The algorithm has advantages of low complexity,wide estimation range, good accuracy,moreover,the algorithm is robust to noise and can provide real-time estimation due to averaging processing.The presented algorithms in this paper is based on a channel estimation Lacoste Polo Shirts auto-correlation function,that is to say,the auto-correlation function of time domain impulse response meets the 0th order Bessel function of the first kind,and the Doppler value can be educed by the lace wedding dresses Bessel inverse function.According to the characteristics of the DTMB system,during the algorithm design,firstly time domain channel estimates are obtained by a channel 12hot cheap prom dresses estimation module,followed by the auto-correlation calculation and normalization of channel estimates over several OFDM symbols,then the averaging processing is carried out to reduce the noise interference,finally the Doppler estimates are got using the LUT implementation of Bessel inverse function.Simulation results show that the proposed Doppler spread estimator can provide relatively high plus size wedding dresses estimation accuracy for a wide range of Doppler spread in a typical urban(TU) reception environment with six Rayleigh fading multi-paths and is robust to varying SNR values.Meanwhile,the new shoes 2010 receiver system with the proposed estimator also shows a significantly better cheap shoes blog 2010 performance than the system without it.Moreover,as the channel auto-correlation is computed using the channel estimates over the known fields of OFDM symbols,so the proposed algorithms can also be applied directly into other OFDM systems with known pilot symbols inserted within the data fields.
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