Title :
Coherent DLL code tracking and BER effect on QPSK demodulation in wideband DS-CDMA reverse link
Author_Institution :
Dept. of Mobile Commun. Syst. Eng., Electron. & Telecommun. Res. Inst., South Korea
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;
Conference_Titel :
Vehicular Technology Conference, 1998. VTC 98. 48th IEEE
Conference_Location :
Ottawa, Ont.
Print_ISBN :
0-7803-4320-4
DOI :
10.1109/VETEC.1998.686190
