CN202535551U

CN202535551U - Access point device

Info

Publication number: CN202535551U
Application number: CN2012201923674U
Authority: CN
Inventors: 刘猛
Original assignee: Hangzhou H3C Technologies Co Ltd
Current assignee: New H3C Technologies Co Ltd
Priority date: 2012-05-02
Filing date: 2012-05-02
Publication date: 2012-11-14
Anticipated expiration: 2022-05-02

Abstract

An access point device comprises an antenna, a preposed receiving circuit and a baseband processing chip which are orderly connected in series. The access point device is characterized in that the access point device further comprises the following components of: an anti-interference circuit which is connected in series between the preposed receiving circuit and the baseband processing chip of the access point device; a down-conversion circuit which performs down-conversion processing on a first signal outputted by the preposed receiving circuit and outputs a second signal whose frequency is lower than that of the first signal; an interference suppression filter which performs filtering processing on the second signal and outputs a third signal obtained through filtering; and an up-conversion circuit which performs up-conversion processing on the third signal and outputs a fourth signal whose frequency is equal to that of the first signal to the baseband processing chip.

Description

Access point apparatus

Technical field

The utility model relates to the signal Anti-Jamming Technique, particularly is applicable to WLAN (Wireless Local Area Network, WLAN) a kind of access point (Access Point, AP) equipment.

Background technology

The operating frequency of WLAN is usually between 2.4GHz to 2.5GHz, and is very approaching with the operating frequency of wireless communication system, especially TD-LTE systems such as 3G.Therefore, when the AP of WLAN equipment during very near the signal source of wireless communication systems such as 3G, the signal that the signal that AP equipment receives will receive wireless communication systems such as 3G disturbs, and this just makes the antijamming capability of AP equipment seem particularly important.

Fig. 1 is the structural representation of existing a kind of AP equipment.As shown in Figure 1; AP equipment 100 has antenna 11, preposition receiving circuit 12 and the baseband processing chip 13 of order series connection; And; In order to improve antijamming capability, this AP equipment 100 also further is in series with a cavity body filter 10 that squareness factor is very high between antenna 11 and preposition receiving circuit.Like this; After the antenna 11 of AP equipment 100 receives signal; Because cavity body filter 10 can cover the high band at this signal place, therefore, cavity body filter 10 can carry out Filtering Processing so that the interference in this signal can be suppressed to this signal earlier; Then, undertaken being passed to baseband processing chip 13 again after low noise is amplified by the signal after 12 pairs of Filtering Processing of preposition receiving circuit.

Though above-mentioned mode as shown in Figure 1 can improve the antijamming capability of AP equipment 100, this mode depends on the bigger cavity body filter of volume 10, thereby will cause the volume of AP equipment 100 also to increase thereupon.

The utility model content

In view of this, the utility model provides a kind of AP equipment.

A kind of AP equipment that the utility model provides; The antenna, preposition receiving circuit and the baseband processing chip that comprise the order series connection; Also comprise anti-jamming circuit, said anti-jamming circuit is connected between preposition receiving circuit and the baseband processing chip of said access point apparatus and comprises:

Lower frequency changer circuit carries out the secondary signal that down-converted and output frequency are lower than said first signal to first signal of said preposition receiving circuit output;

Interference suppression filter carries out Filtering Processing and exports the 3rd signal that filtering obtains said secondary signal;

Up-converter circuit carries out upconversion process and equals the 4th signal of said first signal to said baseband processing chip output frequency said the 3rd signal.

Preferably, the squareness factor of said interference suppression filter is in 1～3 scope, and said squareness factor is the ratio of 60DB bandwidth and 3DB bandwidth.

More preferably, said interference suppression filter is a SAW filter.

Preferably, said lower frequency changer circuit and said up-converter circuit are one.

Preferably, be in series with a plurality of said lower frequency changer circuits between said preposition receiving circuit and the said interference suppression filter, between said interference suppression filter and said baseband processing chip, be in series with a plurality of said up-converter circuits.

More preferably, the quantity of a plurality of said lower frequency changer circuits is identical with the quantity of a plurality of said up-converter circuits; And a plurality of said lower frequency changer circuit that quantity is identical and the frequency conversion multiple of a plurality of said up-converter circuits are symmetrical set.

Preferably; Said preposition receiving circuit comprises that order is connected on prefilter and the low noise amplifier between said antenna and the said lower frequency changer circuit; Wherein, the filter factor of said prefilter makes the power of said primary signal can be adjusted in the power bracket of said low noise amplifier and the power of said first signal can be adjusted in the power bracket of said lower frequency changer circuit.

