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Signal-to-noise ratio measuring method based on array antennas mobile communication system

A mobile communication system and array antenna technology, applied in the field of signal-to-noise ratio measurement, can solve problems such as biased estimation, improve performance and avoid signal-to-noise ratio estimation errors

Inactive Publication Date: 2003-10-15
ALCATEL LUCENT SHANGHAI BELL CO LTD
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Problems solved by technology

[0007] The object of the present invention is to provide a SNR measurement method for an array antenna mobile communication system, which solves the biased estimation problem of traditional SNR measurement, and accurately measures the ratio between the signal power and noise power of a certain user. Ratio, so as to effectively control the power and improve the performance of the system

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  • Signal-to-noise ratio measuring method based on array antennas mobile communication system
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  • Signal-to-noise ratio measuring method based on array antennas mobile communication system

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Embodiment Construction

[0014] see image 3 , the present invention, namely a kind of signal-to-noise ratio measurement method based on the array antenna mobile communication system, comprises the following steps:

[0015] Step 301: In a certain period of time, a user's initial transmit power in a certain cell is obtained through open-loop power control in the array antenna mobile communication system to obtain the user's initial transmit power. Users should use open-loop power control to compensate path loss at regular intervals, and then use closed-loop power control to fine-tune compensation for fading.

[0016] Step 302: Generate TPC_cmd according to the power control command word TPC fed back in step 309, so as to adjust the transmit power of the user to P i =P i-1 +Δ adjusted , where Δ adjusted =Δ TPC ×TPC_cmd,P i ,P i-1 are the transmission powers of frame i (or subframe, time slot) and frame i-1 respectively, Δ TPC Adjust the step size for power, determined by the system.

[0017] TP...

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Abstract

46. A measurement method of signal / noise ratio based on an array antenna mobile communication system: customer initial transmitted power, and get the customer initial transmitted power; control and valuate results by the fed-back power, and adjust the customer transmitted power, get the customer transmitted power of the frame; the transmitted power of the frame passing a radio transmission channel, antennas in a base station receive the customer signals, and convert them into baseband digital signals; estimate the customer channel, get the estimated values after the customer experiences the channel impulse response; based on the estimated values of the customer channel impulse response in each array element, estimate the covariance matrix; decompose eigenvalues, get the eigenvalues and eigenvectors of the customer, determine the average noise power and the signal power of the customer, measure the signal / noise ratio; compare the measured signal / noise ratio with the goal signal / noise ratio, get results about the controlled transmitted power, and feedback.

Description

1. Technical field [0001] The invention relates to a method for measuring signal-to-noise ratio based on an array antenna mobile communication system. 2. Background technology [0002] In the mobile communication CDMA (Code Division Multiple Access) system, since the power control and handover need SNR parameters, the SNR measurement must be carried out in the system. [0003] In a mobile communication system, in order to better reduce the impact of interference and noise on user performance and increase additional gain, an array antenna system is usually used. Such as figure 1 As shown, a general array antenna system includes: an array antenna array 101 , a radio frequency signal processing module 102 , and a baseband signal processing module 103 . Wherein, the array antenna array 101 is made up of a plurality of 001 antenna units, and there are two types of array antenna shapes, that is, a circular array suitable for omnidirectional cells and a linear array suitable for ...

Claims

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Application Information

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IPC IPC(8): H04W52/10H04B17/336
Inventor 王敬人曹鹏志李春旭巴勇
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD
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