Abstract
Efficient frame synchronization is essential for data recovery in communication systems. In this study, a single pilot sequence is used to achieve both frame synchronization and peak-to-average power ratio (PAPR) reduction. The two systems considered are direct-current biased optical orthogonal frequency division multiplexing (DCO-OFDM) and asymmetrically clipped O-OFDM (ACO-OFDM). The pilot symbol is allocated to odd indexed subcarriers only. Thus, the synchronization algorithm leverages the mirror symmetric property of the pilot symbol within a frame to detect the start of the pilot signal at the receiver. This scheme has low complexity and gives precise frame synchronization at signal-to-noise ratios as low as 4 dB in an indoor visible light communication (VLC) channel.
Highlights
Synchronization at the receiver of a practical orthogonal frequency division multiplexing (OFDM)system design is one of the most crucial data detection stages that must be performed accurately in order to avoid system performance degradation due to symbol timing and carrier frequency offset [1].A number of studies have been presented on synchronization techniques in both radio frequencyOFDM (RF-OFDM) and optical OFDM (O-OFDM) systems [2,3]
We present the performance of the proposed PA frame synchronization timing metric by evaluating the average of the metric over 1000 PA O-OFDM frames
The performance evaluation is done in the presence of additive white Gaussian noise (AWGN) and indoor visible light communication (VLC)
Summary
Synchronization at the receiver of a practical orthogonal frequency division multiplexing (OFDM)system design is one of the most crucial data detection stages that must be performed accurately in order to avoid system performance degradation due to symbol timing and carrier frequency offset [1].A number of studies have been presented on synchronization techniques in both radio frequencyOFDM (RF-OFDM) and optical OFDM (O-OFDM) systems [2,3]. The RF-OFDM synchronization schemes include the well-known training symbol-based method proposed by Schmidl and Cox in [2]. The timing metric of this method has a form of plateau as a result of the cyclic prefix concatenated to the OFDM symbols, thereby making it difficult to detect the precise start of the training symbol at the receiver. To reduce this ambiguity, Park et al proposed a synchronization timing metric which has an impulse-like shape with a principal peak indicating the start of the training symbol [4]
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