Method for determining reserved tones and transmitter for performing PAPR reduction using tone reservation

Patent metadata

Field	Value
Publication number	US-11115254-B2
Application number	US-202016996191-A
Country	US
Kind code	B2
Filing date	Aug 18, 2020
Priority date	Jun 9, 2015
Publication date	Sep 7, 2021
Grant date	Sep 7, 2021

Abstract

A method of determining reserved tones for reduction of a peak to average power ratio (PAPR) includes: selecting carrier indices for the reserved tones and generating a kernel signal based on the selected carrier indices; calculating a comparison reference average value of the kernel signal, selecting one of the calculated comparison reference average value and a prestored comparison reference average value, and preliminarily determining carrier indices of the reserved tones based on the selection; re-arranging an order of the preliminarily determined carrier indices; calculating a comparison reference average value of a kernel signal generated, whenever each of the re-arranged carrier indices is changed to another carrier index, to generate a plurality of comparison reference average values, and finally determining carrier indices of the reserved tones which generates a kernel signal having the smallest comparison reference average value among the comparison reference average values as the indices of the reserved tones.

First claim

What is claimed is:

1. A receiving apparatus comprising:
a processor configured to process a frame received from a transmitting apparatus based on positions of reserved tones of an orthogonal frequency division multiplexing (OFDM) symbol for a peak to average power ratio (PAPR) reduction,
wherein a fast fourier transform (FFT) size of the OFDM symbol is 16K, and
wherein the positions of reserved tones are represented by a set of carriers having carrier indices listed below:

FFT Size

(Number of

Reserved

Tones)
Carrier Indices

16K (144)
421, 548, 589, 621, 644, 727, 770, 813,

857, 862, 1113, 1187, 1201,

1220, 1393, 1517, 1821, 1899,

1924, 2003, 2023, 2143, 2146, 2290,

2474, 2482, 2597, 2644, 2749,

2818, 2951, 3014, 3212, 3237, 3363,

3430, 3515, 3517, 3745, 3758,

4049, 4165, 4354, 4399, 4575, 4763,

4789, 4802, 4834, 4970, 5260,

5386, 5395, 5402, 5579, 5716, 5734,

5884, 5895, 6073, 6123, 6158,

6212, 6243, 6521, 6593, 6604, 6607,

6772, 6842, 6908, 6986, 7220,

7331, 7396, 7407, 7588, 7635, 7665,

7893, 7925, 7949, 8019, 8038,

8167, 8289, 8295, 8338, 8549, 8555,

8660, 8857, 8925, 9007, 9057,

9121, 9364, 9375, 9423, 9446, 9479,

9502, 9527, 9860, 9919, 9938, 10138, 10189,

10191, 10275, 10333, 10377, 10988, 11109,

11261, 11266, 11362, 11390, 11534, 11623,

11893, 11989, 12037, 12101, 12119, 12185,

12254, 12369, 12371, 12380, 12401, 12586,

12597, 12638, 12913, 12974, 13001, 13045,

13052, 13111, 13143, 13150, 13151, 13300.

2. The receiving apparatus as claimed in claim 1 , wherein the OFDM symbol is one of a plurality of OFDM symbols included in a frame, and
wherein the frame includes a preamble symbol, subframe boundary symbols, and data symbols.

3. The receiving apparatus as claimed in claim 2 , wherein the carrier indices of the set of carriers comprise carrier indices, when a position in the preamble symbol into which a preamble pilot is inserted and a position in the subframe boundary symbols into which a subframe boundary pilot is inserted are defined based on a pilot insertion pattern, and an edge pilot is inserted into a first carrier and a last carrier in each of the subframe boundary symbols.

4. The receiving apparatus as claimed in claim 3 , wherein the pilot insertion pattern is determined based on Dx=6, 12, 16, 24, 32, and
wherein the Dx is a difference of carrier indices between adjacent carriers into which a pilot is to be inserted.

5. The receiving apparatus as claimed in claim 2 , wherein the carrier indices of the set of carriers comprise carrier indices, when a position in the data symbols into which a scattered pilot is inserted is defined based on a pilot insertion pattern, and an edge pilot is inserted into a first carrier and a last carrier in each of the data symbols.

6. The receiving apparatus as claimed in claim 5 , wherein the pilot insertion pattern is determined based Dx=3, 4, 6, 8, 12, 16, 24, 32, and
wherein the Dx is a difference of carrier indices between adjacent carriers into which a pilot is inserted.

7. The receiving apparatus as claimed in claim 5 , wherein the pilot insertion pattern is determined based Dy=2, 4, and
wherein the Dy is a difference of symbol indices between successive pilots on a specific carrier.

8. The receiving apparatus as claimed in claim 1 , wherein the OFDM symbol comprises a plurality of symbols comprising a preamble symbol, subframe boundary symbols, and data symbols, and
wherein the carrier indices are determined based on a pattern of pilots inserted into the plurality of symbols.

9. A transmitter comprising at least one processor to implement:
a pilot inserter configured to insert pilots into first carriers of an orthogonal frequency division multiplexing (OFDM) symbol; and
a peak to average power ratio (PAPR) reducer configured to generate a signal for reducing the PAPR of the OFDM symbol,
wherein a fast fourier transform (FFT) size of the OFDM symbol is 16K, and
wherein the PAPR reducer is configured to generate the signal for reducing the PAPR of the OFDM symbol using a set of second carriers having carrier indices listed below:

FFT Size

(Number of

Reserved Tones)
Carrier Indices

16K

Assignees

• Samsung Electronics Co Ltd

Inventors

• Park Joo-Sung
• Oh Young-Ho

Classifications

• H04L27/2628

  Inverse Fourier transform modulators, e.g. inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators (H04L27/2634 takes precedence) · CPC title

• H04L27/262 Primary

  Reduction thereof by selection of pilot symbols · CPC title

• H04L27/2618 Primary

  Reduction thereof using auxiliary subcarriers · CPC title

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title

• H04L5/0007

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