Methods and Devices for Transmission of Signals in a Telecommunication System

1. A method of generating a training sequence in a radio communication network for a user sharing a transmission slot with other users, where multiple users are multiplexed in the time slot, the method comprising, in a transmitter device: repeating one or more times a first, original, bit sequence; and adding a cyclic prefix and a cyclic postfix to the repeated bit sequence, thereby forming the training sequence for the user, wherein the bits in some sub-blocks of the repeated bit sequence are bit flipped, wherein the flipped bits are user specific.

2. The method of claim 1 , wherein the repeated bit sequence is repeated a number of times corresponding to a number of users in the time slot.

3. The method of claim 1 , wherein the sub-blocks correspond to the original bit sequence.

4. The method of claim 1 , further comprising formatting a burst to be transmitted by adding other bits in a predetermined order to the training sequence for the user.

5. The method of claim 4 , wherein said other bits comprise one or many of tail bits, guard bits, and user specific payload bits.

6. The method of claim 5 , wherein the burst is formatted by adding GSM (Global System for Mobile Communication) guard bits at the beginning, followed by tail bits, followed by a first half of the payload, then training sequence bits for the user are added, followed by a second half of the payload bits followed by more tail bits and guard bits.

7. The method of claim 4 , further comprising feeding the burst to a modulator.

8. The method of claim 7 , wherein the modulator is a Continuous Phase Modulator (CPM) modulator.

9. The method of claim 8 , wherein the modulator is a GMSK modulator.

10. The method of claim 7 , further comprising rotating an output signal from the modulator with a user specific rotation angle.

11. A method of blind detection of a received GSM radio signal, the method comprising: determining whether the received GSM radio signal includes a training sequence for user sharing a transmission slot with other users, wherein a positive result for the determination occurs only when the controller circuitry detects a cyclic prefix and a cyclic postfix of a repeated bit sequence within the received GSM radio signal, wherein in the repeated bit sequence bits in some sub-blocks of the repeated bit sequence are bit flipped, wherein the flipped bits are user specific; and detecting the received GSM radio signal as a single layer EGPRS/EGPRS2 when the determination does not yield the positive result and to detect the received GSM radio signal as a multilayer (MIMO/MU-MIMO) signal when the determination yields the positive result.

12. A device for generating a training sequence in a radio communication network for a user sharing a transmission slot with other users, where multiple users are multiplexed in the time slot, the device comprising controller circuitry configured to: repeat one or more times a first, original, bit sequence, and a cyclic prefix and a cyclic postfix to the repeated bit sequence, thereby forming the training sequence for the user, wherein the controller circuitry is adapted to bit flip the bits in some sub-blocks of the repeated bit sequence, wherein the flipped bits are user specific.

13. The device of claim 12 , wherein the controller circuitry is adapted to repeat the repeated bit sequence a number of times corresponding to a number of users in the time slot.

14. The device of claim 12 , wherein the sub-blocks correspond to the original bit sequence.

15. The device of claim 12 , wherein the controller circuitry is adapted to format a burst to be transmitted by adding other bits in a predetermined order to the training sequence for the user.

16. The device of claim 15 , wherein said other bits comprise one or many of tail bits, guard bits, and user specific payload bits.

17. The device of claim 16 , wherein the controller circuitry is adapted to format the burst by adding GSM (Global System for Mobile Communication) guard bits at the beginning, followed by tail bits, followed by a first half of the payload, then training sequence bits for the user are added, followed by a second half of the payload bits followed by more tail bits and guard bits.

18. The device of claim 15 , further comprising a modulator adapted to receive the formatted burst.

19. The device of claim 18 , wherein the modulator is a Continuous Phase Modulator (CPM) modulator.

20. The device of claim 19 , wherein the modulator is a GMSK modulator.

21. The device of claim 18 , further comprising a rotator for rotating an output signal from the modulator with a user specific rotation angle.

22. A device for blind detection of a received GSM radio signal, the device comprising: controller circuitry adapted to determine whether the received GSM radio signal includes a training sequence for user sharing a transmission slot with other users, wherein a positive result for the determination occurs only when the controller circuitry detects a cyclic prefix and a cyclic postfix of a repeated bit sequence within the received GSM radio signal, wherein in the repeated bit sequence bits in some sub-blocks of the repeated bit sequence are bit flipped, wherein the flipped bits are user specific; and controller circuitry adapted to detect the received GSM radio signal as a single layer EGPRS/EGPRS2 when the determination does not yield the positive result and to detect the received GSM radio signal as a multilayer (MIMO/MU-MIMO) signal when the determination yields the positive result.