United States Patent m
Ovard et al.
[54] BEST-OF-M PULSE POSITION MODULATION DETECTOR
[75] Inventors: David Ovard, Meridian, Id.; Ryan N.
Jensen, Colorado Springs, Colo.
[73] Assignee: Omnipoint Corporation, Colorado Springs, Colo.
[21] Appl. No.: 468,802
[22] Filed: Jun. 6,1995
Related U.S. Application Data
[63] Continuation-in-part of Ser. No. 146,490, Nov. 1, 1993, abandoned.
[51] Int CI.6 H03K 7/04
[52] U.S. CI 375/239; 370/813
[58] Field of Search 375/239, 200,
375/204, 206, 340; 327/22, 23. 26, 27; 329/313; 332/112; 370/10, 8, 213
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US005666379A
[ii] Patent Number: 5,666,379 [45] Date of Patent: Sep. 9, 1997
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OTHER PUBLICATIONS
Unikauf, Manfred G., Surface Wave Devices in Spread Spectrum Systems, Surface Wave Filters (Wiley 1977), pp. 477-509.
Dixon, R., Spread Spectrum Systems with Commercial
Applications (J. Wiley & Sons, 3d ed. 1994).
Dixon, Robert C, Spread Spectrum Systems, (J. Wiley &
Sons, 2d ed. 1984).
Primary Examiner—Wellington Chin
Assistant Examiner—Congvan Tran
Attorney, Agent, or Firm—Lyon & Lyon LLP
[57] ABSTRACT
A pulse position modulation detector divides a timing window into a plurality of pulse position windows, determines the peak magnitude of a signal level received during each pulse position window, compares the peak magnitudes of the signal detected during each pulse position window to determine during which pulse position window the greatest peak magnitude is detected, and generates a bit sequence corresponding to the pulse position window wherein the greatest peak magnitude was detected within the current timing window.
18 Claims, 6 Drawing Sheets
