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The Long Term Evolution (LTE) has been proposed for supporting higher bandwidth applications and large amount of users by installing many base stations known as eNodeBs. However, in an area, users may associate with some particular eNodeBs which may cause the unbalanced load distribution. In this paper, a heuristic load balance algorithm called Ripple Algorithm has been proposed. The algorithm is...
The theoretical bandwidth constrains of conventional symmetric and asymmetric Doherty amplifiers are evaluated and compared to those of the recently introduced novel three and 4-way Doherty amplifier configurations. Performance trends are identified and backed-up by practical results.
In this paper, we introduce multiple description coding multicast (MDCM) into orthogonal frequency division multiplexing based (OFDM-based) multi-cell cognitive radio networks (CRNs) and investigate the resource allocation problem aiming to maximize the weighted sum rate (WSR). An efficient distributed scheme including subcarrier assignment and power allocation is proposed. During subcarrier assignment,...
We study the game theoretic relay selection in cognitive relay networks under the interference power constraint at the primary receivers and the total available power constraint for the secondary relays. Based on the game model proposed in [1], the problem of relay selection is formulated as a noncooperative game where the rate of cognitive relay network is used as the common utility. This game is...
We propose a heuristic connection rerouting scheme that iteratively bridges and rolls a subset of connections for improving network utilization. The proposed scheme has no disrupted connection and has low computation and control complexity.
Energy efficiency (EE) is growing in importance as a system design criterion for power-unlimited system such as cellular systems. Equally, resource allocation is a well-known method for improving the performance of the latter. In this paper, we propose two novel coordinated resource allocation strategies for jointly optimizing the resources of three sectors/cells in an energy-efficient manner in the...
The delivery of bulk data is an increasingly pressing problem in modern networks. While in some cases these transfers happen in background without specific constraints in terms of delivery times, there are a number of scenarios in which the transfer of tens of GB of data must occur in specific, limited time windows. In order to face this task, a suitable solution is the deployment of virtual links...
Current technologies and architecture result in exponentially escalating costs and do not target revenue generation within the network. They are also complex, failure prone, and power inefficient. Software Defined Networking (SDN) enables network providers to monetize higher layer functions and services based on software and to decouple development from the physical platforms. Carrier rationale and...
A single-chip HEVC (H.265) 8192×4320p encoder is implemented on a 25mm2 die with 28nm process. It dissipates 708mW at 312MHz for 8192×4320p encoding. Frame-level pipelining reduces 8.90 GB/s external memory bandwidth and improve CABAC rate by 50%. A 7.14MB three-level memory hierarchy is designed to support internal 43.38 GB/s bandwidth and 13-port accesses, and reduces external reference frame bandwidth...
The success of multi-tenant data-centers depends on the ability to provide performance guarantees in terms of the resources provisioned to the tenants. As bandwidth is shared in a best-effort way in today's data-centers, traffic generated between a set of VMs affect the traffic between another set of VMs sharing the same physical links. This paper proposes an integrated resource allocation scheme...
FD-MC-CDMA is an attractive candidate for next generation high speed aerial vehicle communication for its high spectrum efficiency and excellent BER performance. Similar to other multi-carrier transmission technologies, FD-MC-CDMA suffers significant performance degradation resulting from intercarrier interference (ICI) in high mobility environments. Particularly, because of the ICI is observed from...
In this paper, we study the coexistence issues of LTE systems operating in the TV white spaces. The study includes a proposal for an appropriate system design as well as a discussion on the LTE system's self-configurability to avoid potential interference to other systems when the resource allocation is made flexible. This is evaluated in terms of achievable PHY-layer throughput and block error rates...
Parallel Sequence Spread Spectrum (PSSS) is a physical layer (PHY) base band technology. It was selected for the wireless sensor network standard IEEE802.15.4-2006, in order to increase data rate and radio performance in fading channels for frequency bands below 1GHz. In the work presented in this paper PSSS is used for the first time in the 60 GHz ISM Band to achieve ultra-high transmission speed...
Space exploration missions have become increasingly complicated and various, and the current deep-space communication schemes can't meet the demand of high-speed and real-time multimedia correspondence. Therefore, the design of a fast and efficient transmission scheme is one of the important ways to solve the conflict. With organic combination of LDPC codes, continuous phase modulation (CPM) and turbo...
Spectrally Efficient Frequency Division Multiplexing (SEFDM) systems offer significant bandwidth gains at the expense of receiver complexity. While Maximum Likelihood (ML) and Sphere Decoding (SD) yield optimum performance, these techniques suffer from an impractical computational complexity. Previous work has shown that hybrid detectors combining Truncated Singular Value Decomposition (TSVD) with...
In this paper we presents a high linearity CMOS up/down conversion double balanced mixer for Impulse Response Ultrawide Band (IR-UWB) applications with a 3.2−4.8 GHz operating frequency. The proposed mixer is intended for high performance, low power integrated UWB communication systems. In particular, the simulated parameters of the proposed mixer make this device particularly suited for cellular...
Content-based publish/subscribe is an attractive paradigm for designing large-scale systems, as it decouples producers of information from consumers. This provides extensive flexibility for applications, which can use a modular architecture. Using this architecture, each participant expresses its interest in events by means of filters on the content of those events instead of using pre-established...
Even though time-interleaved analog-to-digital converters (ADCs) help to achieve higher bandwidth with simpler individual ADCs, gain, offset, and time-skew mismatch between the channels degrade the achievable resolution. Of particular interest is the time-skew error between channels which results in nonuniform samples and thereby introducing distortion tones at the output of the time-interleaved ADC...
Network virtualization enables the co-existence of multiple virtual networks (VNs) on the same substrate network by sharing the available resources. One of the major challenges in network virtualization is the efficient allocation of substrate resources to the VNs - a problem known as Virtual Network Embedding(VNE). In this paper, we propose VNA, an algorithm for VNE that achieves high VN request...
The proposal of Spectrally Efficient Frequency Division Multiplexing (SEFDM) system has added a new dimension for enhancing spectral utilization. SEFDM systems defy the orthogonality principle defined for Orthogonal Frequency Division Multiplexing (OFDM) systems by employing closely packed overlapped subcarriers to save bandwidth. Nevertheless, the loss of orthogonality results in intercarrier interference...
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