Measured performance of a delay lock tracking loop when noise power exceeds signal power.
Hanratty, Joseph Michael.
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In the communications area there is a general interest in recovering signals which are below the noise level. In the military this interest translates to low-probability-intercept (LPI) and anti-jam (AJ) communications systems. The receiver improves the signal -to-noise ratio so data can be reliably recovered. This improvement is usually accomplished by matched -filtering or by correlation. In this report correlation is used as a post-detection processing technique to derive a synchronous reference. The system considered in this experiment can operate noncoherently by means of a delay lock tracking loop at signal-tonoise ratios as small as -5.0 to -7.1 dB. Futhermore, synchronization is achieved while the received signal is being modulated by data- No preamble or other type of synchronization is required.
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