ENHANCED COMMUNICATION PERFORMANCE UNDER VOICE SERVICES OVER ADAPTIVE MULTI-USER CHANNELS ON ONE SLOT (VAMOS) PAIRING

• US 20170054585A1
• Filed: 08/17/2015
• Published: 02/23/2017
• Est. Priority Date: 08/17/2015
• Status: Abandoned Application

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Altan, Cetin, Rafique, Hassan, Sikri, Divaydeep, Yu, Zhi-Zhong
• Application Number:
  US14/827,511
• Publication Number:
  US 20170054585A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 27/261 Details of reference signals
• CPC Class Codes: H04L 27/2649 Demodulators
• CPC Class Codes: H04L 5/12 the signals being represented by different phase modulations of a single carrier

Abstract

Enhancing mobile communication performance under Voice services over Adaptive Multi-user channels on One Slot (VAMOS) pairing with receiving a multiplexed signal, wherein the multiplexed signal includes a first user signal having a first amplitude and a second user signal having a second amplitude, computing a subchannel power imbalance ratio (SCPIR) based on the first amplitude of the first user signal and the second amplitude of the second user signal, performing a channel estimation for the first user signal and the second user signal, obtaining at least one channel parameter from the channel estimation, and performing a user signal demodulation for the first user signal or the second user signal using the at least one channel parameter.

Claims

1. A method of wireless communication, comprising:

receiving a multiplexed signal, wherein the multiplexed signal includes a first user signal having a first amplitude and a second user signal having a second amplitude;

computing a subchannel power imbalance ratio (SCPIR) based on the first amplitude of the first user signal and the second amplitude of the second user signal;

performing a channel estimation for the first user signal and the second user signal;

obtaining at least one channel parameter from the channel estimation; and

performing a user signal demodulation for the first user signal or the second user signal using the at least one channel parameter.

2. The method of claim 1, further comprising comparing the SCPIR to a SCPIR threshold.

3. The method of claim 2, wherein the SCPIR is greater than the SCPIR threshold.

4. The method of claim 3, further comprising determining that interference from the second user signal to the first user signal is a benign interference scenario when the interference is less than a predefined performance level.

5. The method of claim 4, further comprising performing the channel estimation by using a first training sequence code (TSC_1st) for the first user signal and a second training sequence code (TSC_2nd) for the second user signal.

6. The method of claim 5, wherein the first training sequence code (TSC_1st) and the second training sequence code (TSC_2nd) are distinct digital training sequence codes.

7. The method of claim 6, wherein the first training sequence code (TSC_1st) and the second training sequence code (TSC_2nd) include a low cross-correlation characteristic.

8. The method of claim 2, wherein the SCPIR is less than or equal to the SCPIR threshold.

9. The method of claim 8, further comprising determining that interference from the second user signal to the first user signal is a harsh SCPIR scenario when the interference is greater than or equal to a predefined performance level.

10. The method of claim 9, further comprising performing the channel estimation by using a second training sequence code (TSC_2nd) for the first user signal and the second user signal, wherein the second training sequence code (TSC_2nd) is associated with the second user signal.

11. The method of claim 10, wherein the second training sequence code (TSC_2nd) is a deterministic digital sequence including a series of binary values.

12. The method of claim 1, wherein the multiplexed signal includes at least two orthogonal signal components.

13. The method of claim 1, wherein the at least two orthogonal signal components include an in-phase component and a quadrature component.

14. The method of claim 1, wherein the SCPIR is computed as twenty (20) times a logarithm of a ratio of the first amplitude over the second amplitude.

15. The method of claim 1, wherein the at least one channel parameter is one of a timing estimate or a frequency estimate.

16. The method of claim 1, further comprising subtracting the second user signal from the multiplexed signal to obtain a suppressed multiplexed signal.

17. The method of claim 16, further comprising performing the user signal demodulation for the first user signal or the second user signal based on the suppressed multiplexed signal.

18. An apparatus for wireless communication, comprising:

a memory;

an antenna for receiving a multiplexed signal, wherein the multiplexed signal includes a first user signal having a first amplitude and a second user signal having a second amplitude;

a controller coupled to the memory for computing a subchannel power imbalance ratio (SCPIR) based on the first amplitude of the first user signal and the second amplitude of the second user signal; and

a receiver coupled to the controller and the antenna for the following;

performing a channel estimation for the first user signal and the second user signal;

obtaining at least one channel parameter from the channel estimation; and

performing a user signal demodulation for the first user signal or the second user signal using the at least one channel parameter.

