CN101431341A

CN101431341A - Signal processing circuit

Info

Publication number: CN101431341A
Application number: CN 200710185070
Authority: CN
Inventors: 张仲尧; 颜光裕
Original assignee: Realtek Semiconductor Corp
Current assignee: Realtek Semiconductor Corp
Priority date: 2007-11-06
Filing date: 2007-11-06
Publication date: 2009-05-13
Anticipated expiration: 2027-11-06
Also published as: CN101431341B

Abstract

A signal processing circuit comprises a first frequency synthesizer, a second frequency synthesizer, a first radio-frequency circuit, a first analog front end circuit, a second radio-frequency circuit and a second analog front end circuit; wherein, the first frequency synthesizer and the second frequency synthesizer are respectively used for generating a first frequency and a second frequency; the first radio-frequency circuit is coupled with the first frequency synthesizer; the first analog front end circuit is coupled with the first radio-frequency circuit; the second radio-frequency circuit is coupled with the second frequency synthesizer; and the second analog front end circuit is coupled with the second radio-frequency circuit; wherein, the first radio-frequency circuit and the first analog front end circuit can support signal transmission of a first frequency band, and the second radio-frequency circuit and the second analog front end circuit can support signal transmission of a second frequency band; the center frequency of the first frequency band is equal to the first frequency, and the center frequency of the second frequency band is equal to the second frequency.

Description

Signal processing circuit

Technical field

The present invention especially refers to a kind of signal processing circuit with a plurality of frequency synthesizers about a kind of signal processing circuit.

Background technology

At wireless network (wireless local-area network; WLAN) in the application; in order to reach higher transmission rate and better transmission quality; the signal processing circuit of wireless network can cooperate multiple input and output (multiple-input multiple-output usually; MIMO) technology, that is utilize a plurality of antennas to give and receive a plurality of independently signal crossfires (signal stream).

In addition, in order to improve the transmission rate of data, the most effective and the most direct mode is the transmission bandwidth that increases signal, for instance, the information band of Radio Network System institute standard is 20MHz traditionally, yet present radio network technique can allow the frequency band of 20MHz is extended for the frequency band of 40MHz, to carry out transfer of data faster.

See also Fig. 1, Fig. 1 is the schematic diagram of known signal treatment circuit 100.As shown in Figure 1, signal processing circuit 100 has a plurality of (4) antenna 111-114,121, four analog front circuit 131-134 of a radio circuit, a baseband circuit 141, and a frequency synthesizer 151.Wherein, each antenna 111-114 can send respectively and receive an independently signal crossfire, to support aforesaid multiple input and output technology.Note that because antenna 111-114 at this, radio circuit 121, analog front circuit 131-134, and the function of baseband circuit 141 has been well known in the art with operation, so do not give unnecessary details in this in addition.

In addition, because signal processing circuit 100 only has a frequency synthesizer 151, therefore no matter which kind of signal bandwidth is signal processing circuit 100 adopt transmit, and radio circuit 121 all only can use single centre frequency f (carrier frequency).

See also Fig. 2 at this, Fig. 2 is the rough schematic view of signal processing circuit 100 output signals.When signal processing circuit 100 during with the bandwidth output signal of 40MHz, because the restriction of single-frequency synthesizer 151, therefore reach left to right translation 10MHz (so just becoming the two adjacent frequency bands of centre frequency) by the signal of baseband circuit 141 at a distance of 20MHz with the corresponding 20MHz bandwidth of script, then, the centre frequency f that radio circuit 121 utilizes frequency synthesizer 151 to be provided again is on the 40MHz frequency band of f with signal carrier to centre frequency.Thus, signal processing circuit 100 just can transfer the transfer of data of 40MHz bandwidth to from the transfer of data of script 20MHz bandwidth.

Yet aforesaid structure (single-frequency synthesizer structure) has some shortcomings.At first, when radio circuit 121 carries out the signal reception, all can carry out the operation of filtering, the signal of palpus to obtain.See also Fig. 3 at this, the spectrum diagram when Fig. 3 carries out the signal reception for signal processing circuit 400 shown in Figure 1.As shown in Figure 3, when radio circuit 121 reception bandwidth are the signal of 40MHz, because the restriction of single-frequency synthesizer structure, radio circuit 121 is when carrying out filtering operation, only the centre frequency of filtered band can be set in the centre frequency f that frequency synthesizer 151 is provided, and filtered band is set at 40MHz.Thus, the signal of two 20MHz just can be subjected to map (image) each other and interfere with each other (that is when carrying out signal analysis, wherein a signal can become the noise of another signal), therefore, when the signal analysis of carrying out thereafter (for example performed frequency reducing sampling operation of analog front circuit 131-134 thereafter), just can cause the phenomenon of distorted signals.

In addition, because the restriction of single-frequency synthesizer, before the switching signal bandwidth, whether signal processing circuit 100 can't detect adjacent channel in advance is a clean channel.Thus, after signal processing circuit 100 switches to the signal transmission of 40MHz, the defeated bag of tendency to develop may clash (collision) with the bag that other users are being transmitted, and causes data throughout (throughput) not increase counter falling on the contrary when serious.

