M-ary quadrature amplitude modulation (MQAM)-mode-based physical-layer network coding wireless communication method

A technology of network coding and wireless communication, applied in the field of wireless communication, can solve the problem of low system performance, achieve high spectrum utilization, improve overall performance, and strong anti-interference ability

Inactive Publication Date: 2013-05-01
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problem of low system performance caused by the three time slots and four time slots required in the two-way relay channel in the existing transmission mode, the present invention proposes a wireless communication method based on physical layer network coding of the MQAM modulation mode

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  • M-ary quadrature amplitude modulation (MQAM)-mode-based physical-layer network coding wireless communication method
  • M-ary quadrature amplitude modulation (MQAM)-mode-based physical-layer network coding wireless communication method
  • M-ary quadrature amplitude modulation (MQAM)-mode-based physical-layer network coding wireless communication method

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specific Embodiment approach 1

[0030] Specific embodiment one: the wireless communication method based on the physical layer network coding of the MQAM modulation method described in this embodiment, the wireless communication method is suitable for a network containing two user nodes and only one relay node, the wireless communication method Achieved by the following steps:

[0031] Step 1: Generate two users N 1 , N 2 The encoded bit information S 1 , S 2 ;

[0032] Step 2: Align bit information S 1 , S 2 Perform MQAM modulation respectively to obtain the modulated signal s 1 (t), s 2 (t);

[0033] Step 3: The modulated signal s obtained in step 2 1 (t), s 2 (t) to the relay node N at the same time R send;

[0034] Step 4: Relay node N R The two modulated signals s that will be received 1 (t), s 2 (t) Add directly to obtain the sum signal r R(t);

[0035] Step 5: Relay node N R According to the decision rule, the sum signal r obtained in step 4 R (t) Make a judgment and obtain the signa...

specific Embodiment approach 2

[0041] Specific embodiment two: This embodiment is a further limitation of the wireless communication method based on the physical layer network coding of the MQAM modulation method described in the specific embodiment one, and the decision rule in the step five is:

[0042] Since the relay node N R To receive two channels of information at the same time S 1 , S 2 , for N R In other words, the channel at this time no longer satisfies the condition of "point-to-point" access, so it is impossible to accurately calculate the channel capacity of the multi-access channel. R The two judgment methods of , respectively correspond to the supremum and infimum of the channel capacity of the physical layer network coding based on multi-ary quadrature amplitude modulation,

[0043] The first judgment method is as follows: the receiver first determines r R (t) Make a hard decision to get the signal after the decision Then, according to the mapping criteria, the Mapped to network cod...

specific Embodiment approach 3

[0045] Specific embodiment 3: This embodiment is a further limitation of the wireless communication method based on the physical layer network coding of the MQAM modulation method described in the specific embodiment 1. In the wireless communication method: the lengths of data frames sent by two users are equal.

[0046] The purpose of this embodiment is to improve the working efficiency of the system. When performing physical layer network coding, two users should try their best to use data frames with basically the same amount of data.

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Abstract

The invention discloses an M-ary quadrature amplitude modulation (MQAM)-mode-based physical-layer network coding wireless communication method, and relates to the field of wireless communication. The problem of low system performance caused by three timeslots and four timeslots required by the conventional transmission mode in a two-way relaying channel is solved. The method specifically comprises the following steps of: performing MQAM on the coded bit information S1 and S2 of users N1 and N2 to obtain modulated signals s1(t) and s2(t), simultaneously transmitting the signals s1(t) and s2(t) to a relay node NR, directly adding the signals s1(t) and s2(t) by using the relay node NR to obtain a sum signal rR(t), judging the rR(t), and further mapping a judgment result into the network coding information SR of the S1 and the S2; and performing MQAM on the SR again by using the relay node NR, broadcasting the modulated signal sR(t) to the users N1 and N2, demodulating the received sR(t) by the N1 and the N2 respectively, and performing by-the-bit XOR operation on the obtained network coding information SR and transmitted information stored in a local cache of one user to obtain the bit information of the other user, so that an information exchange process is implemented. The method is applied to the wireless communication.

Description

technical field [0001] The invention relates to the field of wireless communication. Background technique [0002] An important feature that distinguishes wireless communication from wired communication is the broadcasting characteristics of its physical layer. In traditional communication systems, in order to minimize the mutual interference between different signals, there is often only one node to transmit or receive information at any time. This method Very inefficient in a multi-node network. In order to improve the low efficiency of multi-node network transmission, Cai and Li et al. proposed the concept of network coding (NC), which aims to use the computing power of intermediate nodes to perform mixed calculations on the forwarded data, so as to obtain more High information transmission capacity. With the further development of research, network coding has shown its superiority in improving network throughput, improving load balancing, reducing transmission delay, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L27/34
Inventor 于启月张德有韩露刘涛孟维晓
Owner HARBIN INST OF TECH
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