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Cognitive radios for dynamic spectrum access - polyphase multipath radio circuits for dynamic spectrum access

机译:动态频谱访问的认知无线电-动态频谱访问的多相多径无线电电路

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Dynamic access of unused spectrum via a cognitive radio asks for flexible radio circuits that can work at an arbitrary radio frequency. This article reviews techniques to realize radios without resorting to frequency selective dedicated filters. In particular, a recently proposed polyphase multipath technique canceling harmonics and sidebands is discussed. Using this technique, a wideband and flexible power upconverter with a clean output spectrum has been realized on a CMOS chip, aiming at flexible radio transmitter application. Prototype chips can transmit at an arbitrary frequency between DC and 2.4 GHz. Unwanted harmonics and sidebands are more than 40 dB lower than the desired signal up to the 17th harmonic of the transmit frequency
机译:通过认知无线电对未使用频谱的动态访问需要可在任意无线电频率下工作的灵活的无线电电路。本文介绍了无需借助频率选择性专用滤波器即可实现无线电的技术。特别地,讨论了最近提出的消除谐波和边带的多相多径技术。使用此技术,已在CMOS芯片上实现了具有干净输出频谱的宽带,灵活的功率上变频器,旨在实现灵活的无线电发射机应用。原型芯片可以在DC和2.4 GHz之间的任意频率下传输。不需要的谐波和边带比所需信号低40 dB以上,直至发射频率的第17个谐波

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