Performance analysis of partial pre-equalization for ACO-OFDM indoor optical wireless transmissions

Abstract

We propose partial pre-equalization for indoor optical wireless transmissions based on asymmetrically clipped optical orthogonal frequency division multiplexing (ACO-OFDM) with intensity modulation and direct detection (IM/DD). Bit loading is applied to minimize the transmit optical power for a fixed target BER. Similar to pre-equalization, for diffuse indoor optical wireless channels, partial pre-equalization can reduce the transmit optical power over post-equalization for point-to-point transmissions. In addition, we consider broadcast transmissions to multiple users with possibly different channel qualities, where pre-equalization is not applicable. Finally, we specify an appropriate channel estimate at the transmitter for such broadcast transmissions.

Görünür ışık haberleşme sistemleri için yeni bir optik OFDM dalga formu tasarımı

“…Bu nedenle, ℎ _ 𝑡 , üstel bozulma modelinden dağınık bağlantının CIR'si aşağıdaki Eş. 9'daki gibi yazılabilir [10,[19][20][21].…”

“…Bu nedenle, ℎ 𝑡 , tavan sıçrama modelinden dağınık bağlantının CIR'si Eş. 10'daki gibi yazılabilir [10,[19][20][21]. AWGN kanal ortamında BER-SNR nümerik sonuçlarının verildiği Şekil 4 analiz edildiğinde, 1E-4 BER seviyesi için önerilen yöntemin bütün dalga formlarına 5 dB ile 9 dB arasında SNR kazancı sağladığı anlaşılmaktadır.…”

Indoor Optical Wireless Transmission under Artificial Neural Networks

“…The optical quality of a source is wellcharacterized as the optical force delivered per strong point in units of Watts per steradian [3]. Remote optical connections pass on information by balancing the prompt optical force quality, in answer to an information electrical flow signal x(t).…”

Performance Improvement of ACO-OFDM Indoor Optical Wireless Transmissions Using Partial Pre-Equalization

“…Nevertheless, OWC still possesses some drawbacks. One restriction is that the available optical transmit power is limited by eyesafety standards [15].…”

“…Partial pre-equalization is therefore proposed in this paper to overcome these limitations of pre-equalization. The preliminary version of the paper was presented in [15].…”