Radio-frequency IC for a mobile radio transmitter
View Patent ↗A radio-frequency IC ( 3 ) for a mobile radio transmitter ( 1 ) has an analogue/digital converter unit ( 5 ) for digitizing baseband signals (AB), a recovery unit ( 6, 7, 8, 9, 10 ) for recovering determined data information (Rot, TxSymbPhase) on which the baseband signals (AB) are based, a digital/analogue converter unit ( 11 ) and a frequency converter unit for producing transmitted signals on the basis of the signals produced by the digital/analogue converter unit ( 11 ).
1. A Radio-frequency IC for a mobile radio transmitter, comprising
an input for receiving analogue baseband signals that are phase-modulated and particularly conform to the EDGE standard,
an analogue/digital converter unit for analogue/digital conversion of the analogue baseband signals,
a recovery unit, connected downstream of the analogue/digital converter unit, for recovering determined data information on which the analogue baseband signals are based, the recovery unit comprising:
a converter unit for representing the digital baseband signals using polar coordinates, and
a phase decision element which uses the phase signals obtained from the converter unit for the digital baseband signals to determine the phase rotations between two respective successive symbols from which the analogue baseband signals are produced or the succession of phase states from which the analogue baseband signals are produced, and
a unit for producing analogue transmitted signals using the determined data information.
2. A Radio-frequency IC according to claim 1 , wherein
the analogue baseband signals supplied to the input of the radio-frequency IC are in pulse-shaped form, and
the recovery unit has an equalizer for equalizing the digital baseband signals.
3. A Radio-frequency IC according to claim 2 , wherein the equalizer is in the form of a digital FIR filter.
4. A Radio-frequency IC according to claim 3 , wherein the filter coefficients of the FIR filter are tuned to the pulse shaping of the analogue baseband signals.
5. A Radio-frequency IC according to claim 1 , wherein the recovery unit comprises a demodulator for demodulating the digital baseband signals, the demodulator being connected downstream of the equalizer, in particular.
6. A Radio-frequency IC according to claim 1 , wherein a modulator is connected into the transmitted signal path of the radio-frequency IC, the modulator being arranged in the transmitted signal path downstream of the recovery unit.
7. A Radio-frequency IC according to claim 6 , wherein a pulse-shaping filter is connected into the transmitted signal path of the radio-frequency IC, the pulse-shaping filter being arranged in the transmitted signal path downstream of the recovery unit or downstream of the modulator.
8. A Radio-frequency IC according to claim 1 , wherein the recovery unit comprises a synchronization unit which uses the absolute-value signals obtained from the converter unit to control the phase decision element.
9. A Radio-frequency IC according to claim 8 , wherein the synchronization unit controls the phase decision element by supplying it with a symbol clock which indicates to the phase decision element the time at which a phase signal which can be used for further evaluation is present.
10. A Mobile radio transmitter having a baseband IC and a radio-frequency IC according to claim 1 , wherein the baseband IC produces the analogue baseband signals which the radio-frequency IC receives at its input.
11. A Radio-frequency IC for a mobile radio transmitter, comprising
an input receiving analogue baseband signals that are in pulse-shaped form,
an analogue/digital converter unit coupled with said input,
a recovery unit connected downstream of the analogue/digital converter unit, the recovery unit comprising:
an equalizer for equalizing the digital baseband signals,
a converter unit coupled with said equalizer for representing the digital baseband signals using polar coordinates, and
a phase decision element which uses the phase signals obtained from the converter unit for the digital baseband signals to determine the phase rotations between two respective successive symbols from which the analogue baseband signals have been produced or the succession of phase states from which the analogue baseband signals have been produced, and
a unit coupled to said recovery unit operable to produce analogue transmitted signals.
12. A Radio-frequency IC according to claim 11 , wherein
the equalizer is in the form of a digital FIR filter, and
the filter coefficients of the FIR filter are tuned to the pulse shaping of the analogue baseband signals.
13. A Radio-frequency IC according to claim 11 , wherein a modulator is connected into the transmitted signal path of the radio-frequency IC, the modulator being arranged in the transmitted signal path downstream of the recovery unit.
14. A Radio-frequency IC according to claim 13 , wherein a pulse-shaping filter is connected into the transmitted signal path of the radio-frequency IC, the pulse-shaping filter being arranged in the transmitted signal path downstream of the recovery unit or downstream of the modulator.
15. A Radio-frequency IC according to claim 11 , wherein the analogue baseband signals supplied to the input of the radio-frequency IC are phase-modulated and particularly conform to the EDGE standard.