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In this paper, we mainly focus on the optimization of multi-level coded modulation scheme in terms of sub-channel code rate optimal assignment and irregular QC-LDPC code construction with the aid of EXIT chart analysis. Simulation results show that the proposed MLCM scheme can achieve additional 0.1dB NCG compared with the UEP coded modulation scheme.
We propose and experimentally demonstrate a 40-Gbps A-RF-tone-based VSSB-DD OFDM PON downstream scheme with symbol pre-distortion and scalable receiver frontend to reduce the SSBI and the computational complexity of ONUs, respectively.
Presented in this paper is an experimental research on the mobile sensor and communication system based on transmitting with ultraviolet in either line-of-sight or non-line-of-sight conditions. The performance of this type of communication system is shown on the experimental platform which is set up. It proves the feasibility of ultraviolet communication system.
We investigate the ultra-high-speed optical communication system at 400Gb/s per channel based on coherent optical orthogonal frequency division multiplexing (CO-OFDM) through theoretical analysis and simulation, focusing on the required OSNR for 1e-3 BER and system performance under different distortion conditions.
We provide a whole scheme design of the DSP part for POLMUX-NRZ-DQPSK coherent receiver, in which the adoptive algorithm of each module and preferred parameter value of algorithm are discussed. Finally, we demonstrate 8×112Gbit/s DWDM transmissions with a 50GHz channel-spacing over 2000km of SSMF by using the digital coherent receiver.
In transparent WSON (wavelength switched optical networks), signals are switched optically and propagate thousands of kilometers without electrical regeneration. Over such distances, physical impairments, such as crosstalk, ASE noise and so on, can accumulate along the path and lead to signal quality degradation. If the admission of a lightpath will either cause its BER to be too high, or sufficiently...
PADE, a digital frequency offset (FO) estimator for optical coherent receivers, has a wide stable-running estimation range. But it converges correctly only when initialized FO is near to real FO. We present a solution to break the restriction by BER aiding, which is proved to be effective by simulation.
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