Summary of the invention

One of purpose of the present invention is to provide a kind of signal processing circuit with a plurality of frequency synthesizers, to solve the problem in the known technology.

According to one embodiment of the invention, a kind of signal processing circuit is disclosed, it includes: a first frequency synthesizer (synthesizer) is used for producing a first frequency; One first radio circuit is coupled to this first frequency synthesizer, can receive one first radiofrequency signal of corresponding one first frequency band according to this first frequency, and produce one first internal signal according to this first radiofrequency signal; (analogfront end, AFE) circuit are coupled to this first radio circuit to one first AFE (analog front end), can receive this first internal signal, to produce one first digital signal according to this first internal signal; One second frequency synthesizer can produce a second frequency; One second radio circuit is coupled to this second frequency synthesizer, can receive one second radiofrequency signal of corresponding one second frequency band according to this second frequency, and produce one second internal signal according to this second radiofrequency signal; One second analog front circuit is coupled to this second radio circuit, can receive this second internal signal, to produce one second digital signal according to this second internal signal; And a baseband circuit, be coupled to this first analog front circuit and this second analog front circuit, can handle this first digital signal and this second digital signal; Wherein the centre frequency of this first frequency band is this first frequency, and the centre frequency of this second frequency band is this second frequency.

According to one embodiment of the invention, a kind of signal processing circuit is also disclosed, it includes: a baseband circuit is used for producing one first digital signal and one second digital signal; One first AFE (analog front end) (ana log front end, AFE) circuit is coupled to this baseband circuit, is used for receiving this first digital signal, and this first digital signal is converted to one first internal signal; One first frequency synthesizer (synthesizer) is used for producing a first frequency; One first radio circuit is coupled to this first frequency synthesizer and this first analog front circuit, is used for according to this first frequency, this first internal signal is converted to one first radiofrequency signal of corresponding one first frequency band; One second analog front circuit is coupled to this baseband circuit, is used for receiving this second digital signal, and this second digital signal is converted to one second internal signal; One second frequency synthesizer (synthesizer) is used for producing a second frequency; One second radio circuit is coupled to this second frequency synthesizer and this second analog front circuit, is used for according to this second frequency, this second internal signal is converted to one second radiofrequency signal of corresponding one second frequency band; Wherein the centre frequency of this first frequency band is this first frequency, and the centre frequency of this second frequency band is this second frequency.

According to one embodiment of the invention, a kind of signal processing circuit is also disclosed, it includes: a first frequency synthesizer (synthesizer) is used for producing a first frequency; One first radio circuit is coupled to this first frequency synthesizer, can receive one first radiofrequency signal of corresponding one first frequency band according to this first frequency, and produce one first internal signal according to this first radiofrequency signal; (analogfront end, AFE) circuit are coupled to this first radio circuit to one first AFE (analog front end), can receive this first internal signal, to produce one first digital signal according to this first internal signal; One baseband circuit is coupled to this first analog front circuit, can handle this first digital signal and produce one second digital signal; One second analog front circuit is coupled to this baseband circuit, can receive this second digital signal, and produces one second radiofrequency signal according to this second internal signal; And a second frequency synthesizer, can produce a second frequency; One second radio circuit is coupled to this second analog front circuit, can receive this second internal signal, and according to this second frequency and this second internal signal, produces one second radiofrequency signal of corresponding one second frequency band; Wherein the centre frequency of this first frequency band is this first frequency, and the centre frequency of this second frequency band is this second frequency.

According to one embodiment of the invention, a kind of signal processing circuit is also disclosed, it can carry out the signal transmission with a network equipment, this network equipment is supported the signal transmission of one first frequency band or one second frequency band, this signal processing circuit includes: one first signal transmission module, and it can carry out the signal transmission by this first frequency band; One secondary signal transport module, it can carry out the signal transmission by this first frequency band or this second frequency band; An and detection module, be used for when this first signal transmission module carries out the signal transmission with this first frequency band and this network equipment, detect this second frequency band and whether block (busy), if this frequency band and unblock, then this secondary signal transport module carries out signal transmission by this second frequency band and this access point simultaneously, transmits to allow this signal processing circuit to carry out signal with this first frequency band and this second frequency band and this network equipment simultaneously.

According to one embodiment of the invention, a kind of signal processing circuit is also disclosed, it can carry out the signal transmission with a network equipment, this network equipment is supported the signal transmission of one first frequency band or one second frequency band, this signal processing circuit includes: one first signal transmission module, and it can carry out the signal transmission by this first frequency band; One secondary signal transport module, it can carry out the signal transmission by this first frequency band or this second frequency band; An and detection module, be used for when this first signal transmission module carries out the signal transmission with this first frequency band and this network equipment, whether detect this second frequency band blocks, if this frequency band and unblock, then this secondary signal transport module carries out signal transmission by this second frequency band and this access point simultaneously, transmits to allow this signal processing circuit to carry out signal with this first frequency band and this second frequency band and this network equipment simultaneously.

