Using maximum weight matching algorithm, the crossbar switch with VOQ is proven to be stable and can achieve 100% throughput even under non-uniform traffic pattern. However, maximum weight matching has a high complexi...
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Using maximum weight matching algorithm, the crossbar switch with VOQ is proven to be stable and can achieve 100% throughput even under non-uniform traffic pattern. However, maximum weight matching has a high complexity of order O(N 3 ) that is not scalable to fast line rates, neither to high port counts. The scheduling based on Birkhoff-von Neumann decomposition of traffic matrices completely eliminates online computation, which provides a promising solution to the scalability of packet switches. The BvN switch can provide predictive performance under smooth input traffic; however, its performance deteriorates with increasing traffic burstiness. We propose a hybrid scheduling scheme, which combines BvN and maximum weight matching. The hybrid scheduling scheme is proven to be stable with constant shares of MWM and BvN patterns in a cycle. As a variant of the hybrid scheme, we also propose a competitive scheduling algorithm which adjusts shares of MWM and BvN automatically with O(N) online computation. According to simulation results, the hybrid scheme with the competitive scheduling algorithm is burst-tolerant; it can serve as a compromise between computation complexity and switch performance in the face of bursty input traffic.
We proposed a size-scalable and cost-efficient OXC architecture using limited port fine-granularity bandwidth-variable wavelength selective switches and waveband selective switches for elastic opticalnetwork, as well...
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We proposed a size-scalable and cost-efficient OXC architecture using limited port fine-granularity bandwidth-variable wavelength selective switches and waveband selective switches for elastic opticalnetwork, as well as a routing and spectrum allocation scheme.
In this paper,we review optical switching experiments of Nyquist superchannel with flexible bit *** various switching data capacities of 40,100 and 400-Gb/s are achieved by employing adaptive multi-level or hybrid qua...
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In this paper,we review optical switching experiments of Nyquist superchannel with flexible bit *** various switching data capacities of 40,100 and 400-Gb/s are achieved by employing adaptive multi-level or hybrid quadrature amplitude modulation(QAM)*** aggregate superchannels with enough guard bands for optical superchannel switching with slight error vector magnitude(EVM)*** also demonstrate Terabit optical switching functionality of polarization division multiplexed(PDM)64-QAM signals with Nyquist pulse shaping.
We propose a rectangular optical filter based on stimulated Brillouin scattering in fiber with tunable bandwidth from 50 MHz to 4 GHz at 15-MHz tuning *** steep-edged rectangular shape of the filter is precisely contr...
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We propose a rectangular optical filter based on stimulated Brillouin scattering in fiber with tunable bandwidth from 50 MHz to 4 GHz at 15-MHz tuning *** steep-edged rectangular shape of the filter is precisely controlled utilizing digital feedback revision of the pump *** passband ripple is~1 dB by nonlinearity management of the pump and using the fiber with a single Brillouin *** extinction ratio of the filter is further enhanced using the polarization characteristics of the Brillouin *** on this filter,we demonstrate a sub-band extraction of a multi-band orthogonal frequency division multiplexing signal,which shows the potential ability of the filter in the fields of optical and microwave signal processing.
A stacked WDM-OFDM-PON downlink transmission is experimentally demonstrated with adaptive-rate from 1.25Gbps, 2.5Gbps, 5Gbps to 10Gbps per wavelength. 25%～49% and 12%～20% of the power can be saved for ONU and OLT wh...
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ISBN:
(纸本)9781479950485
A stacked WDM-OFDM-PON downlink transmission is experimentally demonstrated with adaptive-rate from 1.25Gbps, 2.5Gbps, 5Gbps to 10Gbps per wavelength. 25%～49% and 12%～20% of the power can be saved for ONU and OLT when using adaptive-rate modulation.
Optimal gain spectra minimizing distortion and enhancing delaying efficiency in linear slow light systems are predicted and experimentally validated by shaping the gain spectral profile in a Brillouin fiber amplifier....
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To handle the handover challenge in Express Train Access networks(ETAN).mobility fading effects in high speed railway environments should be addressed *** on the investigation of fading effects in this paper,we obtain...
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To handle the handover challenge in Express Train Access networks(ETAN).mobility fading effects in high speed railway environments should be addressed *** on the investigation of fading effects in this paper,we obtain two theoretical bounds:HOTiming upper bound and HO-Margin lower bound,which are helpful guidelines to study the handover challenge today and in the ***,we apply them to analyze performance of conventional handover technologies and our proposal in *** follow-up theory analyses and simulation experiment results demonstrate that the proposed handover solution can minimize handover time up to 4ms(which is the fastest one so far),and reduce HO-Margin to 0.16 dB at a train speed of 350km/h.
We achieved 51-nm bandwidth noise-like pulse using a polarized graphene saturable absorber made of gold-coated graphene on D-shape *** launching the high energy noise-like pulse into high nonlinear fibre,1000-nm wide ...
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We achieved 51-nm bandwidth noise-like pulse using a polarized graphene saturable absorber made of gold-coated graphene on D-shape *** launching the high energy noise-like pulse into high nonlinear fibre,1000-nm wide supercontinuum spectrum was obtained.
作者：
Min ChenAnpeng HuangLinzhen XiemHealth Lab
School of Electronic Engineering and Computer Science PKU-UCLA Joint Research Institute and State Key Lab of Advanced Optical Communication Systems Peking University
In Orthogonal Frequency Division Multiplexing (OFDM)-based mobile networks (e.g., Long Term Evolution advanced), Downlink Control Information (DCI) in a Physical Downlink Control Channel (PDCCH) plays a unique role in...
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ISBN:
(纸本)9781479935130
In Orthogonal Frequency Division Multiplexing (OFDM)-based mobile networks (e.g., Long Term Evolution advanced), Downlink Control Information (DCI) in a Physical Downlink Control Channel (PDCCH) plays a unique role in carrying control signaling and scheduling information, which enables the flexibility and diversity of radio resource utilization. Due to system configuration limitations, power dimension is the only potential to enhance DCI reliability. Based on this motivation, we apply the synergy concept to power dimension: called Power Synergy, which can deal with negative effects caused by Cell-specific Reference Signal (CRS) power boosting, and also allow flexibly power lending between OFDM symbols in the physical control region. Under the constraints of the Block Error Rate (BLER) threshold 10~(-2) given for PDCCHs and the CRS full-cell coverage requirement, performance tests reveal there are significant profits (for example, 10-dB gain available for enhancing DCI reliability in the worst case) from the power headroom in the physical control region. This valuable gain is helpful to accommodate emerging mobile broadband services (e.g., mobile health) in LTE/LTE-A networks.
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