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Fast Optimal Discrete Bit-Loading Algorithms for OFDM-Based Systems

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4 Author(s)
Hyeonmok Ko ; Dept. of Comput. Sci. & Eng., Pohang Univ. of Sci. & Technol. (POSTECH), Pohang, South Korea ; Kiseok Lee ; Seoungyoul Oh ; Cheeha Kim

Adaptive bit allocation for orthogonal frequency division multiplexing (OFDM)-based systems are critical for avoiding performance degradation due to additional bit allocations when channel conditions are bad. In this paper, we present two novel bit-loading algorithms for OFDM-based systems with target bit rate and fixed energy constraints. The proposed algorithms converge to the same bit allocation as the optimal discrete bit-filling and bit-removal algorithms. The proposed algorithms can approach a near-optimal bit allocation with less computational steps by using a water-filling solution at the initial bit allocation step, and then a multiple-bit loading procedure to satisfy the target bit rate. The proposed algorithms were evaluated by comparing with bit-filling and bit-removal algorithms through numerical analysis. Numerical results demonstrate the computational efficiency, fast convergence and optimality of the proposed algorithms.

Published in:

Computer Communications and Networks, 2009. ICCCN 2009. Proceedings of 18th Internatonal Conference on

Date of Conference:

3-6 Aug. 2009