CN104467971A - Repeater uplink noise analyzing method and remote terminal deployment method - Google Patents
Repeater uplink noise analyzing method and remote terminal deployment method Download PDFInfo
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- CN104467971A CN104467971A CN201410788055.3A CN201410788055A CN104467971A CN 104467971 A CN104467971 A CN 104467971A CN 201410788055 A CN201410788055 A CN 201410788055A CN 104467971 A CN104467971 A CN 104467971A
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Abstract
The invention discloses a repeater uplink noise calculating method and a remote terminal deployment method. The calculating method comprises the steps that various factors influencing the sensitivity of a repeater are determined according to the noise coefficient of an optical module in the repeater and the relation between the gain of a remote terminal and the noise coefficient; the uplink noise of the repeater is calculated according to the determined various factors, wherein the noise coefficient of the optical module in the repeater is the sum of the noise coefficient of an optical module of a near terminal and the noise coefficient of an optical module in the remote terminal. The noise calculating method applied under the actual condition is provided by specifically analyzing all parts of the repeater. According to the noise calculating method, the noise is low, more remote terminals can have access to the repeater, the sensitivity of the repeater is improved, and the signal cover of the repeater is greatly enlarged.
Description
Technical field
Signal transmission technology field of the present invention, particularly relates to the analytical method of the upstream noise of repeater and the concocting method of remote termination.
Background technology
From the composition of hardware, optic-fiber repeater system forms primarily of near-end machine, optical cable, remote termination and leaky cable (or antenna).Each near-end machine is connected on base station by feeder line and coupler, and near-end machine optical fiber is connected on remote termination.Several part is the necessary critical component of optical fiber repeater above.Because repeater will inevitably produce noise, but existing noise calculation method is the noise factor of the up gain+remote termination of the loss+repeater of noise=thermal noise+between repeater and base station, this noise calculation method is unactual, do not consider the concrete condition of each several part in repeater, cause the upstream noise that calculates excessive, the quantity of the remote termination that repeater is accessed is restricted.
Summary of the invention
An object of the present invention is to provide a kind of analytical method of upstream noise of repeater, adopts noise calculation method in prior art, cause repeater can only access the problem of small-scale remote termination to solve.
In some illustrative embodiment, the analytical method of described a kind of direct end uplink noise, comprise: according to the noise factor of the optical module in repeater, and the gain of remote termination and the magnitude relationship of noise factor, determine the many factors of the sensitivity affecting described repeater; According to the described many factors determined, calculate the upstream noise of described repeater; Wherein, the noise factor of the optical module in described repeater is the noise factor of near-end machine optical module and the noise factor sum of described remote termination optical module.
Another object of the present invention is the concocting method of the remote termination providing a kind of repeater.
In some illustrative embodiment, the concocting method of the remote termination of described repeater, comprise: when the gain of the remote termination of repeater and noise factor are greater than or less than the noise factor of the optical module of described repeater respectively, the computational methods described in any one of claim 1-6 are adopted to calculate the upstream noise of described repeater, according to the difference between the described upstream noise calculated and the maximum noise of described repeater, regulate the access quantity of described remote termination, this access quantity is at most 16.
Compared with prior art, illustrative embodiment of the present invention comprises following advantage:
By making a concrete analysis of each several part of repeater, propose a kind of noise calculation method be applied under actual conditions, the noise that these computational methods calculate is little, makes repeater can access more remote termination, improve the sensitivity of repeater, greatly increase the signal cover of repeater.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram of noise effect factor in prior art;
Fig. 2 is the schematic diagram according to noise effect factor in illustrative embodiment of the present invention;
Fig. 3 is the flow chart according to illustrative embodiment of the present invention.
Embodiment
In the following detailed description, a large amount of specific detail is proposed, so that provide thorough understanding of the present invention.But, person of skill in the art will appreciate that, also can implement the present invention even without these specific detail.In other cases, do not describe well-known method, process, assembly and circuit in detail, in order to avoid affect the understanding of the present invention.
For the ease of understanding the present invention faster, below prior art and main thought of the present invention are simply set forth:
As shown in Figure 1, traditional noise calculation is thought, the factor affecting noise is thermal noise-121dBm/200kHz, the loss Lp between repeater and base station, the up gain G of repeater, remote termination noise factor Nfru.
Computing formula is:
Up gain (the G)+remote termination noise factor (Nfru) of loss (the Lp)+repeater of noise=thermal noise (-121dBm/200kHz)-between repeater and base station.
As shown in Figure 2, the present invention finds that noise changes with the change of direct discharging station;
If the noise factor NFru of the gain G ru of remote termination and remote termination has exceeded the noise factor NFfo of optical module, then the factor mainly thermal noise-121dBm/200kHz of the sensitivity of influential system, the gain G lna of LNA and and remote termination noise factor NFru.Noise calculation formula is now:
Gain (the Glna)+remote termination noise factor (NFru) of noise=thermal noise (-121dBm/200kHz)+LNA.
If the noise factor NFru of the gain G ru of remote termination and remote termination is lower than the noise factor NFfo of optical module, the then factor of the sensitivity of influential system mainly thermal noise-121dBm/200kHz, the noise NFfo of optical module and the gain G ru of whole remote termination system.Noise calculation formula is now:
The gain G ru of the whole remote termination system of noise NFfo+ of noise=thermal noise-121dBm/200kHz+ optical module.
