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Study of 1024-QAM system performance in the presence of filtering imperfections

Study of 1024-QAM system performance in the presence of filtering imperfections

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  • Author(s): P. Mathiopoulos 1 ; H. Ohnishi 2 ; K. Feher 3
    • View affiliations
    • Affiliations: 1: Department of Electrical Engineering, University of Ottawa, Ottawa, Canada
      2: Department of Electrical Engineering, University of Ottawa, Ottawa, Canada
      3: Department of Electrical and Computer Engineering, University of California Davis, Davis, USA
  • Source: Volume 136, Issue 2, April 1989, p. 175 – 179
    DOI:  10.1049/ip-i-2.1989.0024 , Print ISSN 0956-3776, Online ISSN 2053-9053
© The Institution of Electrical Engineers
Published

For the transmission of a standard CEPT, i.e. 2.048 Mbit/s rate digital transmission, in a 240 kHz supergroup band, a 1024-QAM (quadrature amplitude modulated) system employing raised cosine filters with an excess bandwidth of 17% is required. In the paper, the performance of a 1024-QAM system in the presence of different filter imperfections is studied by means of computer simulation. To assess the effects of different channel imperfections, such as filter distortion and/or selective fades caused by residual distortion which are not cancelled by adaptive equalisers, computer simulated results are given, presenting the degradation of the system performance to linear, parabolic, sinusoidal amplitude and group delay distortions. It is shown that sinusoidal amplitude and linear group delay cause the most significant performance degradations. For comparison purposes we also include the results of a same baud rate 512-QAM system.

Inspec keywords: digital communication systems; digital simulation; filtering and prediction theory; amplitude modulation

Other keywords: adaptive equalisers; computer simulation; filtering imperfections; 512-QAM; 240 kHz; selective fades; standard CEPT; residual distortion; filter distortion; 1024-QAM system performance; 2.048 Mbit/s; raised cosine filters

Subjects: Modulation and coding methods; Signal processing and detection; Communications computing

References

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      • P. Mathiopoulos , K. Feher . Performance evaluation of a 512-QAM system in distorted channels. IEE Proc. F , 2 , 199 - 204
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