This letter presents a fronthaul signal compression scheme based on linear prediction coding adapted to the orthogonal frequency division multiplexing signals. The proposed method is capable of providing fine tuning factor, which an alternative legacy methods that tune factor by changing discrete number bits quantizer, and consequently, are only able do so with coarse resolution.

This work explores clock synchronization algorithms used to process timestamps from the IEEE 1588 precision time protocol (PTP). It focuses on PTP-unaware network scenario, where nodes do not actively contribute PTP's operation. scenario typically imposes a harsh environment for accurate distribution, primarily due packet delay variation experienced by PTP packets. In this context, it is essential noisy measurements using and strategies that consider underlying models. surveys some...

Provisioning of cost-effective Ethernet-based fronthaul by reusing the LAN infrastructure available in most commercial buildings is challenging predominantly terms required bandwidth and synchronization. In contrast to a synchronous fronthaul, PTP-based Ethernet network must cope with estimation noise introduced packet delay variation (PDV) for synchronization recovery. The SYNC used PTP on such networks expected suffer from significant PDV due traffic other background traffic. Further...

This work investigates a mechanism for alignment of the timing on which spatially distributed and cooperative radio units transmit in radio-frequency (RF) when served over packet-based fronthaul. It analyzes problem by considering imperfect clock synchronization packet delay variation that fronthaul packets are subject to. Following analysis, this paper proposes an implementation architecture RF transmission based synchronized triggering among centralized processing units. Throughout...

G.fast is the most recent ITU-T standard for copper-based transmission, which targets at short distances and adopts a bandwidth of 106 MHz extensible to 212 MHz. In several scenarios systems will be composed by or coexist with uncoordinated lines, are sources strong crosstalk. This work focuses on evaluating an alien (out-of-domain) crosstalk mitigation method based noise prediction that was proposed predecessors G.fast. Simulation results show methods can indeed improve performance systems,...

The synchronization accuracy achieved via the IEEE 1588 Precision Time Protocol (PTP) in packet-based fronthaul networks is substantially impaired by packet delay variation (PDV). Nevertheless, particular case of deployment over tree topologies, it known that PDV can be avoided controlling departure PTP packets such they experience close to constant delays fronthaul. This paper analyzes controlled under constraints are peculiar a scenario interest and considering radio traffic itself behaves...

Flexibility is a key capability to allow future 5G networks support varying service offerings over common infrastructure. 5G-PICTURE investigates the design of programmable compute and transport network infrastructures, able instantiate third-party connectivity services on demand. This paper introduces vision an integrated compute, RAN architecture, describes set innovative functions in RAN, Transport Synchronization domains that has developed fulfill its vision. Initial evaluation results...

Cloud radio access network (C-RAN) is a recent trend of RAN architecture positioned to help the operators address challenges new wireless services, such as emerging 4G and 5G mobile networks. C-RAN uses baseband processing units in central server which connects front-ends at cell sites via so-called fronthaul network. The infrastructure currently provided by CPRI (Common Public Radio Interface) OBSAI (Open Basestation Architecture Initiative) industry standards use dedicated optical links...

The cyclic prefix adopted by discrete multitone (DMT) systems may impose a data rate reduction or be insufficient to prevent inter-symbol and inter-carrier interference from distorting the received symbols degrading system performance. Thus, techniques that are able this distortion while maintaining low power consumption reasonable complexity attractive. This works develops structure mitigate combining transmitter-based precoder receiver equalizer operating in time domain DMT symbols....

The requirement of higher data rates motivates the adoption high-order modulations and pulse shaping in optical systems. This paper proposes an efficient architecture for FPGA-based parallel fractional sample rate conversion that has optimum computational cost. supports non-integer oversampling factors, which allow increased flexibility when compared to schemes limited adopting one or two samples per symbol, example. presented example is evaluated a spectrally-efficient 400G supper-channel...

In fifth-generation (5G) mobile communications and beyond, clock synchronization is essential for base stations to perform time-coordinated transmissions. particular, the IEEE 1588 precision time protocol (PTP) industry standard precise over a packet-based network. this context, algorithms play fundamental role achieve more accurate robust estimates by improving stability against packet delay variation (PDV), environmental phenomena other sources of uncertainty. paper, we use datasets...

This paper discusses the application of long short-term memory (LSTM) neural networks to maintain synchronization a real-time clock in holdover operation, that is, while timing reference input is unavailable. The approach trains LSTM network based on timestamps acquired slave locked its coming from master clock. When loses and enters mode, takes over controls We evaluate method testbed consisting IEEE 1588 Precision Time Protocol (PTP) clocks field-programmable gate arrays (FPGA), where we...