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The new standard for narrowband PLC-based communications IEEE P1901.2 defines two mechanisms which do not exist in the majority of its wireless counterparts — dynamic frequency mapping (tone mapping), and existence of several modulations. Until now, the benefit of these mechanisms was not taken explicitly into account by the routing protocols. In this paper, we propose a novel metric for RPL — the...
In this 15.875paper, we propose a method to achieve high data rates using a shortened orthogonal frequency division multiplexing (OFDM) frame format in the physical layer (PHY) for narrowband power line communication (NB PLC) systems. The new frame structure will combine the preamble and information in the same OFDM symbol so that the overhead from the preamble is reduced. Then we consider the optimal...
In this paper, we present a new approach that seeks reducing the downlink TBS-index by the LTE-A eNodeB. Our objective is to minimize the total transmitted power based on getting the benefit from available but unused PRBs, while considering the QoS for the UEs and mitigating the interference from adjecent eNodeBs. Most previous studies have not assigned the residual PRBs in the eNodeB to change the...
Recent, as interest in the vehicle communication is high, various techniques have been developed. However, the vehicle communication has a problem due to high-speed mobility of vehicle. Especially V2I (Vehicle-to-Infrastructure) communication has a biggest problem that is deterioration of continuity and reliability caused by frequent hand-off with base station due to high-speed mobility of vehicle...
The results of design and preliminary open path testing mobile tropospheric communication system are discussed. Practical recommendations to improve the characteristics of quality in mobile tropospheric communications systems are made.
As the perpetually increasing demands of users for high speed, higher data rates over wide bandwidths, lower system latencies in mobile communications, LTE/LTE-Advanced as a 4th Generation of Wireless networks infrastructures widely deployed to provide better support for these requirements. Carrier Ag-gregation(CA) is an important technology for LTE-A providing enhancements to peak data rates, both...
In this paper we review a class of the Continuous Phase modulation (CPM), namely, the Quaternary Frequency Shift Keying (CP-QFSK) signaling and investigate its suitability for the application in mobile radio systems. This type of modulation renders its self as a spectrally efficient scheme that is currently used in a wide variety of applications ranging from communications systems to sonar, geophysics,...
In this paper, we consider a multi-user communication system with dynamically varying interference on block fading channels. We focus on a multi-antenna receiver, single-antenna transmitters, and the case in which the receiver has no knowledge of the channel state information, interference dynamics, and the variance of the additive noise. Pilot-assisted transmission techniques are employed to enable...
In wireless communication networks, transmitter power control can play an important role in various communication scenario, like power control, throughput and quality of service (QoS). It is essential to find effective means of power control point-to-point, broadcasting and multi-casting. We consider the problem of unicast or point-to point (peer to peer) communication in wireless networks in the...
In this paper, we propose a new spatial modulation (SM) scheme using quaternary quasi-orthogonal sequences (Q-QOSs) for any multiples of four transmit antennas. The new scheme is an extended work of conventional Q-QOS-SM, which is designed only for antennas of powers of two. Unlike the original Q-QOS-SM, the new scheme adopts the QOS of length 4 for all applied antennas, which enables more design...
Gen 2 modulation schemes for RFID tags operate well below theoretical limits of throughput for backscatter modulation. This paper demonstrates how coding concepts from magnetic and optical recording media can be adapted to boost date rates through the RFID channel. Without sacrificing power consumption, simplicity, or current RF hardware designs, current tag throughputs are shown to increase by at...
Several techniques such as carrier aggregation (CA) and cognitive radio (CR) have been proposed to achieve high data rates to meet the demand of future wireless communication systems. Those techniques pose a strict adjacent channel interference (ACI) requirement. However, currently employed orthogonal frequency division multiplexing (OFDM) systems suffer from significant spectrum leakage and require...
This paper presents experimental results on downlink transmission and beam tracking performance in an indoor shielded room environment using a Proof-of-Concept (PoC) system targeting 5G millimeter wave (mmW) radio access. Experiments in mmW targeting under mobility and beam tracking with narrow beams in reflective environment have not yet been conducted. The mmW transceiver is implemented with analog...
Colour shift keying (CSK) is a visible light communication (VLC) modulation scheme, designed for multi-colour light emitting diodes (LEDs), standardised in IEEE 802.15.7. The standard specifies a Reed-Solomon (RS) encoder for the CSK physical layer (PHY). Currently, no investigations have been made to analyse the performance of the RS coded CSK. This paper details, that the CSK systems yield to soft...
In this paper, we attempt to improve the efficiency of random access employed for a massive number of energy-constrained M2M devices to transmit their data to a base station (BS) by exploiting relaying and interference cancellation (IC). Each device transmits a single packet with a minimum required power, which is then forwarded by surrounding relay(s) to derive a benefit of IC at BS. While IC can...
In this paper, a novel adaptive coded-modulation scheme, namely M-ary coded modulation, which is spectrally-efficient and can facilitate variable data-rates, is proposed to meet different quality-of-service (QoS) requirements for wireless multimedia applications. An efficient constellation subset selection algorithm incorporated with a novel M-ary coding technique is proposed to generate convolutional...
Si waveguide side-wall angle dependant resonance characteristic of a micro ring-resonator is presented. The peak resonant wavelength and the modulation depth have changed significantly due to the changes of side-wall angle.
When optimizing an optical network should we adapt the SNR to the signal or adapt the signal to the available SNR? We show both approaches give comparable results but have different complexity trade-offs.
Transceivers employing square PM-QAM with up to two FEC overheads are optimized based on the SNR distribution. For NSFNET two FEC overheads with PM-16QAM give an 82% throughput increase compared with PM-QPSK with 7% overhead.
In this paper, we propose an energy efficient cross-layer design framework for transmitting Markov modulated Poisson process (MMPP) traffic over Nakagami-m fading channel with delay demands. The adaptive modulation and coding (AMC) is used at physical layer. We first investigate the stationary distribution of this system. With the stationary distribution and the AMC transmission mode, we derive the...
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