Analysis of SCCL as a PN-code tracking loop

Author

Chen, Kwan-Cheng ; Davisson, Lee D.

Author_Institution

IBM Thomas J. Watson Res. Center, Yorktown Heights, NY, USA

Volume

42

Issue

11

fYear

1994

fDate

11/1/1994 12:00:00 AM

Firstpage

2942

Lastpage

2946

Abstract

We introduce the application of SCCL that is based on sample-correlate-choose-largest procedure as a coherent baseband PN-code tracking loop applying biphase-level signals. Three adjacent estimates are formed by correlating the samples of the baseband waveform for each bit. We choose the corresponding timing (phase) of the estimate with the largest magnitude as the current correct timing (phase) and update it for each bit. Only one summation circuit is required due to the digital realization of the SCCL. The correlation properties of the samples from maximum length codes using the biphase-level signal set are investigated. Tracking performance is theoretically analyzed in both steady-state and transient conditions via a finite-state Markov chain model. The numerical results demonstrate strong PN-code tracking characteristics of SCCL

Keywords

Markov processes; codes; correlation methods; parameter estimation; signal processing; spread spectrum communication; synchronisation; DS spread spectrum; PN-code tracking loop; SCCL; adjacent estimates; baseband waveform; biphase-level signals; coherent baseband tracking; correlation properties; finite-state Markov chain model; maximum length codes; phase estimation; sample-correlate-choose-largest procedure; steady-state conditions; summation circuit; timing; tracking performance; transient conditions; AWGN; Additive white noise; Baseband; Communication systems; Gaussian noise; Optical noise; Phase estimation; Spread spectrum communication; Timing; Tracking loops;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/26.328975

Filename

328975