AAS transmitter distortion improvement
US-9219505-B2 · Dec 22, 2015 · US
Transmission and reception method and apparatus for reducing peak to average power ratio in orthogonal frequency division multiplexing system
US9893919B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9893919-B2 |
| Application number | US-201615344490-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 4, 2016 |
| Priority date | Nov 5, 2015 |
| Publication date | Feb 13, 2018 |
| Grant date | Feb 13, 2018 |
How to read this patent
A practical reading order for non-experts. Skip the full description unless you need deep technical detail.
- Title
What the patent document calls the invention.
- Abstract
A short plain-language summary of the technical disclosure.
- Assignees and inventors
Who owns or filed the patent and who is credited as inventor.
- Key dates
Filing, priority, publication, and grant dates set the timeline.
- First independent claim
The legal scope of protection — read this for what is actually claimed.
- CPC / IPC classifications
Technology tags used to group this patent with similar filings.
- Citations and related patents
Prior art links and similar publications in this corpus.
Abstract
Official abstract text for this publication.
A transmission and reception method and apparatus for reducing a PAPR in an orthogonal frequency division multiplexing (OFDM) system are provided. A transmission method includes performing constellation rotation with respect to L input data symbols, performing L-point DFT spreading and circular extension on the constellation-rotated L data symbols to be K symbols, performing frequency domain (FD) windowing processing by multiplying the K circular-extended data symbols by a circular filter coefficient, and transmitting the processed data symbols.
First claim
Opening claim text (preview).
What is claimed is: 1. A transmission method for reducing a peak-to-average power ratio (PAPR) in an orthogonal frequency division multiplexing (OFDM) system, the method comprising: performing a constellation rotation with respect to L input data symbols; performing an L-point discrete Fourier transform (DFT) spreading and circular extension on the L constellation-rotated data symbols to be K symbols; performing a frequency domain (FD) windowing processing by multiplying the K circular-extended data symbols by a circular filter coefficient; and transmitting the processed data symbols, wherein L denotes a number of data symbols to be transmitted through a single OFDM symbol, and K denotes a circular filter spreading (CFS)-OFDM spreading factor. 2. The method of claim 1 , wherein, when binary phase shift keying (BPSK) is used as a constellation, an optimal phase value θ opt for the constellation rotation is determined to be an equation provided below: θ opt = π ( K - 1 L ± 1 2 ) . 3. The method of claim 2 , wherein the constellation rotation is performed by applying a shift index (shiftindex) optimized in the BPSK with respect to an element (S) i,j in a K-by-L circular filter matrix, as shown in an equation provided below: ( S ^ ) i , j = p i ⅇ - j 2 π ( i - 1 - shiftindex ) ( j - 1 ) L where shiftindex = K - 1 2 ± L 4 , wherein i denotes a frequency index and j denotes a symbol index. 4. The method of claim 1 , wherein, when QPSK is used as a constellation, an optimal phase value θ opt for the constellation rotation is determined to be an equation provided below: θ opt = π ( K - 1 L ± 1 or 3 4 ) , wherein L denotes the number of data symbols to be transmitted through a single OFDM symbol, and K denotes a CFS-OFDM spreading factor. 5. The method of claim 4 , wherein the constellation rotation is performed by applying a shift index (shiftindex) optimized in the QPSK with respect to an element (S) i,j in a K-by-L circular filter matrix, as shown in an equation provided below: ( S ^ ) i , j = p i ⅇ - j 2 π ( i - 1 - shiftindex ) ( j -
Assignees
Inventors
Classifications
- H04L27/2623Primary
Reduction thereof by clipping · CPC title
for offset or staggered quadrature phase shift keying · CPC title
Patent family
Related publications grouped by family.
External sources
Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US9893919B2 cover?
- A transmission and reception method and apparatus for reducing a PAPR in an orthogonal frequency division multiplexing (OFDM) system are provided. A transmission method includes performing constellation rotation with respect to L input data symbols, performing L-point DFT spreading and circular extension on the constellation-rotated L data symbols to be K symbols, performing frequency domain (F…
- Who is the assignee on this patent?
- Samsung Electronics Co Ltd, Postech Acad Ind Found, Samsung Electronics Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification H04L27/2623. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Feb 13 2018 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).