TY - JOUR
T1 - On Optimal AGC Structure for Direct Sequence Spread Spectrurn PN-Code Tracking
AU - Welti, Arnold L.
AU - Bobrovsky, Ben Zion
PY - 1994
Y1 - 1994
N2 - The performance of various AGC configurations namely presyne postsync and an adaptive (optimal) AGC are analyzed at and above threshold for a coherent pseudonoise (PN) second-order code tracking loop (delay lock loop, DLL) used in direct sequence spread spectrum systems. At and near threshold the criterion of performance is chosen to be the mean time to lose lock (MTLL). Applying a recently presented method, analytic expressions for the loop performance are given, and the threshold degradation caused by Doppler rate is derived. Above threshold, the “worst case” steady state tracking error is chosen as the loop index of performance. The performance and structure of the “globally-optimal” AGC (at and above threshold region) is derived, and a simplified, practical and still close to optimum adaptive AGC is presented. This configuration can easily be realized by digitally controlling the AGC parameters.
AB - The performance of various AGC configurations namely presyne postsync and an adaptive (optimal) AGC are analyzed at and above threshold for a coherent pseudonoise (PN) second-order code tracking loop (delay lock loop, DLL) used in direct sequence spread spectrum systems. At and near threshold the criterion of performance is chosen to be the mean time to lose lock (MTLL). Applying a recently presented method, analytic expressions for the loop performance are given, and the threshold degradation caused by Doppler rate is derived. Above threshold, the “worst case” steady state tracking error is chosen as the loop index of performance. The performance and structure of the “globally-optimal” AGC (at and above threshold region) is derived, and a simplified, practical and still close to optimum adaptive AGC is presented. This configuration can easily be realized by digitally controlling the AGC parameters.
UR - http://www.scopus.com/inward/record.url?scp=0028378184&partnerID=8YFLogxK
U2 - 10.1109/TCOMM.1994.577096
DO - 10.1109/TCOMM.1994.577096
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AN - SCOPUS:0028378184
SN - 1558-0857
VL - 42
SP - 680
EP - 688
JO - IEEE Transactions on Communications
JF - IEEE Transactions on Communications
IS - 234
ER -