Understanding digital subscriber line technology
Understanding digital subscriber line technology
Cross-layer optimization for OFDM wireless networks-part II: algorithm development
IEEE Transactions on Wireless Communications
Multiple-subcarrier modulation for nondirected wireless infrared communication
IEEE Journal on Selected Areas in Communications
A physical model of the wireless infrared communication channel
IEEE Journal on Selected Areas in Communications
Non-pilot based synchronization for ACO-OFDM
Asilomar'09 Proceedings of the 43rd Asilomar conference on Signals, systems and computers
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This paper introduces a new constellation mapping scheme for asymmetrically-clipped optical OFDM (ACO-OFDM) that puts more bits on the low-frequency subcarriers. The low-pass nature of the wireless optical channel motivates the use of this generic bit-loading scheme. This scheme has no knowledge of the channel at the receiver; it performs significantly better than the traditional constant constellation mapping on all subcarriers in a variety of channels. The average bit-error rate (BER) curves for the new modulation scheme have up to a 5 dB improvement for signal-to-noise ratios (SNRs) where the BER is in the order of 10-3. In addition to the generic low-frequency bit-loading, this paper also proposes clipping the ACO-OFDM signal at the receiver to mitigate the additive electronic noise.