Method and apparatus for supporting multiple-access signal in mobile communication system

Patent metadata

Field	Value
Publication number	US-9379922-B2
Application number	US-201314076051-A
Country	US
Kind code	B2
Filing date	Nov 8, 2013
Priority date	Nov 9, 2012
Publication date	Jun 28, 2016
Grant date	Jun 28, 2016

Abstract

In order to generate multiple-access signals, each transmitter transmits information by using all or a part of channel resources. The signal of each transmitter is mapped to an OFDM time-frequency resource space as a trellis modulation path. A mobile communication system maps trellis modulation paths of a plurality of transmitters to the same resource space. In order to effectively detect and distinguish signals of a plurality of transmitters transmitted through the same channel resource space, a receiver uses a message passing method between symbols and a path connection method. The receiver uses a state space expansion method, a backward pre-decoding method, and a successive interference cancellation method to more efficiently reconstruct a discovery signal.

First claim

What is claimed is:

1. A method of transmitting a multiple-access signal by a transmitter in a mobile communication system, the method comprising:
selecting a transmission resource based on a trellis map, wherein the trellis map indicates information associated with a position changing of at least one tone;
determining the multiple-access signal, wherein the multiple-access signal is mapped to one resource slot; and
transmitting the multiple-access signal as a function of the selected transmission resource to a receiver,
wherein the multiple-access signal transmission is overlapped at two or more transmitters in a time axis.

2. The method of claim 1 , wherein the transmission resource include a resource slot and the multiple-access signal associated with one or more transmitters that are mapped to the one resource slot.

3. The method of claim 1 , wherein the trellis map includes position information of an initial tone.

4. The method of claim 3 , wherein the position information of the initial tone is determined a predetermined bit information.

5. The method of claim 3 , wherein the trellis map includes at least one of a predetermined trellis map, a trellis map stored in a memory, or a trellis map provided to the transmitter.

6. An apparatus for transmitting a multiple-access signal by a transmitter in a mobile communication system, the apparatus comprising:
a controller configured to:
select a transmission resource based on a trellis map, wherein the trellis map indicates

information associated with a position changing of at least one tone; and
determine the multiple-access signal, wherein the multiple-access signal is mapped to one resource slot;

a transmitter configured to transmit the multiple-access signal in accordance with the selected transmission resource to a receiver,
wherein the multiple-access signal transmission is overlapped at two or more transmitters in a time axis.

7. The apparatus of claim 6 , wherein the transmission resource includes a resource slot and the multiple-access signal associated with one or more transmitters that are mapped to the one resource slot.

8. The apparatus of claim 6 , wherein the trellis map includes position information of an initial tone.

9. The apparatus of claim 8 , wherein the position information of the initial tone is determined by a predetermined bit information.

10. The apparatus of claim 8 , wherein the trellis map includes at least one of a predetermined trellis map, a trellis map stored in a memory, or a trellis map given to the transmitter.

11. A method of receiving a multiple-access signal in a mobile communication system, the method comprising:
receiving the multiple-access signal transmitted from a transmitter, wherein the multiple-access signal is overlapped at two or more transmitters in a time axis;
demodulating the multiple-access signal transmitted from the transmitter;
reconstructing the multiple-access signal based on a trellis map, wherein the trellis map indicates information associated with a position changing of at least one tone; and
selecting the reconstructed multiple-access signal in accordance with a transmission resource.

12. The method of claim 11 , wherein the transmission resource includes a resource slot and the multiple-access signal associated with one or more transmitters that are mapped to the one resource slot.

13. The method of claim 11 , wherein the trellis map includes position information of an initial tone.

14. The method of claim 13 , wherein the position information of the initial tone is determined by predetermined bit information.

15. The method of claim 13 , wherein the trellis map includes at least one of a predetermined trellis map, a trellis map stored in using a memory, or a trellis map provided to the transmitter.

16. The method of claim 11 , wherein the reconstructing the multiple-access signal based on a trellis map comprises:
detecting a state transition pattern associated with the multiple-access signal transmitted from the transmitter in accordance with a message passing scheme in a unit of a symbol; and
obtaining the multiple-access signal in accordance with the state transition pattern.

17. The method of claim 16 , further comprises:
connecting one or more paths of the state transition pattern in accordance with the message passing scheme in the unit of the symbol;
converting the one or more paths to bitstreams; and
determining information in accordance with a cyclic redundancy check (CRC) inspection on each of the bitstreams.

18. The method of claim 11 , further comprises:
expanding a state space of the trellis map in accordance with separating overlapped symbols.

19. The method of claim 16 , further comprises: expanding a state space of the trellis map beforehand in accordance with a backward pre-decoding scheme.

20. An apparatus for receiving a multiple-access signal in a mobile communication system, the apparatus comprising:
a receiver configured to receive the multiple-access signal transmitted from a transmitter, wherein the multiple-access signal is overlapped at two or more transmitters in a time axis;
a demodulator configured to demodulate the multiple-access signal transmitted from the transmitter: and
a controller configured to:
reconstruct the multiple-access signal based on a trellis map, wherein the trellis map indicates information associated with a position changing of at least one tone; and
select the reconstructed multiple-access signal in accordance with a transmission resource.

21. The apparatus of claim 20 , wherein the transmission resource includes a resource slot and the multiple-access signal associated with one or more transmitters that are mapped to the one resource slot.

22. The apparatus of claim 20 , wherein the trellis map includes position information of an initial tone.

23. The apparatus of claim 22 , wherein the position information of the initial tone is determined by predetermined bit information.

24. The apparatus of claim 20 , wherein the trellis map includes at least one of a predetermined trellis map, a trellis map stored in using a memory, or a trellis map given to the transmitter.

25. The apparatus of claim 20 , wherein the controller is further configured to detect a state transition pattern associated with the multiple-access signal transmitted from the transmitter in accordance with a message passing scheme in a unit of a symbol, and obtain the multiple-access signal in accordance with the state transition pattern.

26. The apparatus of claim 20 , wherein the controller is further configured to connect one or more paths of the state transition pattern in accordance with the message passing scheme in the unit of the symbol convert the one or more paths to bitstreams, and determine information in accordance with a cyclic redundancy check (CRC) inspection on each of the bitstreams.

27. The apparatus of claim 20 , wherein the controller is configured to expand a state space of the trellis map in accordance with separating overlapped symbols.

28. The apparatus of claim 20 , wherein the controller is further configured to expand a state space of the trellis map beforehand in accordance with a backward pre-decoding scheme.

29. The method of claim 1 , wherein the at least one tone is an orthogonal frequency division multiplexing (OFDM) tone.

Assignees

• Samsung Electronics Co Ltd
• Univ Sungkyunkwan Res & Bus
• Samsung Electronics Co Ltd

Inventors

• Lim Chi-Woo
• Kim Sang-Hyo
• Jang Min
• Kang Jin-Hwan
• Kim Kyung-Kyu
• Kim Dae-Gyun
• Ryu Hyun-Seok
• Park Seung-Hoon
• Shin Seung-Sik

Classifications

• H04L25/03203 Primary

  Trellis search techniques · CPC title

• H04L25/0328

  with interference cancellation circuitry (adaptations for interference cancellation within a sequence estimator H04L25/03305; interference related aspects of direct sequence spread spectrum H04B1/7097; interference related aspects of frequency hopping spread spectrum H04B1/715; see also H04B1/10) · CPC title

• H04L5/0007

  the frequencies being orthogonal, e.g. OFDM(A) or DMT · CPC title

• H04L27/26 Primary

  Systems using multi-frequency codes (H04L27/32 takes precedence) · CPC title