Communication method and apparatus in high-frequency scenario
US-2024372772-A1 · Nov 7, 2024 · US
Apparatus and method for soft-decision demodulating in non-square quadrature amplitude modulation
US2016337081A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2016337081-A1 |
| Application number | US-201615151768-A |
| Country | US |
| Kind code | A1 |
| Filing date | May 11, 2016 |
| Priority date | May 15, 2015 |
| Publication date | Nov 17, 2016 |
| Grant date | — |
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Abstract
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Disclosed are an apparatus and a method for soft-decision demodulating in non-square quadrature amplitude modulation. The apparatus includes: a signal receiving unit receiving a quadrature amplitude modulation (QAM) modulated signal at an m modulation degree at a transmitting side; a soft-decision bit calculating unit determining a soft-decision bit value by calculating log likelihood ratios (LLRs) for m bits of the received QAM modulated signal; and a signal decoding unit restoring the received QAM modulated signal based on the determined soft-decision bit value, in which the soft-decision bit calculating unit defines a log likelihood ratio calculation equation by approximating soft-decision boundary points of constellation points for m bits of non-square QAM having odd bits, respectively.
First claim
Opening claim text (preview).
What is claimed is: 1 . An apparatus for soft-decision demodulating in non-square quadrature amplitude modulation, the apparatus comprising: a signal receiving unit receiving a quadrature amplitude modulation (QAM) modulated signal at an m modulation degree at a transmitting side; a soft-decision bit calculating unit determining a soft-decision bit value by calculating log likelihood ratios (LLRs) for m bits of the received QAM modulated signal; and a signal decoding unit restoring the received QAM modulated signal based on the determined soft-decision bit value, wherein the soft-decision bit calculating unit defines a log likelihood ratio calculation equation by approximating soft-decision boundary points of constellation points for m bits of non-square QAM having odd bits, respectively. 2 . The apparatus of claim 1 , wherein the soft-decision bit calculating unit calculates a log likelihood ratio for a first bit by using an I channel value. 3 . The apparatus of claim 1 , wherein the soft-decision bit calculating unit calculates a log likelihood ratio for a second bit by using a Q channel value. 4 . The apparatus of claim 1 , wherein the soft-decision bit calculating unit calculates a log likelihood ratio for a third bit by using an equation given below: L L R ( b 2 ) ≅ { y Q [ n ] - 4 d y Q [ n ] > y I [ n ] y I [ n ] - 4 d , elsewhere where y I [n] represents an I channel value, y Q [n] represents a Q channel value, and d represents a distance value of a partition boundary when the bits b 2 =1 and b 2 =0. 5 . The apparatus of claim 1 , wherein the soft-decision bit calculating unit calculates a log likelihood ratio for a fourth bit by using an equation given below: L L R ( b 3 ) ≅ { max ( y I [ n ] - 2 d , - y Q [ n ] + 4
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Classifications
Block codes (H04L1/0061, H04L1/0064 take precedence) · CPC title
- H04L27/38Primary
Demodulator circuits; Receiver circuits · CPC title
Broadband local area networks · CPC title
- H04L1/0054Primary
Maximum-likelihood or sequential decoding, e.g. Viterbi, Fano, ZJ algorithms · CPC title
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- What does patent US2016337081A1 cover?
- Disclosed are an apparatus and a method for soft-decision demodulating in non-square quadrature amplitude modulation. The apparatus includes: a signal receiving unit receiving a quadrature amplitude modulation (QAM) modulated signal at an m modulation degree at a transmitting side; a soft-decision bit calculating unit determining a soft-decision bit value by calculating log likelihood ratios (L…
- Who is the assignee on this patent?
- Electronics & Telecommunications Res Inst
- What technology area does this patent fall under?
- Primary CPC classification H04L27/38. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Thu Nov 17 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 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).