| 摘要 |
A system ( 100 ) and method for the reception and despreading of a code-division multiple access (CDMA) global positioning system (GPS) signal ( 200 ), or other direct-sequence spread-spectrum (DSSS) signals, is provided. An antenna array ( 102 ) receives the DSSS signal ( 200 ) over a plurality of elements ( 116 ). A preprocessor ( 104 ) down converts and digitizes the DSSS signal ( 200 ) to produce a signal stream ( 202 ) in the time domain. An FFT ( 106 ) transforms the signal stream ( 202 ) to the frequency domain. A beam former ( 108 ) generates a reception beam ( 201 ) for the DSSS signal ( 200 ) in the frequency domain, and also implements a narrowband frequency notch, if desired. A despreader ( 110 ) despreads the transformed signal stream ( 204 ) in the frequency domain. An IFFT ( 112 ) transforms the despread signal stream ( 208 ) back to the time domain. And a postprocessor ( 114 ) converts the transformed despread signal stream ( 210 ) into a desired received signal stream ( 212 ) in the time domain.
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