Threshold detector for digital radio transmission systems, devic

Details Threshold detector for digital radio transmission systems, devic Threshold detector for digital radio transmission systems, devic

1994-09-09

1996-07-02

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375317, 375340, 375367, 370 18, H04B 1500, H04K 100, H04L 2730

Patent

active

055330479

ABSTRACT:
A threshold detector for digital signal transmission systems using a transmission channel, in particular for transmission to mobiles, calculates a set of coefficients f.sub.n belonging to the group comprising a set of coefficients c.sub.n of the correlation between a first series of digital samples x.sub.n received by the receiver and a second series of reference digital samples p.sub.n known to the receiver, in order to acquire synchronization of the system, and a set of coefficients h.sub.n of an estimate of the impulse response of the transmission channel, when the system is already synchronized. It also calculates a decision variable A such that: ##EQU1## where L and N are predetermined integers. The device has many applications in mobile radio systems, for example for acquisition of synchronization in DS-CDMA systems or for optimizing the transmission channel estimate.

REFERENCES:
patent: 5151926 (1992-09-01), Chennakeshu et al.
patent: 5251233 (1993-10-01), Labedz et al.
patent: 5272446 (1993-12-01), Chalmers et al.
patent: 5432821 (1995-07-01), Polydoros et al.
Cahn, "Performance of Digital Matched Filter Correlator with Unknown Interference", IEEE Transactions On Communication Technology, vol. Com-19, No. 6 Dec. 1971, pp. 1163-1172.

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