Coherent DLL code tracking and BER effect on QPSK demodulation in wideband DS-CDMA reverse link

Author

Oh, Hyun-Seo

Author_Institution

Dept. of Mobile Commun. Syst. Eng., Electron. & Telecommun. Res. Inst., South Korea

Volume

3

fYear

1998

fDate

18-21 May 1998

Firstpage

2408

Abstract

In this paper, a novel coherent code tracking scheme called as pilot-aided delay locked loop (PADLL) for QPSK demodulation in wideband DS-CDMA reverse link is proposed. When noncoherent DLL is applied, it suffers from the timing zitter degradation due to squaring loss. The timing zitter formula for PADLL in AWGN is derived and compared with the noncoherent DLL tracking scheme. The analysis shows that the proposed PADLL scheme with the accumulation period of 4 symbols improves the performance of QPSK demodulation by 0.6 dB over the noncoherent code tracking

Keywords

AWGN; code division multiple access; delay lock loops; demodulation; error statistics; land mobile radio; pseudonoise codes; quadrature phase shift keying; timing jitter; tracking; AWGN; BER effect; PN code; QPSK demodulation; accumulation period; coherent code tracking scheme; noncoherent code tracking; pilot-aided delay locked loop; timing zitter; wideband DS-CDMA reverse link; AWGN; Bit error rate; Degradation; Delay; Demodulation; Multiaccess communication; Quadrature phase shift keying; Timing; Tracking loops; Wideband;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 1998. VTC 98. 48th IEEE

Conference_Location

Ottawa, Ont.

ISSN

1090-3038

Print_ISBN

0-7803-4320-4

Type

conf

DOI

10.1109/VETEC.1998.686190

Filename

686190