Transmitting and receiving unit
First Claim
1. A transmitting and receiving unit, comprising:
- first and second frequency generators;
a switch;
a receiving branch with an in-phase component and a quadrature component, said receiving branch having a first frequency converter coupled to said first frequency generator;
a transmitting branch with an in-phase component and a quadrature component, said transmitting branch having a second frequency converter switchably coupled to one of said first and second frequency generators through said switch; and
a control device coupled to said switch for selecting a transmitting mode of operation and a receiving mode of operation.
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Accused Products
Abstract
A transmitting and receiving unit includes a receiving branch and a transmitting branch that are in each case constructed for conducting complex signals, with a control device that drives a switch by which either a phase-locked loop is switched through to frequency converters provided at the transmitting and receiving end, for providing a common carrier frequency, or in each case an independently operating PLL is provided for the transmitting and receiving branch. Such a configuration enables the transmitter, for example, to operate with direct conversion whereas the receiver can operate, for example, on the low IF principle. The invention is suitable for OFDM multi-carrier systems.
74 Citations
17 Claims
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1. A transmitting and receiving unit, comprising:
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first and second frequency generators;
a switch;
a receiving branch with an in-phase component and a quadrature component, said receiving branch having a first frequency converter coupled to said first frequency generator;
a transmitting branch with an in-phase component and a quadrature component, said transmitting branch having a second frequency converter switchably coupled to one of said first and second frequency generators through said switch; and
a control device coupled to said switch for selecting a transmitting mode of operation and a receiving mode of operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A transmitting and receiving unit, comprising:
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first and second frequency generators;
a switch;
a receiving branch with an in-phase component and a quadrature component, said receiving branch having a first frequency converter coupled to said first frequency generator;
a transmitting branch with an in-phase component and a quadrature component, said transmitting branch having a second frequency converter switchably coupled to one of said first and second frequency generators through said switch; and
a control device coupled to said switch and being programmed to select at least one of a transmitting mode of operation and a receiving mode of operation.
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Specification