Receiver for DS-CDMA signals
First Claim
1. A receiver for receiving spread spectrum direct sequence code division multiple access signals (DS-CDMA) including a plurality of correlator channels each of which has a threshold level for determining when correlation between a received pseudo random noise (PRN) code from a given satellite and a locally generated PRN code has been achieved, said receiver further including means for assessing the correlation noise level, means for predicting the signal strength of the signal transmitted by the satellite whose code it is being attempted to correlate and means for setting the threshold level of each of the correlators to a value which is dependent on the correlation noise level and the predicted signal strength.
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Accused Products
Abstract
A receiver for direct sequence spread spectrum code division multiple access signals (DS-CDMA) particularly for GPS signals includes a plurality of correlators. Each correlator includes variable level threshold circuits (29, 30) which follow integrate and dump registers (27, 28). The threshold level is set using the correlation noise level and predicted signal strength.
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Citations
5 Claims
- 1. A receiver for receiving spread spectrum direct sequence code division multiple access signals (DS-CDMA) including a plurality of correlator channels each of which has a threshold level for determining when correlation between a received pseudo random noise (PRN) code from a given satellite and a locally generated PRN code has been achieved, said receiver further including means for assessing the correlation noise level, means for predicting the signal strength of the signal transmitted by the satellite whose code it is being attempted to correlate and means for setting the threshold level of each of the correlators to a value which is dependent on the correlation noise level and the predicted signal strength.
Specification