Description of drawings

Fig. 1 is the schematic diagram of known signal treatment circuit.

Fig. 2 is the rough schematic view of signal processing circuit output signal.

Spectrum diagram when Fig. 3 carries out the signal reception for signal processing circuit shown in Figure 1.

Fig. 4 is the functional block diagram of signal processing circuit of the present invention.

Spectrum diagram when Fig. 5 carries out the signal reception for signal processing circuit shown in Figure 4.

Rough schematic view when Fig. 6 is a signal processing circuit output signal shown in Figure 4.

Fig. 7 carries out the flow chart of signal transmission (bag transmission) for a signal processing circuit shown in Figure 4 and an access point.

Fig. 8 switches different access points to carry out the flow chart of signal transmission for signal processing circuit.

Fig. 9 is the functional block diagram of an embodiment of frequency synthesizer.

Accompanying drawing number

400 signal processing circuits

411,412,413,414 antennas

421,422 radio circuits

431,432,433,434 analog front circuits

441 baseband circuits

451,452 frequency synthesizers

461,462,481,482 signal energy detection modules

471,472 transmission time detection modules

911,921 phase-locked loops

912,922 phase detectors

913,923 charge pump circuits

914,924 loop filters

915,925 voltage controlled oscillators

916,926 lifting frequency circuit

917,927 frequency selectors

Embodiment

Describe the present invention in detail below with reference to accompanying drawing.

See also Fig. 4, Fig. 4 is the functional block diagram of signal processing circuit 400 of the present invention.As shown in Figure 4, signal processing circuit 400 also includes 421,422, four analog front circuits 431,432,433,434 of 411,412,413,414, two radio circuits of 4 antennas, and a baseband circuit 441.Yet, note that at this corresponding to two radio circuits 421,422, signal processing circuit 400 of the present invention includes two frequency synthesizers 451,452, it is used to provide a frequency f 1, f2 respectively to radio circuit 421,422.

Wherein, each antenna 411-414 all can receive independently signal crossfire, to support multiple input and output.And each antenna radio circuit, analog front circuit, frequency synthesizer corresponding with it can be considered as a signal transmission module.For instance, the radio circuit 421 that antenna 411 is corresponding with it, analog front circuit 431, frequency synthesizer 451 can be considered one group of signal transmission module; To state in open in following in this function that note that inner each element of signal processing circuit 400 and operation.

In addition, note that at this aforesaid baseband circuit 441 is a general designation with radio circuit 442, and its inner function and operation can be defined by circuit designers; Therefore, in present embodiment, baseband circuit 441 is except the signal transfer functions of supporting to have, definition has detection module 491,492 in addition, it includes signal energy detection module 461,462 and transmission time detection module 471,472 respectively, and radio circuit 442 is except the function of supporting signal transmission, and also definition has signal energy detection module 481-482 in addition, and the function of aforementioned each element and operation also will be stated in open in following, so do not give unnecessary details in addition.

When signal processing circuit 400 is carried out the signal reception, antenna 411-414 is used for received RF signal, and the function class of radio circuit 421,422 is similar to receiver (tuner), it is used for handling the radiofrequency signal that antenna 411-414 receives respectively, and carry out filtering operation according to frequency synthesizer 451, the 452 centre frequency f1 that provided, f2, receiving the radiofrequency signal of special frequency band, and the radiofrequency signal that receives is converted to internal signal (for example transferring intermediate-freuqncy signal to through the frequency reducing operation).Then, analog front circuit 431-434 just can carry out the operation of frequency reducing sampling to these internal signals, to produce the digital signal of the fundamental frequency that can supply baseband circuit 441 processing.At last, baseband circuit 441 just can be handled these digital signals, to analyze the entrained information of signal (for example data of being transmitted) on wireless network.

On the other hand, when signal processing circuit 400 must dateout, each inner member system carried out the reverse operating that aforementioned signal receives in the signal processing circuit 400, with output signal; That is this moment, baseband circuit 441 was used for producing the defeated fundamental frequency digital signal of tendency to develop, and it carries the desire information transmitted; Then, analog front circuit 431-434 just can be converted to these digital signals the internal signal of simulation; At last, radio circuit 411-412 just can be according to frequency synthesizer 451, the 452 centre frequency f1 that provided, f2, with these internal signal carrier waves to centre frequency f1, f2; Thus, the defeated data of tendency to develop just can send by antenna 411-414.

Note that in present embodiment that at this for different radio circuit 421,422, signal processing circuit 400 is built accordingly and put two frequency synthesizers 451,452, therefore, signal processing circuit 400 just can not be subjected to the restriction of aforementioned single-frequency synthesizer.

See also Fig. 5 at this, the spectrum diagram when Fig. 5 carries out the signal reception for signal processing circuit 400 shown in Figure 4.As shown in Figure 5, because frequency synthesizer 451,452 can be used for producing different frequency f 1 respectively, f2 uses for radio circuit 421,422, therefore when radio circuit 421,422 carries out the signal reception with the frequency band of 40MHz, radio circuit 421-422 just can be according to different centre frequency f1, f2, set different filtered band respectively, receive with the signal that carries out the 20MHz frequency band respectively.Thus, because radio circuit 421,422 is to carry out filtering with different 20MHz frequency bands respectively, therefore, when the signal analysis of carrying out thereafter, the map that signal just can not be subjected to is each other disturbed, also and then avoided distortion.

