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Digital Audio Broadcasting

van Katjing Jan

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

2021

Vol. 25, No 3

315--328

Processing digital radio - either on the transmitter or the receiver side - requires a significant amount of digital processing. A receiver for digital radio usually consists of two parts, a ”hardware” part, handling the conversion from an analog antenna signal to a stream samples, and a ”software part”, a decoder, decoding the samples and generating audio, text, images and video. In this paper some aspects of the design and implementation of Qt-DAB, a software decoder for Digital Audio Broadcasting (DAB and DAB+), is discussed. The Qt-DAB decoder runs on a variety of hardware platforms, hardware as small as creditcard sized computers as the Raspberry PI 2, and home computers. In the design performance and flexibility were key. The design is such that it is easy to interface to different hardware SDR devices and easy to add new features. While the core of the Qt-DAB software is formed by the signal processing part, interpreting the incoming sample stream and generating audio, text and images, by far the largest part of the software is handling user interaction and user comfort. Qt-DAB provides a large amount of options, options to select a device, to inspect the signal, to store signals, and options to set the configuration. All in all, it shows that about three quarters of the amount of code is involved is the non-signal processing part.

Implementacja odbiornika RAKE w technice SDR

Siwicki W.

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

2010

nr 2-3

89-93

Przedstawiono sposób działania oraz wyniki symulacyjne odbiornika RAKE wraz z algorytmem estymacji przesunięcia fazowego WMSA. Jest to bardzo prosty algorytm, a zarazem uwzględniający dynamiczne zmiany odbieranego sygnału. Ze względu na możliwość zwiększenia liczby gałęzi w odbiorniku, można go w prosty sposób dostosować do dysponowanej mocy obliczeniowej. Przedstawiono przykładowe wyniki zaawansowanych symulacji opartych na bezpośrednim rozproszeniu widma.

This paper presents functional model and simulation results of RAKE receiver with implemented algorithm of shifted phase WMSA filter. It is very easy algorithm even so it is complying dynamic changes in receiving signal. It is possible to change the number of branches and in this way adapt it to computing resources. This paper includes simulation results.