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Volume 32 Issue 3
Aug.  2010
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Zhao Li, Sun Xian-pu, Zhang Hai-lin. An Improved Water-filling Algorithm for Discrete Bit Allocation[J]. Journal of Electronics & Information Technology, 2010, 32(3): 638-642. doi: 10.3724/SP.J.1146.2009.00328
Citation: Zhao Li, Sun Xian-pu, Zhang Hai-lin. An Improved Water-filling Algorithm for Discrete Bit Allocation[J]. Journal of Electronics & Information Technology, 2010, 32(3): 638-642. doi: 10.3724/SP.J.1146.2009.00328

An Improved Water-filling Algorithm for Discrete Bit Allocation

doi: 10.3724/SP.J.1146.2009.00328
  • Received Date: 2009-03-13
  • Rev Recd Date: 2009-10-09
  • Publish Date: 2010-03-19
  • In this paper, an improved water-filling algorithm is proposed for the problem of Discrete Bit Allocation DBA in OFDM systems. The bit-water-level, defined in this paper as the water-filling level under which the power allocated to a certain sub-carrier satisfies the integer bit constraint, is used in the proposed algorithm. First, using the bit-water-levels of the sub-carrier with the maximal channel gain, bits and power are allocated to all the sub-carriers. Then, the allocation results are adapted to satisfy the total transmit power constraint. It is proved that the algorithm yields the optimal solution and its computational complexity depends only on the number of sub-carriers.
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  • Jang J, Lee K B, and Lee Y H. Transmit power and bitallocations for OFDM systems in a fading channel [C]. IEEEGlobal Telecommunications conference, San Francisco, USA,2003: 858-862.[2]Hughes-Hartogs D. Ensemble modem structure for imperfecttransmission media [P]. US. 4679227, 1987. 4731816, 1988.4833706, 1989.[3]薛金银, 焦秉立. 一种改进的OFDM自适应比特及功率分配算法[J]. 北京大学学报(自然科学版), 2006, 42(1): 93-98.Xue Jin-yin and Jiao Bing-li. An improved bit and powerallocation algorithm for OFDM systems [J]. Acta ScientiarumNaturalium Universitatis Pekinensis, 2006, 42(1): 93-98.[4]余官定, 张朝阳, 仇佩亮. OFDM系统功率和比特分配算法研究[J].电子与信息学报.2005, 27(9):1479-1482浏览[5]Hou Li-ming and Lin Xiao-kang. A Grouping method of bitloading for real-time OFDM-based wireless networks [C]. The4th International Conference on Wireless Communications,Networking and Mobile Computing, Dalian, China, 2008:1-4.[6]Zhang Dong-mei, Xu You-yun, and Cai Yue-ming. A highefficiency algorithm of power and bit allocation for OFDMAsystems [C]. The 3th International Conference on WirelessCommunications, Networking and Mobile Computing,Hawaii, USA, 2007: 85-88.[7]Nader-Esfahani S and Afrasiabi M. Simple bit loadingalgorithm for OFDM-based systems [J]. IETCommunications, 2007, 1(3): 312-316.[8]Bansal G, Hossain M J, and Bhargava V K. Optimal andsuboptimal power allocation schemes for OFDM-basedcognitive radio systems [J]. IEEE Transactions on WirelessCommunications, 2008, 7(11): 4710-4718.[9]Lee Hyang-Won and Chong Song. Downlink resourceallocation in multi-carrier systems: frequency-selective vs.equal power allocation [J]. IEEE Transactions on WirelessCommunications, 2008, 7(10): 3738-3747.[10]Campello J. Optimal discrete bit loading for multicarriermodulation systems [C]. IEEE International Symposium onInformation Theory, Cambridge, Mass, USA. 1998: 193.
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