- FILES:
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gzipped postscript
PDF (converted from the postscript)
- AUTHORS:
- D. P. Scholnik
- J. O. Coleman
- TITLE:
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Nonuniformly Offset Polyphase Synthesis of a
Bandpass Signal from Complex-Envelope Samples
- ABSTRACT:
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In this paper we consider the synthesis of a bandpass
signal from complex-envelope samples using a polyphase
conversion structure based on periodically nonuniform
output samples. This approach provides the
flexibility to independently choose the sampling rate
and carrier frequency, overcoming the restrictions of
reconstruction from uniformly spaced output samples.
Key to the design of such a system is a particular
equivalent filter with a piecewise-constant impulse
response that determines both the actual
implementation filters and system performance. The
transition times of this impulse response are found to
be periodically nonuniform, leading to a
characterization of the corresponding frequency
response. An example design using a previously
unavailable carrier frequency is presented which
requires fewer filter taps than the alternative, a
higher-rate uniform system.
- STATUS:
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To be presented at the 1999
Int'l Symposium on Circuits and Systems (ISCAS '99), Orlando, FL, May 1999.
- DATE OF ENTRY:
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February 1999.