Multiple mode capable radio receiver device

Details Multiple mode capable radio receiver device Multiple mode capable radio receiver device

1997-05-12

2001-01-02

Patel, Ajit (Department: 2733)

Multiplex communications

Communication over free space

Combining or distributing information via code word channels...

C455S552100

Utility Patent

active

06169733

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to wireless and particularly but not exclusively to radio receivers used in mobile communication systems.
BACKGROUND OF THE INVENTION
There are currently many different radio standards in existence in North America and elsewhere. For example, in North America the frequency band 824-894 MHz (824 to 849 MHz for handset transmit and 869 to 894 MHz for handset receive) is reserved for cellular communication systems among which are AMPS (Analog Mobile Phone System) analog cellular defined by the standard EIA/TIA-553 (Electronic Industry Association/Telecommunications Industry Association Standard 553), TDMA (Time Division Multiple Access) digital cellular defined by the standard EIA/TIA/IS-136 (where IS means Interim Standard) and CDMA (Code Division Multiple Access) digital cellular defined by the standard EIA/TIA/IS-95. The frequency band 1850-1990 MHz (1850 to 1910 MHz for handset transmit and 1930 to 1990 MHz for handset receive) is, on the other hand, reserved for PCS (Personal Communications Systems) and the two main standards operating in this band are J-Std-009 which defines upband TDMA and J-Std-008 which defines upband CDMA.
A radio receiver designed to operate in compliance with one of the standards is not generally able to operate with any of the other standards.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a single radio receiver which is able to communicate with a plurality of different radio systems.
According to one aspect, the present invention provides a radio receiver for reception of radio signals encoded according to a plurality of different protocols but transmitted within a common frequency band, the receiver comprising: at least one downconversion stage for deriving baseband information in a selected frequency band having a width substantially equal to the maximum channel width used in the different protocols; an A/D conversion stage for converting the baseband information in the selected frequency band to digital information; and a digital signal processor for processing the digital information corresponding to the baseband information in the selected frequency band, wherein the digital signal processor first determines whether the digital information corresponds to a single channel of a first particular one of the protocols, if the digital signal processor determines that the digital information corresponds to a single channel of the first protocol the digital signal processor processes the digital information according to the first protocol, if the digital signal processor determines that the digital information does not correspond to a single channel of the first protocol the digital signal processor subsequently filters out a single channel of another particular one of these protocols, determines whether the digital information in the filtered single channel corresponds to the other protocol and, if it does correspond, processes the digital information in the filtered single channel according to the other protocol.
In a preferred embodiment the common frequency band is 869-894 MHz and the different protocols are AMPS, CDMA and TDMA, and the selected frequency bandwidth of the baseband information is 1.25 MHz.
Alternatively or additionally the common frequency band is 1930-1990 MHz and the different protocols are CDMA and TDMA, and the selected frequency bandwidth of the baseband information is 1.25 MHz.
The invention also provides a radio receiver comprising a first receiver portion for reception of radio signals encoded according to a plurality of different protocols but transmitted within a first common frequency band and a second receiver portion connected in parallel to the first receiver portion for reception of radio signals encoded according to a plurality of different protocols but transmitted within a second common frequency band, the first receiver portion comprising: at least one downconversion stage for deriving baseband information in a selected frequency band having a width substantially equal to the maximum channel width used in the different protocols; the second receiver portion comprising: at least one downconversion stage for deriving baseband information in a selected frequency band having a width substantially equal to the maximum channel width used in the different protocols; the radio receiver further comprising: an A/D conversion stage connected to outputs of the first and second receiver portions for converting the baseband information in the selected frequency band to digital information; and a digital signal processor for processing the digital information corresponding to the baseband information in the selected frequency band, whereby the particular protocol used can be discerned and the digital information processed accordingly.


REFERENCES:
patent: 5668837 (1997-09-01), Dent
patent: 5745480 (1998-04-01), Behtash et al.
patent: 5754542 (1998-05-01), Ault et al.
patent: 629097 (1904-06-01), None
patent: 701337 (1996-03-01), None
patent: 9519079 (1905-07-01), None

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