Average transmit power reduction through power allocation for OFDM-based indoor wireless optical communications

Farooqui, Muhammad Zubair; Saengudomlert, Poompat

doi:10.1109/ecticon.2011.5947837

Cited by 2 publications

(1 citation statement)

References 12 publications

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“…The use of the selected mapping technique was investigated in [14] to achieve reduction in average transmit optical power. A simple power allocation approach was suggested in [15] to achieve power reduction for a specific BER requirement. In [16], sparsity together with uncertainty principle was used for average power reduction.…”

Section: Average Transmit Power Issue In Multi-carrier Optical Wirelementioning

confidence: 99%

Transmit power reduction through subcarrier selection for MC-CDMA-based indoor optical wireless communications with IM/DD

Farooqui

Saengudomlert

2013

J Wireless Com Network

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This research addresses the issue of average transmit optical power reduction in multi-carrier code division multiple access (MC-CDMA)-based indoor optical wireless communications employing intensity modulation with direct detection. The problem is treated in a novel way by investigating pre-and post-equalization-based subcarrier selection for transmit power reduction in downlink transmissions. Analytical expressions are derived for upper bounds of the required fixed DC bias for both cases. The fixed DC bias is used to reduce the system complexity on one hand and to devise optimal subcarrier selection criteria on the other. Simulation results based on the proposed subcarrier selection reveal significant power reduction subject to the 10 −4 bit error rate (BER) requirement for 10-Mbps 64-subcarrier MC-CDMA-based indoor optical wireless communication systems. In addition, the BER performance obtained from pre-equalization is shown to be no higher than that obtained from post-equalization for the same transmit power.light. The key advantages of such optical wireless systems are usage of flexible unlicensed spectrum, high data rate support, energy efficiency, no electromagnetic interference, low-cost front ends, and inherent security. Major issues are eye and skin safety problems which can be dealt with by limiting the average transmit optical power.The contributions of this research, which are not reported previously to the best of the authors' knowledge, are highlighted as follows:1. Average transmit optical power reduction is accomplished by subcarrier selection for the first time in MC-CDMA-based indoor optical wireless communication systems employing intensity modulation with direct detection (IM/DD). Expressions for upper bounds of a fixed DC biasusing pre-and post-equalization-based subcarrier selection are analytically derived for MC-CDMA-based IM/DD system. 3. Optimal subcarrier selection algorithms that minimizes the bit error rate (BER) for a fixed transmit optical power are proposed for both pre-and post-equalization.

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Section: Average Transmit Power Issue In Multi-carrier Optical Wirelementioning

confidence: 99%

Transmit power reduction through subcarrier selection for MC-CDMA-based indoor optical wireless communications with IM/DD

Farooqui

Saengudomlert

2013

J Wireless Com Network

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OFDM-Based VLC Systems: A Systematic Review

Ali,

Abdulkafi

2024

BIO Web Conf.

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Visible Light Communications (VLC) represents a new technology of wireless communications allowing high data rate, high-speed internet access, green and friendly communication system, especially for indoor users, where the use of Light Emitting Diodes (LEDs) is growing as a viable alternative to traditional illumination. Orthogonal frequency division multiplexing (OFDM) is a promising modulation format for optical wireless communication (OWC); however, precise channel estimation is required for synchronization and equalization. Moreover, one of the challenging issues for OFDM is its high Peak-to-Average Power Ratio (PAPR) due to the superposition of all subcarriers; therefore, the system requires a high linearity and dynamic range. This paper provides a systematic overview of OFDM-based VLC systems, highlighting the essential aspects of PAPR reduction and channel estimation techniques. Several technical challenges have been addressed to realize the full potential of OFDM-based VLC technology. Moreover, we provide new insights into the over-explored and under-explored areas, which lead us to identify open research problems of VLC based on OFDM. Concisely, this paper serves as a guide and a starting point for researchers willing to research VLC using OFDM.

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Average transmit power reduction through power allocation for OFDM-based indoor wireless optical communications

Cited by 2 publications

References 12 publications

Transmit power reduction through subcarrier selection for MC-CDMA-based indoor optical wireless communications with IM/DD

Transmit power reduction through subcarrier selection for MC-CDMA-based indoor optical wireless communications with IM/DD

OFDM-Based VLC Systems: A Systematic Review

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