| 摘要(英) |
OFDM systems exhibit superior characteristics in terms of simplicity in combating multi-path transmission and efficiency in spectral utilization. The effects of ICI and ISI arise from the multi-path interference could be successfully eliminated by the insertion of cyclic-prefix and the use of multi-carriers. Furthermore the advantage of spectral efficiency is achieved by orthogonal property. Under the protection of cyclic-prefix, multi-path effect causes distortion of amplitude and phase only. In accordance with the exact channel estimation among each sub-carrier, the distortion could be compensated by one-tap complex coefficients.
With the consideration of hardware implementation, the algorithms of the channel estimation and equalization were investigated and simulated for static channels and fast fading channels for DVB-T system. Moreover, the dependence of the receiving performance upon relationships between channel conditions and system specifications, e.g. transmission band, bandwidth, sub-carrier spacing, etc. would be clarified from simulation results. In contrast to the least-square method with linear interpolation for conventional channel estimator, interpolation filter was proposed to estimate the channel response more accurately, and improve the performance of the receiver further. |
| 參考文獻 |
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