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

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

Inactive Publication Date: 2007-08-08
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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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

[0023] A specific embodiment of the present invention will be described below in conjunction with FIG. 3 , so as to further understand the content of the present invention.

[0024] As shown in Figure 3, this scheme of the present invention is suitable for the multi-level quadrature amplitude modulation scheme that DSP realizes and comprises the following steps (taking 16QAM as example):

[0025] Step 1, obtain a demodulated 16QAM symbol S k ;

[0026] Step 2, judgment formula Re(S k )>0 is established, if not, go to step 4;

[0027] Step 3, update the array index value Index=Index+8;

[0028] Step 4, judgment formula Im(S k )<0 is true, if not, go to step 6;

[0029] Step 5, update the array index value Index=Index+4;

[0030] Step 6, Judgment | Re ( S k ) | - E ( Re ( ...

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Abstract

The invention relates to one MQAM hard judgment method in hard judgment in the multiple level cross range modulation communication system, which comprises the following steps: storing each signal point relative hard judgment two bit in star pattern on sequence number into one data set; receive end processes the demodulated character information to get data set index value according to this invention method and steps and then gets the character hard judgment results according to the index value.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular 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. 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 quadratur...

Claims

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Application Information

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IPC IPC(8): H04L27/34H04L27/38H04L25/06
Inventor 曾嵘
Owner HANGZHOU DIANZI UNIV
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