| 摘要 |
<p>A transmitter interleaves a first pseudo-noise sequence with a second pseudo-noise sequence to provide a third pseudo-noise sequence which is transmitted and received by a receiver. An XOR of the two sequences produces a third, known-valid pseudo-noise sequence. The receiver further correlates the third pseudo-noise sequence to provide a measure of a frequency of the transmitted signal. The receiver further downconverts and filters the received signal to provide a filtered complex signal. A complex multiplier generates a complex multiplication of the filtered complex signal with a delayed version of the filtered complex signal to provide a product. The delayed version of the filtered signal is delayed by a chip period. A correlator correlates the product to provide the measure of frequency. The first sequence or the second sequence is a reference signal embedded within the information-bearing signal to aid the receiver in detection.</p> |
