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  1. 2 Acta Physica Polonica A

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  1. 2 2013

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  1. 2 Kohli A.

  2. 2 Ratan R.

  3. 2 Sharma S.

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Performance Comparison of QPSK Based Single and Double Stage Digital Interpolators

100%
Ratan R., Sharma S., Kohli A.
Acta Physica Polonica A
|
2013
|
vol. 123
|
issue 2
196-198
EN
In this paper, the performance of single stage and double stage digital interpolators has been compared and has been showed that by using multi stage interpolation system the reliability of any communication system increases drastically. Digital signal interpolation systems can be implemented in a variety of ways. The basic interpolator for up-sampling can be a combination of an expander unit with an interpolation low-pass filter in cascade. Complicated implementations can be done by connecting multiple expander and low-pass filter pairs in cascade. This paper presents the efficient implementation of digital interpolation systems for up-sampling of single stage and double stage digital interpolators by using quadrature phase shift keying technique. Comparison is done in terms of spectrum of generated signal, envelope power, modulated signal trajectory, input and output constellation and noise performance.
2
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Efficient Implementation of Multistage Digital Interpolators Using Half Band Filters

100%
Ratan R., Sharma S., Kohli A.
Acta Physica Polonica A
|
2013
|
vol. 123
|
issue 2
199-201
EN
The process of increasing the sampling rate of any signal by a factor is known as interpolation. This paper presents the effective and efficient implementation of multistage implementation of digital interpolator using half band filters. The single stage filters are efficient for lower order interpolation factors but for higher rate change which is required in modern digital communication systems like wideband code division multiple access, worldwide interoperability for microwave access single stage implementation does not gives efficient response. For these applications a multistage implementation of the interpolator is preferred. But multistage implementation increases complexity of the overall system. This complexity can be reduced considerably by using half band filters. All this has been done with the help of the Agilent's advanced design software.
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