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In this paper, a Multiple-access channel is considered in which transmitters randomly located in the squared-shaped area of width D1. It is assumed the x and y coordinates of each transmitter's position are Uniform random variables and also the receiver is located at the origin. Hence, the distance between any transmitter-receiver pair and consequently, the path-loss term are random variables. It...
This paper presents the design and simulation of a typical Ka band satellite beacon receiver for propagation experimentation. Using satellite beacon signal as a reference signal in satellite wave propagation study is one of the most important methos. Satellite beacons are frequently available for pointing large antennas, but such signals can be used for measuring the effect of natural phenomena such...
In this paper we present the design and characterization of a bandpass filter based on an integrated tunable Active Inductor (AI), to be used as post-selector filter in GSM or general UHF radio receivers. The filter is designed as a discrete element board. It shows a center frequency ranging from of 810 to 980 MHz with Q factor greater than 100. The 1-dB compression point is at OdBm with a resulting...
In this paper, performance of a novel analytic model of direct sequence code division multiple accesses (DS-CDMA) using diversity with maximal ratio combining (MRC) scheme is observed under the influence of multipath Rayleigh fading and multi-access interference (MAI) varying different system parameters and properties of PN sequences. The analysis presents a mathematical expression for bit error rate...
In this article, the design and analysis of sophisticated multi-band quadrature ΣΔ modulators (QΣΔM) are addressed, offering a high-performance and easily-reconfigurable solution for the analog-to-digital (A/D) interface of cognitive radio receivers. Based on spectrum sensing information, the multi-band principle stemming from multi-stage converter implementation enables multiple reconfigurable noise...
We present our recent results on the development of low-noise photonic RF oscillators as well as single sideband electro-optic modulators/mixers enabling novel photonic transmitters and receivers suitable for microwave applications, including phased array systems. In particular, we report on the study and the performance of an all-dielectric RF photonic receiver based on optical whispering gallery...
Energy detectors (ED) and transmitted reference (TR) systems are known as promising candidates for noncoherent UWB receivers. One way of non-coherent communication, is to use a transmitted reference (TR) pulse for detection. In conventional TR, the reference pulse and data bearing pulse are multiplexed in time domain. In frequency shifted reference (FSR) method, these pulses are multiplexed in the...
A network consisting of a point-to-point (P2P) link and a multiple access channel (MAC) sharing the same medium is considered. The resulting interference network, with three transmitters and two receivers is studied from degrees of freedom (DoF) perspective, with and without cognition. Several cognition variants are examined. Namely, the setup is studied with (1) no cognitive transmitters, (2) a cognitive...
In this paper, we analyze the capacity region of a communication network where a Multiple Access Channel (MAC) and a point-to-point channel share a same medium and interfere with each other, where the transmitter of the point-to-point channel has cognitive capabilities. We introduce Multiple Access-Cognitive Interference Channel (MA-CIFC), with a two-user MAC as a primary network and a cognitive transmitter-receiver...
RFID localization is a promising new field of work that is eagerly awaited for many different types of applications. For use in a medical context, special requirements and limitations must be taken into account, especially regarding accuracy, reliability and operating range. In this paper we present an experimental setup for a medical navigation system based on RFID. For this we applied a machine...
Conventional thermal noise phase jitter formula of GNSS receivers' digital phase-locked loop (DPLL) for carrier recovery, which implies that the phase jitter monotonously decreases with the coherent integration time (CIT), can not be used for high-sensitivity DPLL design effectively. Variance comparison between I · Q phase detector (PD) which is normalized by the total power and two-quadrant arctangent...
Known as one spectrum agile transceiver technology in the cognitive radio (CR) contexts, the transform domain communication system (TDCS) has the characteristic of low probability of intercept (LPI) and the capability of multiple access (MA). In this paper, The primary work is to give a detailed description of the FFT-Based channel estimation (CE) in TDCS receiver, which is applied in receiving symbol...
In order to minimize power consumption without sacrificing much latency performance, wake-up radios are employed to assist the main radio for low power channel monitoring. This paper presents the design and implementation of an ultra-low power digital baseband (DBB) circuit for a wake-up radio. In a 90nm CMOS process, the circuit running at a 800kHz clock consumes 3.72μW with a standard 1.2V supply...
In this paper we present the implementation of a FPGA based high data rate BPSK receiver specifically designed to withstand the high dynamics of airborne vehicles (i.e. aircraft, sounding rockets, satellites, etc.). The carrier recovery is implemented through a Costas loop, and a Gardner detector is used for the timing recovery. This architecture was chosen because it provides almost independent carrier...
Numerous interrelated trade-offs are undertaken for any receiver or receive chain design, which must be jointly optimized for the intended operational environment. Some of the requirements resulting from this environment are: noise figure (NF), input 3rd order intercept point (IP3), input 1dB compression point (P1dB), dynamic range, input desensitization level, non-damage input power, out-of-band...
This paper considers iterative carrier recovery for continuous transmission. To overcome the potential cycle slip, we propose to employ the distributed pilots with minor overhead for framing. By extensive simulations, we found that the probability of the cycle slip may be very low and not observed in simulations with distributed pilots for the rate-1/3 LDPC coded QPSK modulation at very low signal-to-noise...
We investigate the use of impulsive ultrawide band (I-UWB) modulation over medium voltage (MV) power line channels for low data rate communications. In particular, we consider a MV network where a channel measurement campaign has been carried out. In this paper, we firstly describe the MV test network. We study the statistics of the MV channels in terms of both root-mean-square delay spread (RMS-DS)...
This paper demonstrates a fully integrated frequency shift keying (FSK) receiver built with standard cells in .18μm CMOS without any off-chip components. Building a receiver with standard cells dictates that an inverter-based ring oscillator, rather than an LC oscillator, will be used for LO generation. This approach reduces the effort required when redesigning the receiver in a different process...
Low frequency (LF) broadcast system is not only an essential platform for the operation of radio watches but also a potential system for various applications such as disaster warning. The front-end IC in the LF receivers is a key component. A low-power, low-noise receiver front-end IC realized in SiGe BiCMOS technology for low frequency (77.5 kHz) time signal broadcast system is presented in this...
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