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Wave-beam forming method based on cognitive hybrid two-way relay

A beamforming, two-way relay technology, applied in space transmit diversity, radio transmission systems, network planning, etc., can solve problems such as amplifying noise, and achieve the effects of improving amplification, reducing interference, and improving system performance

Active Publication Date: 2016-06-08
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0004] Technical problem: The present invention discloses a beamforming method based on cognitive hybrid two-way relay, which applies a more reasonable relay forwarding scheme at the relay end, that is, the AF+DF mode, which effectively improves the cognitive two-way relay system The problem that the single AF forwarding method will amplify the signal and amplify the noise at the same time

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  • Wave-beam forming method based on cognitive hybrid two-way relay
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Embodiment Construction

[0023] Further set forth the present invention below in conjunction with accompanying drawing:

[0024] figure 1 It is a system model diagram of the present invention. The cognitive two-way relay network includes two secondary users (Su1, Su2) and a primary user pair (Pu-tx, Pu-rx). The two cognitive users exchange information through K relay nodes, and the primary user sends The end and the receiving end, the cognitive user and the relay node are all single-antenna. f m is the channel vector from the cognitive user to the relay, f m =[f m1 , f m2 ,... f mk ] Τ , m ∈ {1,2}. h 1 , h 2 represent the uplink channel vector and downlink channel vector between the primary user and the relay terminal respectively, h m =[h m1 ,h m2 ,...h mk ] T ,m∈{1,2}.

[0025] figure 2 It is an implementation flowchart of the beamforming design method based on the cognitive hybrid two-way relay system of the present invention. The implementation of the method includes the followi...

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Abstract

The invention discloses a wave-beam forming method based on a cognitive hybrid two-way relay. The wave-beam forming method comprises the following steps that: (1) a relay node receives signals from a cognitive user Su1 and a main user in a first time slot and chooses to work in an amplifying-forwarding and decoding-forwarding mode according to the signal-to-noise ratio of the received signals; (2) the relay node receives signals from a cognitive user Su2 and the main user in a second time slot and chooses to work in an amplifying-forwarding or decoding-forwarding mode according to the signal-to-noise ratio of the received signals; (3) in a third time slot, the relay end superposes the signals obtained in the former two time slots and carries out wave-beam forming design with the target of minimizing the interference of the receiving end of the main user under the condition of meeting the requirement of the signal-to-noise ratio of the cognitive user and the constraint condition of the total transmitting power of the relay end; and (4) the non-convex optimization problem is obtained from the step (3), a semi-definite relaxation method is introduced to convert the original optimization problem into a quasi-convex optimization problem, and an interior point method is utilized for solving to obtain an optimized wave-beam forming vector. The wave-beam forming method disclosed by the invention has the advantages that the intersystem interference is reduced and the system performance can be improved.

Description

technical field [0001] The invention belongs to the field of wireless communication, and in particular relates to a beamforming method based on cognitive hybrid two-way relay. Background technique [0002] Cognitive radio is an effective technology to improve the utilization of wireless spectrum resources in recent years. In cognitive radio networks, cognitive users and primary users exist at the same time. These two types of users belong to different communication systems. Cognitive users do not affect the main When the user communicates normally, the spectrum resource is shared with the primary user. Due to the limitation of the interference power of the primary user, the transmission power of the cognitive user is limited, thereby reducing the service quality of the secondary user and the coverage of the cognitive network. In order to further improve the spectrum utilization rate, improve the service quality of cognitive users, and expand the communication range, the rel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06H04W16/14
CPCH04B7/0617H04W16/14
Inventor 刘旭贾婷婷王士欣杨龙祥朱洪波
Owner NANJING UNIV OF POSTS & TELECOMM
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