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AssigneeAirbus Defence and Space GmbH
InventorsAndrew RICHARDSON, Michael TURNER, David De-Castro GALAN, Michael BATISITE
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Apparatus and methods are disclosed for obtaining a correlation function between a Direct Sequence Spread Spectrum (DSSS) signal and a spreading code. A plurality of code replica samples are stored in memory at a relatively low sampling rate compared to the sampling rate at which the input DSSS signal is sampled. A correlation operator is obtained by reproducing the stored code replica samples, in order to obtain a correlation operator with the same number of samples as the block of DSSS signal samples currently being processed. For example, when the sampling rate of the DSSS signal is equal to an integer N multiple of the sampling rate used for the code replica samples, the stored replica samples are reproduced N times to obtain the correlation operator. The correlation operator is then multiplied by the block of DSSS signal samples and integrated to obtain a correlation function.
Apparatus for calculating a correlation function between a Direct Sequence Spread Spectrum DSSS signal and a spreading code, the apparatus comprising:
A method of calculating a correlation function between a Direct Sequence Spread Spectrum DSSS signal and a spreading code using a plurality of code replica samples, the code replica samples comprising samples of a complex conjugate of a time-to-frequency domain transformed replica of the spreading code obtained at a first sampling rate, the method comprising:
Dependencies are inferred from the claim text.