Effects of multipath fading on delay-locked loops for spread spectrum systems

@article{citeulike:2355243, abstract = {A renewal process approach is used to analyze noncoherent delay-locked loops (DLLs) for spread spectrum systems operating over frequency selective and frequency nonselective slow fading channels. The effects of multipath fading are evaluated in terms of the mean-time-to-lose-lock (MTLL) and the root-mean-square (RMS) tracking error. For channels that have a specular component, the following results are observed: (i) the effect of multipath fading is more significant for tracking loops that have large loop signal-to-noise ratios (SNRs); (ii) a smaller early-late discriminator offset \Δ, which is bounded by 0\<\Δ\<1, results a better tracking error performance. However, the tracking error is insensitive to \Δ, if there is a strong multipath fading effect and/or the tracking loops have small loop SNRs; (iii) a larger \Δ (\>0.5) may result in a higher MTLL, especially if there is a strong multipath effect. From (ii) and (iii), instead of using the popular choice of \Δ=0.5, a larger \Δ may be chosen for a DLL that works at low SNRs and/or strong multipath fading environments, where MTLL is an important consideration}, author = {Sheen, Wern-Ho and Stuber, G. L. }, booktitle = {Communications, IEEE Transactions on}, citeulike-article-id = {2355243}, doi = {10.1109/TCOMM.1994.582905}, journal = {Communications, IEEE Transactions on}, keywords = {cdma, delay, fading, loop, multipath, spread-spectrum}, number = {234}, pages = {1947--1956}, posted-at = {2008-02-09 00:52:20}, priority = {2}, title = {Effects of multipath fading on delay-locked loops for spread spectrum systems}, url = {http://dx.doi.org/10.1109/TCOMM.1994.582905}, volume = {42}, year = {1994} }

TY - JOUR ID - citeulike:2355243 L3 - citeulike-article-id:2355243 TI - Effects of multipath fading on delay-locked loops for spread spectrum systems T2 - Communications, IEEE Transactions on JF - Communications, IEEE Transactions on VL - 42 IS - 234 SP - 1947 EP - 1956 N2 - A renewal process approach is used to analyze noncoherent delay-locked loops (DLLs) for spread spectrum systems operating over frequency selective and frequency nonselective slow fading channels. The effects of multipath fading are evaluated in terms of the mean-time-to-lose-lock (MTLL) and the root-mean-square (RMS) tracking error. For channels that have a specular component, the following results are observed: (i) the effect of multipath fading is more significant for tracking loops that have large loop signal-to-noise ratios (SNRs); (ii) a smaller early-late discriminator offset Δ, which is bounded by 0<Δ<1, results a better tracking error performance. However, the tracking error is insensitive to Δ, if there is a strong multipath fading effect and/or the tracking loops have small loop SNRs; (iii) a larger Δ (>0.5) may result in a higher MTLL, especially if there is a strong multipath effect. From (ii) and (iii), instead of using the popular choice of Δ=0.5, a larger Δ may be chosen for a DLL that works at low SNRs and/or strong multipath fading environments, where MTLL is an important consideration KW - cdma KW - delay KW - fading KW - loop KW - multipath KW - spread-spectrum AU - Sheen, Wern-Ho AU - Stuber, GL PY - 1994/// UR - http://dx.doi.org/10.1109/TCOMM.1994.582905 ER -