In addition, see also Fig. 6, the rough schematic view when Fig. 6 is signal processing circuit 400 output signals shown in Figure 4.As shown in Figure 6, because signal processing circuit 400 has two frequency synthesizers 451,452, therefore, compared to aforesaid signal processing circuit 100, baseband circuit 441 can directly pass through the frequency band of two 20MHz, export the fundamental frequency digital signal that tendency to develop is passed, and radio circuit 421,422 thereafter just can transmit this two signals to utilize different 20MHz frequency bands respectively by different centre frequency f1, f2.

By foregoing disclosure as can be known, because signal processing circuit 400 adopts two radio circuits to cooperate the structure of two frequency synthesizers, therefore on using, bandwidth has more flexibility.As previously mentioned, as frequency synthesizer 451, the 452 centre frequency f1 that provided, when f2 differs 20MHz, and when two radio circuits 421,422 all have the filtered band of 20MHz, signal processing circuit 400 not only can have the effect of known two adjacent 20MHz frequency bands so, and the map that can avoid signal to be subjected to is each other disturbed.

In addition, such structure also has other function mode, for instance, when frequency synthesizer 451,452 frequency f that provided 1, when f2 is identical, and when two radio circuits 421,422 (four antenna 411-414) adopted identical filtered band, signal processing circuit 400 just can be sent the signal of receiving same frequency band (for example all supporting the same frequency band of 20MHz) simultaneously.

On the other hand, when frequency synthesizer 451, the 452 centre frequency f1 that provided, f2 differ 20MHz when above, two radio circuits 411,412 (four antenna 411-414) even can pass through two non-conterminous frequency bands, reception/output signal simultaneously, in other words, the present invention can utilize two non-conterminous frequency bands to reach the transmission of 40MHz.For instance, because the channel characteristic of adjacency channel might not be best, or adjacent passage is occupied by other users, and the present invention's this moment just can utilize frequency synthesizer 451,452, utilizes different frequency bands to transmit to allow the user.

Note that at this present invention does not limit the position of centre frequency f1, f2, circuit designers can be set centre frequency f1, the f2 of institute palpus according to its demand, and so corresponding variation also belongs to category of the present invention.

In addition, under such structure, signal processing circuit 400 can detect the signaling traffic that extends frequency band in advance before the switching of carrying out transmission bandwidth; Thus, just can avoid after bandwidth is switched the collision problem of bag.

See also Fig. 7 at this, Fig. 7 carries out the flow chart of signal transmission (bag transmission) for a signal processing circuit 400 shown in Figure 4 and an access point.Note that at this this access point system supports the signal transmission of 20/40MHz bandwidth; In addition, thereafter explanation for convenience, system is called control frequency band (control channel) with the initial 20MHz frequency band of setting up of signal processing circuit 400 and this access point, and the newly-increased 20MHz frequency band in switch of frequency band (switching to 40MHz from 20MHz) back just claims for extending frequency band (extensionchannel); And this flow chart includes the following step:

Step 700: utilize frequency synthesizer 451 to be connected, and set busy_cnt=0 with the bandwidth mode of an access point with 20MHz;

Step 702: the control frequency band with 20MHz receives bag;

Step 704: whether the control frequency band blocks, if then be connected to step 708, otherwise be connected to step 706;

Step 706: utilize frequency synthesizer 452 simultaneously to receive bag, to improve the transmission situation of bag by the control frequency band;

Step 708: whether the control frequency band is an edge frequency band, if then be connected to step 709, otherwise be connected to step 710;

Step 709: detect one-sided 20MHz frequency band;

Step 710: the 20MHz frequency band that detects both sides;

Step 712: select more low-energy frequency band in two frequency bands;

Step 714: whether this frequency band blocks, if then be connected to step 718, otherwise be connected to step 716;

Step 716: switch to the frequency band of 40MHz, receive bag;

Step 718: set busy_cnt=busy_cnt+1;

Step 720: if busy_cnt greater than a predetermined value, then is connected to step 706, otherwise is connected to step 702.

At first, as known in the art, before carrying out the signal transmission, signal processing circuit 400 can be carried out site investigation (site survey) earlier, to learn the access point that can support 20M/40MHz.In addition, when initial condition, signal processing circuit 400 is set at 0 with a temporary value busy_cnt, will be in describing in detail thereafter, so do not give unnecessary details in this in addition as for the function of this temporary value.

Then, signal processing circuit 400 just can support the access point of 20M/40MHz bandwidth for transmission to set up be connected (step 700) of 20MHz earlier with one according to aforesaid site investigation result; Note that as previously mentioned that at this signal processing circuit 400 can be utilized wherein any frequency synthesizer of frequency synthesizer 451 or frequency synthesizer 452, produce must centre frequency, to reach the purpose that connects with this access point; And in present embodiment, signal processing circuit 400 is utilized frequency synthesizer 451, comes to connect with this access point; In other words, the centre frequency f1 that this moment, frequency synthesizer 451 was provided just can equal to control the centre frequency of frequency band, with the signal transmission of support with this access point.

