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D2D (Device-to-Device) cooperative transmission method under rician fading channel condition

A fading channel, cooperative transmission technology, applied in transmission systems, radio transmission systems, electrical components, etc., can solve problems such as quantization errors between system channel information and real channel information, performance degradation of adaptive transmission schemes, and incomplete matching.

Active Publication Date: 2017-08-18
SOUTHEAST UNIV
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Problems solved by technology

This scheme will lead to a certain quantization error between the system channel information obtained by the base station and the real channel information, and the size of this quantization error is determined by the capacity of the feedback link
In addition, when the feedback mechanism is used, there is also the problem of information delay caused by the feedback link, that is, the feedback information obtained by the base station is not the channel information at the current moment, but the channel information before a certain delay
[0007] Under the influence of the above factors, the downlink information obtained by the base station does not completely match the real channel information, resulting in a significant decline in the performance of the adaptive transmission scheme based on ideal channel information

Method used

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  • D2D (Device-to-Device) cooperative transmission method under rician fading channel condition
  • D2D (Device-to-Device) cooperative transmission method under rician fading channel condition
  • D2D (Device-to-Device) cooperative transmission method under rician fading channel condition

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Embodiment

[0163] In order to unify the comparison benchmark, the noise variance is normalized, and the base station transmission power P b , in the following illustrations, it is assumed that the reference distance d 0 =100m, signal propagation path loss attenuation factor l=3.5.

[0164] In the maximum rate precoding mode, the total achievable transmission rate of the system after the introduction of D2D communication and the cell user US 0 and D2D user D 1 The respective achievable transmission rates, and their changes with the signal-to-noise ratio are as follows figure 2 shown. Depend on figure 2 It can be seen that:

[0165] In MR mode, by D2D user D 1 It can be seen from the curve that adopts the curve that the method speed theory result of the present invention changes with the signal-to-noise ratio and adopts the curve that the numerical simulation rate value changes with the signal-to-noise ratio, adopts the method theoretical calculation result of the present invention...

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Abstract

The invention discloses a D2D (Device-to-Device) cooperative transmission method under a rician fading channel condition. The method comprises the following steps of (1), scheduling cell users and D2D users participating in cooperative transmission; (2), estimating Doppler frequency offset of the cell user US <0> and a D2D link receiving end user D <1 > and obtaining a channel time delay correlation coefficient; (3), estimating performance gains obtained in two transmission modes and determining to adopt a cooperative transmission mode by a base station; (4), estimating own channel information by the user, quantizing the information and feeding back the information to the base station; and (5), transmitting data under a precoding scheme of the selected mode. According to the cooperative transmission method provided by the invention, a reachable rate is fitted with statistical properties of a real system well; through utilization of a closed expression, before the system feeds back the channel information actually, the base station is assisted in carrying out judgment rapidly and effectively; the user only feeds back necessary channel state information to the base station according to a cooperative demand; and transmission loads of a feedback link are reduced.

Description

technical field [0001] The present invention relates to a cooperative transmission method in a mobile communication multiple-input multiple-output (MIMO) system, in particular to a D2D cooperative transmission method under Ricean fading channel conditions. Background technique [0002] In the cellular mobile communication system, some users face the difficulty that the useful signal power is low and the interference signal power is high, and the high data transmission rate cannot be obtained effectively. ) to establish a direct communication link to effectively increase the user's data rate. [0003] In the existing cellular mobile communication environment, this D2D technology enables users located at the cell edge to directly establish links with adjacent terminals for data transmission by sharing the frequency resources of other users in the cell. Since the distance between the two users of D2D communication is very close, a relatively small transmission power can be use...

Claims

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Application Information

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IPC IPC(8): H04B7/0413H04B7/0417H04B7/0456H04W4/00H04W72/12
CPCH04B7/0413H04B7/0417H04B7/0456H04W4/70H04W72/1215H04W72/1263H04W72/54
Inventor 史锋峰
Owner SOUTHEAST UNIV
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