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IEICE Transactions on Communications 2008 E91-B(4):1149-1152; doi:10.1093/ietcom/e91-b.4.1149
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Copyright © 2008 The Institute of Electronics, Information and Communication Engineers

Regular Section -- Letters -- Fundamental Theories for Communications

Power Control of Turbo Coded System in Lognormal Shadowing Channel

Sung-Joon PARK1

1 The author is with the Department of Electrical Engineering, Kangnung National University, 120 GangneungDaehangno, Gangneung-si, Gangwon-do 210-702, Republic of Korea. E-mail: psj{at}ieee.org

Traditionally, it has been considered that the received signal to noise power ratio should be uniformly preserved to maximize system capacity for uncoded system with reliable feedback channel. However, once channel coding is employed as a building block, another power control scheme presents better performance. In this paper, we consider several power reallocation schemes for an effective use of limited power in a turbo coded system in lognormal shadowing channel. We show that the proposed power reallocation can reduce the decoding error probability by almost two orders of magnitude and provide a power gain of 0.87 dB at a target bit error rate of 10-4 over the equal power allocation among all code symbols. We also propose applying different power levels and cut-off thresholds on systematic and parity bits, and investigate the effect of channel estimation error.

Key Words: power control, turbo code, power truncation, channel estimation error

Manuscript received May 24, 2007. Manuscript revised October 16, 2007.

Reference

[1] A.J. Goldsmith and P.P. Varaiya, "Capacity of fading channels with channel side information," IEEE Trans. Inf. Theory, vol.43, no.6, pp.1986–1992, Nov. 1997.

[2] S.-J. Park, "Power control of turbo coded system in Rayleigh fading channel," IEICE Trans. Commun., vol.E90-B, no.1, pp.144–147, Jan. 2007.

[3] T.M. Duman and M. Salehi, "On optimal power allocation for turbo codes," Proc. IEEE ISIT, p.104, Ulm, Germany, June 1997.

[4] A.H.S. Mohammadi and A.K. Khandani, "Unequal power allocation to the turbo-encoder output bits with application to CDMA systems," IEEE Trans. Commun., vol.47, no.11, pp.1609–1610, Nov. 1999.

[5] S.-J. Park and S.W. Kim, "Transmission power allocation in turbo codes," Proc. IEEE VTC, pp.2073–2075, Tokyo, May 2000.

[6] 3GPP TS 25.212 V5.2.0, "Multiplexing and channel coding (FDD)," Release 5, Sept. 2002.

[7] K.S. Gilhousen, I.M. Jacobs, R. Padovani, A.J. Viterbi, L.A. Weaver, and C.E. Wheatley, "On the capacity of a cellular CDMA system," IEEE Trans. Veh. Technol., vol.40, no.2, pp.303–312, May 1991.


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This Article
Right arrow Abstract Freely available
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
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Right arrow Articles by PARK, S.-J.
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