Abstract
The problem of designing a digital frontend (DFE) was considered which can dynamically access or sense dual bands in any radio frequency (RF) regions without requiring hardware changes. In particular, second-order bandpass sampling (BPS) as a technique that enables to realize the multiband reception function was discussed. In a second-order BPS system, digital reconstruction filters were utilized to eliminate the interferences generated while down converting arbitrarily positioned RF-band signals by using the direct digitization method. However, the inaccuracy in the phase shift or the amplitude mismatch between the two sample streams may cause insufficient rejection of interference. Practical problems were studied, such as performance degradation in signal-to-interference ratio (SIR) and compensation methods to overcome them. In order to demonstrate the second-order BPS as a flexible DFE suitable for software-defined radio (SDR) or cognitive radio (CR), a DFE testbed with a reconfigurable structure was implemented. Moreover, with a view to further demonstrate the proposed compensation algorithms, experimental results show that dual bands are received simultaneously.
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BOURDOUX A, CRANINCKX J, DEJONGHE A, van der PERRE L. Receiver architectures for software-defined radios in mobile terminals: The path to cognitive radios [C]// IEEE Radio and Wireless Symposium. Long Beach, CA, 2007: 535–538.
ABIDI A A. The path to the software-defined radio receiver [J]. IEEE Journal of Solid-State Circuits, 2007, 42(5): 954–966.
XU J L, SU Wei, ZHOU Meng-chu. Software-defined radio equipped with rapid modulation recognition [J]. IEEE Transactions on Vehicular Technology, 2010, 59(4): 1659–1667.
MUNOZ-FERRERAS J M, GOMEZ-GARCIA R, PEREZ-MARTINEZ F. RF front-end concept and implementation for direct sampling of multiband signals [J]. IEEE Transactions on Circuits and Systems II: Express Briefs, 2011, 58(3): 129–133.
YU Shu-yang, WANG Xiang-yang. Bandpass sampling of one RF signal over multiple RF signals with contiguous spectrums [J]. IEEE Signal Processing Letters, 2009, 16(1): 14–17.
DEVRIES C A, MASON R D. Subsampling architecture for low power receivers [J]. IEEE Transactions on Circuits and Systems II: Express Briefs, 2008, 55(4): 304–308.
MIRZAEI A, CHEHRAZI S, BAGHERI R, ABIDI A A. Analysis of first-order anti-aliasing integration sampler [J]. IEEE Transactions on Circuits and Systems I: Regular Papers, 2008, 55(10): 2994–3005.
LELANDAIS-PERRAULT C, PETRESCU T, POULTON D, DUHAMEL P, OKSMAN J. Wideband, bandpass, and versatile hybrid filter bank A/D conversion for software radio [J]. IEEE Transactions on Circuits and Systems I: Regular Papers, 2009, 56(8): 1772–1782.
BOSE S, KHAITAN V, CHATURVEDI A. A low-cost algorithm to find the minimum sampling frequency for multiple bandpass signals [J]. IEEE Signal Processing Letters, 2008, 15: 877–880.
RODRIGUEZ-PARERAM S, BOURDOUX A, HORLIN F, CARRABINA J, VAN DER PERRE L. Front-end ADC requirements for uniform bandpass sampling in SDR [C]// IEEE 65th Vehicular Technology Conference. Dublin, Eire, 2007: 2170–2174.
KIM J H, WANG Hong-mei, KIM H J, KIM J U. Bandpass sampling digital frontend architecture for multi-band access cognitive radio [C]// IEEE Global Communications Conference, Honolulu, Hawaii, USA, 2009: 1–6.
KIM H J, KIM J U, KIM J H, WANG Hong-mei. The design method and performance analysis of RF sub-sampling frontend for SDR/CR receivers [J]. IEEE Transactions on Industrial Electron, 2010, 57(5): 1518–1525.
VAUGHAN R G, SCOTT N L, WHITE D R. The theory of bandpass sampling [J]. IEEE Transactions on Signal Processing, 1991, 39(9): 1973–1984.
KIM J H, WANG Hong-mei, KIM J U, LEE S H, YU J H, LEE D H. The analysis and design of RF sub-sampling frontend for SDR [C]// International Workshop on Cognitive Network and Communication. Hangzhou, China, 2008: 1216–1220.
KIM H J, KIM J U, KIM J H, WANG Hong-mei, LEE I S. RF band-pass sampling frontend for multiband access CR/SDR receiver [J]. ETRI Journal, 2010, 32(2): 214–221.
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Foundation item: Research financially supported by Changwon National University in 2009–2010 and the Second Stage of Brain Korea 21 Projects
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Wang, Hm., Kim, Jh., Lee, Sh. et al. Design and compensation of second-order sub-sampling digital frontend. J. Cent. South Univ. Technol. 19, 408–416 (2012). https://doi.org/10.1007/s11771-012-1019-0
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DOI: https://doi.org/10.1007/s11771-012-1019-0