As shown in Figure 3, disclose a kind of analytical method of direct end uplink noise, comprising:
S11, noise factor according to the optical module in repeater, and the gain of remote termination and the magnitude relationship of noise factor, determine the many factors of the sensitivity affecting described repeater;
S12, according to the described many factors determined, calculate the upstream noise of described repeater;
Wherein, the noise factor of the optical module in described repeater is the noise factor of near-end machine optical module and the noise factor sum of described remote termination optical module.
By making a concrete analysis of each several part of repeater, propose a kind of noise calculation method be applied under actual conditions, the noise that these computational methods calculate is little, makes repeater can access more remote termination, improve the sensitivity of repeater, greatly increase the signal cover of repeater.
In some illustrative embodiment, if the gain of described remote termination and noise factor sum are greater than the noise factor of described optical module, in the described many factors determined, at least comprise following factor:
The gain of the low noise amplifier of described thermal noise, described remote termination and the noise factor of described remote termination.
In some illustrative embodiment, if the gain of described remote termination and noise factor sum are less than the noise factor of described optical module, in the described many factors determined, at least comprise following factor:
The noise factor of described thermal noise, described optical module and the gain of described remote termination.
In some illustrative embodiment, the quantity of described remote termination is at least one, and its selection range is between 1-16.
In some illustrative embodiment, the gain of described remote termination is the gain of the remote termination system be made up of multiple described remote termination.
In some illustrative embodiment, if the quantity of described remote termination is increased to one times of the quantity of current remote termination, then the upstream noise of described repeater increases 3dBm.
In some illustrative embodiment, the described described many factors according to determining, calculates the upstream noise of described repeater, specifically comprises: described upstream noise is described many factors sum.
In some illustrative embodiment, disclose a kind of concocting method of remote termination access quantity of repeater, comprising:
When the gain of the remote termination of repeater and noise factor sum are greater than or less than the noise factor of the optical module of described repeater, above-mentioned analytical method is adopted to calculate the upstream noise of described repeater, according to the difference between the described upstream noise calculated and the maximum noise of described repeater, regulate the access quantity of described remote termination, this access quantity is at most 16.
In other situations, control described repeater to multiple access 4 remote terminations.
In some illustrative embodiment, the upstream noise calculated by described analytical method meets following condition:
If the quantity of described remote termination is increased to one times of the quantity of current remote termination, then described upstream noise increases 3 (dBm).
In addition, above-mentioned two kinds of account forms all do not mention the gain G fo of optical module.Due to general optical module Gfo=0dBm, therefore, not mentioned in computing formula, but in conventional coupling arrangement, Gfo cannot be left in the basket.Because in actual applications, in the middle of remote termination optical module and near-end machine optical module with a very long Fiber connection.The longest optical fiber installed at the scene can reach 2Km, means that the loss of optical fiber is about 6dBm.If optical module does not have automatic gain compensation function, be with automatic gain compensation in other words but circuit design is perfect not, all can have changed the noise factor NFfo of optical module and the gain G fo of optical module, cause system noise to be elevated, sensitivity declines.
The explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (8)
1. an analytical method for direct end uplink noise, is characterized in that, comprising:
According to the noise factor of the optical module in repeater, and the gain of remote termination and the magnitude relationship of noise factor, determine the many factors of the sensitivity affecting described repeater;
According to the described many factors determined, calculate the upstream noise of described repeater;
Wherein, the noise factor of the optical module in described repeater is the noise factor of near-end machine optical module and the noise factor sum of described remote termination optical module.
2. analytical method according to claim 1, is characterized in that,
If the gain of described remote termination and noise factor sum are greater than the noise factor of described optical module, in the described many factors determined, at least comprise following factor:
The gain of the low noise amplifier of thermal noise, described remote termination and the noise factor of described remote termination.
3. analytical method according to claim 1, is characterized in that,
If the gain of described remote termination and noise factor sum are less than the noise factor of described optical module, in the described many factors determined, at least comprise following factor:
The noise factor of described thermal noise, described optical module and the gain of described remote termination.
4. analytical method according to claim 3, is characterized in that, the quantity of described remote termination is at least one;
The gain of described remote termination is the gain of the remote termination system be made up of multiple described remote termination.
5. the analytical method according to any one of claim 1-4, is characterized in that, the described described many factors according to determining, calculates the upstream noise of described repeater, specifically comprise:
Described upstream noise is described many factors sum.
6. a concocting method for the remote termination access quantity of repeater, is characterized in that, comprising:
When the gain of the remote termination of repeater and noise factor are greater than or less than the noise factor of the optical module of described repeater respectively, the analytical method described in any one of claim 1-5 is adopted to calculate the upstream noise of described repeater, according to the difference between the described upstream noise calculated and the maximum noise of described repeater, regulate the access quantity of described remote termination, this access quantity is at most 16.
7. concocting method according to claim 6, is characterized in that, in other situations, controls described repeater to multiple access 4 remote terminations.
8. concocting method according to claim 6, is characterized in that, the upstream noise calculated by described analytical method meets following condition:
If the quantity of described remote termination is increased to one times of the quantity of current remote termination, then described upstream noise increases 3 (dBm).
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