The traditional channel models usually consider the effects of multipath fading only. A new fading model including shadowing and multipath fading is established, and a novel generation method for this correlated composite fading is presented. The proposed method is based on the sum-of-sinusoids (SoS) theory that is easy to implement with hardware. Moreover, theoretical envelope distribution and correlation coefficient of output fading are derived. A method for calculating simulation parameters is given. Experiments on a Virtex4 FPGA hardware platform show that the envelope distribution, Doppler power spectrum and correlation characteristic agree well with the expected values, meaning that the proposed method can be used to simulate random distortion of wireless signals caused by real propagation environment in the lab.
ZHOU Sheng-kui, ZHU Qiu-ming, DAI Xiu-chao, LIU Xing-lin, CHEN Xue-qiang
. A Novel Method for Generation of Correlated Composite Fading[J]. Journal of Applied Sciences, 2015
, 33(5)
: 470
-480
.
DOI: 10.3969/j.issn.0255-8297.2015.05.002
[1] Cheng X, Yao Q, Wen M W, Wang C X, Song L Y, Jiao B L. Wideband channel modeling and intercarrier interference cancellation for vehicle-to-vehicle communication systems [J]. IEEE Journal on Selected Areas in Communications, 2013, 31(9): 434-448.
[2] Michailidis E T, Theofilakos P, Kanatas A G. Three-dimensional modeling and simulation of MIMO mobile-to-mobile via stratospheric relay fading channels [J]. IEEE Transactions on Vehicular Technology, 2013, 62(5): 2014-2030.
[3] Nakagami M. The m-distribution: a general formula of intensity distribution of rapid fading statistical methods of radio wave propagation [M]. Japan: W C Hoffman, 1960.
[4] Alenka Z. Mobile-to-mobile wireless channels [M]. London: Artech House Publishers, 2013.
[5] Reig J, Rubio L. Estimation of the composite fast fading and shadowing distribution using the log-moments in wireless communications [J]. IEEE Transactions on Wireless Communications, 2013, 12(8): 3672-3681.
[6] Zhu Q M, Dang X Y, Xu D Z, Chen X M. Highly efficient rejection method for generating Nakagami-m sequences [J]. Electronic Letters, 2011, 47(19): 1100-1101.
[7] Souza R, Cogliatti R, Yacoub M. Efficient acceptance-rejection method for Nakagami-m complex samples [J]. Wireless Communications Letters, 2014, 3(1): 94-96.
[8] Beaulieu N C, Cheng C. Efficient Nakagami-m fading channel simulation [J]. IEEE Transactions on Vehicular Technology, 2005, 54(2): 413-424.
[9] Alimohammad A, Fard S F, Cockburn B F. Hardware implementation of Nakagami and Weibull variate generators [J]. IEEE Transactions on Very Large Scale Integration (VLSI) Systems, 2012, 20(7): 1276-1284.
[10] Alimohammad A, Fard S F. FPGA Implementation of isotropic and nonisotropic fading channels[J]. IEEE Transactions on Circuits and Systems, 2013, 60(11): 796-800.
[11] Szyszkowicz S S, Yanikomeroglu H, Thompson J S. On the feasibility of wireless shadowing correlation models [J]. IEEE Transactions on Vehicular Technology, 2010, 59(9): 4222-4236.
[12] Patzold M. Mobile fading channel [M]. 2nd ed. New York: Wiley, 2012: 95-102.
[13] Gutierrez C A, Patzold M. On the correlation and ergodic properties of the squared envelope of SOC Rayleigh fading channel simulators[J]. Wireless Personal Communications, 2013, 68(3): 963-979.
[14] Yang J X, Nour C A, Langlais C. Correlated fading channel simulator based on the overlapsave method [J]. IEEE Transactions on Wireless Communications, 2013, 12(6): 3060-3071.
[15] Abramowitz M, Stegun I A. Pocketbook of mathematical functions [M]. Thun, Frankfurt: Deutsch, 1984.
[16] Papoulis A, Pillai S U. Probability random variables and stochastic processes [M]. 4th ed. New York: McGraw-Hill, 2002: 134-135.
