Transmitter, receiver and controlling method thereof

Patent metadata

Field	Value
Publication number	US-9571322-B2
Application number	US-201514588740-A
Country	US
Kind code	B2
Filing date	Jan 2, 2015
Priority date	Jan 3, 2014
Publication date	Feb 14, 2017
Grant date	Feb 14, 2017

Abstract

Provided are a transmitter, receiver and method of transmitting and receiving Orthogonal Frequency-Division Multiplexing (OFDM) symbols. The transmitter includes: a sub carrier grouping part configured to perform grouping of a plurality of sub carriers into a plurality of groups, and to change phases and/or amplitudes of the plurality of sub carriers by group; and a transmitting part configured to generate at least one OFDM symbol from the plurality of sub carriers of which the phases and/or the amplitudes have been randomly changed by group, and to transmit the OFDM symbol and information about the grouping.

First claim

What is claimed is:

1. A transmitter comprising:
at least one memory configured to store computer executable instructions; and
at least one processor configured to execute the computer executable instructions, the computer executable instructions controlling the at least one processor to perform:
a sub carrier grouping operation of grouping a plurality of sub carriers into a plurality of groups, and changing phases and/or amplitudes of the plurality of sub carriers by group so that the plurality of groups of sub carriers have different phases and/or amplitudes; and
a transmitting operation of generating at least one Orthogonal Frequency-Division Multiplexing (OFDM) symbol from the plurality of groups of sub carriers of which the phases and/or the amplitudes have been changed by group, and transmitting the OFDM symbol and information about the grouping,
wherein the grouping a plurality of sub carriers comprises grouping the plurality of sub carriers such that at least two groups of the plurality of groups of sub carriers have different numbers of sub carriers.

2. The transmitter according to claim 1 , wherein the grouping information comprises information on a number of sub carriers grouped into each of the plurality of groups.

3. The transmitter according to claim 1 , wherein the changing phases and/or amplitudes of the plurality of sub carriers comprises changing the phases of the plurality of the sub carriers in order to differentiate the plurality of groups and changing the amplitudes of the sub carriers of which the phases have been changed, by group.

4. The transmitter according to claim 1 , wherein the grouping a plurality of sub carriers comprises grouping the plurality of sub carriers such that at least one of a number of sub carriers in each of the plurality of groups and a number of the plurality of groups is determined considering a channel condition of a receiver of the OFDM symbol.

5. The transmitter according to claim 1 , wherein the grouping a plurality of sub carriers comprises grouping the plurality of sub carriers such that a number of sub carriers in a group of the plurality of groups for a mobile receiver of the OFDM symbol is greater than a number of sub carriers in a group of the plurality of groups for a fixed receiver of the OFDM symbol.

6. The transmitter according to claim 1 , wherein the changing phases and/or amplitudes of the plurality of sub carriers by group comprises changing both phases and amplitudes of the plurality of sub carriers by group.

7. A receiver comprising:
at least one memory comprising computer executable instructions; and
at least one processor configured to execute the computer executable instructions, the computer executable instructions controlling the at least one processor to perform:
a receiving operation of receiving at least one Orthogonal Frequency-Division Multiplexing (OFDM) symbol generated from a plurality of sub carriers which are grouped into a plurality of groups and of which phases and/or amplitudes have been changed by group so that the plurality of groups of sub carriers have different phases and/or amplitudes, and grouping information about the grouping;
a signal processing operation of converting the OFDM symbol into the plurality of sub carriers, and determining a number of sub carriers included in each of the plurality of groups based on the grouping information; and
a channel assuming operation of performing a channel assumption based on the number of the sub carriers included in each of the plurality of groups,
wherein the grouping a plurality of sub carriers comprises grouping the plurality of sub carriers such that at least two groups of the plurality of groups of sub carriers have different numbers of sub carriers.

8. The receiver according to claim 7 , wherein the grouping information comprises information on the number of the sub carriers included in each of the plurality of groups.

