Title :
System design for an experimental cognitive transceiver
Author :
Ashok, Amit ; Subbiah, Iyappan ; Heinen, Stefan
Author_Institution :
Integrated Analog Circuits & RF Syst., RWTH Aachen, Aachen, Germany
Abstract :
The aim of this paper is to show a detailed system design and bring out the challenges for cognitive transceivers in UHF band. An experimental cognitive transceiver is proposed based on commercially available components. The complete system aspects of a filterless implementation are discussed. Along with the intermodulation test for LTE specified by the 3GPP, the intermodulation of Tx leakage with the blocker arising in an FDD scenario is also dealt with. It is shown that even with highly linear RF components, the receiver cannot sustain Tx leakage. The blocker performance and the channel filtering requirements for a SAW-less transceiver are also shown along with an AGC algorithm for a steady SNR. With a brief system analysis, the effect of transmitter noise leaking into the Rx band and its impact on the sensitivity are discussed. The experimental setup has the provision to test the impact of full-FDD, half-FDD and TDD modes on the RF performance in a cognitive environment.
Keywords :
3G mobile communication; Long Term Evolution; automatic gain control; cognitive radio; filtering theory; intermodulation; radio transceivers; wireless channels; 3GPP; AGC algorithm; FDD scenario; LTE; Rx band; RF performance; SAW-less transceiver; Tx leakage; TDD modes; UHF band; blocker performance; channel filtering requirements; cognitive environment; experimental cognitive transceiver; filterless implementation; full-FDD modes; half-FDD modes; intermodulation test; linear RF components; system design; transmitter noise; Bandwidth; Gain; Radio frequency; Receivers; Signal to noise ratio; Transceivers;
Conference_Titel :
Ph.D. Research in Microelectronics and Electronics (PRIME), 2013 9th Conference on
Conference_Location :
Villach
Print_ISBN :
978-1-4673-4580-4
DOI :
10.1109/PRIME.2013.6603149
