相干DLL码跟踪和误码率对宽带DS-CDMA反向链路QPSK解调的影响

VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI:10.1109/VETEC.1998.686190

H. Oh

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引用次数: 3

摘要

提出了一种新的用于宽带DS-CDMA反向链路QPSK解调的导频辅助延时锁环(PADLL)相干码跟踪方案。当应用非相干DLL时，由于平方损耗，它会遭受定时抖动的退化。推导了AWGN中PADLL的定时抖动公式，并与非相干DLL跟踪方案进行了比较。分析表明，与非相干码跟踪相比，该累积周期为4个符号的PADLL方案将QPSK解调性能提高了0.6 dB。

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

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.

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VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)

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