9. The receiver according to claim 7 , wherein the plurality of sub carriers are grouped such that at least one of a number of sub carriers in each of the plurality of groups and a number of the plurality of groups is determined considering a channel condition of the receiver of the OFDM symbol.

10. The receiver according to claim 7 , wherein the plurality of sub carriers are grouped such that a number of sub carriers in a group of the plurality of groups for a mobile receiver of the OFDM symbol is greater than a number of sub carriers in a group of the plurality of groups for a fixed receiver of the OFDM symbol.

11. A method of controlling a transmitter using at least one processor, the method comprising:
grouping a plurality of sub carriers into a plurality of groups, and changing phases and/or amplitudes of the plurality of sub carriers by group;
generating at least one Orthogonal Frequency-Division Multiplexing (OFDM) symbol, which is generated from the plurality of groups of sub carriers of which phases and amplitudes have been changed, per group, so that the plurality of groups of sub carriers have different phases and/or amplitudes; and
transmitting the generated OFDM symbol and grouping information,
wherein the grouping a plurality of sub carriers comprises grouping the plurality of sub carriers such that at least two groups of the plurality of groups of sub carriers have different numbers of sub carriers.

12. The method according to claim 11 , wherein the grouping information comprises information on a number of sub carriers grouped into each of the plurality of groups.

13. The method according to claim 11 , wherein the changing comprises changing the phases of the plurality of the sub carriers in order to differentiate the plurality of groups, and randomly changing the amplitudes of the sub carriers of which the phases have been changed, by group.

14. The method according to claim 11 , wherein the changing phases and/or amplitudes of the plurality of sub carriers by group comprises changing both phases and amplitudes of the plurality of sub carriers by group.

15. A method of controlling a receiver using at least one processor, the method comprising:
receiving at least one Orthogonal Frequency-Division Multiplexing (OFDM) symbol generated from a plurality of sub carriers which are grouped into a plurality of groups and of which phases and/or amplitudes have been changed by group so that the plurality of groups of sub carriers have different phases and/or amplitudes, and grouping information about the grouping;
converting the OFDM symbol into the plurality of sub carriers, and determining a number of sub carriers included in each of the plurality of groups based on the grouping information; and
performing a channel assumption based on the number of the sub carriers included in each of the plurality of groups,
wherein the grouping a plurality of sub carriers comprises grouping the plurality of sub carriers such that at least two groups of the plurality of groups of sub carriers have different numbers of sub carriers.

16. The method according to claim 15 , wherein the grouping information comprises information on the number of the sub carriers included in each of the plurality of groups.

17. The method according to claim 15 , wherein the plurality of sub carriers are grouped such that at least one of a number of sub carriers in each of the plurality of groups and a number of the plurality of groups is determined considering a channel condition of the receiver of the OFDM symbol.

18. The receiver according to claim 15 , wherein the plurality of sub carriers are grouped such that a numbe

Assignees

• Samsung Electronics Co Ltd

Inventors

• Bae Jae-Hyeon
• Oh Young-Ho
• Han Jae-Sung

Classifications

• H04L27/2649

  Demodulators · CPC title

• H04L27/2627 Primary

  Modulators · CPC title

• H04L27/2634 Primary

  Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation · CPC title

• H04L27/26524

  Fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators in combination with other circuits for demodulation · CPC title

• H04J11/0023 Primary

  Interference mitigation or co-ordination (direct sequence spread spectrum [DSSS] systems H04B1/7097; frequency hopping H04B1/713; allocation criteria for ingress interference avoidance H04L5/0062; frequency allocation criteria for requirements on out-of-channel emissions H04L5/0066; arrangements for removing intersymbol interference or baseband equalisers H04L25/03006; peak power aspects in multicarrier modulation H04L27/2614; power management H04W52/00; traffic scheduling H04W72/54, H04W72/541) · CPC title