Thus, signal processing circuit 400 just can be by frequency synthesizer 451 counter element (such as antenna 411-412, radio circuit 421, analog front circuit 431-432) and this access point carry out signal transmission (step 702) with the control frequency band of 20MHz, to receive bag.

Then, when carrying out the signal transmission, whether baseband circuit 441 just can detect the control frequency band congested, whether the bandwidth of 20MHz will be switched to 40MHz with decision.Note that at this whether detect frequency band blocks to be equivalent to and detect frequency band and whether meet a predetermined state, for instance, can be by detecting the signal energy on the frequency band, whether the bag transmission speed meets a predetermined state is realized.In present embodiment, baseband circuit 441 lie in detection module 491,492 in, defined transmission time detection module 471,472 respectively, to be used for carrying out aforesaid detecting operation; As known in the art, when bag transmits, if it is very long to transmit a bag needed stand-by period (backoff time), so just represent that wrap employed transmission channel this moment blocks very much, therefore, in present embodiment, transmission time detection module 471 calculates the average latency of transmitting a bag institute palpus on the control frequency band, and whether look it greater than a predetermined threshold, if the average latency is greater than a predetermined threshold, then representative control frequency band is in blocked state (as previously mentioned, that is frequency band meet a predetermined state), otherwise then representative control frequency band is not to be in blocked state (step 704).

If the control frequency band is not to be in blocked state, can be satisfied with in the transmission rate of control frequency band so at present, at this moment, just need not be painstakingly the bandwidth of 20MHz be switched to higher bandwidth, so the frequency that signal processing circuit 400 can be provided frequency synthesizer 452 also changes frequency f 1 into, thus, frequency synthesizer 452 pairing elements (such as antenna 413-414, radio circuit 422, analog front circuit 433-434) just can carry out the signal transmission with control frequency band and this access point simultaneously, further to increase the efficient (step 706) that signal transmits.

In addition, if the control frequency band is in blocked state, represent that present transmission is out of condition, signal processing circuit 400 bandwidth of 40MHz of just can trying the bandwidth of script 20MHz is switched at this moment is to improve status transmission.

Therefore, signal processing circuit 400 can go to detect the situation of extending frequency band, whether will switch bandwidth with decision.At first, radio circuit 421 can detect earlier whether the control frequency band is an edge frequency band (step 708), and then, if the control frequency band is an edge frequency band, signal processing circuit 400 just need only detect the extension frequency band (step 709) of a side so.

On the other hand, if the control frequency band is not to be an edge frequency band, signal energy detection module 462 just can cooperate frequency synthesizer 452 so, detects the signal energy (step 710) that the both sides phase frequency is extended frequency band, and selects the extension frequency band of frequency band to use as desire that signal energy is lower.

Then, signal processing circuit 400 can detect the extension frequency band and whether block (step 714), at this moment, is in blocked state if extend frequency band, and signal processing circuit 400 just can add 1 (step 718) with aforesaid temporary value busy_cnt.

By foregoing disclosure as can be known, temporary value busy_cnt is used for the expression system and detects and extend the number of times that frequency band is in blocked state, also or can be considered the duration that the extension frequency band is in blocked state.Whether detect the extension frequency band repeatedly for fear of signal processing circuit 400 blocks always, and wasted the transmission usefulness of entire system, therefore, as temporary value busy_cnt during greater than a predetermined value, signal processing circuit 400 will stop to detect the situation of extending frequency band, and transfer the frequency that frequency synthesizer 452 is provided is also changed into the centre frequency f1 of control frequency band, thus, frequency synthesizer 452 pairing elements (such as antenna 413-414, radio circuit 422, analog front circuit 433-434) just can carry out the signal transmission with control frequency band and this access point simultaneously, to improve the efficient (step 706) of signal transmission.

On the other hand,, be not in blocked state, just signal processing circuit 400 can be utilized frequency synthesizer 452, to connect by extending frequency band and this access point if extend frequency band if in step 714; In other words, the centre frequency that the centre frequency f2 that this moment, frequency synthesizer 452 was provided just can equal to extend frequency band is with the signal transmission of support with this access point.

Thus, signal processing circuit 400 just can be by frequency synthesizer 452 counter element (such as antenna 413-414, radio circuit 422, analog front circuit 433-434) and this access point carry out signal transmission (step 716) with the extension frequency band of 20MHz, to receive bag.

Therefore, the signal transmission by script 20MHz control frequency band is gone up in signal processing circuit 400 equivalences, switches to the signal transmission of 40MHz (including the control frequency band of 20MHz and the extension frequency band of 20MHz).

Note that in step 714 that at this signal processing circuit 400 can be utilized different modes, judge whether extend frequency band blocks.Wherein, first kind of mode is to utilize baseband circuit 441 inner defined energy detection module 462 to come detection analog front end circuit 433,434 digital signals that passed over, if the signal energy of digital signal less than a predetermined threshold, so just represents this moment not strong in the signal strength signal intensity of extending frequency band.At this moment, signal processing circuit 400 can judge that just extending frequency band does not block.

