Reports of the imminent demise of broadcasting and its replacement by the information superhighway are exaggerated. However, the rapid transition to digital technology in all forms of electronic communication is now removing barriers between previously separate media. The almost seamless future telemedia environment will, in a shorter timescale, have an impact at least as great as that of the industrial revolution, changing lifestyles and business structures, challenging current legislation, and increasing the importance of the fifth dimension - our information environment. This paper presents a window on the changes ahead - a survival guide to the fantasy and reality.

Telemedia : A survival guide to the fifth dimension

: It is shown that by changing the weighting factors, the fast Fourier Transform (FET) may be modified to produce a frequency offset. The technique may be used in digital modems to allow a receiver to effectively tune-in to two or more frequencies simultaneously. It may allow improved frequency acquisition in burst transmission systems and improve frequency tracking in conditions where there is rapid rate of change of frequency. (Author)

/pdf/the-offset-fast-fourier-transform-offt-hlrgefm4cx.pdf

The Offset Fast Fourier Transform (OFFT)

The Whitbread Round the World Race is an international yachting event held every four years. The Race attracts major sponsors who demand media coverage throughout its duration. When the yachts are in the vicinity of the shore, conventional techniques can be used to obtain up-to-date broadcast video and audio material. However, when they reach mid-ocean the broadcasters previously relied on old library footage. This paper describes the Yacht Video System (YVS), developed to enable the yachts to relay near-live material from mid-ocean at a quality acceptable for broadcasting. The system uses video compression, satellite communications, and data 'store-and-forward' techniques with a bespoke error correction protocol.

Yacht video system for the whitbread round the world race

Digital Signal Processors (DSPs) have evolved to a level where it is feasible for digital modems with relatively low data rates to be implemented entirely with software algorithms. With current technology it is still necessary for analogue processing between the RF input and a low frequency IF but, as DSP technology advances, it will become possible to shift the interface between analogue and digital domains ever closer towards the RF input. The software radio concept is a long-term goal which aims to realise software-based digital modems which are completely flexible in terms of operating frequency, bandwidth, modulation fonnat and source coding. The ideal software radio cannot be realised until DSP, Analogue to Digital (AID) and Digital to Analogue (D/ A) technology has advanced sufficiently. Until these advances have been made, it is often necessary to sacrifice optimum performance in order to achieve real-time operation. This Thesis investigates practical real-time algorithms for carrier frequency synchronisation, symbol timing synchronisation, modulation, demodulation and FEC. Included in this work are novel software-based transceivers for continuous-mode transmission, burst-mode transmission, frequency modulation, phase modulation and orthogonal frequency division multiplexing (OFDM). Ideal applications for this work combine the requirement for flexible baseband signal processing and a relatively low data rate. Suitable applications for this work were identified in low-cost satellite return links, and specifically in asymmetric satellite Internet delivery systems. These systems employ a high-speed (>>2Mbps) DVB channel from service provider to customer and a low-cost, low-speed (32-128 kbps) return channel. This Thesis also discusses asymmetric satellite Internet delivery systems, practical considerations for their implementation and the techniques that are required to map TCP/IP traffic to low-cost satellite return links.

The application of real-time software in the implementation of low-cost satellite return links

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The application of real-time software in the implementation of low-cost satellite return links