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Filter bank multicarrier (FBMC) has been taken as a candidate modulation for the 5th generation (5G) mobile network, because it exploits well-shaped prototype filters to reduce the inter-symbol-interference (ISI) and inter-carrier-interference (ICI) in OFDM system. To achieve more flexibility in filter performances, this paper designs nearly perfect reconstruction (NPR) filters by relaxing the Nyquist...
In ultra-dense cellular networks, research works on enhancing cell edge performance receive considerable attention. Based on interlaced clustering, we propose a heuristic sparse beamforming strategy to improve the cell edge throughput effectively in distributed antenna systems (DASs). In our scheme, each cluster pattern (CP) is divided into several adaptive cells, where all the remote antenna units...
Recent works have identified hybrid analog-digital processing as a cost-effective alternative to conventional full-digital processing in massive multiple-input multiple-output (MIMO) systems owing to the deployment of far less number of radio frequency (RF) chains. In this paper, we analyze the impact of oscillator phase noise on hybrid precoding in massive MIMO systems. Relying on the time division...
There is a growing need for government agencies to prevent crimes and terror attacks by legitimately monitoring suspicious communication links. In this paper, two concepts named eavesdropping rate and eavesdropping outage probability are defined to evaluate the eavesdropping performance of legitimate monitor. Against the energy-ratio-based detection exploited by suspicious users, a hybrid eavesdropping...
This paper investigates the performance of bidirectional dynamic networks (BDN) with massive multiple input multiple output (MIMO) systems. In BDN, dynamic allocation of the number of uplink and downlink remote radio heads (RRHs) is proposed, which offers a flexible solution to balance the data traffic asymmetry without requiring the time synchronization. Intuitively, the interference between the...
Coding neural network simulators by hand is often a tedious and error-prone task. In this paper, we seek to remedy this situation by presenting a code generator that produces efficient C++ simulation code for a wide variety of backpropagation networks. We define a high-level, Maple-like language that allows the specification of such networks. This language is compiled to C++ code segments that in...
This paper proposes a system in the form of a textbook for managing geometric knowledge dynamically, effectively, and interactively. Such a system, called an Electronic Geometry Textbook, can be viewed or printed as a traditional textbook and run as dynamic software on computer. The knowledge in the textbook is being formalized by using standard formal languages and may be processed by software modules...
This paper presents a parallelized version of algorithms for computing characteristic sets, characteristic series and irreducible characteristic series of sets of multivariate polynomials, decomposing algebraic varieties into irreducible components and proving theorems mechanically in elementary geometries. These algorithms have been implemented with up to 12 processors in MAPLE system by utilizing...
This book constitutes the thoroughly refereed and revised post-workshop proceedings of the International Workshop on Automated Deduction in Geometry, held in Toulouse, France, in September 1996. The revised extended papers accepted for inclusion in the volume were selected on the basis of double reviewing. Among the topics covered are automated geometric reasoning and the deduction applied to Dixon...
In this paper, we study the uplink (UL) and downlink (DL) ergodic capacity in the bidirectional dynamic network (BDN). By dynamically allocating the numbers of UL and DL remote radio heads (RRHs), BDN facilitates simultaneous UL and DL communications to accommodate the data traffic asymmetry. Assuming that the number of antennas at each RRH (M) is large, we derive the closed-form expressions for the...
A low phase noise voltage-controlled oscillator for mm-wave applications is presented. The oscillator uses switched-capacitor technique to increase the tuning range. The measured results show that the oscillator achieves a phase noise of −100dBc/Hz at 1MHz offset from the carrier frequency of 49.7GHz, while consuming 5.5mA current from a 0.9V supply. A wide tuning range percentage of 12%, i.e. 43...
Developing an effective and efficient appearance model for robust visual tracking is difficult because of various interfering factors, such as postural change, occlusion, and rapid motion. More and more visual tracking methods tend to exploit local sparse appearance model to deal with the above problems. Since in the local sparse appearance model, all individual patch together to form a complete target...
A wide-locking range divide-by-4 static frequency divider for the mm-wave wireless applications is proposed. The capacitive-bridged inductive shunt peaking technique is investigated for widening the locking range and a compact layout area. The divider is realized in 65nm LP CMOS with a small area of 100μm × 160μm occupied. Measurement results show the present divider achieves an operation range percentage...
5G sets stringent requirement on delay, which means large packets have to be segmented into shorter ones. However, the gain of turbo coding can be severely degraded due to short code size. In this paper, a novel coding and encoding scheme is proposed to obtain high coding gain under short size. The idea is to encode multiple short code blocks cooperatively to obtain a long code size. In the process...
Channel coding for the next generation communication system needs to support higher data throughput and transmission rate. Due to the inherent parallel feature, low density parity check (LDPC) codes comply with the target. In this paper, we propose a complete channel coding scheme based on structured LDPC codes. In our design, the correlation among different parity check matrices for different code...
Scaling up the conventional multiple-input multiple- output (MIMO) by orders of magnitude, massive MIMO technique brings huge improvement in spectrum efficiency and energy efficiency. However, under time- division duplex (TDD) operation, the reciprocity calibration need to be necessarily investigated, since the mismatches of the transceiver radio frequency (RF) circuits at both sides of the link will...
When both access points (APs) and user equipments (UEs) have multiple antennas, the block diagonalization (BD) precoding is preferred for the distributed large-scale multiple-input multiple-output (MIMO) systems. In time division duplexing (TDD) operation, the APs can exploit the estimated uplink channel for downlink joint precoding transmission to simultaneously serve multiple UEs, due to the principle...
Two methods for polynomial factorization over algebraic extension fields are reviewed. It is explained how geometric theorems may be proved by using irreducible zero decomposition for which algebraic factoring is necessary. A set of selected geometric theorems are taken as examples to illustrate how algebraic factoring can help understand the ambiguity of a theorem and prove it even if its algebraic...
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