Perhaps, baseband circuit 441 can be added up in a period of time in addition, the signal energy of digital signal surpasses the number of times of a predetermined threshold, and then (being the carrier wave that extends the frequency band passage detects than (CSR to calculate the time scale that signal energy surpasses a predetermined threshold, carrier sense ratio)), if CSR is less than another threshold value, baseband circuit can judge according to this that just this extension passage does not block so.

And the second way is to utilize radio circuit 422 inner defined signal energy detection modules 482 to detect received radiofrequency signal, judges whether extend frequency band blocks.Because the quality of the digital signal that baseband circuit is received often is subject to the resolution of analog front circuit, therefore, the mode of utilizing radio circuit to detect can be more accurate.For instance, the received signal energy intensity (RSSI, received signal strength indicator) that radio circuit can utilization itself be provided, in the same manner, if radio frequency energy is less than a predetermined threshold, just represent this moment not strong in the signal strength signal intensity of extending frequency band so.At this moment, signal processing circuit 400 can judge that just extending frequency band does not block.

In the same manner, radio circuit 441 also can be added up in a period of time in addition, the signal energy of radiofrequency signal surpasses the number of times of a predetermined threshold, and then (being the carrier wave that extends the frequency band passage detects than (CSR to calculate the time scale that signal energy surpasses a predetermined threshold, carrier sense ratio)), wherein if CSR less than another threshold value, radio circuit can judge according to this that just this extension passage does not block so.

Please note at this, by foregoing disclosure as can be known, because the present invention has a plurality of frequency synthesizers and corresponding radio frequency circuit, so signal processing circuit of the present invention 400 can be before switching bandwidth, whether detect the extension frequency band in advance and block, whether decision will utilize the extension frequency band to transmit data again; Therefore, the present invention can avoid in known technology, owing to can't detect the extension frequency band in advance, and cause frequency band to switch the problem of back bag collision.

In addition, except bandwidth is switched, because signal processing circuit 400 has the structure that adopts two radio circuits to cooperate two frequency synthesizers, so signal processing circuit 400 also can be switched different access points to reach best communication quality in good time under the situation that not interrupt connection at present.That is signal processing circuit 400 can be carried out the signal transmission by a frequency band (passage) and one first access point, and detects the signaling traffic of the transmission channel (another frequency band) of one second access point simultaneously; Thus, slow excessively when the transmission rate of first access point, and the transmission channel of second access point is not when blocking, and the just changeable access point of signal processing circuit 400 is to carry out the signal transmission with this access point.

See also Fig. 8 at this, Fig. 8 switches different access points to carry out the flow chart of signal transmission for signal processing circuit 400.It includes the following step:

Step 800: utilize frequency synthesizer 451 and one first access point to carry out the signal transmission with a frequency band;

Step 802: detect this frequency band and whether block, if then be connected to step 806, otherwise be connected to step 800;

Step 806: the centre frequency that frequency synthesizer 452 is provided is set at the centre frequency of the transmission channel of one second access point;

Step 808: whether the transmission channel of judging second access point blocks, if the transmission channel of second access point is in clogged conditions, then is connected to step 812; Otherwise then be connected to step 816;

Step 812: the centre frequency that frequency synthesizer 451 is provided also switches to the centre frequency of the transmission channel of second access point;

Step 814: carry out the signal transmission with second access point;

Step 816: with the former passage of frequency synthesizer 452 switchbacks;

Step 818: wait for a special time length;

Step 820: whether will detect this first frequency band again and whether block, if then be connected to step 800, otherwise be connected to step 806.

At first, signal processing circuit 400 can connect with first access point, and begins to carry out signal transmission (bag transmission); In present embodiment, signal processing circuit 400 utilizes frequency synthesizer 451, antenna 411,412, radio circuit 421, analog front circuit 431-432 and this first access point to carry out signal transmission (step 800) with a frequency band.

Then, whether signal processing circuit 400 is to detect this frequency band to block; As previously mentioned, transmission time detection module 471 can calculate on this frequency band the average latency (backofftime) of transmitting a bag institute palpus, and whether look it greater than a predetermined threshold, if the average latency is greater than a predetermined threshold, then represent this frequency band to be in blocked state, otherwise then representing this frequency band is not to be in blocked state (step 802).

If this frequency band is not to be in blocked state, then expression can be satisfied with the transmission rate of first access point at present, at this moment, just need not painstakingly present connection be switched to other access point, therefore, 400 continuation of signal processing circuit and first access point transmit (for example also frequency synthesizer 452 can be switched back centre frequency originally, with the transfer of data of support script with first access point).

In addition, if this frequency band is in blocked state, the transmission quality that expression connects at present is not good, and this moment, signal processing circuit 400 just can try to detect the situation of other access points, whether is fit to carry out the signal transmission to look it.

