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Two-dimensional water-filling power allocation algorithm for MIMO-OFDM systems

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Abstract

Departing from the narrowband channel model, more and more researchers have recently considered the application of multiple-input multiple-output (MIMO) systems over frequency-selective fading channels in combination with the orthogonal frequency-division multiplexing (OFDM) technique. In this paper, we focus on the capacity of MIMO-OFDM systems and how to increase the capacity. It has been proved that the capacity of a MIMO system with space-dimensional water-filling power allocation is greater than that of the system with uniform power allocation. In MIMO-OFDM systems, there is an additional degree of freedom to allocate power with respect to MIMO systems: the OFDM sub-channels in frequency-domain. With the singular value decomposition (SVD) applied to the channel frequency response matrix, the two-dimensional water-filling power allocation algorithm for MIMO-OFDM systems is proposed based on the Lagrange method, and the corresponding capacity analysis formula is derived. Simulation results show that the capacity of a MIMO-OFDM system with the proposed two-dimensional water-filling power allocation is greater than that of the system with uniform power allocation and also greater than that of the system with the one-dimensional water-filling power allocation.

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Authors and Affiliations

  1. Department of Electronic Engineering, Shantou University, Shantou, 515063, China

    YongQuan Jiang & MinFen Shen

  2. Department of Electronic Engineering, Sichuan University, Chengdu, 610064, China

    YuanPing Zhou

Authors
  1. YongQuan Jiang
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  2. MinFen Shen
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  3. YuanPing Zhou
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Correspondence to YongQuan Jiang.

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Jiang, Y., Shen, M. & Zhou, Y. Two-dimensional water-filling power allocation algorithm for MIMO-OFDM systems. Sci. China Inf. Sci. 53, 1242–1250 (2010). https://doi.org/10.1007/s11432-010-0088-7

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  • DOI: https://doi.org/10.1007/s11432-010-0088-7

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