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Multi-antenna precoding method

A multi-antenna, precoding technology, applied in diversity/multi-antenna system, advanced technology, digital transmission system, etc., can solve the problem of not considering spectral efficiency or reliability optimization, etc., to improve system channel capacity, improve spectral efficiency, Reduce the effect of debugging work

Active Publication Date: 2014-02-26
JIANGSU SUPERVISION & INSPECTION INST FOR PROD QUALITY
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Problems solved by technology

However, these only give SAR measurements or methods to reduce SAR based on antenna design, and do not consider the spectral efficiency or reliability optimization problems under SAR constraints

Method used

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Embodiment Construction

[0037] Such as figure 1 As shown, the present invention is preferably applied in the uplink of a multi-antenna device, with N transmitting antennas on the device side and M receiving antennas on the base station side. In a preferred embodiment it is assumed that N=2, M=2. However, other numbers of antennas are possible in other embodiments. The channel obeys the zero-mean cyclic symmetric complex Gaussian channel model, and the received signal y∈C of the base station M×1 Expressed as:

[0038] y=hfx+z (6)

[0039] Among them, x is the transmission symbol, obeying the complex random distribution with mean value 0 and variance 1, satisfying E[||x|| 2 ]=1. h∈C M×N is the channel gain matrix, f∈C N×1 is the precoding vector, z is the additive white Gaussian noise, the mean value is 0, and the variance is ε 2 complex Gaussian distribution. Assuming that the transmission power of the device is limited to P, then

[0040] ||f|| 2 ≤ P (7)

[0041] At this time, the channel...

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Abstract

The invention provides a multi-antenna precoding method. Firstly, a first optimal precoding vector is calculated based on the calculation of the maximum transmission power of equipment. Secondly, the current specific absorption rate value of the multi-antenna equipment is calculated. Thirdly, a problem that whether the current specific absorption rate exceeds the specified limit value or not is judged, if the current specific absorption rate exceeds the specified limit value, the calculated first optimal precoding vector is determined as a final precoding vector, otherwise, based on a power normalized optimal precoding vector and the specific absorption rate limit value, the maximum allowable transmission power based on specific absorption rate limit is calculated, a second optimal precoding vector is calculated according to the maximum allowable transmission power, and the second optimal precoding vector is determined as a final precoding vector. According to the method, under the premise of satisfying SAR constraints, the spectrum efficiency and reliability of the multi-antenna equipment can be raised.

Description

technical field [0001] The present invention relates to a multi-antenna precoding method, in particular to a multi-antenna precoding method based on specific absorption rate constraints. Background technique [0002] With the development of wireless communication technology, people are increasingly exposed to electromagnetic fields of various frequencies and strengths. Electromagnetic radiation has become a new type of special environmental pollution, especially the impact of electromagnetic radiation from mobile phones on human health has aroused great concern. When this type of equipment is used close to the face or body of a person, when the electromagnetic radiation power absorbed by the human body exceeds a certain limit, it will have adverse effects. [0003] At present, many countries and scientific research organizations generally use the specific absorption rate (SAR) to evaluate the impact of electromagnetic radiation on the human body. SAR is defined as the elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/06H04B7/04
CPCY02D30/70
Inventor 梁学俊吴震水利民
Owner JIANGSU SUPERVISION & INSPECTION INST FOR PROD QUALITY
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