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http://dx.doi.org/10.5207/JIEIE.2005.19.1.148

A Study on Performance Requirement of I/Q Impairments for RF Implementation in W-CDMA User Equipment  

Lee, Il-Kyoo (공주대학교 정보통신공학부)
Publication Information
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers / v.19, no.1, 2005 , pp. 148-154 More about this Journal
Abstract
This paper deals with performance degradations caused by RF I/Q impairments such as amplitude mismatch and phase mismatch in W-CDMA user equipment which uses QPSK(Quadrature Phase Shift Keying) modulation. The impacts of I/Q impairments on the BER(Bit Error Rate) are analyzed by using the variations of adjacent symbol distance. The BER versus amplitude mismatch and phase mismatch with QPSK constellation is reviewed through Matlab simulation. Performance degradation produced by RF I/Q impairments is measured with the implemented RF transceiver and modulation/demodulation test equipments through EVM(Error Vector Magnitude). The minimum performance requirements of amplitude mismatch and phase mismatch in W-CDMA user equipment are presented from the point of hardware implementation and the test method of the impairments is also included.
Keywords
W-CDMA; I/Q amplitude mismatch; I/Q phase mismatch; EVM; BER; RF transceiver;
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  • Reference
1 B.Law and M. Groh, 'Identifying RF-related impairments in full-service digital networks,' Microwave Journal, vol. 39, pp. 88,90,92,94, March 1996
2 HP VSA Series Transmitter Tester, literature number 5966-4762E
3 Vector Modulation Measurements, HP application Note 343-4, literature number 5952-3703
4 K. Feher, Digital Communications, Prentice Hall 1981:Englewood Ciffs, New Jersey
5 O. K. Jennsen, T. E. Kolding, C. R. Iverswn, S. Laursen, R. V. Reynisson, J. H. Mikkelsen, E. Pedersen, M. B. Jenner, and T. Larsen, 'RF Receiver Requirements for 3G W-CDMA Mobile Equipment,' Microwave Journal, pp.22-46, Feb.2000
6 J. H. Mikkelsen, T. E. Kolding, T. Larsen, T. Klingenbrunn, K.I. Pedersen, and P. Mogensen, 'Feasibility Study of DC offset Filtering for UTRA-FDD/W-CDMA Direct-Conversion Receiver,' in IEEE NORchip Conference, pp. 34-39, Nov. 5th 1999
7 A. Parssinen, J. Jussila, J. Ryynanen, L. Sumanen, and K. Halonen, 'A Wide-band direct conversion receiver for WCDMA applications,' in 1999 IEEE International Solid-State Circuits Conference, pp.220-221, 1999
8 Hewlett Packard, 'Using Error Vector Magnitude Measurements to Analyze and Troubleshoot Vector Modulated Signals', Product Note HP 89400-8
9 Il-kyoo LEE, Dong-han LEE, Jae-young KIM, Hyun-jin Hong, Seung-hyeub OH, 'Analysis of UE RF Parameters for 3GPP Specification,' VTC2002-Fall, vol. 1, November, 2002