Therefore, the centre frequency that signal processing circuit 400 can be provided frequency synthesizer 452 is set at the centre frequency of the transmission channel of one second access point, with the situation (step 806) of the transmission channel that detects second access point.

And the mode whether the detected transmission passage blocks, the mode of whether blocking with aforementioned detection extension frequency band is similar, so just repeat no more at this.For instance, the signal energy that signal processing circuit 400 can be come sense channel by defined signal energy detection module in radio circuit or the baseband circuit judges whether passage blocks; Carry out the judgement whether passage blocks again or can calculate the CSR of transmission channel.

Do not block if signal processing circuit 400 is judged the transmission channel of second access point, signal processing circuit 400 just can also switch to the centre frequency f1 that frequency synthesizer 451 is provided the centre frequency (step 812) of the transmission channel of second access point so; To carry out the signal transmission with second access point.In other words, signal processing circuit 400 just can switch to the transmission channel of second access point now, carries out signal transmission (step 814) with the whole elements that utilize signal processing circuit 400 inside.

On the other hand, if signal processing circuit 400 judges that the transmission channel of second access point is in blocked state, signal processing circuit 400 just can transfer to detect other supported access points so, all be in blocked state if find all access points (passage), signal processing circuit 400 just can be switched back frequency synthesizer 452 centre frequency originally, with the transfer of data (step 816) of support script with first access point.

Then, for fear of when all passages all block, signal processing circuit 400 still detects different access points constantly, and therefore, signal processing circuit 400 can be waited for a scheduled time length (step 818).

Please note at this, after signal processing circuit 400 can be waited for a scheduled time length, whether signal processing circuit 400 can be taked two kinds of ways, and first kind of way is the tunnel condition that reappraises first access point, need the switch access point to carry out the signal transmission to look it; For instance, if the transmission situation of first access point just can be satisfied with next time, just need not carry out the switching of access point when detecting; And second kind of way for the tunnel condition that do not reappraise first access point (in other words, the passage of system's hypothesis first access point is in clogged conditions constantly), therefore, just directly the transmission channel of other access points is detected, with in the switching (step 820) of carrying out access point thereafter.

Note that except switching bandwidth smoothly at this and to carry out signal transmission, and switch access point is carrying out outside signal transmits smoothly, the present invention still has other benefit.Because two radio circuits can operate on different frequency bands respectively with two frequency synthesizers, therefore, in the ad-hoc pattern (that is the existence that does not have access point limits when using 20MHz or the bandwidth of 40MHz), signal processing circuit can be when utilizing a frequency synthesizer to carry out signal reception (Rx), utilize the 20MHz passage at another frequency synthesizer place to make energy measuring, if being found to the 20MHz passage at another frequency synthesizer place does not block, so when system must be converted to signal output (Tx) by the operation that signal receives, just the frequency band that can switch to 40MHz at once transmits data, reaches the benefit of high-throughput.

In addition, signal processing circuit 400 also can be utilized one of them frequency synthesizer (such as frequency synthesizer 451) to carry out signal and receive, and utilize another frequency synthesizer (such as frequency synthesizer 452) to transmit simultaneously, realizing the function of transmitted in both directions simultaneously, and then save the time of many conversions.

In though this note that in front open, each radio circuit 421,422 was all supported the bandwidth of 20MHz, yet this only is one embodiment of the invention, but not restriction of the present invention.

In addition, the method whether aforementioned various sense channels block, such as detection signal strength, RSSI or CSR or the like also only are one embodiment of the invention, but not restriction of the present invention.In actual operation, anyly can reflect the execution mode whether passage blocks, all belong to category of the present invention.

In addition, though in front disclosed, signal processing circuit 400 is to be applied in the field of wireless network, this also is one embodiment of the invention.In actual operation, signal processing circuit 400 can be utilized aforesaid operation, and links up with other signal transmission; So corresponding variation also belongs to category of the present invention.

Make mode in this reality that note that frequency synthesizer, have for this field person and know that usually the knowledgeable should not embarrass; As previously mentioned, frequency synthesizer is used for producing the signal (such as clock signal) with preset frequency, and therefore, frequency synthesizer can be realized by a phase-locked loop.

See also Fig. 9 at this, Fig. 9 is the functional block diagram of an embodiment of two frequency synthesizers 910,920.As shown in Figure 9, each frequency synthesizer all includes a phase-locked loop 911,921, a lifting frequency circuit 916,926 and a frequency selector 917,927.Wherein, phase-locked loop 911,921 includes phase detectors 912,922, charge pump circuit 913,923, loop filter 914,924, and voltage controlled oscillator 915,925.Note that in Fig. 9 that at this element of the same name has identical functions and running, in addition, because the function of phase-locked loop 911,921 has been well known in the art with operation, so do not give unnecessary details in this in addition.

Phase-locked loop 911,921 can be via the selection of frequency selector 917,927, and has different output frequencies.For instance, frequency selector 917,927 can be a frequency eliminator, it has the different frequencies (for example remove 2 with remove 3) of removing respectively, therefore, phase-locked loop 911,921 just can be respectively according to the divisor of frequency eliminator, and output has the signal (its frequency is respectively the different multiples of incoming frequency f) of different frequency.

