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
CN1817017BActive Publication Date: 2010-08-04TELEFON AB LM ERICSSON (PUBL)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
TELEFON AB LM ERICSSON (PUBL)
Publication Date
2010-08-04

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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.
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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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