A New Approach to Objective Evaluation ofPower - and Bandwidth -
نویسندگان
چکیده
Integrated design of digital compression and modulation ooers performance advantages in practical systems over separate optimization. Integrated system design encourages more general compression deenitions. The total digital integrated transmission system is in this article viewed as an analog-to-analog converter with signal compression ability. A new deenition for compression is presented, incorporating the integrated bandwidth reducing ability and error robustness of the communication system's codec and modem. The compression eeciency is found by comparing the integrated system to a pure analog reference system and is a function of the channel noise level and the reconstructed signal quality. To illustrate the principle behind the compression deenition, obtainable compression ratios are provided for an image transmission system example, with subband coding and 64-QAM signalling.
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