Performance Assessment of a WCDMA Based Radio-over-Fiber System with Near-Far Effect: Uplink Scenario
Subject Areas : electrical and computer engineeringKeywords: RoF WCDMA near-far effect equalization total degradation uplink,
Abstract :
In this research the effect of a radio-over-fiber (RoF) subsystem on the total degradation (TD) performance of uplink wideband code division multiple access (WCDMA) is assessed in the presence of near-far effect. The study considers the use of pilot-aided channel estimation to neutralize the optical subsystem nonlinearities for different channel conditions, estimation intervals, and near-far factors (NFF). The results demonstrate that the proposed equalization technique almost compensates for the joint impact of the optical subsystem nonlinearity and the near-far effect irrespective of spreading factor, large signal distortion, estimation interval, and user number.
[1] G. Baghersalimi and T. O'Farrell, "Pilot-aided estimation and equalisation of a Radio-over-Fiber system in wideband code division multiple access," IET Communications, vol. 7, no. 10, pp. 999-1007, Jul. 2013.
[2] H. Chettat, et al., "Co-simulation-based modeling and performance analysis of hybrid fiber-wireless links," International Journal of Communication Systems, vol. 26, no. 5, pp. 1361-1372, 2013.
[3] A. Goldsmith, Wireless Communications, Artech House, 2005.
[4] M. Anwar Hossain and M. Tarique, "Effect of multipath fading and multiple access interference on broadband code division multiple access systems," Int. J. Communication Systems, vol. 25, no. 7, pp. 874-886, Jul. 2012.
[5] G. Baghersalimi, "Performance assessment of a wideband code-division multiple access-based radio-over-fiber system with near-far effect: downlink scenario," Int. J. Communication Systems, vol. 8, no. 7, pp. 1056-1064, Jul. 2014.
[6] G. Baghersalimi, "A performance study of optical subsystem equalization in a WCDMA-based radio-over-fiber communication system," in Proc. 3rd Int. Congress on Ultra Modern Telecommunications and Control Systems and Workshops, ICUMT'11, 5 pp., Budapest, Hungary, 5-7 Oct. 2011.
[7] X. N. Fernando and A. B. Seasay, "Characteristics of directly modulated RoF link for wireless access," in Proc. Canadian Conf. on Electrical and Computer Engineering, pp. 2167-2170, 2-5 May 2004.
[8] J. Zhang, S. He, and S. Yin, "A memory polynomial predistorter for compensation of nonlinearity with memory effects in WCDMA transmitter," in Proc. Int. Conf. on Communications, Circuits and Systems, ICCCAS'09., pp. 913-916, 23-25 Jul. 2009.
[9] M. H. Shafinia, P. Kabir, P. Pad, S. M. Mansouri, and F. Marvasti, "Errorless codes for CDMA systems with near-far effect," in Proc. IEEE Int. Conf. on Communications, 5 pp., 23-27 May 2010.
[10] , 3GPP. TS 25.212: Multiplexing and Channel Coding (FDD), 2014.
[11] , 3GPP. TS 25.213: Spreading and Modulation (FDD), 2012.