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Noise Reduction for Channel Estimation Based on Pilot-Block Averaging in DVB-T Receivers
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- Authors
- You Seok Lee, Hyoung Nam Kim, Sung Ik Park, Soo In Lee
- Issue Date
- 2006-02
- Citation
- IEEE Transactions on Consumer Electronics, v.52, no.1, pp.51-58
- ISSN
- 0098-3063
- Publisher
- IEEE
- Language
- English
- Type
- Journal Article
- Abstract
- This paper proposes a noise-reduction method to improve the channel-estimation performance in Digital Video Broadcasting-Terrestrial (DVB-T) receivers. In DVB-T, the channel estimation is carried out through two processes of pilot signal estimation and channel coefficient interpolation and thus the performance of the channel estimation is seriously affected by the accuracy of the interpolation. Since the accuracy of the interpolation depends on signal-to-noise ratio, it is important to reduce noise existing at the reference coefficients for the interpolation. To achieve the reduction of noise, we use pilot-insertion type approximation in four consecutive OFDM symbols, which construct one block with the same channel coefficients at the same pilot positions. Considering the fade rate of channels, we average the estimated reference channel coefficients corresponding to the same subcarriers in two or more blocks. Computer simulation shows that the proposed method improves the estimation performance by more than 1 dB in terms of the symbol error rate obtained after equalization. © 2006 IEEE.
- KSP Keywords
- Channel Coefficients, Channel estimation(CE), Computer simulation(MC and MD), Noise reduction(NR), Noise-reduction method, Pilot signal, Reduction of noise, Signal noise ratio(SNR), Signal-to-Noise, Symbol error rate(SER), digital video broadcasting-terrestrial(DVB-T)