Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Patent
1996-01-05
1998-10-13
Urban, Edward F.
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
455 84, 375216, H04B 138
Patent
active
058227040
ABSTRACT:
A mobile radio unit having all improved signal processing technique is disclosed. The unit is used in a dual-mode cellular communications system wherein analog and digital channels are used in combination. The mobile radio unit is provided with a front end whereat an incoming radio frequency signal is converted to a corresponding IF. An orthogonal detector is coupled to receive the IF signal and generates in-phase (I) and quadrature (Q) signals. These I and Q signals are respectively digitized by two analog-to-digital (A/D) converters which in turn produce I and Q digital data respectively. A digital signal processor is supplied with the I and Q digital data and demodulates the analog signal using one of the I and Q digital data when the mobile radio unit is using the analog channel while demodulating the digital channel using both the I and Q data when the unit is using the digital channel.
REFERENCES:
patent: 4731796 (1988-03-01), Masterton et al.
patent: 5020076 (1991-05-01), Cahill
patent: 5446422 (1995-08-01), Mattila et al.
patent: 5550893 (1996-08-01), Heidari
patent: 5642378 (1997-06-01), Denheyer et al.
NEC Corporation
Urban Edward F.
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