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Coded Decision-Directed Channel Estimation for Coherent Detection in Terrestrial DMB Receivers
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- Authors
- Wan-Jin Kim, Young-Jun Lee, Hyoung-Nam Kim, Hyoung Soo Lim, Jong Soo Lim
- Issue Date
- 2007-05
- Citation
- IEEE Transactions on Consumer Electronics, v.53, no.2, pp.319-326
- ISSN
- 0098-3063
- Publisher
- IEEE
- Language
- English
- Type
- Journal Article
- Abstract
- This paper proposes a coded decision-directed (DD) channel-estimation method with two-dimensional averaging for T-DMB receivers. Since the noncoherent differential demodulation of existing T-DMB receivers can not track channel variation, it may not work well in fast-fading channels. To overcome this problem, coherent detection based on channel estimation is introduced. The proposed method remodulates the output of the soft-decision Viterbi decoder for coded DD channel estimation to obtain more accurate decision symbols than hard-decision symbols. To both mitigate the effects of noise and smooth incorrectly-estimated coefficients, the estimated channel coefficients are twodimensionally averaged. The enhanced accuracy leads to the high-performance DQPSK demodulation robust to Doppler spread and noise. The proposed method may also contribute to the launch of the future T-DMB service of providing a higher data rate. Simulation results show that the proposed scheme performs much better than the conventional method, especially at high speed-moving receivers. © 2007 IEEE.
- KSP Keywords
- Channel Coefficients, Channel estimation(CE), Coherent Detection, Conventional methods, Decision-directed channel estimation, Differential demodulation, Doppler spread, Enhanced Accuracy, Estimation method, High Speed, High performance