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Effects of multiple-access interference on the noncoherent delay lock loop

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2 Author(s)
Caffery, J. ; Dept. of Electr. & Comput. Eng., Cincinnati Univ., OH, USA ; Stuber, G.L.

This paper presents a performance analysis of the noncoherent delay lock loop (NC-DLL) in the presence of multiple-access interference (MAI). A renewal theory approach is applied along with the more familiar linear theory. The effect of the MAI on performance is evaluated in terms of the mean-time-to-lose-lock and the root-mean-square (RMS) tracking error. The analysis is made tractable by approximating the aperiodic cross-correlation function between two pseudonoise (PN) code sequences. The results are compared with those which assume that the MAI can be approximated as Gaussian noise. As expected, the results indicate a drastic decrease in performance as the number of users in a system is increased. The effect of the near-far ratio, PN code sequence length, system load, and signal-to-noise ratio on the performance of the NC-DLL in MAI are also examined

Published in:

Communications, IEEE Transactions on  (Volume:48 ,  Issue: 12 )

Date of Publication:

Dec 2000

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