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Complex Form Bandpass Sampling with Offset Frequency Sampling and Quadrature Component Interpolation for Modulated Signals
IEICE TRANSACTIONS on Communications
Publication Date: 2003/12/01
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Software Defined Radio Technology and Its Applications)
bandpass sampling, complex form, interpolation, undersampling,
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This paper proposes complex form BandPass Sampling (BPS) that is suitable for the software radio. This BPS utilizes offset frequency sampling and quadrature component interpolation. Three types of BPS techniques are first reviewed, which shows effectiveness of the proposed BPS technique. The major advantages over the conventional BPS techniques are: i) free from the DC offset that is caused by the leak of the sampling clock harmonics into the received signal, and ii) reduction of alias by the complex number processing in the signal detection. Next, detailed description of the BPS operation shows that it requires real-time interpolation for the time alignment of the sampled quadrature component. Finally, computer simulation shows that the misalignment generates distortion, and that effective interpolation techniques can reduce the distortion level less than -60 dB even for wideband signals.