Feedback Type Echo Distortion Canceller in an FM Broadcasting Receiver

Fangwei TONG  Yoshihiko AKAIWA  

IEICE TRANSACTIONS on Communications   Vol.E80-B   No.9   pp.1345-1351
Publication Date: 1997/09/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Mobile Communication
FM receiver,  equalizer,  broadcast,  signal processing,  echo canceller,  

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This work is targeted to understand the operating principle of the feedback type echo canceller for use in an FM broadcasting receiver and to study its compensating features and the effects of the practical operating environment on its performance. The effects of the tap interval and the compensation performance in the presence of an echo with excess delay 0 - 15 µs are examined. The results show that the tap interval should be selected according to the observable bandwidth of the channel transfer function and the performance of a feedback type echo canceller has a wavelike curve with respect to the excess delay of the echo. To improve the performance of the feedback type echo canceller, an adaptive echo canceller operating with CM algorithm is proposed and examined with computer simulation. The results show that the compensation performance is improved.