Increasing the Efficiency of Rake Receivers for Ultra-Wideband Applications
In diversity rich environments, such as in Ultra-
Wideband (UWB) applications, the a priori determination of the
number of strong diversity branches is difficult, because of the considerably large number of diversity paths, which are characterized
by a variety of power delay profiles (PDPs). Several
Rake implementations have been proposed in the past, in order to reduce the number of the estimated and combined paths. To this
aim, we introduce two adaptive Rake receivers, which combine
a subset of the resolvable paths considering simultaneously the
quality of both the total combining output signal-to-noise ratio (SNR) and the individual SNR of each path. These schemes achieve
better adaptation to channel conditions compared to other known receivers, without further increasing the complexity. Their performance
is evaluated in different practical UWB channels, whose models are based on extensive propagation measurements. The
proposed receivers compromise between the power consumption,
complexity and performance gain for the additional paths, resulting in important savings in power and computational resources.
[1] M. Z. Win and Z. A. Kosti'c, "Virtual path analysis of selective Rake
receiver in dense multipath channels," IEEE Commun. Lett., vol. 3, pp. 308-310, Nov. 1999.
[2] M. Z. Win, G. Chrisikos, and N. R. Sollenberger, "Performance of
Rake reception in dense multipath channels: implications of spreding
bandwidth and selection diversity order," IEEE J. Select. Areas Commun., vol. 18, pp. 1516-1525, Aug. 2000.
[3] M. Z. Win and G. Chrisikos, Wideband Wireless Digital Communications,
ch. Impact of spreading bandwidth and selection diversity order on selective Rake reception. U.K.: Prentice-Hall, 2001, A. F.
Molisch(ed.).
[4] J. D. Choi and W. E. Stark, "Performance of ultra-wideband communications
with suboptimal receivers in multipath channels," IEEE J.
Select. Areas Commun., vol. 20, pp. 1754-1766, Dec. 2002.
[5] M. Z. Win and R. A. Scholtz, "On the energy capture of ultra -wide
bandwidth signals in dense multipath environments," IEEE Commun. Lett., vol. 2, pp. 245-247, Sept. 1998.
[6] Cassioli, D.; Win, M.Z.; Vatalaro, F.; Molisch, A.F. "Low Complexity
Rake Receivers in Ultra-Wideband Channels", IEEE Trans. Wireless Commun, vol. 6, pp. 1265-1275, April 2007.
[7] M.K. Simon, and M.-S. Alouini, "Performance analysis of generalized
selection combining with threshold test per branch (T-GSC)," IEEE Trans. Vehic. Tech., vol. 51, pp. 1018-1029, Sept. 2002.
[8] P. Gupta, N. Bansal, and R. K. Mallik, "Analysis of minimum selection H-S/MRC in Rayleigh fading," IEEE Trans. Commun., vol.
53, no. 5, pp. 780-784, May 2005.
[9] R. K. Mallik, P. Gupta, and Q. T. Zhang, "Minimum selection GSC in independent Rayleigh fading," IEEE Trans. Veh. Technol., vol. 54,
no. 3, pp. 1013-1021, May 2005.
[10] H.-C. Yang, "New results on ordered statitics and analysis of minimum
selection generalized selection combining (GSC)," IEEE Trans. Wireless Commun., vol. 5, no. 7, pp. 1876-1885, July 2006.
[11] M.-S. Alouini and H.-C. Yang, "Minimum estimation and combining generalized selection combining (MEC-GSC)," IEEE Trans. Wireless
Commun., vol. 6, pp. 526-532, Feb. 2007.
[12] W. Li, J. Zhong and T. A. Gulliver, "A Low Complexity RAKE Receiver for Ultra-Wideband Systems," IEEE Vehicular. Technology
Conference., vol. 3, pp. 1393-1396, Sept. 2005.
[13] A. F. Molisch, J. R. Foerster, and M. Pendergrass, "Channel models for ultrawideband personal area networks," IEEE Pers. Commun.
Mag., vol. 10, pp. 14-21, Dec. 2003.
[14] D. Cassioli, M. Z. Win, and A. F. Molisch, "The UWB indoor channel:
from statistical model to simulations," IEEE J. Select. Areas Commun., vol. 20, pp. 1247-1257, Aug. 2002.
[15] A. F. Molisch et al., "IEEE 802.15.4a channel model - final report,"Nov. 2004.
[16] M. Z. Win, R. A. Scholtz, and M. A. Barnes, "Ultra -wide bandwidth signal propagation for indoor wireless communications," in Proc.
IEEE Int. Conf. Commun., vol. 1, pp. 56-60, June 1997, Montrİeal, CANADA.
[17] M. Z. Win and R. A. Scholtz, "Characterization of ultra-wide bandwidth
wireless indoor channels: A communication-theoretic view," IEEE J. Select. Areas Commun., vol. 20, pp. 1613-1627, Dec. 2002.
[18] A. A. Saleh and R. A. Valenzuela, "A statistical model for indoor
multipath propagation," IEEE J. Select. Areas Commun., vol. 5, pp. 128-137, Feb. 1987.
[19] J. R. Foerster, "Channel modeling sub-committee report final," in Tech. Rep. P802.15 02/490r1, IEEE 802.15 SG3a, Feb. 2003.
[1] M. Z. Win and Z. A. Kosti'c, "Virtual path analysis of selective Rake
receiver in dense multipath channels," IEEE Commun. Lett., vol. 3, pp. 308-310, Nov. 1999.
