On the improvement of decision-directed channel estimation in DVB-T2 systems
Consumer Electronics(2013)
摘要
The DVB-T2 standard is widely used in recent years, which is based on orthogonal frequency division multiplexing (OFDM) systems. In OFDM system, frequency-domain pilots are usually employed to perform channel estimation. To reduce the number of pilots and hence improve spectral efficiency, decision-directed channel estimation (DDCE) has been considered in the new DVB-T2 standard. In this paper we will address the noise amplification problem of DDCE in DVB-T2 systems. We propose to employ the weighted least-squares method to improve the performance of DDCE in DVB-T2 systems. Simulation results show that the proposed scheme considerably improves the mean-squared estimation errors as compared with existing algorithms in [2,3].
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关键词
ofdm modulation,channel estimation,digital video broadcasting,estimation theory,mean square error methods,ddce,dvb-t2 systems,ofdm systems,decision directed channel estimation,digital video broadcasting - second generation terrestrial,mean squared estimation errors,noise amplification problem,orthogonal frequency division multiplexing systems,spectral efficiency,weighted least squares method,noise,ofdm,interpolation,vectors,modulation
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