Effects of fading and data modulation on noncoherent m-sequence acquisition schemes
By: Patrick J Vincent
Contributors: Naval Postgraduate School (U.S.)
Publisher: Naval Postgraduate School
Published: 1992
Place of publication: Monterey, Calif
Language: eng
Number of pages: 101
Subjects: Communication; Spread spectrum communications; Data processing
Description: In direct-sequence spread-spectrum systems, successful communications require phase synchronization of the m-sequence in the incoming signal with a locally generated m-sequence at the receiver. Many acquisition schemes which extract the phase of an incoming m-sequence have been studied, but most of them assume coherent demodulation (which is usually not available during acquisition) and or independent samples (which introduce a loss in the effective signal to noise ratio (SNR)). This thesis investigates the performance of two m-sequence acquisition schemes in the presence of fading and data modulation. A fixed sample size test and a truncated sequential test are studied without the usual assumptions of coherent demodulation or independent samples. The effects of fading and data modulation on our schemes' probability of false alarm, probability of detection and test length are thoroughly explored. We find that channel fading in effect induces a loss of signal SNR, but the desired power of the tests can be restored by suitable adjustments in the decision processor. We find that the effects of data modulation are less severe, but more problematic to correct.
Notes: Thesis advisor: Lam, Alex W.

"March 1992."

Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, March 1992.

Includes bibliographical references (p. 98-100).

"Approved for public release; distribution is unlimited"--Cover.

US Navy (USN) author.

ck/ 2/4/09.