Communication

Providing quality-of-service for frequency-aware Wi-Fi using OFDM-based variable-length Bloom filters
Modern Wi-Fi networks are trending towards using a wider channel bandwidth to achieve high physical layer data rate. The wide channel band experiences fluctuations across the different frequencies, causing diversity in the frequency domain. Frequency-aware Wi-Fi protocols exploit this frequency diversity and consequently achieve high wireless capacity. However, most of the existing works have n...


Planning for the Shaping Force of Cultural Dynamics in a Component Content-Management System Implementation
This tutorial explains how technical communication organizations can improve their chances for a successful component content-management system (CCMS) implementation if they plan for the shaping force of cultural dynamics in the technology diffusion process. Many component content –management (CCM) thought leaders have identified people factors as a major barrier to successful CCMS imple...
R U There? Cell Phones, Participatory Design, and Intercultural Dialogue
This case recounts my experiences during a four-year participatory design project with colleagues in Katanga Province of the Democratic Republic of Congo, where I attempted to develop a system for people working in rural areas to share business information via mobile phones. Research questions: For the first phase of this project: How do businesspeople in Katanga Province use their cell phones ...


Compressive sensing image-fusion algorithm in wireless sensor networks based on blended basis functions
Compressive sensing (CS) has given us a new idea at data acquisition and signal processing. It has proposed some novel solutions in many practical applications. Focusing on the pixel-level multi-source image-fusion problem in wireless sensor networks, the paper proposes an algorithm of CS image fusion based on multi-resolution analysis. We present the method to decompose the images by nonsubsam...
Joint Source and Relay Design for MIMO Multi-Relay Systems Using Projected Gradient Approach
In this paper, we develop the optimal source precoding matrix and relay amplifying matrices for non-regenerative multiple-input multiple-output (MIMO) relay communication systems with parallel relay nodes using the projected gradient (PG) approach. We show that the optimal relay amplifying matrices have a beamforming structure. Exploiting the structure of relay matrices, an iterative joint sour...


A dynamic adjustable contention period mechanism and adaptive backoff process to improve the performance for multichannel mesh deterministic access in wireless mesh LAN
IEEE802.11 s draft proposes a new medium access control function-mesh deterministic access (MDA), which is mainly used for single-channel wireless mesh local area network (LAN). In single-channel environment, collisions between control packets and data packets may occur very often. To completely avoid the collision between control packets and data packets, the mesh delivery traffic indication m...
A New QIM-Based Watermarking Method Robust to Gain Attack
We propose a new watermarking method based on quantization index modulation. A concept of initial data loss is introduced in order to increase capacity of the watermarking channel under high intensity additive white Gaussian noise. According to the concept some samples in predefined positions are ignored even though this produces errors in the initial stage of watermark embedding. The proposed ...

Linear stability of a generalized multi-anticipative car following model with time delays
In traffic flow, the multi-anticipative driving behavior describes the reaction of a vehicle to the driving behavior of many vehicles in front where as the time delay is defined as a physiological parameter reflecting the period of time between perceiving a stimulus of leading vehicles and performing a relevant action such as acceleration or deceleration. A lot of effort has been undertaken to ...
Particle swarm optimization in intelligent routing of delay-tolerant network routing
Delay-tolerant networks (DTNs) are wireless partitioned networks. Because of intermittency, mobile ad hoc network (MANET) routing protocols are not efficient in DTNs. Wildlife tracking, vehicular networks, interplanetary networks, etc. are different applications of DTN. Regarding DTN applications, different parameters should be considered while designing DTN routing protocols. Message delivery ...

HCOR: a high-throughput coding-aware opportunistic routing for inter-flow network coding in wireless mesh networks
Coding-aware routing is an effective approach to create more coding opportunities in inter-flow network coding. To the best of our knowledge, most of the coding-aware routing schemes focus on maximizing the coding opportunities. However, for opportunistic transmission, the throughput is not always increased with the increase of coding opportunities. In this paper, we explore why this case will ...
Specific emitter identification based on Hilbert-Huang transform-based time-frequency-energy distribution features
A novel specific emitter identification method based on transient communication signal's time-frequency-energy distribution obtained by Hilbert-Huang transform (HHT) is proposed. The transient starting point is detected using the phase-based method and the transient endpoint is detected using a self-adaptive threshold based on the HHT-based energy trajectory. Thirteen features that represent bo...

Efficient interference cancellation detector for asynchronous upstream optical code division multiple access-passive optical network with mixed Poisson-Gaussian noise
Optical code division multiple access (OCDMA) is a promising candidate for next generation passive optical networks (NG-PON). OCDMA-PON can potentially provide all customers with a Gb/s-class BW upstream with inherent flexibility. Unfortunately OCDMA suffers from multiple access interference (MAI) and various detection noises. In this study, the authors consider developing efficient interferenc...
Feedback-error-resistant and reduced feedback-rate orthogonal space-time block coding scheme employing single transmit antenna selection
A novel and generic transmit diversity scheme that employs combined single transmit antenna selection (TAS)/orthogonal space-time block coding (OSTBC) scheme with reduced feedback-rate and robust error performance in the presence of feedback errors (FEs) is introduced in this paper. Statistical expressions and performance metrics related to the post-processing signal-to-noise ratio of the propo...
Same rate and pattern recognition search of orthogonal variable spreading factor code tree for wideband code division multiple access networks
Orthogonal variable spreading factor-based code division multiple access systems allocate vacant codes when new call(s) arrive. This study proposes a same rate assignment scheme which allocates a new call to most favourable code in the region crowded by same rate calls. This does not add to blocked codes because of previous calls but utilise the unused scattered capacity created by previous cal...
Preamble design for symbol synchronisation in frequency-selective fading channels
In this study, a two-step method for designing multi-tone preambles is proposed and its performance in the frequency-selective fading channel is optimised. The first step is to find an analytical solution for obtaining the optimum normalised tone frequencies of the multi-tone preamble in order to perform better in frequency-selective fading channel. To measure the quality of the preamble, the a...