Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1983-05-23
1986-06-17
Safourek, Benedict V.
Pulse or digital communications
Spread spectrum
Direct sequence
370106, 364575, H04B 710
Patent
active
045960240
ABSTRACT:
Received data signals in digital form are sampled a plurality of times during each bit interval and weighted to enhance the statistical effect of a predetermined intermediate amplitude range prior to accumulation over a bit time to obtain an initial average indication of bit value. Plural repetitions of the same bit received at different times are similarly processed and the averages weighted according to received signal strength at the time of reception. Then the weighted averages are accumulated in a two's complement arithmetic fashion so that the accumulation sign bit binary signal state indicates the binary value of the bit. In one embodiment, the initially derived multiple samples of each bit are converted to in-phase and quadrature-phase versions prior to the sample accumulation step; and the separate accumulations of each version are utilized to obtain an arctangent value for adjusting the phase of a local clock to that of the received data.
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William C. Jakes, Jr., "Microwave Mobile Communications", John Wiley Son, N.Y., London, 1974, pp. 390-395.
AT&T Bell Laboratories
Chin Stephen
Phelan Charles Scott
Safourek Benedict V.
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