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From: motcid!svoboda@uunet.uu.net (David Svoboda)
Newsgroups: comp.dcom.telecom
Subject: Re: How Will Digital Cellular Increase Capacity?
Message-ID: <16805@accuvax.nwu.edu>
Date: 11 Feb 91 16:37:31 GMT
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X-Telecom-Digest: Volume 11, Issue 111, Message 10 of 12


One capacity limitation of current cellular is available bandwidth.
By lowering the bandwidth required by each speech channel, the total
capacity may be increased while maintaining the current total
bandwidth allotment of cellular.  Assuming that a digital transmission
of raw PCM data would require roughly the same bandwidth as the
corresponding analog signal, the PCM speech data can be compressed by
DSP techniques to require less bandwidth.

In fact, as the US standard now stands, a souped-up LPC technique is
used to achieve a robust three to one capacity increase per RF channel
over analog.


Dave Svoboda, Motorola CID, RTSG, Arlington Heights, IL
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