Antenna hopping sequence for TX diversity in wireless telecommunication systems
View Patent ↗The invention proposes for improving the overall spectral efficiency of wireless telecommunication systems, in particular of mobile communication systems, the transmission of at least one multiframe signal having a plurality of sub-frames with predefined logical channels (BCCH, FCCH, SCH) repeatedly embedded in predefined sub-frames, wherein a transmitter diversity is applied using antenna and/or polarization hopping sequences such that during the transmission of respective one multiframe, each logical channel (BCCH, FCCH, SCH) is transmitted at least two times with a different antenna and/or polarization.
1. A method for transmission having improved overall spectral efficiency in a wireless telecommunication system, comprising—transmitting at least one multiframe signal having a plurality of sub-frames, wherein:
three or more predefined logical channels including a frequency correction channel FCCH and a synchronization channel SCH are repeatedly embedded in predefined sub-frames;
the step of transmitting comprises—applying transmitting diversity using at least one of antenna hopping sequences and polarisation hopping sequences, such that during the transmission of at least one said multiframe signal, each logical channel is transmitted at least twice on different antennas and/or with different polarisations;
if antenna hopping sequences are used, at least one antenna hopping sequence is applied such that each time an antenna is selected for FCCH the same antenna is selected for SCH; and
if polarisation hopping sequences are used, at least one polarisation hopping sequence is applied such that each time a polarisation is selected for FCCH the same polarisation is selected for SCH.
2. Method of claim 1 , wherein at least one of said logical channels (FCCH, SCH) is organised in blocks of a single burst.
3. Method of claim 1 , wherein a definable number of logical channels (BCCH, FCCH, SCH) repeatedly embedded in predefined sub-frames comprises frequency correction and/or synchronisation data.
4. Method of claim 1 , wherein a non-cyclic hopping sequence is applied.
5. Method of claim 1 , wherein respective two successive sub-frames are transmitted with the same antenna and/or polarisation.
6. Method of claim 1 , wherein at least two antennas and/or polarisation are provided for the step of transmitting.
7. Method of claim 1 , wherein the hopping sequence is performed through a combination of baseband and synthesiser hopping.
8. Method of claim 1 , wherein a least one 51-multiframe signal is transmitted.
9. Transceiver devices adapted to transmit at least one multiframe signal having a plurality of sub-frames with three or more predefined logical channels including a frequency correction channel FCCH and a synchronization channel SCH repeatedly embedded in predefined sub-frames, wherein the step of transmitting is performed by applying transmitting diversity using at least one of antenna hopping sequences and polarisation hopping sequences, such that during the transmission of at least one said multiframe signal, each logical channel is transmitted at least twice on different antennas and/or with different polarisations;
if antenna hopping sequences are used, at least one antenna hopping sequence is applied such that each time an antenna is selected for FCCH the same antenna is selected for SCH; and
if polarisation hopping sequences are used, at least one polarisation hopping sequence is applied such that each time a polarisation is selected for FCCH the same polarisation is selected for SCH.