Radio communication systems
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United States of America Patent
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-
Nov 28, 1995
Grant Date -
N/A
app pub date -
Apr 27, 1993
filing date -
May 27, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
CDMA (Code Division Multiple Access) can be used in cellular mobile radio systems to provide good spectral efficiency through averaging the interference wherever the number of users per carrier is large (several tens). This is readily practicable for voice users whose data rate requirements are modest but requires large spreading factors for ISDN data service users. This invention proposes an approach in which a multiplicity of CDMA carriers each with relatively low bandwidth are used for the voice services and overlayed with wide bandwidth CDMA carriers whose bandwidth occupies the whole (or most) of the band occupied by all of the narrowband CDMA carriers in order to service the data users. This allows the same RF band to service a relatively small number of data service users with wideband (and therefore higher cost) terminals without affecting the cost of terminals for the majority of voice users.
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