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

Patent metadata

Field	Value
Publication number	US-2016365998-A1
Application number	US-201615177522-A
Country	US
Kind code	A1
Filing date	Jun 9, 2016
Priority date	Jun 9, 2015
Publication date	Dec 15, 2016
Grant date	—

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 method of determining reserved tones to be used for reduction of a peak to average power ratio (PAPR) of a signal, the method comprising:
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.

2 . The method as claimed in claim 1 , wherein the generating the kernel signal based on the randomly selected carrier indices for the reserved tones, the kernel signal is generated by randomly selecting carrier indices for the reserved tones among carrier indices other than carrier indices into which a pilot is inserted, inserting one (1) into carriers of the randomly selected carrier indices, and performing Inverse Fast Fourier Transform (IFFT) on the carriers into which one (1) is inserted.

3 . The method as claimed in claim 1 , wherein the comparison reference average value of the kernel signal is an average value of amplitudes of peak signals satisfying a predetermined condition, except a peak signal having the greatest amplitude, among the plurality of peak signals of the kernel signal.

4 . The method as claimed in claim 3 , wherein the predetermined condition is a condition that the peak signals belong to a predetermined top range of amplitude except the peak signal having the greatest amplitude and another predetermined top range of amplitude based on an amplitude of a peak signal having the second-largest amplitude, among the plurality of peak signals of the kernel signal.

5 . The method as claimed in claim 1 , wherein in the preliminarily determining the carrier indices of the reserved tones, a smaller comparison reference average value among the calculated comparison reference average value and the prestored comparison reference average value is compared with a preset value, and carrier indices for a kernel signal having the smaller comparison reference average value which is smaller than the preset value is preliminarily determined as the indices of the reserved tones.

6 . The method as claimed in claim 1 , wherein the comparison reference average values are calculated by sequentially changing respective carrier indices included in the re-arranged carrier indices of the reserved tones to other carrier indices where a pilot is not positioned and the preliminarily determined reserved tones are not positioned.

7 . A transmitter comprising:
a frame generator configured to generate a frame including a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols having a Fast Fourier Transform (FFT) size of 32K; a pilot inserter configured to insert a pilot into first carriers of the plurality of OFDM symbols, respectively; and a peak to average power ratio (PAPR) reducer configured to insert a signal for reducing a PAPR into second carriers reserved in at least one of the plurality of OFDM symbols into which the pilot is inserted, wherein the second carriers have carrier indices defined as follows.

FFT Size

(Number of

Reserved Tones)
Carrier Indices

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

(288)
1478, 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,

Assignees

• Samsung Electronics Co Ltd

Inventors

• Park Joo-Sung
• Oh Young-Ho

Classifications

• H04B17/10

  of transmitters · CPC title

• H04L5/0005

  Time-frequency · CPC title

• H04L5/0007

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

• H04L27/2618

  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