Device and method for spectrally shaping a transmission signal in a radio transmitter
AssigneeInfineon Technologies AG
InventorsMarkus Dötsch, Peter Jung, Jörg Plechinger, Peter Schmidt, Michael Schneider, Tideya Kella
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Abstract
A device for spectrally shaping a discrete-value transmission signal, in a radio transmitter, includes one input for receiving an in phase component of the transmission signal and a further input for receiving a quadrature component of the transmission signal. The device also includes a filter circuit with a plurality of multipliers. A multiplexing unit is located in the signal path before the filter circuit, and a demultiplexing unit is located in the signal path after the filter circuit.
Claims13
A device for spectrally shaping a discrete-value transmission signal in a radio transmitter, comprising:
- a first input for receiving an in-phase component of the transmission signal;
- a second input for receiving a quadrature component of the transmission signal;
- a first shift register having N first memory locations, said first shift register connected to said first input;
- a second shift register having N second memory locations, said second shift register connected to said second input;
- a multiplexer unit having a plurality of multiplexers;
- a discrete-value filter circuit having a plurality of multipliers and at least one adder for spectrally shaping both the in-phase component and the quadrature component of the transmission signal, said multipliers being used, in a multiplex method, both for the in-phase component and for the quadrature component of the transmission signal;
- a first output for providing a filtered in-phase component of the transmission signal;
- a second output for providing a filtered quadrature component of the transmission signal;
- a demultiplexer unit;
- and
- a signal path;
- each of said memory locations of said first shift register having M signal taps, and each of said memory locations of said second shift register having M signal taps, M being greater than one;
- said multiplexer unit configured in the signal path downstream from said first shift register and said second shift register;
- said multiplexer unit configured in the signal path upstream of said filter circuit;
- and
- said demultiplexer unit configured in the signal path downstream of said filter circuit and upstream of said first output and said second output.
A method for spectrally shaping a discrete-value transmission signal in a radio transmitter, which comprises:
- providing an in-phase component of the transmission signal at a first input that is connected to a first shift register having N first memory locations;
- providing a quadrature component of the transmission signal at a second input that is connected to a second shift register having N second memory locations;
- filtering the in-phase component of the transmission signal and the quadrature component of the transmission signal in a discrete-value filter circuit having a plurality of multipliers and at least one adder;
- for spectrally shaping both the in-phase component and the quadrature component of the transmission signal, using the multipliers in a multiplex method, both for the in-phase component and for the quadrature component of the transmission signal;
- in a signal path upstream of the filtering, multiplexing the in-phase component of the transmission signal and the quadrature component of the transmission signal;
- at each one of the N first memory locations, providing an output signal at a plurality of taps;
- at each one of the N second memory locations, providing an output signal at a plurality of taps;
- and
- demultiplexing the in-phase component of the transmission signal and the quadrature component of the transmission signal in a signal path downstream of the filtering.
Dependencies are inferred from the claim text.