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Required bandwidth, unwanted emission, and data power efficiency for residual and suppressed carrier systems-a comparative study

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3 Author(s)
Nguyen, T.M. ; Jet Propulsion Lab., California Inst. of Technol., Pasadena, CA, USA ; Martin, W.L. ; Hen-Geul Yeh

This paper presents a new concept for required bandwidth along with a method for computing this bandwidth and the associated undesired emission for the classes of PCM/PSK/PM, PCM/PM and BPSK signals. The PCM/PSK/PM signals considered here employ either a square wave or sine-wave subcarrier with NRZ data format. On the other hand, the PCM/PM and BPSK signals use either a Bi-phase or an NRZ data format. Furthermore, the maximum allowable required bandwidth in the presence of noise and the data power efficiency for these modulation schemes will also be investigated. The term “data power efficiency” as considered in this paper consists of two principal components, namely, the amount of power contained in the data channel, and the symbol signal-to-noise ratio (SSNR) degradation due to the presence of intersymbol interference (ISI) for a specified required bandwidth. This paper evaluates both of these components numerically for the modulation schemes considered and the results are then compared. Furthermore, the impact of baseband filtering on the required bandwidth is also investigated in this paper

Published in:

Electromagnetic Compatibility, IEEE Transactions on  (Volume:37 ,  Issue: 1 )

Date of Publication:

Feb 1995

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