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Signal Processing Method, Signal Processing Device, Radio Reception Device, And Communication Reception Device
RF direct under-sampling techniques for ideal software-defined Radios!!
Field
Computers, Electrical, Electronics, IT, Software/Multimedia, ICT
Keywords
Low frequency, Quadrature amplitude modulation, Software-defined Radio,
Receiver, Cell-phone, Wireless LAN System, Microminiaturization
Advantages
1. RF direct sampling technique
- Quadrature sampling without use of quadrature-hybrids
- Direct decode of I, Q channel data from RF carrier
- Under Sampling: 100MHz sampling for 2GHz carrier, for example
2. RF carrier recovery technique
- New frequency comparator for modulated signals has been proposed
- Carrier recovery of 16-QAM signals, for example
- Applicable to an OFDM receiver
Abstracts
It is possible to realize an ideal software reception device which can demodulate a higher-order modulation signal without losing vector information even if a carrier wave is sampled with a frequency lower than the carrier wave. A sampling frequency is set so that a phase relationship of the sampling point of an alias signal generated by sampling of a carrier wave with a sampling frequency lower than the carrier wave coincides with a phase relationship of the sampling point of the carrier. That is, the sampling frequency is set so that the carrier wave frequency 'fc' and the sampling frequency 'fs' satisfy the relationship fs = 4fc/(4k + 1), wherein k is a positive integer. Thus, it is possible to perform undersampling of the carrier wave while holding the vector information and demodulate a higher-order modulation such as QPSK and 64QAM.
Inventor
Prof. Masahiro MURAGUCHI et al. (Tokyo University of Science)
Patent Publication No
(APPLICATION NUMBER, FILING DATE)
JP2009-501272 (Feb. 27, 2008), EP08712028.3 (Feb. 27, 2008), US12/449788(Feb. 27, 2008)
(PUBLICATION NUMBER, PUBLICATION DATE)
WO2008105457 (Sep. 4, 2008),EP2124407(Nov.25,2009)
(PRIORITY APPLICATION NUMBER, PRIORITY DATE)
JP2007-046839 (Feb. 27, 2007)
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