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Various resource allocation and optimization strategies for high bit rate communications on power lines

Abstract : In recent years, the thriving growth of indoor and outdoor communication networks and the increase in number of data heavy applications are driving an ever increasing need for high speed data transmission. Among many competing technologies, power line communication (PLC) has its unique place due to already available power supply grids in both indoor and outdoor environments. The primary motivation of this thesis is to increase the bit rate and the robustness of multicarrier PLC systems so that it can be efficiently used in home networking and automation. The theme of this research work is to explore different modulation and coding approaches in conjunction with various resource allocation and optimization schemes to bring PLC capabilities at par with other high bit rate alternatives and to cope efficiently with inherent disadvantages of power supply grid. A number of resource allocation and optimization strategies are investigated to improve the overall performance of PLC systems. The performance of a communication system is generally measured in terms of bit rate, noise margin and bit error rate (BER) of the system. The bit rate maximization scheme is studied for both orthogonal frequency division multiplexing (OFDM) systems and linear precoded OFDM (LP-OFDM) systems under power spectral density constraint. Two different error rate constraints have been applied to the bit rate maximization problem. The first constraint is the peak BER constraint where all subcarrier or precoding sequences must respect the target BER. With the second constraint, known as mean BER constraint, different subcarriers or precoding sequences are allowed to be affected by different values of BER and a mean BER constraint is imposed on an entire OFDM or LP-OFDM symbol. Discrete bit and power loading algorithms are also proposed taking into account the channel coding gains in the resource allocation process. Furthermore, a new robustness maximization scheme, known as mean BER minimization, is introduced that minimizes the mean BER of multicarrier systems for a given bit rate and an imposed power spectral density mask. For optimal allocation of bit and power to different subcarriers or precoding sequences in a multicarrier system, it is generally supposed that perfect channel state information (CSI) is available at the transmitting side (i.e. estimation noise is absent). In reality, the CSI available at the transmitter is imperfect. We also suggested resource allocation schemes for OFDM and LP-OFDM systems taking into account the effects of noisy estimations in an efficient manner. A number of communication chains are also developed for OFDM and LP-OFDM.
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Contributor : Fahad Syed Muhammad <>
Submitted on : Monday, May 3, 2010 - 5:39:22 PM
Last modification on : Friday, October 23, 2020 - 4:52:20 PM
Long-term archiving on: : Thursday, September 16, 2010 - 12:39:29 PM

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  • HAL Id : tel-00480261, version 1

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Fahad Syed Muhammad. Various resource allocation and optimization strategies for high bit rate communications on power lines. Signal and Image processing. INSA de Rennes, 2010. English. ⟨tel-00480261⟩

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