The performance of wireless communication systems depends on the radio wave transmission path between the transmitter and the receiver. Unlike wired channels that are stationary and predictable, radio channels are extremely random. In addition, electromagnetic wave propagation characteristics vary significantly over different frequency bands. Therefore it is vital to thoroughly understand the p...

Ultra Wideband Radio (UWB) is an upcoming alternative for wireless communications. Since the Federal Communication Commission in the USA allowed UWB for unlicensed usage in April 2002, more and more companies have started developing UWB systems. The major difference with UWB compared to other RF systems is that UWB sends information with pulses instead of using a carrier wave. The technique is ...

A 910MHz high efficiency RF transceiver for Wireless Body Area Network in medical application is presented in this paper. High energy efficiency transmitter and receiver architectures are proposed. In wireless body sensor network, the transmitter must have higher efficiency compared with the receiver because a large amount of data is sent from sensor node to receiver of the base station and sma...

Introduction: Antenna selection scheme was introduced as a low-complexity and low-cost approach for multiple-antenna systems [2]. The idea is to select L antennas out of K antennas (L < K) at the transmitter/receiver side in a way that only L RF chains and a switch are needed in the radio front end. In this Letter, we propose a novel technique to reduce the usage of RF chains in a nT = 2 transm...

Software Defined Radio (SDR) is a new technological development that will allow in future to support entirely new transmitter and receiver functions purely defined by software modules. In particular, such modules will also define the underlying hardware architecture on which the transmitter and receiver algorithms will run. While the development of advanced hardware architectures that can suppo...

This document reports on a carefully designed set of fixed and mobile reception tests in Mexico City on the DRM (Digital Radio Mondiale) system at a frequency in the uppermost shortwave broadcasting band – around 26 MHz – for local broadcasting. The testing was done during July 2005. These were not operational tests; that is, neither the transmitter antenna, nor antenna location, nor transmitte...

This paper discusses wireless systems using antenna arrays at both the transmitter and receiver. Spacetime coding is used to exploit the parallelism of the radio channels formed. Theoretical results on signal-to-noise ratio (SNR) degradation due to imperfect channel estimation are used to determine the optimum ratio of pilot to data symbols to be used in a Rayleigh fading environment. Exact res...

The need for high-rate wireless data transmission with efficient spectrum usage has sparked the development of multiple-input multiple-output (MIMO) systems using antenna arrays at the transmitter and receiver side. Spatial modulation is a new spatial multiplexing scheme promising high data rates. Its performance is affected by certain impairments of the radio channel. The effects of transmitte...

Application Note 2 This application note is written for people who need an understanding of Multiple Input Multiple Output (MIMO) radio operation as it applies to Long Term Evolution (LTE). MIMO (otherwise known as spatial multiplexing) is one of several multiple antenna techniques that are being implemented in LTE; however, this application note will primarily focus on MIMO implementations. In...

Problem statement: Multiple Input Multiple Output (MIMO) wireless communication system is an innovative solution to improve the bandwidth efficiency by exploiting multipath-richness of the propagation environment. The degree of multipath-richness of the channel will determine the capacity gain attainable by MIMO deployment. Approach: Therefore, it is very important to have accurate knowledge of...