Estimation of doppler frequency through autocorrelation of pilot symbols

摘要

A circuit coupled to receive a sequence of signals is designed with a multiplication circuit (416, 420) coupled to receive a first signal, a second signal and a complex conjugate of the first signal. The second signal follows the first signal in time. The multiplication circuit produces a first product sequence of the first signal and the complex conjugate and a second product sequence of the second signal and the complex conjugate. A summation circuit (424, 426) is coupled to receive the first product sequence and the second product sequence. The summation circuit produces a first sum of the first product sequence and a second sum of the second product sequence.