JOURNAL BROWSE
Search
Advanced SearchSearch Tips
Efficient Power Allocation Algorithm for Wireless Networks
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
 Title & Authors
Efficient Power Allocation Algorithm for Wireless Networks
Ahn, Hong-Young;
  PDF(new window)
 Abstract
In communication systems the solution of the problem of maximizing the mutual information between the input and output of a channel composed of several subchannels under total power constraint has a waterfilling structure. OFDM and MIMO can be decomposed into parallel subchannels with CSI. Waterfilling solves the problem of optimal power allocation to these subchannels to achieve the rate approaching the channel capacity under total power constraint. In waterfilling, more power is alloted to good channels(high SNR) and less or no power to bad channels to increase the rate of good channels, resulting in channel capacity. Waterfilling finds the exact water level satisfying the power constraint employing an iterative algorithm to estimate and update the water level. In this process computation of partial sums of inverse of square of subchannel gain is repeatedly required. In this paper we reduced the computation time of waterfilling algorithm by replacing the partial sum computation with reference to an array which contains the precomputed partial sums in initialization phase.
 Keywords
OFDM;MIMO;parallel channels;waterfilling;iterative algorithm;
 Language
Korean
 Cited by
 References
1.
J.Y. Park et al., "Cell Edge SINR of Multi-cell MIMO Downlink Channel", The J. of The Institute of Internet, Broadcasting & Comm., Vol 15, No 4, pp. 105-117, 2015

2.
J.S. Yang et al., "Pseudo Jacket Matrix and Its MIMO SVD Channel," The J. of The Institute of Internet, Broadcasting & Comm., Vol 15, No 5, pp. 39-49, 2015

3.
D. Tse and P. Viswanath, Fundamentals of Wireless Communications, Cambridge University Press, May 2005.

4.
T. M. Cover and J. A. Thomas, Elements of Information Theory. New York: Wiley, 1991.

5.
J. Huang, V. Subramanian, R. Agrawal, and R. Berry, "Downlink scheduling and resource allocation for OFDM systems," IEEE Trans. Wireless Commun., vol. 8, no. 1, pp. 288-296, Jan. 2009. crossref(new window)

6.
L. Gao and S. Cui, "Efficient subcarrier, power, and rate allocation with fairness consideration for OFDMA uplink," IEEE Trans. Wireless Commun., vol. 7, no. 5, pp. 1507-1511, 2008. crossref(new window)

7.
T. Yoo, A. Goldsmith, "Capacity an power allocation for fading MIMO channels with channel estimation error," IEEE Transactions on Information Theory, vol.52, no.5, pp.2203-2214, May 2006. crossref(new window)

8.
J. Yang and S. Roy, "On joint transmitter and receiver optimization for multiple-inputmultiple-output(MIMO) transmission systems," IEEE Trans. Commun., vol. 42, no. 12, pp. 3221-3231, Dec. 1994. crossref(new window)

9.
Wei Yu; J. M. Cioffi, "On constant power water-filling," IEEE International Conference on Communications, vol.6, no., pp.1665-1669 vol.6, 2001.