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Wireless scheduling has been extensively studied in the literature. Since Maximum Weighted Scheduling has been developed and shown to achieve the optimal performance, there have been many efforts to overcome its complexity issue. In this paper, we develop a novel random access scheduling scheme that maintains constant collision rate. We employ the Additive Increase Multiplicative Decrease (AIMD) control...
In this paper, to maximize the total throughput of secondary users (SUs), we investigate the problem that how to allocate SUs cooperatively parallel sensing multiple primary users (PUs) channels, how to select the best SUs making full use of the available channels, and how to determine the sensing time and detection threshold for each PU channel. To efficient protect PUs from harmful interference,...
We present a reconfigurable GPU-based uplink detector for massive MIMO software-defined radio (SDR) systems. To enable high throughput, we implement a configurable linear minimum mean square error (MMSE) soft-output detector and reduce the complexity without sacrificing its error-rate performance. To take full advantage of the GPU computing resources, we exploit the algorithm's inherent parallelism...
This paper proposes a novel receiver with virtual channels for overloaded MIMO systems, where the number of spatial multiplexing streams is more than that of receive antennas. We propose extended rotation matrices used for the receiver in order to make the receiver performance flexible in terms of complexity and detection performance. A lot of the extended rotation matrices can be formed, even if...
In this paper, an antenna selection and power allocation algorithm is proposed based on user groups for distributed antenna systems. Users are departed into two groups according to their communication environments, one is inner-cell user, and another is cell-edge user. System level simulation plat is built for performance analysis, including cell total throughput, cell-edge user data rate and outage...
Dense small cell (SC) deployments are expected to help handling the explosive growth of mobile data usage. However, the backhaul of these deployments will face several challenges where point-to-point (PTP) and point-to-multipoint (PMP) wireless technologies will be combined forming multipoint-to-multipoint (MP2MP) wireless mesh backhauls. In this context, routing and load balancing solutions will...
The combination of multiple-input multiple-output (MIMO) and Space-Time Block Coding (STBC) is a potential solution for increasing throughput and reliability in data transmission. A pipelined architecture for a Schnorr-Euchner algorithm based sphere decoder used in STBC systems is proposed in this paper. The architecture was designed for a 2×2 antenna system with 16-quadrature amplitude modulation...
Nowadays in optical communications, equalizers to compensate chromatic dispersion have a large impulse response and throughput, therefore the VLSI implementation of this filters are carried out in frequency domain to reduce its complexity and thus achieve a lower power consumption. Designers facing developments of frequency domain filters have defined in advance the throughput and the impulse response...
With the integration of cores increasing, the on-chip-network (NoC) latency and the throughput are getting worse in traditional structures. This paper proposed a novel parameter-based on the hierarchical mesh interconnected NoC (PHMNoC) to improve the integration and performance. We use structural parameters and cross-layer threshold parameter to achieve scalability for different system size and balance...
The paper is devoted to design of the digital components for safety-related instrumentation and control systems using the modern CAD tools. Traditionally, the digital components are built with matrix parallelism that reduces fault tolerance of circuits and safety of systems in their checkability. Circuits with bitwise pipeline data processing have advantage in checkability, but are considered as less...
Thanks to the property of provably capacity-achieving, the recently-discovered polar codes have been taken many attentions. However, the required long code length makes the decoding latency of the successive cancellation (SC) decoder high. This paper presents a new pre-computation look-ahead technique to reduce the decoding latency of SC. Its basic idea is to simultaneously estimate 2ko transmitted...
We consider the problem of scheduling VMs (Virtual Machines) in a multi-server system motivated by cloud computing applications. VMs arrive dynamically over time and require various amounts of resources (e.g., CPU, Memory, Storage, etc.) for the duration of their service. When a VM arrives, it is queued and later served by one of the servers that has sufficient remaining capacity to serve it. The...
For the next-generation mobile communication system, enlarging the system capacity by allowing the use of non-orthogonal user multiplexing has been suggested. In a downlink multicarrier non-orthogonal multiple access (NOMA) system, single or multiple users are allocated to each subband. In NOMA scheduling, a proportional fair (PF) algorithm, where users with few allocated resources are selected on...
Recently, LTE Release 12 and IEEE 802.11ac adopted 256-quadrature amplitude modulation (QAM) as a tool to accommodate high demand of data throughput in wireless systems. Furthermore, currently developing IEEE 802.11ax considers 1024-QAM to further increase the Wi-Fi throughput. In this paper, we propose low complexity schemes in soft detection of high order QAM symbols in multiple input multiple output...
The goal of the present study is to evaluate the Bit Error Rate (BER) of a MIMO-OFDMA multicellular network, when the Regional Anti-Jamming Subcarrier Scavenging (RAJSS) strategy is employed. Throughput and power consumption per mobile terminal (MT) are provided as output metrics, and compared to other subcarrier allocation strategies. The system platform, which is compatible with all studied strategies,...
Device-to-Device (i.e. D2D) communication technology not only magnify system capacity but also utilizes the gain of physical proximity of communicating devices to support services like proximity services, traffic offloading etc. from eNB (i.e. evolved Node-B). D2D communication enhanced resource efficiency and brought down traffic load from eNB in LTE-A networks. Coexistence of D2D users and conventional...
In broadband indoor power line communication (PLC) sys tems, multiple input multiple output (MIMO) techniques have been introduced to address the increasing demand for high data rates under the constraint of limited allocated bandwidth. Whereas the self inter-antenna interference can be dealt with on each subcarrier, both inter-carrier and inter-symbol interference can occur yielding sub-optimal bit...
This paper proposes a dual-connectivity (DC) profile allocation algorithm, in which a central macro base station (MBS) is underlaid with randomly scattered small base stations (SBSs), operating on different carrier frequencies. We introduce two dual-connectivity profiles and the differences among them. We utilize the characteristics of dual-connectivity and their scenarios to reduce the feasible combination...
High-speed and low-area decoders for low-density parity-check (LDPC) codes with very long block lengths are challenging to implement due to the large amount of nodes and edges required. In this paper we implement a decoder for a (32643, 30592) LDPC code that has variable nodes of degree 7, check nodes degrees of 111 and 112, and 228501 edges, making fully-parallel hardware implementation unfeasible...
In this paper, we propose Floating Band D2D, an adaptive framework to exploit the full potential of Device-to-Device (D2D) transmission modes. We show that inband and outband D2D modes exhibit different pros and cons in terms of complexity, interference, and spectral efficiency. Moreover, none of these modes is suitable as a one-size-fits-all solution for today's cellular networks, due to diverse...
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