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Wireless communication method for physical network coding in flat frequency-selective fading channel, based on two-way relay model

A two-way relay, fading channel technology, applied in the direction of digital transmission system, electrical components, error prevention, etc.

Inactive Publication Date: 2013-03-20
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But these schemes often increase the complexity of the communication architecture and the complexity of the relay receiver

Method used

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  • Wireless communication method for physical network coding in flat frequency-selective fading channel, based on two-way relay model
  • Wireless communication method for physical network coding in flat frequency-selective fading channel, based on two-way relay model
  • Wireless communication method for physical network coding in flat frequency-selective fading channel, based on two-way relay model

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specific Embodiment approach 1

[0032] Specific implementation mode 1. Combination figure 1 , figure 2 and image 3 Describe this embodiment, the wireless communication method of physical layer network coding in the flat frequency selective fading channel based on two-way relay model described in this embodiment, the specific implementation steps of this method are:

[0033] Step 1. In the first time slot, the source nodes S1 and S2 respectively compare the input information data d 1 (t) and d 2 (t) Perform QPSK modulation to obtain the modulated signal s 1 (t) and s 2 (t);

[0034] Step 2. The source nodes S1 and S2 respectively convert the modulated signal s obtained in Step 1 1 (t) and s 2 (t) Perform precoding to obtain the precoded signal x 1 (t) and x 2 (t);

[0035] Step 3. The precoded signal x to be obtained by source nodes S1 and S2 1 (t) and x 2 (t) Perform carrier modulation to obtain a carrier-modulated signal, and simultaneously send the obtained carrier-modulated signal to the re...

specific Embodiment approach 2

[0046] Specific embodiment 2. This embodiment is a further description of the wireless communication method of physical layer network coding in a flat frequency-selective fading channel based on the two-way relay model described in specific embodiment 1. The precoding described in step 2 is obtained after signal x 1 (t) and x 2 (t) by the formula:

[0047] x 1 ( t ) = w 1 s 1 ( t ) x 2 ( t ) = w ...

specific Embodiment approach 3

[0051] Specific Embodiment 3. This embodiment is a further description of the wireless communication method for physical layer network coding in a flat frequency-selective fading channel based on the two-way relay model described in Embodiment 1. The carrier solution is obtained in step 4. modulated sum signal r R (t) by the formula:

[0052] r R (t)=(|h 1 |x 1 (t)+|h 2 |x 2 (t))+n 0 (3)

[0053] Calculated, where, n 0 is additive white Gaussian noise, h 1 and h 2 are the channel coefficients from source node S1 and source node S2 to relay node SR, respectively.

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Abstract

The invention relates to a wireless communication method, in particular to a wireless communication method of physical network coding in a flat frequency-selective fading channel, based on a two-way relay model. The method eliminates interferences between a real part and an imaginary part of a modulation signal, and reduces the complexity of a relay receiver. The method comprises the steps that two information source nodes perform QPSK (Quadrature Phase Shift Keying) modulation, precoding, carrier modulation and re-carrier modulation on information data, and then send the information data to a relay node; the relay node sums received signals, then performs the carrier demodulation on the summed signals, and solves broadcast data by judging and mapping; then, the relay node performs the QPSK modulation and the carrier modulation on the broadcast data, and broadcasts and sends the broadcast data; the information source nodes perform the carrier demodulation on carrier modulation signals received with broadcast; after the information source node S1 and the information source node S2 perform signal processing on the signals being subjected to the carrier modulation respectively, the information source node S1 obtains an estimated value of the signals sent by the information source node S2; and the information source node S2 obtains an estimated value of the signals sent by the information source node S1, thereby accomplishing communication. The method is applied to wireless communication.

Description

technical field [0001] The present invention relates to wireless communication methods. Background technique [0002] The new generation of wireless communication requires high-speed data transmission services. Considering the characteristics of wireless communication path transmission loss, multi-hop transmission can provide the possibility of high-speed data transmission without increasing the transmission power of the base station. As a typical multi-hop transmission system, wireless relay transmission has attracted the attention of many researchers. By using wireless relay, the system capacity of the cell can be improved without changing the structure and size of the existing cell, and at the same time, better services can be provided for users at the edge of the cell. [0003] Due to hardware limitations, the relay can only be in half-duplex communication mode. If the relay is directly used for data exchange without other technologies, the actual throughput of the sys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00
Inventor 于启月罗德巳孟维晓
Owner HARBIN INST OF TECH
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