CN103957025B

CN103957025B - Solve DCS1800 base station to the clutter interference method of Band39

Info

Publication number: CN103957025B
Application number: CN201410182171.0A
Authority: CN
Inventors: 邵广涛; 张敏; 林奔伟
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-04-30
Filing date: 2014-04-30
Publication date: 2016-03-30
Anticipated expiration: 2034-04-30
Also published as: CN103957025A

Abstract

The invention discloses and a kind ofly solve the clutter interference method of DCS1800 base station to Band39, adjustment DCS1800 Base Transmitter band leads to the technical parameter of the resonant cavity of TXBP, makes its emission bandpass TXBP be 1805MHz-1870MHz.Regulated by the emission bandpass of DCS1800 Base Transmitter band being led to the resonant cavity of TXBP, thus make in Band39(F frequency range) clutter interference effectively reduced, the power of band stray is reduced to-99.11dBm from-54.84dBm, at least more than 42dB can be effectively reduced, thus under reaching the prerequisite not increasing any inactive component, avoid DCS1800 base station to the object of the clutter interference of Band39.

Description

Solve DCS1800 base station to the clutter interference method of Band39

Technical field

The present invention relates to the communications field, particularly, relate to a kind of DCS1800 base station that solves to the clutter interference method of Band39 (F-band).

Background technology

At present, communication group company of China Mobile (hereinafter referred to as China Mobile) DCS1800 base station carrier downlink working frequency range is 1805MHz-1830MHz, but the band limits that the band of its transmitter leads to TXBP is 1805MHz-1880MHz, according to ETSI code requirement, the band stray of DCS1800 transmitter should <-36dBm, (see GSM11.21TheGSMBaseStationSystem (BSS) equipmentspecification6.6.1.3), measured by magnanimity, the spuious output in China Mobile DCS1800 base station falls into the requirement that TD-LTE/TD-SCDMABand39 (F-band) all meets ETSI specification, Fig. 1 is common measured data.

The a lot of DCS1800 base station of China Mobile is built location altogether with TD-LTE/TD-SCDMABand39 base station, astronomical cycle is on same terrace, DCS Base Transmitter follows the reception of TD-LTE/TD-SCDMABand39 base station to need certain isolation just can evade clutter interference, and interference schematic diagram as shown in Figures 2 and 3.

In Fig. 2, the isolation demand of A, B 2 is calculated as follows:

The reception noise requirements of B point: according to the requirement of TD-LTE receiver, when sensitivity decline 0.8dB, the interference level received wants <-124dBm/RB, i.e. <-121dBmRBW=100KHz;

The isolation requirement that B is 2: according to actual measurement, the spuious insulated degree requirement for-55dBm, A, B 2 that A point (DCS Base Transmitter) drops on Band39 low side (near 1880MHz) is-55dBm-(-121dBm)=66dB.

According to actual measurement, DCS1800 base station is to the isolation major part of TD-LTE/TD-SCDMABand39 (F-band) base station less than 60dB, and space isolation can not meet requirement, the uplink interference data sectional drawing that Tu4Shi TD-LTE operation maintenance center OMC backstage is read.

In Fig. 4, NI represents and makes an uproar at the bottom of receiver+disturb, and when no interference, interference threshold NI≤-117dBm, Fig. 4 interference level exceeds thresholding 30dB.

Existing conventional settling mode solves DCS1800 base station TXBP evade clutter interference to Band39 (F-band) for installing band pass filter (BPF) additional, but the shortcoming of this mode is filter belongs to passive device, add and belong to a newly-increased fault point in a network, and filter has the newly-increased Insertion Loss of about 1dB, DCS coverage is had a certain impact, has that device fault cannot be monitored, hidden danger that Purchasing Quality (carrying of material, power, Insertion Loss, intermodulation, standing-wave ratio) is difficult to control.

