An Uplink Noise Suppression Method with Adaptive Noise Threshold in LTE Distributed Relay System

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

Active Publication Date: 2020-01-17
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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  • An Uplink Noise Suppression Method with Adaptive Noise Threshold in LTE Distributed Relay System
  • An Uplink Noise Suppression Method with Adaptive Noise Threshold in LTE Distributed Relay System
  • An Uplink Noise Suppression Method with Adaptive Noise Threshold in LTE Distributed Relay System

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Embodiment Construction

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

[0029] figure 1 It is a structural block diagram of an LTE distributed digital relay system applicable to the present invention. Such as figure 1 , the LTE distributed digital relay system usually consists of a near-end unit and multiple distributed remote units. The near-end unit is facing the base station, and the donor antenna of the near-end unit is generally installed in a position where the signal of the donor base station is better, which enables the repeater to receive a relatively stable signal source, so as to better play the performance of the repeater. The remote unit is oriented to the user end, and its hardware circuit and functions are basically similar to those of the near-end unit, and the two are connected through optical fibers or cables. There can be a flexible networking mode between the remote units and the near-end units to meet the requiremen...

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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 the 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 signal transmission, causing the signal to fail to reach some specific areas. These specific areas are called "blind areas", such as high-rise buildings, basements, tunnels, subways, In areas such as urban fringes and suburban areas, people's mobile devices in blind spots cannot achieve effective communication. For the problem of blind spots, currently in 3GPP (The 3 rd The Generation Partnership Project (3rd Generation Partnership Project) protocol LTE (Long Term Evolution, Long Term Evolution) introduces a relay technology to exte...

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Application Information

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Patent Type & Authority Patents(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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