The low transmission power and very large bandwidth used by Ultra-Wide band (UWB) radio systems ,enables them co-exist with other narrow-band systems over the same frequency band without interfering the narrow-band systems. Nevertheless, the interference caused by these narrow-band systems may jam the UWB receiver. Existing narrow-band interference suppression methods for spread spectrum system...

FACULTY OF PHYSICAL AND APPLIED SCIENCE SCHOOL OF ELECTRONICS AND COMPUTER SCIENCE Doctor of Philosophy SPECTRUM MONITOR FOR COGNITIVE RADIO by Siwen Liang The concept of a cognitive radio assumes that the receiver is able to determine the activity level across a large range of spectrum in order to assign a channel for its use. Hence a key function is a spectrum monitor to detect the spectrum a...

Increasing demands of portable wireless devices have motivated the development of CMOS radio frequency integrated circuits (RFIC). In wireless system Low Noise Amplifier is the first stage of any RF Receiver design. Performance of RF receiver mainly depends on the effectiveness of LNA. The main objective of the LNA design is to get good gain with minimum noise generation for the entire operatin...

Bandpass sampling holds much promise for the realisation of software radio receivers, particularly for mobile devices. Sampling at reduced rates eases many of the ADC requirements, and decreases power consumption, thus increasing battery lifetime, and overall receiver size. The need for very high performance programmable devices is also reduced. This paper demonstrates the importance of the ban...

Secondary receivers in Multiple-Input Multiple-Output (MIMO) Cognitive Radio (CR) networks combat interference from primary transmitters while equipped with whitening filters. However, when the MIMO secondary users are employing Radio Frequency (RF) beam-forming networks at the transmitter/ receiver front ends to improve the MIMO transmission performance, the whitening filters cannot perform in...

Radio receiver, as an extensively feasible modern technology, has been widely applied in all fields of military and civil. It is mainly to demodulate all kinds of required signals with strong interference and noise. Based on intermediate frequency (IF) software radio receiver test platform, the data transmission approach combining direct memory access (DMA) and multichannel buffered serial port...

Two techniques are presented in this paper for a software-defined radio (SDR) receiver robust to out-of-band interference. Voltage gain is realized at IF simultaneously with low-pass filtering to mitigate blockers and out-of-band intermodulation distortion. A 2-stage polyphase harmonic rejection (HR) mixer concept robust to gain error achieves 2-6 HR of more than 60dB for 40 samples without tri...

In the last years, the tendency to have a reconfigurable receiver able to offer more than one service at the same time is growing. The receiver must be able, in general, to treat together different signals (i.e. in terms of bandwidth, modulation, received power) without any augmentation of costs of the mobile terminal. The purpose of this paper is to analyse an integration method for positionin...

In this paper, received signal strength indicator (RSSI) is studied for various deployment environments in wireless sensor networks. The accurate RSSI estimation can improve the accuracy of several algorithms used in localization, mobility, and routing. The experiments are conducted to investigate the variation in RSSI values with respect to: a) distance between transmitter and receiver, b) non...

Wireless Sensor Network (WSN) consists of a large amount of low powered nodes which perform tasks like processing, radio transmission-reception, sensing and actuating. To minimize the power consumption in wireless sensor network a dedicated wake-up receiver is used within every sensor node. The wake-up receiver is an additional receiver, which continuously monitors the channel and wakes the res...