More preferably, said preposition receiving circuit further comprises the RF switch that is connected between said antenna and the said prefilter.

As above visible; The utility model can be reduced to lower frequency with the signal that AP equipment receives to carry out filtering and after filtering, again signal is reverted to original frequency; Thereby with regard to allowing anti-jamming circuit in the AP equipment for example to select for use SAW filter etc. is difficult to cover high band but the less other types filter of volume; Rather than must select for use and can cover high band but the bigger cavity body filter of volume, thereby help to reduce the volume of AP equipment.And, be reduced to the signal that lower frequency carries out filtering and passed through the low noise processing and amplifying earlier, thereby can eliminate the noise that is produced in lower frequency filtering to a certain extent, thereby can guarantee also can suppress effectively to disturb in lower frequency filtering.

Description of drawings

Fig. 1 is the structural representation of existing a kind of AP equipment;

Fig. 2 is AP equipment and the structural representation of anti-jamming circuit thereof among the utility model embodiment.

Embodiment

For the purpose, technical scheme and the advantage that make the utility model is clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, to the utility model further explain.

The signal that present embodiment receives AP equipment is reduced to lower frequency to carry out filtering and after filtering, again signal is reverted to original frequency; Be in order to make above-mentioned filtering be difficult to cover high band but the less filter of volume is realized like this based on for example SAW filter etc., rather than must be based on covering high band but the bigger cavity body filter of volume is realized.Thereby, just can help to reduce the volume of AP equipment.

In addition; Consider in lower frequency filtering meeting and produce certain noise; Therefore; Carry out earlier signal being carried out the low noise processing and amplifying so that eliminate the noise that is produced in lower frequency filtering to a certain extent before the filtering signal being reduced to lower frequency, thereby can guarantee also can suppress effectively to disturb in lower frequency filtering.

Fig. 2 is AP equipment and the structural representation of anti-jamming circuit thereof among the utility model embodiment.As shown in Figure 2, the AP equipment 200 in the present embodiment has antenna 11, preposition receiving circuit 12 and the baseband processing chip 13 of order series connection, and in order to improve antijamming capability, this AP equipment 200 also comprises an anti-jamming circuit 20.

This anti-jamming circuit 20 is used for that the signal that receives is reduced to lower frequency and carries out filtering, and, after filtering, signal is reverted to original frequency and output.

And; This anti-jamming circuit 20 is connected between preposition receiving circuit 12 and the baseband processing chip 13, so that the primary signal that antenna 11 receives can carry out the low noise processing and amplifying and then be reduced to low frequency by anti-jamming circuit 20 carrying out filtering through receiving circuit 12 earlier.

Specifically, this anti-jamming circuit 20 comprises:

Lower frequency changer circuit 21, its first signal (signal of primary signal through obtaining after the low noise processing and amplifying) to 12 outputs of preposition receiving circuit carry out the secondary signal (primary signal is the signal through obtaining after low noise processing and amplifying and the down-converted successively) that down-converted and output frequency are lower than first signal;

Interference suppression filter 22, it carries out Filtering Processing to secondary signal and exports the 3rd signal (primary signal is successively through low noise processing and amplifying, down-converted and the signal through obtaining after the Filtering Processing filtering interfering) that filtering obtains;

Up-converter circuit 23, the 4th signal (primary signal successively through low noise processing and amplifying, down-converted, the signal that obtains after through Filtering Processing filtering interfering and upconversion process) that it carries out upconversion process to the 3rd signal and equals first signal to baseband processing chip 13 output frequencies;

It is thus clear that; Because the secondary signal of being carried out Filtering Processing by interference suppression filter 22 is through the low frequency signal after the down-converted; Therefore, interference suppression filter 22 for example can select that SAW filter etc. is difficult to cover high band but the less filter of volume for use, rather than must select cavity body filter for use; Thereby, can help to reduce the volume of AP equipment 200 than prior art.

And, owing to the secondary signal of being carried out Filtering Processing by interference suppression filter 22 has been passed through the low noise processing and amplifying, thereby can eliminate the noise that is produced in lower frequency filtering to a certain extent.

In the practical application; Interference suppression filter 22 can be selected the filter of squareness factor (squareness factor as herein described is meant the ratio of 60DB bandwidth and 3DB bandwidth) in 1～3 scope for use; For example SAW filter (Surface Acoustic Wave Filter, SAWF).

