Upstream noise inhibiting method automatically adapting to noise thresholds in LTE-distributed relay system

A distributed relay and noise threshold technology, applied in baseband system components, advanced technology, line failure/interference reduction, etc., can solve the problems of base station noise floor increase, achieve accurate suppression, avoid unreasonable settings, and improve uplink Effect of Receive Sensitivity

Active Publication Date: 2017-05-17
SOUTHEAST UNIV
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Problems solved by technology

[0006] Purpose of the invention: Aiming at the above-mentioned prior art, a filter bank-based uplink noise suppression method is proposed, which is applicable to LTE communication systems and is used to solve the problem of base station noise floor elevation in LTE digital relay systems in the prior art

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  • Upstream noise inhibiting method automatically adapting to noise thresholds in LTE-distributed relay system

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[0028] The present invention will be further explained below in conjunction with the drawings.

[0029] figure 1 It is a structural block diagram of an LTE distributed digital relay system to which the present invention is applicable. Such as figure 1 , LTE distributed digital relay system is usually composed of a near-end unit and multiple distributed remote units. The near-end unit faces the base station, and the donor antenna of the near-end unit is generally installed at a position where the donor base station has a better signal. This allows the repeater to receive a more stable signal source, thereby better performing the relay performance. The remote unit is user-oriented, and its hardware circuits and functions are basically similar to those of the near-end unit, and they are connected by optical fibers or cables. There can be flexible networking modes between the remote units and the near-end units to meet the requirements of the communication system.

[0030] figure ...

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Abstract

The invention discloses an upstream noise inhibiting method automatically adapting to noise thresholds in an LTE-distributed relay system. The method comprises the steps of adding a base noise inhibiting module in a baseband digital signal processing unit of a remote unit in the direction of an uplink, getting a sub-band digital signal of each resource block after received an LTE upstream digital baseband signal passes an analysis filter bank, calculating power values of each digital signal in each resource block and a power value of current base noise, and getting an opening threshold and a closing threshold of noise after an automatically adapted noise threshold updates current noise threshold value. Then, calculated digital signal power in each resource block is compared with the noise thresholds in a judgment unit, after which, sub-band signals with low power are set to zero according to a corresponding comparison and judgment method to inhibit the base noise. After noise is inhibited, each sub-band signal in each resource block gets a restructured LTE digital baseline signal through a synthesis filter bank.

Description

Technical field [0001] The invention relates to an optimization of noise threshold setting in an uplink noise suppression method based on a filter bank, which is applied in an LTE distributed digital relay communication system and belongs to the field of wireless communication. Background technique [0002] Due to the transmission characteristics of wireless signals and the limitations of various terrains, the signal continues to weaken during the signal transmission process, causing the signal to fail to reach some specific areas. These specific areas are called "blind areas", such as high-rises, basements, tunnels, subways, etc. In areas such as urban fringe and suburban areas, people’s mobile devices in blind areas cannot achieve effective communication. Aiming at the problem of blind spots, currently in 3GPP (The 3 rd The Generation Partnership Project, the third-generation partnership project) protocol LTE (Long Term Evolution, Long Term Evolution) introduces the relay tech...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/08H04W24/02H04W24/08H04W88/04
CPCH04L25/08H04W24/02H04W24/08H04W88/04Y02D30/70
Inventor 张华强勇
Owner SOUTHEAST UNIV
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