Orthogonal Frequency Division Multiplexing (OFDM) has become increasingly popular due to its potential applications in digital audio broadcasting, digital terrestrial TV broadcasting, and satellite communication. A notable drawback of OFDM systems is their sensitivity to nonlinear distortion. For maximum power efficiency, amplifiers and transmitters of modern communication systems often operate...

Some digital audio broadcasting systems, such as Satellite Digital Audio Radio Services (SDARS), transmit many audio programs over the same transmission channel. Instead of splitting up the channel into fixed bitrate subchannels, each carrying one audio program, one can dynamically distribute the channel capacity among the audio programs. We describe an algorithm which implements this concept t...

The new digital radio system DAB (Digital Audio Broadcasting), developed within the Eureka 147 project is a very innovative and universal multimedia broadcast system that has the potential to replace existing AM and FM audio broadcast services in many parts of the world in the near future. DAB employs coded OFDM technology that enables it for mobile reception and makes receivers highly robust a...

Orthogonal frequency division multiplexing (OFDM) has been an effective technique to combat multipath fading in wireless communications. It has been successfully used for HF radio applications and has been chosen as the standard for digital audio broadcasting and digital terrestrial TV broadcasting in Europe and high-speed wireless local areas networks. In this paper an overview of a multiple c...

Examining QoS at the end-user level for multimedia broadcasting systems often reveals weaknesses at the specifications of the systems that degrade the overall performance, and of course the satisfaction level of the user of the services. It is the scope of this paper to examine the characteristics of Eureka’s DAB system at the services level, and present some extensions to this system that have...

interoperable communication of complex scenes containing audio, video, synthetic audio, and graphics material. In part 1 of this two-part article (in the previous issue) we provided a comprehensive overview of the technical elements. Here in part 2 we describe an application scenario based on digital satellite television broadcasting, discuss the standard’s envisaged evolution, and compare it t...

Digital Radio Mondiale is a system which promises to re-invigorate the use of the broadcasting bands below 30 MHz. It offers a dramatic improvement in audio quality, not only improving the audio bandwidth and signal-to-noise ratio, but also countering the effects of selective fading and audible interference from other stations. It is also designed to support various features that will make rece...

dard 14496) defines a multimedia system for interoperable communication of complex scenes containing audio, video, synthetic audio, and graphics material. In part 1 of this two-part article we provide a comprehensive overview of the technical elements of the Moving Pictures Expert Group’s MPEG-4 multimedia system specification. In part 2 (in the next issue) we describe an application scenario b...

Bandwidth efficient modulation schemes using Reed-Solomon (RS) codes are proposed for Hybrid In-Band-On-Channel (IBOC) systems that broadcast digital audio signals simultaneously with analog Amplitude Modulation (AM) programs in the AM band. Since both the power and bandwidth allocated for digital audio transmission are limited in this application, the system cannot afford to add enough redunda...

Digital Audio Broadcasting (DAB) is a digital method of delivering radio services from base station to the receiver. The main aim of this paper is to get better reliability of DAB reception in mobile (moving) environment. DAB is very forceful in mobile environment, but in some situations, reception fails in certain spots due to undesired audio interruptions. Antenna diversity systems are consid...