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Appts and method for calculating channel decoder input soft decision value in data communications system

A soft decision-making and calculator technology, applied in the direction of digital transmission system, transmission system, baseband system, etc., can solve problems such as increasing calculation amount and increasing hardware complexity

Inactive Publication Date: 2004-03-10
SAMSUNG ELECTRONICS CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

However, this program requires increased computation compared to the simple metric program, thus resulting in significantly increased hardware complexity

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  • Appts and method for calculating channel decoder input soft decision value in data communications system
  • Appts and method for calculating channel decoder input soft decision value in data communications system
  • Appts and method for calculating channel decoder input soft decision value in data communications system

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Embodiment Construction

[0029] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the following embodiments, well-known functions or constructions are not described in detail.

[0030] One embodiment of the present invention provides an apparatus and method for obtaining soft decision values ​​input to a channel decoder without using mapping tables or complex functions in a demodulator for a data communication system using 64-ary QAM , the soft decision value is calculated by a double minimum metric procedure.

[0031] An algorithm for generating multi-dimensional soft decision values ​​from a 2-dimensional received signal is described below. The output sequence of the binary channel coder is divided into m bits and mapped according to the Gray coding rule in M(=2 m ) corresponding signal point among the signal points. This can be expressed as

[0032] Equation (1) s k , ...

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Abstract

A 64-ary QAM (Quadrature Amplitude Modulation) demodulation apparatus and method for receiving an input signal R k (X k ,Y k ) comprised of a k th quadrature-phase signal Y k and a k th in-phase signal X k , and generating soft decision values A(s k,5 ), A(s k,4 ), A(s k,3 ), A(s k,2 ), A(s k,1 ) and A(s k,0 ) for the input signal R k (X k , Y k ) are disclosed. A first soft decision value generator receives the quadrature-phase signal Y k of the received signal R k and a distance value 2a between six demodulated symbols on the same axis, and generates soft decision values A(s k,5 ), A(s k,4 ) and A(s k,3 ) for sixth, fifth and fourth demodulated symbols. A second soft decision value generator receives the in-phase signal X k of the received signal R k and the distance value 2a between the six demodulated symbols on the same axis, and generates soft decision values A(s k,2 ), A(s k,1 ) and A(s k,0 ) for third, second and first demodulated symbols.

Description

technical field [0001] The present invention generally relates to a demodulation apparatus and method for a data communication system using multilevel modulation, and in particular to a demodulator for computing a data communication system using 64-element QAM (Quadrature Amplitude Modulation). An apparatus and method for an input value of a channel decoder. Background technique [0002] Typically, data communication systems use multi-level modulation in order to improve spectral efficiency. Multilevel modulation includes various modulation techniques. Here, 64-ary QAM, one of the multi-level modulation techniques, will be used as a reference. As known to those skilled in the art, a 64-ary QAM channel encoder modulates a signal encoded by binary encoding and transmits the encoded signal to a receiver. The computer then receives the transmitted modulated signal and decodes the modulated signal by soft decision value decoding in a channel decoder. To perform decoding, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M13/45H03M5/12H04L25/06H04L27/00H04L27/34H04L27/38
CPCH04L27/38H04L25/067H04L27/34
Inventor 河相赫金潣龟
Owner SAMSUNG ELECTRONICS CO LTD