Patent ID: 6349109
Filing Date: 2002-02-19
Classification: H04B,H04J

Abstract:
Direct sequence spread spectrum differential receiver with mixed control signal formation means for the formation of an interference signal corresponding to the multiple access noise, said receiver comprising:a) a first channel for processing a first part (I) of the signal received, said first part being the part in phase with the carrier received, said first channel comprising: i) first matched filtering means (50(I) corresponding to a particular pseudorandom sequence, said first means supplying a first filtered signal (Ik), ii) first delay means (60(I)) supplying a first delayed, filtered signal (Ikâˆ’1), b) a second processing channel of a second part (Q) of the signal received, said second part being the part in phase quadrature with the carrier received, said second channel comprising: i) second matched filtering means (50(Q)) corresponding to said particular pseudorandom sequence, said second means supplying a second filtered signal (Qk), ii) second delay means (60(Q)) supplying a second delayed, filtered signal (Qkâˆ’1), c) a demodulation circuit (70) receiving the first filtered and delayed, filtered signals (Ik, Ikâˆ’1) and the second filtered and delayed, filtered signals (Qk, Qkâˆ’1) said circuit (70) comprising means for calculating a Dot signal equal to (IkIkâˆ’1+QkQkâˆ’1) and a Cross signal equal to (QkIkâˆ’1âˆ’IkQkâˆ’1), d) a circuit (80) for the integration and regeneration of the clock symbol (Hs) receiving the Dot and Cross signals and supplying a clock symbol signal (Hs), said receiver being characterized in that it also comprises:e) mixed control signal formation means, said mixed control signal being constituted by a clock signal (H) from the demodulation circuit and data (D(I), D(Q)) and amplitudes (A(I), A(Q)) from the first and second matched filtering means, f) a formation circuit (200) for the formation of an interference signal corresponding to the multiple access noise, said formation circuit being controlled by said mixed control signal.