Certainly; Also can select for use squareness factor greater than 3 filter; At this moment, can be with squareness factor greater than a plurality of filter cascades of 3, to remedy the deficiency of squareness factor, so; As long as squareness factor less than cavity body filter, still can make the volume of AP equipment 200 reduce to some extent greater than 3 the cumulative volume of a plurality of filters after cascade.

Other need to prove; Though in anti-jamming circuit as shown in Figure 2 20, lower frequency changer circuit 21 all has only one with up-converter circuit 23; In practical application; Can a plurality of lower frequency changer circuits 21 and a plurality of up-converter circuits 23 be set according to different demands, that is, be in series with between preposition receiving circuit 12 and the interference suppression filter 22 between a plurality of lower frequency changer circuit 21, interference suppression filter 22 and the baseband processing chip 13 and be in series with a plurality of up-converter circuits 23; Like this, be easier to adjust to the required frequency of filtering.

Preferably; When a plurality of lower frequency changer circuits 21 and a plurality of up-converter circuit 23 are set; The quantity of a plurality of lower frequency changer circuits 21 can be identical with the quantity of a plurality of up-converter circuits 23, and a plurality of lower frequency changer circuits 21 that quantity is identical and the frequency conversion multiple of a plurality of up-converter circuits 23 can be symmetrical set; Promptly; The down-conversion multiple of the individual lower frequency changer circuit 21 of the m of series connection (m for greater than 1 positive integer) can be followed successively by 16,8,4......, and correspondingly, the up-conversion multiple of m up-conversion 23 just is followed successively by ... 4,8,16.

In addition; In being provided with the AP equipment 200 of anti-jamming circuit 20; Preposition receiving circuit 12 can comprise that usually order is connected on prefilter and low noise amplifier between antenna 11 and the lower frequency changer circuit 21 (Low Noise Amplifier, the RF switch of between antenna 11 and prefilter, also might connecting LNA) and alternatively.In this case, can meet the following conditions through the filter factor that prefilter is set:

Make the power of primary signal can be adjusted in the power bracket of LNA, take place when avoiding LNA that primary signal is carried out the low noise processing and amplifying saturated and cause first distorted signals that obtains;

And, make the power of first signal can be adjusted in the power bracket of lower frequency changer circuit 21, take place when avoiding lower frequency changer circuit that first signal is carried out down-converted saturated and cause the secondary signal distortion that obtains.

The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; All within the spirit and principle of the utility model, any modification of being made, be equal to replacement, improvement etc., all should be included within the scope of the utility model protection.

Claims

1. access point apparatus; The antenna, preposition receiving circuit and the baseband processing chip that comprise the order series connection; It is characterized in that, also comprise anti-jamming circuit, said anti-jamming circuit is connected between preposition receiving circuit and the baseband processing chip of said access point apparatus and comprises:

2. access point apparatus according to claim 1 is characterized in that, the squareness factor of said interference suppression filter is in 1～3 scope, and said squareness factor is the ratio of 60DB bandwidth and 3DB bandwidth.

3. access point apparatus according to claim 2 is characterized in that, said interference suppression filter is a SAW filter.

4. access point apparatus according to claim 1 is characterized in that, said lower frequency changer circuit and said up-converter circuit are one.

5. access point apparatus according to claim 1; It is characterized in that, be in series with a plurality of said lower frequency changer circuits between said preposition receiving circuit and the said interference suppression filter, between said interference suppression filter and said baseband processing chip, be in series with a plurality of said up-converter circuits.

6. access point apparatus according to claim 5 is characterized in that, the quantity of a plurality of said lower frequency changer circuits is identical with the quantity of a plurality of said up-converter circuits; And a plurality of said lower frequency changer circuit that quantity is identical and the frequency conversion multiple of a plurality of said up-converter circuits are symmetrical set.

7. access point apparatus according to claim 1; It is characterized in that; Said preposition receiving circuit comprises that order is connected on prefilter and the low noise amplifier between said antenna and the said lower frequency changer circuit; Wherein, the filter factor of said prefilter makes the power of said primary signal can be adjusted in the power bracket of said low noise amplifier and the power of said first signal can be adjusted in the power bracket of said lower frequency changer circuit.

8. access point apparatus according to claim 7 is characterized in that, said preposition receiving circuit further comprises the RF switch that is connected between said antenna and the said prefilter.