Unlock instant, AI-driven research and patent intelligence for your innovation.

DF (decoded-and-forward) protocol based full duplex relay method of similar repeater

A repeater, full-duplex technology, applied in the direction of duplex signal operation, network planning, electrical components, etc., can solve the problem of reducing the reachable rate of the system, and achieve the effect of improving system capacity, good feasibility and application value

Inactive Publication Date: 2012-09-12
SHANGHAI JIAO TONG UNIV
View PDF5 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Opportunistic relay still adopts the half-duplex working mode of OFDM, which reduces the reachable rate of the system, especially in some communication systems with high rate requirements, its weakness is particularly prominent

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • DF (decoded-and-forward) protocol based full duplex relay method of similar repeater
  • DF (decoded-and-forward) protocol based full duplex relay method of similar repeater
  • DF (decoded-and-forward) protocol based full duplex relay method of similar repeater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0027] This embodiment is a MIMO-OFDM system, the number of subcarriers is 1024, the communication bandwidth is 100M, and the carrier frequency is f c 14×10 9 Hz, the relay node uses SVD to equalize the original signal. The source node and the destination node are omnidirectional antennas, the donor antenna and retransmission antenna of the relay node are both directional antennas, the number of antennas is 4, the antenna gain of the omnidirectional antenna is 8dB, and the gain of the directional antenna is G d , G s 15dB, front to back ratio X d 、X s is 45dB, the distance s between the donor antenna and the retransmission antenna is 5m, and there is no baffle in the middle. The distances from the source node to the relay node and from the relay node to the destination node are both dm, and the channel is a Rice channel with a Rice factor of 8.61-0.27*d. The spatial path loss formula is Ls=23.9+20·logf c +23.2 logd. The power spectral density of the additive complex Gau...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a DF (decoded-and-forward) protocol based full duplex relay method of a similar repeater; the method comprises the steps that: a relay node is provided with two pairs of directional antennas as a donor antenna and a retransmission antenna which are used for aiming at a source node and a destination node respectively; the donor antenna of the relay node receives a signal from the source node and decodes and processes the micro signals coupled from the retransmission antenna as additive noise; the retransmission antenna of the relay node encodes and transmits the signal received by the relay node in the last time space at the same time when the donor antenna receives the signal of the source node; and then the destination node recovers the signal transmitted by the relay node. According to the DF protocol based full duplex relay method of the similar repeater, the time domain resource is made full use; due to the full duplex working mode, the achievable rate of the system is greatly enhanced, and the feasibility and practicality are high.

Description

technical field [0001] The invention relates to a method in the field of wireless communication relay, in particular to a repeater-like full-duplex relay method based on the DF relay protocol. Background technique [0002] In a wireless communication system, the signal will continue to attenuate during the transmission process, especially when transmitting at a higher carrier frequency, the attenuation problem is more serious. In order to improve signal strength and expand signal coverage, experts and scholars have proposed some important relay methods, such as AF, Amplified-and-Forward and (DF, Decoded-and-Forward), etc., but these The relay mode adopts time-division multiplexing to work, which greatly limits the achievable rate of the system. Although the repeater is in full-duplex mode, it amplifies the noise brought by the previous hop, and in order to avoid self-excitation, it requires that the attenuation between the donor antenna and the retransmission antenna be gre...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H04W16/26H04W88/04H04L5/14
Inventor 陈勇占敖何晨蒋铃鸽
Owner SHANGHAI JIAO TONG UNIV