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Silicon photonics which is compatible with mature complementary metal oxide semiconductor (CMOS) fabrication process has been extensively demonstrated for monolithic integration of photonic and electrical circuits. We show that an integrated silicon Mach-Zehnder modulator (MZM) may be used for advanced modulation formats despite the nonlinear dependence of refractive index change with applied voltage...
In this paper, we propose a modified preamble based channel estimation for the orthogonal frequency division multiplex/offset QAM (OFDM/OQAM). In present of multi-path effect, the inter symbol interference (ISI) always exists in the OFDM/OQAM system and the preamble based channel estimation for the conventional orthogonal frequency division multiplex with cyclic prefix (CP-OFDM) is not feasible any...
OFDM (Orthogonal frequency division multiplexing) is one of the key techniques for 4th generation high data rate communications system. However OFDM suffers from high peak-to-average power ratio (PAPR) which substantially degrades the efficiency of a linear power amplifier. A new nonlinear companding transform using hyperbolic tangent sigmoid transfer function is proposed for PAPR reduction in this...
In this paper, a novel cyclic convolution method is proposed to reduce the peak-to -average-power ratio (PAPR) of the orthogonal frequency division multiplexing (OFDM) signals. This method transforms the parallel signals of OFDM into other parallel signals with lower PAPR by cyclic convolution operation. With cyclic convolution by an appropriate vector, a significant reduction of PAPR can be obtained...
A new tone reservation (TR) scheme for the peak-to-average power ratio (PAPR) reduction in the orthogonal frequency division multiplexing (OFDM) system is proposed. Different from the conventional TR scheme, the cancellation signals are generated by using FFT/IFFT iteration. Simulation results show that the new TR scheme based on FFT/IFFT has a perfect PAPR reduction performance and the number of...
In this paper, a novel distortionless peak-to-average power ratio (PAPR) reduction method using the autoregressive (AR) model is proposed. This method transforms parallel input data sequences into quasi-white noise signals by utilizing the AR model, which can reduce the autocorrelation of parallel input data sequences greatly, so PAPR can be reduced effectively. Based on simulation, this method can...
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