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A technique to improve the performance of serial, matched-filter acquisition in direct-sequence spread-spectrum packet radio communications

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2 Author(s)
Arvind Swaminathan ; Holcombe Dept. of Electr. & Comput. Eng., Clemson Univ., SC, USA ; Noneaker, D.L.

In this paper we examine a simple method to improve the performance of serial, matched-filter acquisition indirect-sequence spread-spectrum packet radio communications. Each packet transmission includes an acquisition preamble, and the preamble sequence is changed at the boundaries of predefined time epochs based on a pseudorandom sequence generator. It is shown in previous work that the presence of an IF filter and the characteristics of the AGC subsystem, lead to a probability of not acquiring that is a non-monotonic function of the signal-to-noise ratio if the acquisition algorithm uses a threshold-crossing detector with a fixed threshold. The acquisition algorithm presented in this paper employs an estimator to adaptively select the acquisition threshold. It is shown that this technique reduces the severity of the non-monotonicity and substantially improves the acquisition performance.

Published in:

Communications, 2003. ICC '03. IEEE International Conference on  (Volume:4 )

Date of Conference:

11-15 May 2003