19. The apparatus of claim 18, wherein the controller is configured for comparing the SCPIR to a SCPIR threshold.

20. The apparatus of claim 19, wherein the SCPIR is greater than the SCPIR threshold;

and

wherein the controller is configured for determining that interference from the second user signal to the first user signal is a benign interference scenario when the interference is less than a predefined performance level.

21. The apparatus of claim 20, wherein the receiver is configured for performing the channel estimation by using a first training sequence code (TSC_1st) for the first user signal and a second training sequence code (TSC_2nd) for the second user signal, and the first training sequence code (TSC_1st) and the second training sequence code (TSC_2nd) are distinct digital training sequence codes.

22. The apparatus of claim 19, wherein the SCPIR is less than or equal to the SCPIR threshold;

wherein the controller is configured for determining that interference from the second user signal to the first user signal is a harsh SCPIR scenario when the interference is greater than or equal to a predefined performance level; and

wherein the receiver is configured for performing the channel estimation by using a second training sequence code (TSC_2nd) for the first user signal and the second user signal, and the second training sequence code (TSC_2nd) is associated with the second user signal.

23. The apparatus of claim 18, wherein the receiver is configured for subtracting the second user signal from the multiplexed signal to obtain a suppressed multiplexed signal and configured for performing the user signal demodulation for the first user signal or the second user signal based on the suppressed multiplexed signal.

24. An apparatus for wireless communication, comprising:

a memory;

means for receiving a multiplexed signal, wherein the multiplexed signal includes a first user signal having a first amplitude and a second user signal having a second amplitude;

means for computing a subchannel power imbalance ratio (SCPIR) based on the first amplitude of the first user signal and the second amplitude of the second user signal;

means for performing a channel estimation for the first user signal and the second user signal;

means for obtaining at least one channel parameter from the channel estimation; and

means for performing a user signal demodulation for the first user signal or the second user signal using the at least one channel parameter.

25. The apparatus of claim 24, further comprising means for comparing the SCPIR to a SCPIR threshold.

26. The apparatus of claim 25, wherein the SCPIR is greater than the SCPIR threshold;

and

further comprising means for determining that interference from the second user signal to the first user signal is a benign interference scenario when the interference is less than a predefined performance level.

27. The apparatus of claim 26, further comprising means for performing the channel estimation by using a first training sequence code (TSC_1st) for the first user signal and a second training sequence code (TSC_2nd) for the second user signal;

wherein the first training sequence code (TSC_1st) and the second training sequence code (TSC_2nd) are distinct digital training sequence codes.

28. The apparatus of claim 25, wherein the SCPIR is less than or equal to the SCPIR threshold;

and

further comprising;

means for determining that interference from the second user signal to the first user signal is a harsh SCPIR scenario when the interference is greater than or equal to a predefined performance level; and

means for performing the channel estimation by using a second training sequence code (TSC_2nd) for the first user signal and the second user signal, wherein the second training sequence code (TSC_2nd) is associated with the second user signal.

29. The apparatus of claim 24, further comprising:

means for subtracting the second user signal from the multiplexed signal to obtain a suppressed multiplexed signal; and

means for performing the user signal demodulation for the first user signal or the second user signal based on the suppressed multiplexed signal.

30. A computer-readable storage medium storing computer executable code, operable on a device comprising at least one processor;

a memory for storing a subchannel power imbalance ratio (SCPIR) threshold, the memory coupled to the at least one processor; and

the computer executable code comprising;

instructions for causing the at least one processor to receive a multiplexed signal, wherein the multiplexed signal includes a first user signal having a first amplitude and a second user signal having a second amplitude;

instructions for causing the at least one processor to compute a subchannel power imbalance ratio (SCPIR) based on the first amplitude of the first user signal and the second amplitude of the second user signal;

instructions for causing the at least one processor to compare the SCPIR to the SCPIR threshold to generate a comparison;

instructions for causing the at least one processor to perform a channel estimation for the first user signal and the second user signal based on the comparison;

instructions for causing the at least one processor to obtain at least one channel parameter from the channel estimation; and

instructions for causing the at least one processor to perform a user signal demodulation for the first user signal or the second user signal using the at least one channel parameter.