Collaboration partner selection and pre-coding collaboration communication method in cellular communication system

A technology of cellular communication system and cooperative communication, which is applied in the field of cooperative partner selection and precoding cooperative communication, and can solve the problems of configuring multiple antennas without considering the base station, limiting the transmission rate of the system, and limiting the performance of the system.

Inactive Publication Date: 2009-04-01
XIDIAN UNIV
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Problems solved by technology

But its shortcomings are: compared with coherent detection, there is a 3dB performance loss, which limits the further improvement of system transmission performance; users can only use binary phase shift keying modulation, which limits the further improvement of system transmission rate; only research The case where the base station is configured with a single antenna
However, its shortcomings are: users can only use one-dimensional constellation modulation, which limits the improvement of system performance; does not

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  • Collaboration partner selection and pre-coding collaboration communication method in cellular communication system
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  • Collaboration partner selection and pre-coding collaboration communication method in cellular communication system

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[0043] The present invention will be further described below with reference to the accompanying drawings and in conjunction with the embodiments.

[0044] refer to figure 1 , the concrete steps of the present invention are as follows:

[0045] Step 1: The user terminal whose uplink channel signal-to-noise ratio is lower than the preset threshold sends a coordinated communication request to the base station BS.

[0046] In the cellular communication system, the base station BS can measure the uplink channel quality of each user within its coverage area, and feed back to the user terminal through the control channel. Since the business requirements of each user terminal are different, a threshold γ can be preset according to the frame error rate, or symbol error rate, or bit error rate, or the signal-to-noise ratio γ required by the outage probability performance T , usually γ T ≥γ, and the uplink signal-to-noise ratio γ Ad Below preset threshold¶ T Any user of is the first...

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Abstract

The invention discloses a method for cooperation partner selection and precoding cooperative communications in a cellular communication system. The method comprises the following steps: (1) a user terminal with bad uplink channel quality sends a cooperative communication request to a base station; (2) the base station selects a partner terminal for the user terminal; (3) in a first frame of a cooperation period, the user terminal sends local data to the base station, and the base station and the partner terminal receive the data simultaneously; (4) in a second frame of the cooperation period, the partner terminal sends the local data to the base station, and the base station and the user terminal receive the data simultaneously; (5) in a third frame of the cooperation period, the user terminal and the partner terminal preprocess the relay data by a precoding matrix which is fed back by the base station, and send the relay data to the base station simultaneously; and (6) the base station judges the signals received in the transmission time slots of different frames in a combination way to obtain an estimated value of the sent signal. The method has the advantages of low complexity and high utilization rate of the system resources, and is used for the reliable data transmission in the cellular communication system.

Description

technical field [0001] The invention belongs to the field of wireless communication, in particular to a cooperative partner selection and precoding cooperative communication method in a cellular communication system. Background technique [0002] Because the wireless channel will be affected by factors such as shadow fading, multipath fading, and interference, the transmitted signal will experience serious attenuation and fluctuation when transmitted in the channel. A large number of studies have shown that multi-antenna diversity technology can effectively resist the influence of multipath fading in wireless networks, increase network capacity, and improve system performance. However, in practical cellular communication networks, user terminals need to remain relatively simple and portable. Due to the limitations of size, power and implementation complexity, the feasibility of implementing multiple antennas in user terminals is very low. [0003] Future cellular communica...

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Application Information

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IPC IPC(8): H04B7/02H04B7/06H04B7/08H04W48/20H04W88/02
Inventor 李靖葛建华王勇宫丰奎高明张南
Owner XIDIAN UNIV
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