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*      RADIO-L :  a discussion of Digital Audio Broadcasting (DAB)    *
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Date: 24 February 1999
From: gerald.chouinard@CRC.CA
Subject: Re: Questions related to DAB

On 25 January, Tracey Daley asked:

=================BEGIN QUOTE=========================================
2) How does the single frequency network help to increase bandwidth
efficiency?
=================END QUOTE===========================================
On 28 January, Simon Mackay responded by describing the ability of
the EU-147 DAB system to operate in an environment where there is a
number of re-transmitters operating on the same frequency, therefore
avoiding the use of additional frequencies to cover a given area.

I would like to add that when a given area is covered by a number of
smaller power re-transmitters, the field strength at the edge of the
coverage area falls off more rapidly than in the case of a higher
power single transmitter. For equivalent coverage, the distributed
emission system will produce less interference to adjacent service
areas than the single transmitter system. Smaller frequency re-use
distances translate into higher spectrum efficiency.

This concept was presented in March 1994 in Toronto at the 2nd
International DAB Symposium. The reference of the article is as
follows:

"Coverage Concepts for Digital Radio Broadcasting at 1.5 GHz, G.
Chouinard, R. Voyer and R. Paiement. Second International Symposium
on Digital Audio Broadcasting, Toronto (Canada), March 1994."

We are finalizing, at the Communications Research Centre, a DAB
coverage of the Ottawa metropolitan area with 4 on-channel
transmitters and we are planning to verify this concept through field
measurements in the coming months. We will publish the results when
they become available.

I hope this is helpful.

Gerald Chouinard

| Gerald Chouinard                || Tel: (613) 998-2500           |
| Communications Research Centre  || Fax: (613) 993-9950           |
| P.O. Box 11490, Station H       || Email:gerald.chouinard@crc.ca |
| Ottawa, Ontario, Canada K2H 8S2 || Web: http://www.crc.ca        |

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