Summary of the invention

The object of the invention is to, for the problems referred to above, propose a kind ofly to solve the clutter interference method of DCS1800 base station to Band39, with under the prerequisite realizing not increasing any inactive component, avoid DCS1800 base station to the advantage of the clutter interference of Band39 (F-band).

For achieving the above object, the technical solution used in the present invention is:

Solve the clutter interference method of DCS1800 base station to Band39,

Adjustment DCS1800 Base Transmitter band leads to the technical parameter of the resonant cavity of TXBP, makes its emission bandpass TXBP be 1805MHz--1870MHz.

According to a preferred embodiment of the invention, the technical parameter that above-mentioned adjustment DCS1800 Base Transmitter band leads to the resonant cavity of TXBP is specially: the tuning stud logical by adjustment DCS1800 Base Transmitter band regulates emission bandpass, and uses vector network analyzer to measure parameters such as band passband rate, Insertion Loss, power suppression and return losses.

Technical scheme of the present invention has following beneficial effect:

Technical scheme of the present invention, regulated by the emission bandpass of DCS1800 Base Transmitter band being led to the resonant cavity of TXBP, thus make effectively to be reduced in the clutter interference of Band39 (F-band), the power of band stray is reduced to-99.11dBm from-54.84dBm, at least more than 42dB can be effectively reduced, thus under reaching the prerequisite not increasing any inactive component, avoid DCS1800 base station to the object of the clutter interference of Band39.

Below by drawings and Examples, technical scheme of the present invention is described in further detail.

Accompanying drawing explanation

Fig. 1 is the band stray actual measurement schematic diagram of DCS1800 base station TXBP;

Fig. 2 and Fig. 3 is the clutter interference schematic diagram of DCS1800 base station to Band39;

Fig. 4 is the NI statistical chart of the LTE community by DCS1800 base station clutter interference;

Fig. 5 is band stray power diagram after adjustment DCS1800 base station TXBP;

Fig. 6 is the structural representation that DCS1800 Base Transmitter band leads to TXBP;

Fig. 7 is DCS1800 base station TXBP vector network analyzer survey map before adjustment;

Fig. 8 is vector network analyzer survey map after commissioning DCS1800 base station TXBP completes;

Fig. 9 is for adjusting the front clutter interference design sketch to Band39 (F-band) of DCS1800 base station TXBP;

Figure 10 is the clutter interference design sketch to Band39 (F-band) after tune DCS1800 base station TXBP.

By reference to the accompanying drawings, in the embodiment of the present invention, Reference numeral is as follows:

The tuning stud of 1-; 2-hold-down nut; 3-emission bandpass TXBP.

Embodiment

Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.

Solve the clutter interference method of DCS1800 base station to Band39,

Adjustment DCS1800 Base Transmitter band leads to the technical parameter of the resonant cavity of TXBP, makes its emission bandpass be 1805MHz--1870MHz, and comprises endpoints thereof.

Wherein, the technical parameter that adjustment DCS1800 Base Transmitter band leads to the resonant cavity of TXBP is specially: regulated emission bandpass by the tuning stud of adjustment DCS1800 emission bandpass TXBP, and uses vector network analyzer to enter to measure to parameters such as band passband rate frequency, Insertion Loss, power suppression and return losses.

Table one, GSM base station system TX/RX emission bandpass parameter list:

	TX：	RX：
			P-GSM900	935MHz to 960 MHz	890 MHz to 915 MHz
DCS1800	1805 MHz to 1880 MHz	1710 MHz to 1785 MHz
			E-GSM920	925 MHz to 960 MHz	880 MHz to 915 MHz
T-GSM900	921 MHz to 960 MHz	876 MHz to 915 MHz
			GSM450	460，4 MHz to 467，6 MHz	450，4 MHz to 457，6 MHz
GSM480	480，8 MHz to 496 MH	478.8 MHz to 486 MHz
			GSM850 and MXM 850	869 MHz to 894 MHz	824 MHz to 849 MHz
PCS 1900 and MXM 1900	1930 MHz to 1990 MHz	1850 MHz to 1910 MHz

