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Double-relay wireless communication system diversity method

A wireless communication system and dual-relay technology, applied in relay system monitoring, radio relay systems, active electrical relay systems, etc., can solve problems such as increased system complexity, reduce system complexity, improve system performance, the effect of guaranteed communication performance

Inactive Publication Date: 2011-06-01
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If an optimal relay is selected by comparison every time, the system complexity will increase significantly

Method used

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  • Double-relay wireless communication system diversity method
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  • Double-relay wireless communication system diversity method

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Embodiment 1

[0031] figure 1 It is shown that the first embodiment of the present invention is a diversity method for a dual-relay wireless communication system, where a signal from a signal source S is forwarded to a destination D through a relay. There are two relays. Destination D does not use maximum ratio combining for communication. Destination D uses the following methods to select relays:

[0032] A. When the communication is initiated, a relay is randomly selected for communication. Before each communication occurs, the communication first estimates the instantaneous equivalent signal-to-noise ratio of the previous communication: that is, by estimating the signal source S to the previously selected relay R 1 the link of the previous relay R 1 The instantaneous signal-to-noise ratio to the destination D, so as to estimate the instantaneous equivalent signal-to-noise ratio of the previous communication.

[0033] The specific method of estimating the instantaneous signal-to-noise r...

Embodiment 2

[0052] Image 6 It is shown that the second embodiment of the present invention is a diversity method for a dual-relay wireless communication system. The signal from the signal source S is forwarded to the destination D through the relay; there are two relays, and the destination D adopts the maximum ratio Combined for communication, the destination D uses the following method to select the relay:

[0053] A. When the communication is initiated, a relay is randomly selected for communication. Before each communication occurs, the instantaneous equivalent signal-to-noise ratio of the previous communication is estimated first: that is, by estimating the signal source S to the destination D, and the signal source S to the destination D. Last selected relay R 1 the link of the previous relay R 1 The instantaneous signal-to-noise ratio to the destination D, so as to estimate the instantaneous equivalent signal-to-noise ratio of the previous communication.

[0054] The specific m...

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Abstract

The invention relates to a double-relay wireless communication system diversity method. In the communication process, a method for selecting a relay comprises the following steps: estimating the channel condition of the relay selected in the previous communication process before the current communication is carried out, and using the relay continuously if the channel condition of the relay meets the preset conditions; and otherwise, estimating the channel condition of the other relay, and then selecting a link with the best channel condition for communication from the two relays. A system applying the method has the advantages of low complexity and good transmission performance; and both the complexity and transmission performance of the system are preferably considered.

Description

technical field [0001] The invention relates to a diversity method for communication by selecting a relay in a double relay wireless communication system. Background technique [0002] The requirements for data transmission rate in future wireless communication systems are rapidly expanding, but the frequency resources available for mobile communication are very limited. In order to support higher speed data transmission under the condition of limited frequency resources, new high spectrum efficiency technologies must be studied. Diversity technology is an anti-fading technology for mobile communications. It is a powerful transmission technology that can greatly improve the performance of wireless links with relatively low investment. It mainly includes frequency diversity, time diversity and space diversity. The space diversity technology (MIMO) using multiple antennas at the signal source or (and) destination and the multi-user diversity in a multi-user environment are imp...

Claims

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Application Information

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IPC IPC(8): H04B7/15H04B7/04H04B17/02H04B17/00H04B17/40H04L25/02
Inventor 类先富范平志陈庆春郝莉颜矛
Owner SOUTHWEST JIAOTONG UNIV
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