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Optimal power distribution over pilot tones for multi-carrier communications over power lines

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5 Author(s)
Bueche, D. ; Dept. of Opto-Acousto-Electron., Univ. of Lille Nord de France, Valenciennes, France ; Corlay, P. ; Coudoux, F. ; Gazalet, M.
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In this paper, we propose a method for finding the optimal distribution of pilot power, which will optimize the performance of multi-carrier transmissions over power lines, using comb-type pilots. To find this optimal distribution, we took noise characteristics and channel estimation techniques based on pilot tones associated with interpolation techniques into account. We used two criteria: the classic Mean Square Error of channel estimation and an indicator of performance for multi-tones systems. With these criteria, we used the traditional Lagrange method to obtain different power distributions over pilot tones. In this paper, we show that minimizing the performance indicator is a good criterion, since it evolves as Bit Error Rate. We then present the optimal distribution of pilot power. Our results show that good performances can be achieved with a uniform distribution of pilot power, although the additive noise over pilots is highly colored.

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Consumer Electronics, IEEE Transactions on  (Volume:56 ,  Issue: 3 )