Robust Sampling Clock Recovery Algorithm for Wideband Networking Waveform of SDR

A novel technique for sampling clock recovery in a wideband networking waveform of a software defined radio is proposed. Sampling clock recovery is very important in wideband networking radio operation as it directly affects the Medium Access adaptive time slot switching rate. The proposed Sampling clock recovery algorithm consists of three stages. In the first stage, Sampling Clock Offset (SCO) is estimated at chip level. In the second stage, the SCO estimates are post-filtered to improve the tracking performance. We present a new post-filtering method namely Steady-State State-Space Recursive Least Squares with Adaptive Memory (S4RLSWAM). For the third stage of SCO compensation, a feedforward Lagrange interpolation based algorithm is proposed. Real-time hardware results have been presented to demonstrate the effectiveness of the proposed algorithms and architecture for systems requiring high data throughput. It is shown that both the proposed algorithms achieve better performance as compared to existing algorithms

A Robust Carrier Frequency Offset Estimation Algorithm in Burst Mode Multicarrier CDMA based Ad Hoc Networks

The future wireless communication systems demand very high data rates, anti-jamming ability and multiuser support. People want large amount of data to be continuously accessible in their personal devices. Direct Sequence (DS) spread spectrum based techniques such as Code Division Multiple Access (CDMA) fulfil these requirements but, at the same time, suffer from the Intersymbol Interference (ISI). Multicarrier CDMA (MC-CDMA) is an emerging technology to be used in mobile devices operating in an ad hoc setting due to its immunity towards ISI and having all the advantages of spread spectrum communication. One of the major problems with MC-CDMA is the high sensitivity towards carrier frequency offsets caused due to the inherent inaccuracy of crystal oscillators. This carrier frequency offset destroys the orthogonality of the subcarriers resulting in Intercarrier Interference (ICI). In this paper, we propose a computationally efficient algorithm based on Fast Fourier Transform (FFT) and biquadratic Lagrange interpolation. The FFT is based on the use of overlapping windows for each frame of the data instead of non-overlapping windows. This gives a coarse estimate of the frequency offset which is refined by the successive application of Lagrange quadratic interpolation to the samples in the vicinity of FFT peak. The proposed algorithm has been applied to the multiuser ad hoc network and simulated in Stanford University Interim (SUI) channels. It has been shown by simulations that the proposed algorithm provides better performance of almost 1~2 dB as compared to the well-known algorithms

Software Architecture Design on National Level for Vaccination Planning and Dispensing System

This paper describes the software architecture design for vaccination planning and dispensing system to be used nationwide in public health-care departments and hospitals in response to the immunization improvement program in underdeveloped and poor countries. The system will help in managing all activities of child vaccination right from their birth by sending alerts to their parents via SMS or voice call in their local language. This automation will help keeping track of particular vaccination against which majority of children are not getting proper vaccination in time and analyze how many chances will be there that the particular disease will spread in that area based on different trends listed in Knowledge base of the health-care system

Adaptive Multi-Input Medium Access Control (AMI-MAC) design using physical layer cognition for tactical SDR networks

Tactical software defined radio (SDR) networks demand stringent requirements of latency, throughput, and reliability. In the past, significant efforts have been made to achieve maximal efficiency with modifications and improvements either in an individual layer or through the cross-layer design of its working protocol. In this paper, we propose a novel cross-layer design consisting of adaptive multi-input medium access control (AMI-MAC) layer along with an intelligent channel allocation scheme supported by a multiband multimode physical layer. A cognitive engine further empowers this cross-layer design approach to achieve high throughput, improved quality of service (QoS), and adaptive range capabilities. The proposed physical layer exhibits a mixed use of narrowband and wideband waveforms accommodating different range requirements as per demanded QoS. The uniqueness of the proposed physical layer enables SDR to operate in hybrid topology by receiving multiple narrowband signals of different bandwidths with the same configuration of wideband RF front end. The proposed AMI-MAC design ensures a reduction in both control and data phase latency. MAC layer ensures the maximal utilization of the time and frequency spectrum. Bandwidth and delay optimization is also managed by the proposed trio of the physical layer, MAC, and cognition to reduce latency and achieve desired QoS. Simulation results are presented to show the superiority of the proposed design over conventional tactical radio MAC

Calculating customer experience management index for telecommunication service using genetic algorithm based weighted attributes

The Customers are the hearts of any industry. Telecommunication being a service oriented industry always prioritizes to find ways of making customers happy, satisfied and loyal. By recognizing this prominence, this paper presents a survey based analysis. A study is conducted to determine what makes customers of Telecommunication Industry satisfied. This paper presents a genetic algorithm (GA) based technique for assigning weights to different attributes of a service based on survey data to find overall customer experience management index (CEMI). Six attributes of service i.e. network coverage, voice call quality, drop call rate, SMS delivery, internet service and call setup duration have been considered in this research to find overall CEMI. The weights for each attribute are optimized by minimizing the error between weighted attributes based calculated CEMI and actual CEMI provided during survey process. The study has been confined within Islamabad City, the capital of Pakistan. The data is gathered through telephonic survey by calling 200 targeted customers of a mobile service provider network in Pakistan. The results indicate that network coverage, signal strength and voice quality are the major factors that highly effect the customer satisfaction. The result of this research proved that there is positive and significant relationship between dependent variables