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Hard-decision method fitted for implementation of multilevel quadrature amplitude modulation

A quadrature amplitude modulation and hard decision technology, applied in the field of communication, can solve the problems of resource waste and occupation of processor resources, etc.

Inactive Publication Date: 2009-07-22
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Modern communication systems often use 256QAM and 512QAM to increase the transmission rate of information. At this time, there will be 256 and 512 logical branches. If the judgment of such a large logical branch is realized by a digital signal processor (DSP), it will take up A large number of processor resources, if implemented with a field programmable logic gate array (FPGA), will cause greater waste of resources

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  • Hard-decision method fitted for implementation of multilevel quadrature amplitude modulation
  • Hard-decision method fitted for implementation of multilevel quadrature amplitude modulation
  • Hard-decision method fitted for implementation of multilevel quadrature amplitude modulation

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Embodiment Construction

[0022] Combine below image 3 A specific embodiment of the present invention is described to further understand the content of the present invention.

[0023] Such as image 3 Shown, this scheme of the present invention is suitable for the multilevel quadrature amplitude modulation scheme (16QAM) that DSP realizes and comprises the steps:

[0024] Step 1, obtain a demodulated 16QAM symbol S k ;

[0025] Step 2, judgment formula Re(S k )>0 is established, if not, go to step 4;

[0026] Step 3, update the array index value Index=Index+8;

[0027] Step 4, judgment formula Im(S k )<0 is true, if not, go to step 6;

[0028] Step 5, update the array index value Index=Index+4;

[0029] Step 6, Judgment | Re ( S k ) | - E ( Re ( S ) ...

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Abstract

The invention relates to an MQAM hard decision method suitable for realization when a receiving end performs hard decision in a multi-level quadrature amplitude modulation (MQAM) communication system. The basic idea of ​​the present invention is to assign a certain serial number to each symbol on the MQAM constellation diagram according to a certain rule. Store the hard-decision binary values ​​corresponding to each signal point on the constellation diagram into an array in the order of serial numbers. The receiving end processes the demodulated symbol information, obtains the index value of the array according to the method and steps provided by the present invention, and then searches the value in the corresponding array according to the index value to obtain the hard decision result of the symbol. The method of the present invention memorizes the previous logical judgment results by changing the index value of the array, thereby saving a lot of processing time and reducing the amount of code, and each step can overlap in processing time, thereby further reducing the cost of MQAM hard judgment Processing delay.

Description

technical field [0001] The invention belongs to the technical field of communication, in particular to a 16QAM hard decision method suitable for realization when a receiving end performs hard decision in a multi-level quadrature amplitude modulation (16QAM) communication system. Background technique [0002] With the development of the times, people's requirements for communication, including requirements for communication quality and service types, are getting higher and higher. With the development of communication technology, people have higher and higher requirements for the speed of information transmission. In the context of today's increasingly tight frequency resources, to transmit more information within a limited frequency band, a common method is to use high-order modulation techniques. Today's common digital high-order modulation techniques include: multilevel phase shift keying (MPSK), multilevel frequency shift keying (MFSK) and multilevel quadrature amplitude...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/34H04L27/38H04L25/06
Inventor 曾嵘
Owner HANGZHOU DIANZI UNIV