System and Method for Mapping Symbols for MIMO Transmission
US-2017126301-A1 · May 4, 2017 · US
Likelihood generation apparatus and method therefor
US2016344580A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2016344580-A1 |
| Application number | US-201515112652-A |
| Country | US |
| Kind code | A1 |
| Filing date | Feb 16, 2015 |
| Priority date | Mar 13, 2014 |
| Publication date | Nov 24, 2016 |
| Grant date | — |
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 likelihood generation apparatus for acquiring a likelihood of a 16QAM signal includes a first likelihood generation unit configured to generate a likelihood of each of two bits of a 16QAM signal point of the 16QAM signal from a relationship of each of an I-axis component and a Q-axis component with a likelihood when the 16QAM signal point is mapped on a constellation diagram, and a second likelihood generation unit configured to generate a likelihood of each of remaining two bits other than the two bits of the 16QAM signal point of the 16QAM signal based on a position of the 16QAM signal point in a lookup table, which is configured to input the I-axis component and the Q-axis component of the 16QAM signal point as arguments, and includes regions acquired by dividing the constellation diagram based on a possible value of each of the bits.
First claim
Opening claim text (preview).
1 . A likelihood generation apparatus for acquiring a likelihood of a 16QAM signal, the likelihood generation apparatus comprising: a first likelihood generation unit configured to generate a likelihood of each of two bits of each of 16QAM signal points of the 16QAM signal from a relationship of each of an I-axis component and a Q-axis component with a likelihood when the each of the 16QAM signal points is mapped on a constellation diagram; and a second likelihood generation unit configured to generate a likelihood of each of remaining two bits other than the two bits of the each of the 16QAM signal points of the 16QAM signal based on a position of the each of the 16QAM signal points in a lookup table, which is configured to input the I-axis component and the Q-axis component of the each of the 16QAM signal points as arguments, and includes regions acquired by dividing the constellation diagram based on a possible value of each of the bits. 2 . The likelihood generation apparatus according to claim 1 , further comprising a first quadrant rotation unit provided on an input side of the second likelihood generation unit, and configured to rotate the each of the 16QAM signal points to a first quadrant of the constellation diagram. 3 . The likelihood generation apparatus according to claim 1 , further comprising a delay unit provided at an input of the first likelihood generation unit, and configured to hold a reception signal one symbol before. 4 . A likelihood generation method for acquiring a likelihood of a 16QAM signal, the likelihood generation method comprising: generating a likelihood of each of two bits of each of 16QAM signal points of the 16QAM signal from a relationship of each of an I-axis component and a Q-axis component with a likelihood when the each of the 16QAM signal points is mapped on a constellation diagram; and generating a likelihood of each of remaining two bits other than the two bits of the each of the 16QAM signal points of the 16QAM signal based on a position of the each of the 16QAM signal points in a lookup table, which is configured to input the I-axis component and the Q-axis component of the each of the 16QAM signal points as arguments, and includes regions acquired by dividing the constellation diagram based on a possible value of each of the bits. 5 . The likelihood generation method according to claim 4 , further comprising rotating the each of the 16QAM signal points to a first quadrant of the constellation diagram when the likelihood of the each of the remaining two bits other than the two bits is generated. 6 . The likelihood generation method according to claim 4 , further comprising applying differential decoding to the each of the 16QAM signal points when the likelihood of the each of the two bits of the each of the 16QAM signal points is generated.
Assignees
Inventors
Classifications
- H04L27/3483Primary
using a modulation of the constellation points · CPC title
wherein the received signal is demodulated using one or more delayed versions of itself · CPC title
- H04L27/38Primary
Demodulator circuits; Receiver circuits · CPC title
by applying a certain rotation to regular constellations · CPC title
providing soft decisions, i.e. decisions together with an estimate of reliability (H04L25/068 and H04L25/069 take precedence; sequence estimation techniques H04L25/03178) · 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 US2016344580A1 cover?
- A likelihood generation apparatus for acquiring a likelihood of a 16QAM signal includes a first likelihood generation unit configured to generate a likelihood of each of two bits of a 16QAM signal point of the 16QAM signal from a relationship of each of an I-axis component and a Q-axis component with a likelihood when the 16QAM signal point is mapped on a constellation diagram, and a second lik…
- Who is the assignee on this patent?
- Mitsubishi Electric Corp
- What technology area does this patent fall under?
- Primary CPC classification H04L27/3483. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Thu Nov 24 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).