ARAB ACADEMY FOR SCIENCE

       Digital Equalization

 

Powered by: Eng. Mahmoud Youssef

With the arrival of high definition television, microwave links and in general all spectrally efficient modulation techniques like 64QAM-140MB CMI (Code Mark Inversion) whose peak to average power ratios is far greater than the traditional modulation methods , the broadcast manufacturer has encountered a new and very series challenges. The increase dynamic range combined with the strict maximum allowed level from all the power amplification stages more linearity than the analog radio frequency design alone.

In order to solve this problem a compromise solution has been proposed. It allows for some nonlinearity in the amplifiers while controlling the out of band using the sharp analog filtering. Unfortunately, severe degradation of the band signal parameters takes place as a consequence of Inter Symbol Interference caused by these analog filters, leaving no other choice but to equalize it.

This paper presents the result of adaptive digital equalization, transversal equalization, the design methodology of adaptive filters and the algorithm suitable to the problem.

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Time Schedule

 

Week 4: overview of coding technique

Week 5: theory of equalization

Week 6: Adaptive and transversal equalizers algorithm  

Week 7: Mathlab simulation and Practical results

 

 

References:

1.Wireless communication  "Andrea goldsmith"

2.NEC manuals

3.http://mail.mcl.hu/wcdma/channel.html

4.http://kabuki.eecs.berkeley.edu/~jrudell/papers/CICC/