

In spread spectrum systems PN code tracking is a crucial element in system performance. This paper describes design and implementation of a code tracking and data demodulation module for wideband CDMA PCS system using FDDLL technique. We have implemented code tracking and data demodulation module using FPGA and DSP to facilitate flexible change of system parameters. Operation of the proposed code tracking loop is analyzed numerically over AWGN channel. Expected value of the discriminator output yields an S-curve. Timing simulation of the proposed system is performed to verify proper operation. The implemented code tracking and data demodulation module operates at 4.096 MHz PN code rate. In loop-back call test, reconstructed speech shows toll quality

Keywords

Gaussian channels; code division multiple access; delay circuits; demodulation; digital communication; field programmable gate arrays; land mobile radio; personal communication networks; pseudonoise codes; spread spectrum communication; timing; tracking; 4.096 MHz; AWGN channel; DSP; FDDLL technique; FPGA; PCS system; PN code tracking; code tracking loop; data demodulation module; full digital delay locked loop; spread spectrum systems; timing simulation; wideband CDMA PCS system; AWGN channels; Demodulation; Digital signal processing; Field programmable gate arrays; Multiaccess communication; Personal communication networks; Spread spectrum communication; System performance; Tracking loops; Wideband;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1996., IEEE Asia Pacific Conference on

Conference_Location

Seoul

Print_ISBN

0-7803-3702-6

Type

conf

DOI

10.1109/APCAS.1996.569216

Filename

569216