[2] M. Z. Win, G. Chrisikos, and N. R. Sollenberger, "Performance of
Rake reception in dense multipath channels: implications of spreding
bandwidth and selection diversity order," IEEE J. Select. Areas Commun., vol. 18, pp. 1516-1525, Aug. 2000.
[3] M. Z. Win and G. Chrisikos, Wideband Wireless Digital Communications,
ch. Impact of spreading bandwidth and selection diversity order on selective Rake reception. U.K.: Prentice-Hall, 2001, A. F.
Molisch(ed.).
[4] J. D. Choi and W. E. Stark, "Performance of ultra-wideband communications
with suboptimal receivers in multipath channels," IEEE J.
Select. Areas Commun., vol. 20, pp. 1754-1766, Dec. 2002.
[5] M. Z. Win and R. A. Scholtz, "On the energy capture of ultra -wide
bandwidth signals in dense multipath environments," IEEE Commun. Lett., vol. 2, pp. 245-247, Sept. 1998.
[6] Cassioli, D.; Win, M.Z.; Vatalaro, F.; Molisch, A.F. "Low Complexity
Rake Receivers in Ultra-Wideband Channels", IEEE Trans. Wireless Commun, vol. 6, pp. 1265-1275, April 2007.
[7] M.K. Simon, and M.-S. Alouini, "Performance analysis of generalized
selection combining with threshold test per branch (T-GSC)," IEEE Trans. Vehic. Tech., vol. 51, pp. 1018-1029, Sept. 2002.
[8] P. Gupta, N. Bansal, and R. K. Mallik, "Analysis of minimum selection H-S/MRC in Rayleigh fading," IEEE Trans. Commun., vol.
53, no. 5, pp. 780-784, May 2005.
[9] R. K. Mallik, P. Gupta, and Q. T. Zhang, "Minimum selection GSC in independent Rayleigh fading," IEEE Trans. Veh. Technol., vol. 54,
no. 3, pp. 1013-1021, May 2005.
[10] H.-C. Yang, "New results on ordered statitics and analysis of minimum
selection generalized selection combining (GSC)," IEEE Trans. Wireless Commun., vol. 5, no. 7, pp. 1876-1885, July 2006.
[11] M.-S. Alouini and H.-C. Yang, "Minimum estimation and combining generalized selection combining (MEC-GSC)," IEEE Trans. Wireless
Commun., vol. 6, pp. 526-532, Feb. 2007.
[12] W. Li, J. Zhong and T. A. Gulliver, "A Low Complexity RAKE Receiver for Ultra-Wideband Systems," IEEE Vehicular. Technology
Conference., vol. 3, pp. 1393-1396, Sept. 2005.
[13] A. F. Molisch, J. R. Foerster, and M. Pendergrass, "Channel models for ultrawideband personal area networks," IEEE Pers. Commun.
Mag., vol. 10, pp. 14-21, Dec. 2003.
[14] D. Cassioli, M. Z. Win, and A. F. Molisch, "The UWB indoor channel:
from statistical model to simulations," IEEE J. Select. Areas Commun., vol. 20, pp. 1247-1257, Aug. 2002.
[15] A. F. Molisch et al., "IEEE 802.15.4a channel model - final report,"Nov. 2004.
[16] M. Z. Win, R. A. Scholtz, and M. A. Barnes, "Ultra -wide bandwidth signal propagation for indoor wireless communications," in Proc.
IEEE Int. Conf. Commun., vol. 1, pp. 56-60, June 1997, Montrİeal, CANADA.
[17] M. Z. Win and R. A. Scholtz, "Characterization of ultra-wide bandwidth
wireless indoor channels: A communication-theoretic view," IEEE J. Select. Areas Commun., vol. 20, pp. 1613-1627, Dec. 2002.
[18] A. A. Saleh and R. A. Valenzuela, "A statistical model for indoor
multipath propagation," IEEE J. Select. Areas Commun., vol. 5, pp. 128-137, Feb. 1987.
[19] J. R. Foerster, "Channel modeling sub-committee report final," in Tech. Rep. P802.15 02/490r1, IEEE 802.15 SG3a, Feb. 2003.
@article{"International Journal of Electrical, Electronic and Communication Sciences:58912", author = "Aimilia P. Doukeli and Athanasios S. Lioumpas and George K. Karagiannidis and Panayiotis V. Frangos and P. Takis Mathiopoulos", title = "Increasing the Efficiency of Rake Receivers for Ultra-Wideband Applications", abstract = "In diversity rich environments, such as in Ultra-
Wideband (UWB) applications, the a priori determination of the
number of strong diversity branches is difficult, because of the considerably large number of diversity paths, which are characterized
by a variety of power delay profiles (PDPs). Several
Rake implementations have been proposed in the past, in order to reduce the number of the estimated and combined paths. To this
aim, we introduce two adaptive Rake receivers, which combine
a subset of the resolvable paths considering simultaneously the
quality of both the total combining output signal-to-noise ratio (SNR) and the individual SNR of each path. These schemes achieve
better adaptation to channel conditions compared to other known receivers, without further increasing the complexity. Their performance
is evaluated in different practical UWB channels, whose models are based on extensive propagation measurements. The
proposed receivers compromise between the power consumption,
complexity and performance gain for the additional paths, resulting in important savings in power and computational resources.", keywords = "Adaptive Rake receivers, diversity techniques, fading channels, UWB channel.", volume = "3", number = "7", pages = "1442-5", }
