Recent Advances in Communications and Networking Technology (Formerly Recent Patents on Telecommunication) (Discontinued) - Volume 5, Issue 1, 2016

A set of M simplex signals is built from a set of M orthogonal signals by removal of the average signal from each of the members of the set. It is known that the dimension of the space spanned by the simplex signals is M-1 . In this article, a set of M-1 orthonormal basis functions is found for the simplex signals. The basis functions are formed by projection of the orthogonal signals in the space that is perpendicular to the average vector. The projected vectors are then orthogonalized by Gram-Schmidt technique and the outputs of Gram-Schmidt algorithm are the basis functions.

Most global enterprises and application service providers need to use resources from multiple clouds managed by different cloud service providers, located throughout the world. The ability to manage these geographically distributed resources requires use of specialized management and control platforms. Such platforms allow enterprises to deploy and manage their applications across remote clouds that meet their objectives. Generally, these platforms are multi-threaded, distributed and highly complex. They need to be optimized to perform well and be cost effective for all players. For optimization to succeed, it has to be preceded by profiling and performance evaluation. In this paper we present techniques to profile such platforms using OpenADN as a running example. The effectiveness of using profiling data with the two factor full factorial design to analyze the effect of workloads and other important factors on the performance, has been demonstrated. It is seen that the workload, of varying number of users and hosts, does not have a significant impact on the performance. On the other hand, functions like host creation and polling have significant impact on the execution time of the platform software, indicating potential gains from optimization.

A recently published technique that is based on the body of revolution approach is applied in this paper to investigate the radiation characteristics of a circular loop antenna as a feed element of a small parabolic reflector. The study shows that, a small parabolic reflector antenna of diameter 0.3 m that is fed by a resonant circular loop at 2.4 GHz can be designed to give a directivity of 12.75 dB with reflection coefficient less than -28 dB based on 75Ω line. The H- and E-plane HPBWs of the antenna are 29.8º and 37.8º respectively. Moreover, the current density on the surface of the loop feed reflector is computed using the body of revolution approach.

Based on semiconductor optical amplifier module, a novel multi-wavelength optical access network with simple ONUs and feeder fiber protection is presented. By innovatively placing semiconductor optical amplifier modules at the remote node, the optical network achieves the simplicity of ONUs and 10 Gbps symmetry downstream/upstream transmissions. On the other hand, by utilizing C+L bands in crossseeding scheme, the band utilization of fibers is improved, the network scale is increased and the coherent interference is eliminated. By using the design of feeder fiber with mutual protection, this structure has good network robustness. By using DPSK orthogonal modulation technology, the system can provide broadcast service. In the end, the system simulation proved that the system has good performance at 10Gbps. The reliability performance meets the basic requirements of communication as well.

The human mobility need for commercial purposes requires another data transfer. This paper proposes a new data transmission model from three communication entities. The model was presented at the Siemens Award in Brazil. This model evaluates the communication flow, thus establishing a network that will describe the user profile and the recommendation based on each user's profile. This paper will show a data management algorithm. Data analysis is a general problem not only in hardware but also in software. Enabling analysis in both scenarios is the advantage of this algorithm.

The uplink and downlink transmissions in Long-Term Evolution (LTE) systems are performed using single-carrier and multicarrier modulation schemes, respectively. To respond such trend, orthogonal time-multiplexed modulation (OTMM) is proposed as several new single-carrier modulation families originated from the orthogonal multiplexed modulation (OMM) families to provide low peak-to-average power ratio and versatile modulations with different degrees in power and bandwidth efficiencies. To further facilitate a software defined radio (SDR) implementation, the proposed OTMM families are incorporated into the original OMM family in a unified signal structure. Typical basis sets are also unified to suit an SDR implementation. To establish a unified modulation platform, the present study therefore proposes a set of orthogonal time-multiplexed modulation (OTMM) families to complement the existing set of orthogonal multiplexed modulation (OMM) schemes. The OTMM and OMM families are integrated in a software defined radio (SDR) modulation structure by means of a common signal model and five unified basis sets. The resulting structure supports both time multiplexing and frequency multiplexing, and therefore offers greater flexibility in improving the power and bandwidth efficiencies of the LTE system. The proposed structure thus attends throughput and signal robustness simultaneously in hostile environments and also provides versatile choices in modulations with low peak-to-average power ratio.

Background: This paper belongs to the series of research documents describing the progress in the specification and development of the T-NOVA framework offering a marketplace for virtual network functions. T-NOVA is an international research project co-funded by the European Commission. Objective: Although, the idea of having a marketplace enabling buying, composing, and deploying “virtual” services on the fly is promising, its implementation or prototyping remains far from realization. This is mainly due to the limitations in the existing cloud computing platforms on top of which the services should be built. Method: In this paper, we discuss the T-NOVA approach and in particular some of the Virtual Network Functions (VNFs) that have been developed in this context. Special attention is paid to the design and specification of the VNFs as well as the related technical challenges that were faced when deployed within the marketplace. Results: Real-world considerations for handling VNF Lifecycles, Monitoring and Networking have also been discussed. We have highlighted two examples of Service Chaining where several VNFs are combined through the T-NOVA Marketplace to create added-value services. Some experiments and test results are also provided. Conclusion: In this paper, we have provided an overview on the T-NOVA Platform with a special focus on the deployment and performances of a wide variety of Virtual Network Functions implemented during the project. It is expected that the challenges and opportunities described in this paper will help foster innovation around NFV and will help pave the way for practitioners and researchers alike to further extend the use of Network Function virtualization in the future.