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

Patent metadata

Field	Value
Publication number	US-11329852-B2
Application number	US-202017017959-A
Country	US
Kind code	B2
Filing date	Sep 11, 2020
Priority date	Jun 9, 2015
Publication date	May 10, 2022
Grant date	May 10, 2022

Abstract

A method of determining reserved tones to be used for reduction of a peak to average power ratio (PAPR) of a signal includes: randomly selecting carrier indices for the reserved tones and generating a kernel signal based on the randomly selected carrier indices; calculating a comparison reference average value of the kernel signal, comparing the calculated comparison reference average value with a prestored comparison reference average value, and preliminarily determining carrier indices of the reserved tones based on the comparison; randomly re-arranging an order of the preliminarily determined carrier indices of the reserved tones; and calculating the comparison reference average value while changing each of the re-arranged indices of the reserved tones, and finally determining carrier indices for which the calculated comparison reference average value becomes the smallest value as carrier indices of the reserved tones.

First claim

What is claimed is:

1. A transmitting apparatus 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 reserve second carriers of the OFDM symbol for reducing a PAPR,
wherein a fast fourier transform (FFT) size of the OFDM symbol is 32K, and
wherein a set of the second carriers have carrier indices listed below:

FFT Size

(Number

of

Reserved

Tones)
Carrier Indices

32K
803, 805, 811, 901, 1001, 1027, 1245, 1258, 1318, 1478,

(288)
1507, 1509, 1556, 1577, 1655, 1742, 1978, 2001, 2056, 2110,

2164, 2227, 2305, 2356, 2408, 2522, 2563, 2780, 2805, 2879,

3010, 3019, 3128, 3389, 3649, 3730, 3873, 4027, 4066, 4087,

4181, 4246, 4259, 4364, 4406, 4515, 4690, 4773, 4893, 4916,

4941, 4951, 4965, 5165, 5222, 5416, 5638, 5687, 5729, 5930,

5997, 6005, 6161, 6218, 6292, 6344, 6370, 6386, 6505, 6974,

7079, 7114, 7275, 7334, 7665, 7765, 7868, 7917, 7966, 8023,

8055, 8089, 8091, 8191, 8374, 8495, 8651, 8690, 8755, 8821,

9139, 9189, 9274, 9561, 9611, 9692, 9711, 9782, 9873, 9964,

10011, 10209, 10575, 10601, 10623, 10690, 10967, 11045,

11083, 11084, 11090, 11128, 11153, 11530, 11737, 11829,

11903, 11907, 11930, 11942, 12356, 12429, 12484, 12547,

12562, 12605, 12767, 12863, 13019, 13052, 13053, 13167,

13210, 13244, 13259, 13342, 13370, 13384, 13447, 13694,

13918, 14002, 14077, 14111, 14216, 14243, 14270, 14450,

14451, 14456, 14479, 14653, 14692, 14827, 14865, 14871,

14908, 15215, 15227, 15284, 15313, 15333, 15537, 15643,

15754, 15789, 16065, 16209, 16213, 16217, 16259, 16367,

16369, 16646, 16780, 16906, 16946, 17012, 17167, 17192,

17325, 17414, 17629, 17687, 17746, 17788, 17833, 17885,

17913, 18067, 18089, 18316, 18337, 18370, 18376, 18440,

18550, 18680, 18910, 18937, 19047, 19052, 19117, 19383,

19396, 19496, 19601, 19778, 19797, 20038, 20357, 20379,

20455, 20669, 20707, 20708, 20751, 20846, 20853, 20906,

21051, 21079, 21213, 21267, 21308, 21355, 21523, 21574,

21815, 21893, 21973, 22084, 22172, 22271, 22713, 22905,

23039, 23195, 23303, 23635, 23732, 23749, 23799, 23885,

23944, 24149, 24311, 24379, 24471, 24553, 24585, 24611,

24616, 24621, 24761, 24789, 24844, 24847, 24977, 25015,

25160, 25207, 25283, 25351, 25363, 25394, 25540, 25603,

25647, 25747, 25768, 25915, 25928, 26071, 26092, 26139,

26180, 26209, 26270, 26273, 26278, 26326, 26341, 26392,

26559, 26642, 26776, 26842.

2. The transmitting 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 transmitting apparatus as claimed in claim 2 , wherein the set of second carriers have the 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 transmitting apparatus as claimed in claim 3 , wherein the pilot insertion pattern is determined based on Dx=6, 12, 16, 24, 32, and
wherein Dx is a difference of carrier indices between adjacent carriers into which a pilot is to be inserted.

5. The transmitting apparatus as claimed in claim 2 , wherein the set of second carriers have the carrier indices, when a position in the data symbols into which a scattered 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 data symbols.

6. The transmitting 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 Dx is a difference of carrier indices between adjacent carriers into which a pilot is to be inserted.

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

8. A receiving apparatus comprising:
a processor configured to process a frame received from a transmitting apparatus based on positions of reserved tones for a peak to average power ratio (PAPR) reduction,
wherein the frame comprises an orthog

Assignees

• Samsung Electronics Co Ltd

Inventors

• Park Joo-Sung
• Oh Young-Ho

Classifications

• H04L27/262 Primary

  Reduction thereof by selection of pilot symbols · CPC title

• H04L27/26134

  Pilot insertion in the transmitter chain, e.g. pilot overlapping with data, insertion in time or frequency domain · CPC title

• H04B1/04 Primary

  Circuits · 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