Telecommunications – Transmitter and receiver at separate stations – Plural transmitters or receivers
Reexamination Certificate
1999-02-26
2001-11-27
Hunter, Daniel (Department: 2684)
Telecommunications
Transmitter and receiver at separate stations
Plural transmitters or receivers
C455S119000, C455S139000
Reexamination Certificate
active
06324407
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to wireless communication systems and, in particular, to a method and apparatus for transmitting signals in such wireless communication systems.
BACKGROUND OF THE INVENTION
A typical problem encountered by remote units within wireless communication systems is that of multi-path fading. During multipath fading, a signal that is transmitted to a remote unit is canceled (via destructive interference) by the same signal that has been reflected off of an object. This is illustrated in FIG.
1
. As shown in
FIG. 1
, signal
103
that is transmitted to remote unit
101
is reflected off surface
102
. In many cases, the reflected signal
104
will destructively interfere with incoming signal
103
, causing a multi-path fade. At the point where the two signals destructively interfere, remote unit
101
may be unable to receive incoming signal
103
, possibly resulting in a dropped call. Therefore a need exists for a method and apparatus for transmitting a signal within a communication system that reduces the chance that a signal will undergo multi-path fading.
REFERENCES:
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patent: 5570350 (1996-10-01), Myer et al.
patent: 5625871 (1997-04-01), Myer et al.
patent: 5694395 (1997-12-01), Myer et al.
patent: 5796307 (1998-08-01), Kumagai et al.
patent: 6131016 (2000-10-01), Greenstein et al.
Gofron Kazimierz J.
James Brian D.
Kapoor Vikram
Neumiller Phillip D.
Sadzius Dorothy M.
Haas Kenneth A.
Hunter Daniel
Motorola Inc.
Nguyen Thuan T.
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