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This paper analyses the phase noise of Coherent optical OFDM (CO-OFDM) system inducing by chromatic dispersion (CD), fiber nonlinearity and amplified spontaneous-emission (ASE) noise. Zero interpolated in OFDM symbol could improve the transmission performance without requiring additional optical components, because the impact of system nonlinearity could be moderated. Simulation shows that a 2-dBm...
A new synchronization method for MIMO-OFDM systems with CAZAC sequence is presented in this paper. Frame timing objective functions is sharpen by using CAZAC Sequence, and its accuracy is also improved. Combing frame and symbol synchronization, only one step is needed for timing algorithm. Reducing the computation load and defining the first channel path accurately. Integral frequency offset correction...
This paper presents the architecture of OFDM-based optical network capable of sub-wavelength granularity scheduling and switching, along with its beneficial analysis including cost saving, resource usage efficiency, and adaptive physical-layer impairment tolerance.
A new networking approach based on IP/optical OFDM technologies is proposed, providing an adaptive mechanism of bandwidth provisioning and pipe resizing for dynamic traffic flows. A comparison study is presented to demonstrate its advantages.
According to the feature of underwater acoustic channel (UWA), the implementation of time and frequency synchronization is introduced. In the sea area, the experiment result show that the synchronization method of OFDM system has the better performance.
Optical fiber-based access networks are being deployed to address the increasing demand for bandwidth and help to support multiple services. As for the future optical access networks, different technologies have been proposed and under investigations, including WDM-based passive optical networks (WDM-PON), optical coding division multiplexing -based PON (OCDM-PON), and orthogonal frequency division...
A new programmable router interface with adaptive packet over optical OFDMA transmission is proposed, providing a perfect mechanism of bandwidth partition for link virtualization. A comparison study is presented to demonstrate its advantages.
We experimentally demonstrate, for the first time, a novel LightLabel OFDM (LL-OFDM) system supporting real-time lightpath tracing and cross-layer lightpath configuration. Simulations show its benefits, including reduced setup latency and lower blocking probability.
We demonstrate a novel optical OFDMA ring network with an adaptive sub-carrier allocation algorithm, which utilizes queuing length and traffic characteristics to effectively support multicasting and real-time traffic flows.
This paper designs multiple channel scheduling algorithms for WDM PONs and OFDMA PONs to allocate upstream bandwidth resource to competing users. Simulation results demonstrate that the proposed algorithms obtain higher channel utilization.
In this paper, a novel resource allocation algorithm is proposed for multi-service OFDMA systems. The multi-objective optimization model is established for resource allocation, according to the different QoS requirements of different services. In order to achieve the suboptimal solution for the multi-objective optimization problem, this paper proposes a novel hierarchical algorithm, and adopting some...
We propose a PON architecture based on orthogonal frequency division multiple access (OFDMA) technologies. The system produces transparent pipes for transmission of heterogeneous services. A virtual PON scheme based on OFDMA is further introduced.
Bused on the features of underwater acoustic channel, a novel scheme of timing synchronization for OFDM systems is proposed. An adaptive pilot coarse timing synchronization method is used for established synchronization rapidly. For getting the accuracy timing position, CAZAC sequence is used as fine timing synchronization. Both the computer simulation results and laboratory pool tests show that the...
A novel passive optical network (PON) architecture based on optical orthogonal frequency division multiple access (OFDMA) technologies is presented. Two potential medium access control (MAC) methods namely dynamic circuit transmission and fixed burst transmission are investigated.
A novel unidirectional path switched ring (UPSR) based on optical orthogonal frequency division multiple access (OFDMA) technologies is introduced. Two types of reservation-based and token-based multiple access control (MAC) protocols are proposed and compared.
This paper is about time synchronization algorithms for Orthogonal Frequency Division Multiplexing (OFDM) system based on the features of underwater acoustic (UWA) channel. The three time synchronization algorithms are analyzed at the first place. Then on the basis of computer simulation, the performance of the three algorithms are compared and tested in the actual lab pool. Latter experimental results...
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