SUMMARYIn this letter, we analyse the bit error rate (BER) of a discrete multitone modulation system considering the channel estimation error for the frequency equalisation. After having established an approximate relation for the BER, we propose a simple performance indicator, which accounts for the channel estimation error, the power emitted and the noise level. In order to check the validity of the indicator, simulation has been performed. The results prove that it is more adapted to discrete multi-tone modulation (DMT) systems than the classical mean squared channel estimation error (MSE), above all when the channel additive noise is coloured.
Real time transmission of compressed video data over power line channels is a challenging task because of the severe characteristics of the power line transmission medium. Several techniques have been investigated recently to make a compressed video bitstream robust to the channel distortions. In this paper, we consider the benefit of using hierarchical transmission for error resilience. We propose an original video transmission scheme based on layered video coding combined with unequal error protection. Here, unequal error protection is achieved using a hierarchical multi-carrier modulation scheme based on hierarchical quadrature amplitude modulation. In particular, we propose a hierarchical bit and power allocation algorithm specific to hierarchical MCM. Some simulation results are presented to show the interest of applying unequal error protection by hierarchical coding of layered video bitstreams.
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