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Beam forming method of multi-hop and multi-relay collaborative network

A beamforming and relay node technology, applied in diversity/multi-antenna systems, baseband system components, space transmit diversity, etc., can solve problems such as unsatisfactory effects

Inactive Publication Date: 2013-08-28
SHANDONG UNIV
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Problems solved by technology

Previous researchers have used an approximate method to convert the above problem into a semi-positive definite problem, and then achieve near-optimal beamforming, but the effect of this method is not ideal

Method used

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  • Beam forming method of multi-hop and multi-relay collaborative network
  • Beam forming method of multi-hop and multi-relay collaborative network
  • Beam forming method of multi-hop and multi-relay collaborative network

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Embodiment Construction

[0018] Aiming at the problems faced by the existing three-hop multi-relay beamforming optimization, the present invention proposes a joint optimization method for realizing two groups of relay group beamforming weight vectors by comprehensively using methods such as an iterative method. The joint optimization problem is non-convex and multi-vector, which is difficult to realize by common methods. The present invention converts the original problem into a single vector by fixing one of the weight vectors, which is easy to solve with existing methods, and obtains another beam Shape the weight vector, then fix the obtained weight vector, and then optimize the first weight vector, and finally obtain two beamforming weight vectors through multiple iterations.

[0019] The present invention will be further described below in conjunction with the drawings and embodiments, but not limited to this example.

[0020] Consider a three-hop multi-relay cooperative communication system based...

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Abstract

The invention provides a beam forming method for a three-hop relay collaborative communication model. Under the condition that the total power of a relay node is strived not to exceed a certain threshold value, the received signal-to-noise ratio of a destination node is maximum. Two relay node groups exist in the three-hop relay collaborative communication, and each group corresponds to respective beam forming weight vectors. The beam forming method alternately fixes two relay node group weight vectors, applies semi-definite relaxation to convert the original problem into a convex optimization problem, then applies methods, like an interior point method, passes through a plurality of iterations, and finally achieves joint optimization of two weight vectors.

Description

technical field [0001] The invention discloses a beamforming method of a multi-hop and multi-relay cooperative network, belonging to the technical fields of wireless communication and signal processing. Background technique [0002] With the rapid development of wireless communication, people have higher and higher requirements on the quality of service and quality of experience of wireless communication. Multiple-input multiple-output (MIMO) technology can effectively improve spectrum utilization and improve system reliability when spectrum resources are fixed, and multiple ways of diversity including time, frequency, coding, and space have been developed. For portable devices, it is very difficult to install multiple antennas due to volume and energy constraints. In order to solve the above problems, collaborative communication emerges as the times require. [0003] A wireless network model can usually be regarded as a collection of nodes that can communicate with each o...

Claims

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Application Information

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IPC IPC(8): H04B7/06H04L25/02
Inventor 刘琚王超许宏吉董郑王清卢冰冰
Owner SHANDONG UNIV
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