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Recently, non-orthogonal multiple access (NOMA) has gained more attention as a candidate multiple access scheme for future radio access. A major reason for this is that NOMA has the potential to achieve a more favorable tradeoff between system efficiency and user fairness than orthogonal multiple access (OMA), which is adopted in the 4th generation mobile communication systems such as LTE and LTE-Advanced...
In this paper, the secrecy of a cooperative system consisting of a single source, relay, destination and eavesdropper is analyzed. The threshold-selection decode-and-forward relay is considered, where the relay can correctly decode and forward only if it satisfies a threshold signal-to-noise ratio (SNR). Both destination and eavesdropper take advantage of the direct and relayed transmissions through...
We consider the problem of sending a bivariate Gaussian source over a slow-fading multiple-access channel (MAC) with no channel state information at the transmitters. A joint source-channel coding (JSCC) scheme is constructed using hybrid digital- analog (HDA) coding techniques to minimize the average distortion over the uncertain MAC. Numerical results show that, under Rayleigh fading, the proposed...
In this paper we study the problem of increasing the decoding success probability of random linear fountain code over GF (2) for small packet lengths used in delay-intolerant applications such as multimedia streaming. Such code over GF (2) are attractive as they have lower decoding complexity than codes over larger field size, but suffer from high transmission redundancy. In our proposed coding scheme...
The emergence of Internet-of-Thing (IoT) has driven tremendous growth of number of connected devices such that in the near future everything is connected to the networks forming super-dense networks. To cope with this challenge, this paper investigates networks with multiple relays serving massive number of devices (users), termed as multiway multirelay (MWMR) networks. Coded random access is adopted...
This document aims at offering a concise look into the co-existence of Underwater Telephone and JANUS digital communication methods. This topic is of particular interest as both methods (one a well-established STANAG and the latter in the process to become a STANAG) have partially overlapping frequency bands. The two techniques are briefly described and the specific interference mitigation strategies...
Interference alignment (IA) is a promising interference management technique to improve the achievable degrees of freedom (DOF) and system throughput in a K-user interference network. However, most IA schemes only focus on minimizing the interference leakage power, leading to poor performance at low to moderate SNRs. In this paper, we put forward a novel algorithm, namely, sum-rate improved interference...
This paper presents the impact of adjusting the clock frequency on our bus called Encoder-Decoder Bus System. The integrated circuits for encoder and decoder (MC145026/MC145027) are used to implement our bus system based on Arduino Uno R3 microcontroller. We consider that the clock frequency of encoder and decoder may affect to the data transfer rate between the source and destination nodes. We select...
In this paper, a low cost ID broadcasting indoor location system using visible light communication (VLC) on a mobile device is proposed. Each LED lamp is given a different ID, corresponding to a location in the map stored in the Android App. LED lamps broadcasts its ID using on-off keying (OOK) modulation and BCH (Bose-Chaudhuri-Hocquenghem) coding so that a mobile device with a photodiode (PD) can...
Compared with energy-harvesting transmitters, the performance of energy-harvesting receivers has not been fully investigated. The main consumption of energy at transmitters is for transmission, while that at receivers is for information decoding. Hence, the analysis and optimization of energy-harvesting transmitters and receivers are inherently different. Motivated by the above, in this paper, we...
This paper proposes the design of an 8-bit segmented current steering (CS) digital to analog converter (DAC), which uses Chinese abacus technique to improve both static and dynamic performances. Chinese abacus DAC is simple, occupies less area and shows better linearity compared to binary DAC. In conventional segmented CS architecture, the MSB is implemented in unary and LSB is implemented in binary...
This paper considers an artificial noise (AN)-aided transmit design for multi-user MISO systems in the eyes of service integration. Specifically, three sorts of services, i.e., multicast message transfer, confidential message transfer and energy transfer, are combined and offered simultaneously. The confidential message is kept perfectly secure from all receivers except an authorized receiver. Assuming...
This work proposes a transceiver architecture for the OFDM PHY of IEEE802.15.4g standard targeting Smart Metering Utility Networks. It also details the main components implemented for preliminary hardware prototyping. The OFDM transceiver is part of a project that is under development and aims to implement in ASIC the three PHYs defined by the IEEE802.15.4g standard, i.e. MR-FSK, MR-OQPSK and MR-OFDM...
In this paper, we focus on the performance imimprovement of the network coding (NC) based hybrid automatic repeat request chase combining (HARQ-CC) scheme. First, considering the joint detection method with the conventional log- likelihood ratio (LLR) calculation, we design the optimal pair of constellation mappings for bit error rate (BER) minimization. Furthermore, we propose a novel remapping-based...
Abstract-Interference is a key problem for multi-cell networks and interference alignment (IA) is a promising method to manage interference. This paper investigates whether a feasible IA scheme can improve the system performance of Device-to-Device(D2D) communication underlaying multiple-input-multiple-output (MU-MIMO) uplink in multi-cell networks. We propose a novel cell division pattern based on...
Joint decoding is employed in many coding schemes to achieve a larger rate region. However, decoding complexity escalates considerably when joint decoding is used. This paper studies the achievable sum-rate of the two-user Gaussian interference channel when joint decoding is replaced by successive decoding. When interference is weak, it is shown that, for a wide range of transmitters' powers, rate-splitting...
This paper considers a hybrid cochannel MIMO cellular network with both cellular and device-to-device (D2D) users, and studies, from a new perspective, mode selection (cellular or D2D mode) for the potential D2D users joining the network. We propose a new mode selection scheme that takes into account not only the interference caused to the potential D2D users, but also the interference caused by the...
The space-time trellis coded orthogonal frequency division multiplexing (STTC-OFDM) has been implemented with the conventional maximum-likelihood decoder for multiple antenna transmission since the STTC-OFDM was initially proposed. In this paper, a modified maximum-likelihood decoding method with the utilization of a multiplexer at the transmitter and a demultiplexer at the receiver to isolate each...
In this paper, decentralized heuristic access policies are designed for two secondary users (SUs) in an underlay cognitive radio network in which the PU employs Type-I Hybrid ARQ. Exploiting the redundancy in PU retransmissions, each SU receiver applies interference cancellation (IC) to remove a successfully decoded PU message in the subsequent PU retransmissions. There is no central control unit...
In this paper, we analyze Luby Transform (LT) codes with unequal recovery time (URT-LT) and intermediate feedback. Different sets of information symbols within a message block are allocated different priorities, where the higher prioritized sets are to be recovered in a shorter time. We divide the encoding process into stages where in each stage different sets are allocated different selection probabilities...
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