Apparatus and method for correcting sudden phase changes in received signals in mobile stations
To correct sudden phase changes, a device for phase correction ( 20 ) and a common control unit ( 10 ) are described, the latter switching the gain factor for the amplifier stage ( 30 ) and, at times coordinated with this, delivering phase correction values of suitable size to the device for phase correction ( 20 ), where the control unit ( 10 ) uses knowledge about fixed parameters, such as delay times and properties of sudden phase changes, when changing over the amplifier stages.
1 . An apparatus for correcting sudden phase changes in received signals in mobile stations, wherein
the mobile station's reception path comprises switchable components having at least two switchable states which produce sudden phase changes in the received signal upon changeover,
these sudden phase changes being able to be corrected by a device for phase correction, and
a system control unit transmits the parameters required for this, particularly the level of the sudden phase change and the time of the sudden phase change, to the device for phase correction.
2 . The apparatus as claimed in claim 1 , wherein
the system control unit is designed such that it changes over the switchable components, particularly the gain factor for the amplifier stage, and that it uses this property to determine the time of the sudden phase change.
3 . The apparatus as claimed in claim 1 , wherein
the unit for phase correction simultaneously performs both correction of sudden phase changes and frequency correction.
4 . The apparatus as claimed in claim 1 , wherein
the unit for phase correction contains a structure which is based on the principle of the CORDIC algorithm.
5 . The apparatus as claimed in claim 1 , wherein
the unit for phase correction contains a structure which specifically implements phase corrections of 0°, 90° and −90° or else 180° without a multiplier.
6 . The apparatus as claimed in claim 5 , wherein
precisely one multiplexer is provided for processing the normal and quadrature components using time-division multiplexing.
7 . The apparatus as claimed in claim 5 , wherein
the unit for phase correction by 0°, 90°, −90° or 180° is combined with a unit for frequency correction which is based on the principle of the CORDIC algorithm.
8 . The apparatus as claimed in claim 5 , wherein
the unit for phase correction by 0°, 90°, −90° or 180° is implemented using means for analog signal processing and, in particular, is integrated on the chip which contains the switchable analog components.
9 . The apparatus as claimed in claim 1 , wherein
the apparatus is integrated in the same chip as the digital signal receiver.
10 . A mobile station having an apparatus for correcting sudden phase changes in received signals in mobile stations, wherein the mobile station's reception path comprises switchable components having at least two switchable states which produce sudden phase changes in the received signal upon changeover, wherein these sudden phase changes being able to be corrected by a device for phase correction, and wherein a system control unit transmits the parameters required for this, particularly the level of the sudden phase change and the time of the sudden phase change, to the device for phase correction, wherein the apparatus supports, in particular, the standards UMTS FDD, UMTS TDD, GSM (GMSK modulation), EDGE (3π/8-8 PSK modulation) and also TIA/EIA-136 (π/4-DQPSK modulation or 8-PSK modulation) or part combinations thereof.
11 . A method for correcting sudden phase changes in received signals in mobile stations, comprising the steps of:
producing in the mobile station's reception path sudden phase changes in the received signal when switchable components having at least two switchable states change over, and
correcting the sudden phase changes by a device for phase correction, and transmitting the parameters required for this by a system control unit, particularly the level of the sudden phase change and the time of the sudden phase change, to the device for phase correction.
12 . The method as claimed in claim 11 , wherein
the system control unit also changes over the switchable components, particularly the gain factor for the amplifier stage, and, in particular, uses this property to determine the time of the sudden phase change.
13 . The method as claimed in claim 11 , wherein
the unit for phase correction simultaneously performs both correction of sudden phase changes and frequency correction.
14 . The method as claimed in claim 11 , wherein
the unit for phase correction contains a structure which is based on the principle of the CORDIC algorithm.
15 . The method as claimed in claim 11 , wherein
the unit for phase correction contains a structure which specifically implements phase corrections of 0°, 90° and −90° or else 180° without a multiplier.
16 . The method as claimed in claim 15 , wherein
the normal and quadrature components are processed using time-division multiplexing, and only one multiplexer is used.
17 . The method as claimed in claim 15 , wherein
the unit for phase correction by 0°, 90°, −90° or 180° is combined with a unit for frequency correction which is based on the principle of the CORDIC algorithm.
18 . The method as claimed in claim 15 , wherein
the unit for phase correction by 0°, 90°, −90° or 180° is implemented using means for analog signal processing and, in particular, is integrated on the chip which contains the switchable analog components.
19 . The method as claimed in claim 11 , wherein
the arrangement or the method is integrated in the same chip as the digital signal receiver.
20 . The method as claimed in claim 11 , wherein
the method is used in mobile stations which support, in particular, the standards UMTS FDD, UMTS TDD, GSM (GMSK modulation), EDGE (3π/8-8 PSK modulation) and also TIA/EIA-136 (π/4-DQPSK modulation or 8-PSK modulation) or part combinations thereof.