Wave-shaping for over- and undershoot prevention

A method for using a transmitter to transmit an amplitude modulated data signal in an RF-Field over the air to a receiver of an RFID communication system, comprising:

• processing an amplitude modulation of a carrier signal with a particular frequency and waveform with a data signal or encoded data signal to be transmitted;
• and
• selecting a waveform with higher or lower energy content of the carrier signal for one or several waves depending on the occurrence of a rising edge or falling edge in the data signal or encoded data signal to be transmitted, and
• wherein a lower energy content of the carrier signal for one or several waves at the occurrence of a rising edge in the data signal or encoded data signal is selected to reduce or avoid an overshoot in the envelope of the RF-Field or, wherein a higher energy content of the carrier signal for one or several waves at the occurrence of a falling edge in the data signal or encoded data signal is selected to reduce or avoid an undershoot in the envelope of the RF-Field.

A method for using a transmitter to transmit an amplitude modulated data signal in an RF-Field over the air to a receiver of an RFID communication system, comprising:

• processing an amplitude modulation of a carrier signal with a particular frequency and waveform with a data signal or encoded data signal to be transmitted;
• and
• selecting a waveform with higher or lower energy content of the carrier signal for one or several waves depending on the occurrence of a rising edge or falling edge in the data signal or encoded data signal to be transmitted, and
• wherein a higher energy content of the carrier signal for one or several waves at the occurrence of a rising edge in the data signal or encoded data signal is selected to reduce the time duration of the rising edge in the envelope of the RF-Field or, wherein a lower energy content of the carrier signal for one or several waves at the occurrence of a falling edge in the data signal or encoded data signal is selected to reduce the time duration of the falling edge in the envelope of the RF-Field.

A method for transmitting an amplitude modulated data signal in an RF-Field over the air to a receiver of an RFID communication system, comprising the steps of:

• generating a carrier signal with a particular frequency and waveform;
• modulating the carrier signal in relation to a data signal to be transmitted, thereby generating an amplitude modulated data signal;
• transmitting the amplitude modulated data signal in the RF-Field over the air;
• selecting the waveform of the carrier signal based on the data signal;
• and
• selecting in a first time frame (t3 →t4) after the rising edge of the data signal or encoded data signal during the rising edge of the envelope of the RF-Field a waveform of the carrier signal with the same frequency, but with lower energy content than outside of this first time frame (t3 >t4).