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EFFICIENT POWER ALLOCATION FOR CODED FDM

Platform : DSP

IEEE Projects Years : 2004

This paper appears in: Vehicular Technology Conference, 2004. VTC2004-Fall. 2004 IEEE 60th Issue Date: 26-29 Sept. 2004 AIM: To study the power optimization issues in coded FDM ABSTRACT Coded FDM is a transmission technique used in many practical communication systems. In a coded FDM system., source data are coded, interleaved and multiplexed for transmission over many frequency subchannels. In a conventional coded FDM system, the transmission power of each subcarrier is the same, regardless of the channel condition. However, some subcarriers can suffer deep fading with multi-paths and the power allocated to the faded subcarrier is likely to be wasted. In this paper, we compute the FER and BER bounds of a coded FDM system, given as convex functions for a given channel coder, interleaver and channel response. The power optimization is shown to be a convex optimization problem that can be solved numerically with great efficiency. With the proposed power optimization scheme, we can obtain near-optimum power allocation for a given coded FDM system and channel response to minimize FER or BER under a constant transmission power constraint. LEARNING OBJECTIVE: To study the coded FDM System INPUT: Different band frequency signals OUTPUT : FDM Signals APPLICATIONS: Communication engineering SOFTWARE TOOL USED: MATLAB 2007A

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