Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1988-06-24
1989-10-03
Safourek, Benedict V.
Pulse or digital communications
Spread spectrum
Direct sequence
375 95, H04B 700
Patent
active
048721859
ABSTRACT:
In a signal transmission method, a sequence of equally distributed statistically uncorrelated symbols having a symbol duration T.sub.S is converted, in a transmitter, into a frequency baseband signal by means of a given CPM method, the frequency baseband signal is transmitted to a signal receiver by means of a carrier oscillation and the receiver is synchronized with respect to the frequency baseband signal. The signal receiver is synchronized in such a manner that, in a number N of time windows the starting times of which are displaced by an integral multiple of the symbol duration T.sub.S referred to a given reference time t.sub.R and the length of which in each case corresponds to the symbol duration T.sub.S, the frequency baseband signal is sampled in a number K of subintervals (1A, 1B, 1C, 2A, . . . ) per time window, dispers ions (.sigma..sub.A, .sigma..sub.B, .sigma..sub.C) are calculated for sampled values from subintervals (1A, 2A, 3A, . . . ) corresponding to one another and a sampling time T.sub. A is derived from the location of the smallest one of the dispersions in time. The N time windows are divided into two groups (1A, 1B, 1C, 3A, 3B, . . . ; 2A, 2B, 2C, 4A, 4B . . . ) and the dispersions (.sigma..sub.A, .sigma..sub.B, .sigma..sub.C) are separately determined for each group.
REFERENCES:
patent: 4379284 (1983-05-01), Boykin
patent: 4453259 (1984-06-01), Miller
Braun Walter
Habermann Joachim
BBC Brown Boveri AG
Safourek Benedict V.
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