GSM base station system TX/RX emission bandpass parameter rule as shown in Table 1, by the technical parameter of the resonant cavity of DCS1800 base station TXBP in adjustment existing network, on the basis not affecting current the used mobile GSM transmit frequency band (1805MHz-1830MHz) of China Mobile, evade the clutter interference to Band39 (F-band);

Advantage does not increase any inactive component in China Mobile's existing network, and the TXBP of the DCS1800 base station of just adjustment existing network use reaches the feature of the clutter interference of evading Band39 (F-band).

It is effectively reduced in the clutter interference of Band39 (F-band),-the 54.84dBm that the power of band stray shows from figure tetra-is reduced to-99.11dBm, at least more than 42dB can be effectively reduced, meet the requirement that China Mobile is spuious to Band39 (F-band) completely, the stray power after adjustment as shown in Figure 5;

Commissioning process, actual commissioning requirements uses vector network analyzer (VSA), and by the tuning stud in rotation diagram 6, amount to 25 tuning studs, reach required technical indicator, DCS1800 emission bandpass TXBP sketch as shown in Figure 6.

Table two, adjustment DCS1800 Base Transmitter band lead to the technical parameter requirement table of the resonant cavity of TXBP:

Before adjustment, the band passband section that namely in current China Mobile existing network, the TXBP of DCS base station is descending is shown in shown in a curve Tr2 in Fig. 7, and band leads to for 1805-1880MHz (frequency marking △ 3 and △ 6 see Fig. 7)

After adjustment, the descending band passband section of the TXBP of DCS base station to be shown in Fig. 8 shown in a curve Tr2, be with to lead to by original 1805-1880MHz and adjust to 1805-1870MHz (see frequency marking △ 3 and △ 4), the 1880MHz frequency useless and harmful to Band39F frequency range to DCS1800 suppresses to reach-42.672dB (see frequency marking △ 6), simultaneously, can support that 1850-1870MHz is total to the high-end frequency range of 20M, not affect the use of DCS1800 (1850MHz--1870MHz) high-end frequency range.

Can find out from Fig. 9 and Figure 10, TXBP is led to by adjusting DCS1800 Base Transmitter band, effectively can reduce the impact on Band39 (F-band 1880MHz--1900MHz) clutter interference, make all to be reduced to below-116dBm at Band39 (F-band 1880MHz--1900MHz) clutter interference power.

Adjust DCS1800 emission bandpass TXBP to evade to add the contrast of spuious filter to the clutter interference of Band39 (F-band) and tradition and have the following advantages, as shown in Table 3,

Table three: adjust DCS1800 emission bandpass TXBP to add spuious filter contrast table to the clutter interference of Band39 (F-band) and tradition:

By adjustment DCS1800 emission bandpass TXBP (have original 1805-1880MHz band to lead to and adjust to 1805-1870MHz); increasing the Out-of-band rejection to Band39 (F-band 1880MHz--1900MHz), is the protection range all being belonged to the technical program by the emission bandpass of adjustment DCS1800TXBP to implementing evading of Band39 (F-band 1880MHz--1900MHz) spuious scheme.

Last it is noted that the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although with reference to previous embodiment to invention has been detailed description, for a person skilled in the art, it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. solve the clutter interference method of DCS1800 base station to Band39,

Adjustment DCS1800 Base Transmitter band leads to the technical parameter of the resonant cavity of TXBP, makes its emission bandpass TXBP be 1805MHz--1870MHz;

It is characterized in that, the technical parameter that above-mentioned adjustment DCS1800 Base Transmitter band leads to the resonant cavity of TXBP is specially: the tuning stud being led to TXBP by adjustment DCS1800 Base Transmitter band is regulated emission bandpass, and uses vector network analyzer to measure band passband rate, Insertion Loss, power suppression and return wave loss parameter; Tuning stud is 25.