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In this paper, a novel orthogonal frequency division multiplexing (OFDM) modulation scheme based on discrete Hartley transform (DHT) combined with optical spatial modulation (OSM) is proposed for visible light communication (VLC) systems. In the proposed scheme, the function of the conventional discrete Fourier transform (DFT) is fulfilled by the DHT and real constellation schemes such as binary phase...
In this paper, we propose an advanced polar encoding scheme with successive cancellation list (SCL) decoder for visible light communication (VLC). As much high-profile channel coding methods, polar codes have achieved the symmetric capacity of binary-input discrete memoryless channels (B-DMCs) based on channel polarization. By taking advantages of simple recursive encoding structure and confirmed...
Device-to-device (D2D) communications can improve the spectrum utilization of cellular networks, but makes the resource allocation and power control much more intractable due to the co-channel interference caused by spectrum reuse. In this paper, we propose a grouping scheme for resource allocation according to the interference limitations and energy efficiency (EE) constraints. Based on the grouping...
By providing substantial gains in terms of both spectral and energy-efficiency, Massive MIMO is expected to be the promising enabler for the fifth generation (5G) communications. However the performance of massive MIMO is greatly affected by pilot contamination due to the insufficiency of pilot sequences. To overcome this, we propose a linear programming based pilot allocation with the purpose of...
High reliability and spectral/power efficiency are key metrics for vehicular communications. The former is due to the requirements for the safety and route related information transmitted; while the latter owns to the conflict between the communication demands of user and limited capacity of vehicular batteries. Bearing these in mind, in this paper we propose a novel quadrature index modulated OFDM...
Vehicle-to-Vehicle and Vehicle-to-Infrastructure (V2X) communication brings about stringent demand for robust and efficient communication techniques under sever Doppler effect and frequency-selective channel environments. Index Modulated Orthogonal Frequency Division Multiplexing with Interleaved grouping (IIM-OFDM), which utilizes the indices of active subcarriers in frequency domain interleaved...
By integrating conventional wireless power transfer (WPT) and wireless information transfer (WIT) into one efficient and creative transmission system, the simultaneous wireless information and power transfer (SWIPT) system has been considered as one promising paradigm for energy harvesting. To make the concept of SWIPT feasible and fully explore its underlying benefits, the practical system design...
In this paper, we present a finite length buffer relaying based incremental hybrid decode-amplify-forward (FLBR-IHDAF) cooperative scheme considering the high data validity instead of instantaneity in cooperative communication. The FLBR-IHDAF scheme originates from the opportunistic relaying based incremental hybrid decode-amplify-forward (OR-IHDAF) scheme and infinite length buffer relaying (ILBR)...
In this paper, a novel trellis coded generalized spatial modulation (TCGSM) scheme is presented and analyzed. Similar to that of the traditional generalized spatial modulation (GSM), a subset of the entire transmit antennas is selected for transmission at each time slot. Nevertheless, in the proposed TCGSM scheme, the bits in the spatial domain are first coded by the trellis encoder before antenna...
In this paper, we present a novel user grouping method for grouped OFDM-IDMA systems. Aiming at maximizing the system capacity, we adaptively distribute the users among the pre-allocated subcarrier groups according to their respective channel conditions. We analyze the achievable capacity of the system and formulate the optimization problem as a weighted bipartite matching problem. Kuhn-Munkres method...
In this paper, the expectation-maximization (EM) algorithm for maximum a posteriori (MAP) estimation is employed to derive an iterative soft-in soft-out (SISO) detection scheme for differential unitary space-time modulation (DUSTM) system employing cyclic group codes. The data sequence produced by conventional differential detection is differentially recoded and used to estimate the channel state...
Interleaver plays a critical role in turbo codes on weight distribution, distance characteristic and error floor performance, different decoding algorithms can also influence error floor and bit error rate (BER) performance of turbo system. In this paper, we give a comparative study on error floor performance of turbo codes with different interleavers as well as decoding algorithms. The results show...
In this work, we propose a novel superposition modulated cooperative scheme for the scenario with multiple source nodes. With the proposed scheme, multiple source nodes are divided into several subsets to cooperate in a Time Division Duplexing (TDD) manner. The transmission of each node is a superimposed signal consists of its own information and the estimated data of nodes in the previous subset...
We present several close-loop four-antenna transmission schemes based on the extended orthogonal space-time block codes (EO-STBCs). Among the proposed schemes, power allocation and phase rotation are taken into account as the partial feedback information to maximize the Frobenius norm of the equivalent channel matrix so as to increase the antenna array gain. We show that the optimal scheme employing...
We present a novel IDM-CORVUS model for the usage of supporting multiple users in cognitive radio systems. Interleave-division-multiple-access scheme is employed in the model as the spectrum sharing strategy for the secondary users. The basic architecture of the proposed model and the model setup are described and analyzed in details. The performance of the proposed model is simulated and the numerical...
In the existing decision tree mining systems, the sample data sets that the decision tree can manage do not include semanteme information, especially for the numerical continuous-valued attributes. In this paper, the necessity and feasibility of researching on numerical continuous-valued attributes semanteme is indicated, and furthermore, a new method for numerical continuous-valued attributes semanteme...
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