FM broadcasting

Abstract: PROBLEM TO BE SOLVED: To provide an information transmitting system which can more easily obtain information SOLUTION: An information supplier emits broadcasting information 1010 by using the radio of FM broadcasting and the like from a broadcasting station 1000 The emitting destinations of the radio wave are many and unspecified users 1300, and the content of information are all information on the geographical situation of a city concerned Individual information includes a data type showing the type of information The type of information which the user himself requires is previously registered in a portable terminal 1200 that the user 1300 has by the user 1300 When the portable terminal 1200 receives information, a program for collating the data type in received information with the type of registered and required information, for storing matched information in the portable terminal 1200 when matched information are generated, for displaying them on a display screen or for giving an alarm so as to notify effect that required information is generated is started

Abstract: With the rapid deployment of digital TV, there is an increasing need for accurate point-to-area prediction tools. There is a great deal of propagation models for coverage prediction of DTV. Some of them are pure empirical models, and others are mixed, empirical-analytical models, based on measurement campaigns and electromagnetic theory. The aim of this paper is to compare accurate measurements taken by a Rohde & Schwarz FSH-3 portable spectrum analyzer and precision antennas (biconical and log-periodic), with simulation results derived from coverage prediction models, like the NTIA-ITS Longley-Rice model, the ITM (Irregular Terrain Model) using the 3-arc-second SRTM (Satellite Radar Topography Mission) data that is available freely, and the newer ITWOM (Irregular Terrain with Obstructions Model) model which combines equations from ITU-R P.1546 model with Beer's law and Snell's law. Furthermore, measurements for analog FM broadcasting are compared to predictions from the above mentioned models.

Abstract: Each signal path from an antenna tuner to the common decision feedback equaliser (DFE) has its own channel matched filter (CMF) which optimises the signal/noise ratio at the instants of sampling. The required channel impulse response is estimated with the aid of a training sequence transmitted in the middle of the data frame, and the estimate is tracked to temporal channel variations. After demodulation the multipath fading is reduced by temporal and spatial diversity measures. USE/ADVANTAGE - Esp. in cellular mobile radiocommunication, analogue FM broadcasting can be superseded by digital within same VHF/UHF channel bandwidth to receivers moving at up to 250 km/h.