Method and system for estimating element cluster decision border of M-QAM in communication systems

A symbol and decision-making technology, applied in the field of multi-level quadrature amplitude modulation detection, can solve problems such as slow estimation speed, complex calculation, and complexity

Active Publication Date: 2010-08-04
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Disadvantages of this method also include complexity and noisy estimates due to the non-linear transformation
[0014] The problem with the above approach is that it requires complex calculations, which leads to slow estimation speed (which leads to increased memory overhead) and noisy decision boundary estimates

Method used

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  • Method and system for estimating element cluster decision border of M-QAM in communication systems
  • Method and system for estimating element cluster decision border of M-QAM in communication systems
  • Method and system for estimating element cluster decision border of M-QAM in communication systems

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Embodiment Construction

[0030] Various aspects will now be described in conjunction with exemplary embodiments based on multiple sequences of actions that can be executed by multiple units of the computer system. For example, it can be recognized that in various embodiments, it may be through specialized circuits or lines (for example, discrete logic gates interconnected to perform specialized functions), through program instructions executed by one or more processors, or through The combination of the two executes each action. Therefore, the various aspects can be implemented in a variety of different forms, and all of these forms are considered to be within the scope of what is described. For each of the various aspects, any of this form of embodiment may refer to "logic configured to perform the action", or alternatively, to "execute or be able to perform the action". logic".

[0031] The multiple sequences of actions can be implemented in any computer-readable medium used by the instruction execut...

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Abstract

A method and system are described for performing fast and simple M-QAM detection on received signals, such as a 16-QAM signal, by estimating M-QAM symbol constellation decision boundaries. Amplitude information is collected for in-phase and quadrature phase components of the received signal over a number of symbols. An average of the absolute value of the amplitude information of the in-phase components and of the quadrature phase components is determined over the number of symbols. The determined average absolute values of the in-phase and quadrature phase components provide a reference to produce the decision boundary estimates. Bias compensation may optionally be applied to the decision boundary estimates based on the estimated signal-to-interference ratio (''SIR'') of the received signal to produce bias corrected decision boundary estimates.

Description

Technical field [0001] The present invention relates to the detection of modulated signals used in wireless communication. More specifically, the present invention relates to multi-level quadrature amplitude modulation ("M-QAM") detection in communication systems. Background technique [0002] In a digital communication system, digital symbols representing information are transferred between different nodes (e.g., base stations, mobile phones) to exchange information. [0003] A layered model called the Open Systems Interconnection ("OSI") model is often used to describe communication systems. The lowest layer in this model (where the information stream composed of multiple bits is transmitted) is usually called the physical layer, and information is usually transmitted on different physical channels. The physical channel provides services with a predetermined quality according to this structure. In a simplified description, the physical channel includes formation of multiple bi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/38
CPCH04B2201/709727H04L25/061H04L27/3809H04L27/34H04L27/38
Inventor 彼得·马尔姆本特·林多夫安德里亚·塞德格伦
Owner TELEFON AB LM ERICSSON (PUBL)
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