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The millimeter wave communication is largely affected by distance dependent large scale fading. With the recent improvements in accurate localization techniques, location information can be exploited to improve the network capacity in an mm-wave channel instead of the more computationally extensive channel state information (CSI). We discuss how the classical waterfilling algorithm can be applied...
In this paper, a novel two-phase orthogonal frequency division multiplexing-index modulation (OFDM-IM)-aided cooperative relaying protocol is proposed for overlay cognitive radio (CR) networks, where the primary and secondary networks work concurrently over the same spectrum band. In the proposed scheme, OFDM-IM technique is used at the secondary user (SU) to split the transmission space into the...
In this paper, a full-duplex (FD) amplify-and-forward (AF) transmitter cooperative communication scheme is proposed for multiple access channel (MAC). In particular, two FD transmitters simultaneously transmit information to a common receiver and help each other's transmissions with the AF relaying scheme. By considering the accumulation of the residual self-interference and additive noise (RIAN)...
In this paper, analog-and-digital hybrid beamformer design is considered for millimeter-wave (mmWave) wideband multi-user (MU) multiple-input single-output (MISO)-OFDM downlink systems, where a single common analog beamformer is used for all subcarriers while a separate digital beamformer is applied to each subcarrier. By applying a signal-to-leakage-plus-noise ratio (SLNR) approach, an efficient...
This paper considers a diffusion-based molecular communication link where both the transmitter and receiver are molecular circuits. We define the input (resp. output) signal as the number of signalling molecules (output molecules) at the transmitter (receiver) over time. For a given receiver circuit, an open research problem is to find the transmitter circuit that maximises the mutual information...
Although the Z-domain precoding method for blind separation of spatially correlated sources is proved reliable in theory, it has disadvantages in its implementation since it requires knowledge of precoder zeros at the receiver beforehand. A new method is proposed in this article to find these precoder zeros and estimate the separation vectors of the coded signals at the same time by exploiting the...
In this paper, a novel steganography algorithm based on an improved "Matrix Pattern" (MP) method is presented. In this process, firstly, an RGB image is divided into the non-overlapping square-sized blocks. Next, 95 dynamicsized unique matrix patterns are automatically generated using the 4th and 5th bit layers of the green layer of each block, which are assigned to 95 English keyboard characters...
This paper considers a cross-layer design of communication and control layers for wireless state feedback control, and an optimized receiver is proposed. The proposed receiver is a maximum a posteriori probability (MAP)-based receiver that utilizes estimated state information of a Kalman filter-based state observer as a priori knowledge of transmitted state feedback. It takes advantages of the recursive...
This paper studies energy-efficient joint transmit and receive beamforming in multi-cell multi-user multiple-input multiple-output systems. We consider conventional network energy efficiency metric where the users can receive unicasting streams in addition to the group-specific common multicasting streams which have certain rate constraints. The goal is to use the transmission resources more efficiently...
Cooperative localization systems require some kind of communication between the different members of the network. In underwater environments this communication is not trivial, since it is based on acoustic signals that propagate in a challenging environment characterized by multipath, Doppler effect and long delays. To avoid collisions between the different members of the network, usually a Time-Division...
Fountain codes are used in many applications where the channels are time varying and it is difficult at the transmitter to predict the appropriate code rate. In this situation, fixedrate codes are not suitable. Despite the good performance of fountain codes, universally optimal codes do not exist in the finite-length regime. In this paper, we design new fountain codes that are robust to the communication...
Code division multiple access (CDMA) is a widelyused multiple-access scheme in conventional communication systems. In this paper, we consider code division multiple access in molecular communication: since molecular communication has a non-negativity constraint, we consider a nonnegative variant of CDMA that was developed for optical communication. Our results include an information transmission scheme,...
In this paper we present a mobile application and solution for accurate smart indoor positioning. Smart society applications do normally require user location, specifically, in indoor environments high accuracy can enrich augmented or virtual reality, gaming, in-building guidance or support for ambient assisted living. We use encoded ultrasonic signals and TDMA protocol to obtain fine-grained distance...
Trust in SSL-based communications is provided by Certificate Authorities (CAs) in the form of signed certificates. Checking the validity of a certificate involves three steps: (i) checking its expiration date, (ii) verifying its signature, and (iii) ensuring that it is not revoked. Currently, such certificate revocation checks are done either via Certificate Revocation Lists (CRLs) or Online Certificate...
Interference management (IM) is essential to wireless communication networks, but interference suppression, a key component of IM, is known to degrade users' achievable spectral efficiency (SE). It is thus important to select an appropriate IM method with optimal operating parameters according to diverse network deployments, transmit power differences of various communication equipments, and dynamically...
Nowadays, high-bandwidth networks are easily accessible in data centers. However, existing distributed graph-processing frameworks fail to efficiently utilize the additional bandwidth capacity in these networks for higher performance, due to their inefficient computation and communication models, leading to very long waiting times experienced by users for the graph-computing results. The root cause...
Consider a set of point-to-point communication requests in a multi-channel multihop wireless network, each of which is associated with a traffic demand of at most one unit of transmission time, and a weight representing the utility if its demand is fully met. A subset of requests is said to be schedulable without spectral splitting if they can be scheduled within one unit of time subject to the constraint...
This paper presents a novel low power implementation of feed forward equalizer targeted for wireline receivers in high speed SERDES applications. The 3-tap FFE (Feed Forward Equalizer) is configured to cancel precursor and post-cursor ISI. It is implemented by recycling current into a current integrating summer by equally spaced pulse clocks generated using half-rate Rx clock from PLL. Precursor and...
Integrated GPS receivers have become a basic module in location based services, such as position sharing, wild animal monitoring, and location tracking. However, GPS modules have a serious battery drain problem due to their high computation load. This paper aims to reveal the impact of key software parameters on GPS energy consumption, by establishing an energy model for a standard GPS receiver architecture...
Challenged Networks (CNs) are characterized by frequent varying network conditions and intermittent connectivity. In general, CNs emerge in different scenarios including the disaster and emergency situations when the traditional cellular infrastructure is dysfunctional or unavailable as well as in the undeserved areas such as rural and developing regions. This paper aims to evaluate the performance...
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