But, phase-locked loop 911,921 frequencies of being exported may with design load some gap also, therefore lifting frequency circuit 916,926 is used for adjusting phase-locked loop 911,921 frequencies of being exported (it is carried out the operation of lifting frequency), meets frequency f 1, the f2 of design load with generation.

Yet frequency synthesizer 910,920 shown in Figure 9 only is one embodiment of the invention, but not restriction of the present invention.

The above only is preferred embodiment of the present invention, and all equivalences of carrying out according to claim of the present invention change and revise, and all should belong to covering scope of the present invention.

Claims

1. signal processing circuit, it includes:

One first frequency synthesizer is used for producing a first frequency;

One first radio circuit is coupled to this first frequency synthesizer, is used for according to this first frequency, receives one first radiofrequency signal of corresponding one first frequency band, and produces one first internal signal according to this first radiofrequency signal;

One first analog front circuit is coupled to this first radio circuit, is used for receiving this first internal signal, to produce one first digital signal according to this first internal signal;

One second frequency synthesizer is used for producing a second frequency;

One second radio circuit is coupled to this second frequency synthesizer, is used for according to this second frequency, receives one second radiofrequency signal of corresponding one second frequency band, and produces one second internal signal according to this second radiofrequency signal;

One second analog front circuit is coupled to this second radio circuit, is used for receiving this second internal signal, to produce one second digital signal according to this second internal signal; And

One baseband circuit is coupled to this first analog front circuit and this second analog front circuit, is used for handling this first digital signal and this second digital signal;

Wherein the centre frequency of this first frequency band equals this first frequency, and the centre frequency of this second frequency band equals this second frequency.

2. signal processing circuit as claimed in claim 1, it is to be applied to wireless network, is used for carrying out the signal transmission by this first frequency band or this second frequency band and a network equipment.

3. signal processing circuit as claimed in claim 2, wherein when this first radio circuit and this network equipment carried out the signal transmission by this first frequency band, this baseband circuit judged in addition whether this second frequency band blocks.

4. signal processing circuit as claimed in claim 3, wherein if this second frequency band and unblock, then this second radio circuit carries out signal transmission by this second frequency band and this network equipment simultaneously, transmits to allow this signal processing circuit to carry out signal by this first frequency band and this second frequency band and this network equipment simultaneously.

5. signal processing circuit as claimed in claim 2, wherein if this second frequency band is in the time of obstruction greater than a scheduled time length, then this second frequency synthesizer system switches to and produces this first frequency, carries out the signal transmission by this first frequency band and this network equipment simultaneously to allow this first radio circuit and second radio circuit.

6. the described signal processing circuit of claim 3, wherein this baseband circuit includes:

One signal energy estimation module is used for detecting the energy of this second digital signal;

Wherein if the energy of this second digital signal less than a predetermined threshold, then this baseband circuit is judged this second frequency band and unblock.

7. signal processing circuit as claimed in claim 3, wherein this baseband circuit detects the carrier wave detection ratio of this second frequency band in addition, if this carrier wave detects ratio less than a predetermined value, then this baseband circuit is judged this second frequency band and unblock.

8. signal processing circuit as claimed in claim 2, wherein when this first radio circuit and this network equipment carried out the signal transmission by this first frequency band, this second radio circuit judged in addition whether this second frequency band blocks.

9. signal processing circuit as claimed in claim 8, wherein if this second frequency band and unblock, then this second radio circuit carries out signal transmission by this second frequency band and this network equipment simultaneously, transmits to allow this signal processing circuit to carry out signal by this first frequency band and this second frequency band and this network equipment simultaneously.

10. signal processing circuit as claimed in claim 8, wherein if this second frequency band is in the time of obstruction greater than a scheduled time length, then this second frequency synthesizer system switches to and produces this first frequency, carries out the signal transmission by this first frequency band and this access point simultaneously to allow this first radio circuit and second radio circuit.

11. signal processing circuit as claimed in claim 8, wherein this second radio circuit includes:

One signal energy estimation module is used for detecting the energy of this second radiofrequency signal;

Wherein if the energy of this second radiofrequency signal less than a predetermined threshold, then this second radio circuit is judged this second frequency band and unblock.

12. signal processing circuit as claimed in claim 8, wherein this second radio circuit detects the carrier wave detection ratio of this second frequency band in addition, if this carrier wave detects ratio less than a predetermined value, then this second radio circuit is judged this second frequency band and unblock.

13. signal processing circuit as claimed in claim 2, wherein when this first radio circuit and this access point carry out the signal transmission by this first frequency band, a transmission time of the entrained at least one bag of this first digital signal is detected by this baseband circuit system, if this transmission time is during less than a predetermined threshold, this second frequency synthesizer system switches to and produces this first frequency, so that second radio circuit and this access point carry out the signal transmission by this first frequency band and this access point simultaneously.

14. signal processing circuit as claimed in claim 2, wherein this network equipment is an access point.

15. signal processing circuit as claimed in claim 2, wherein the status transmission of this second frequency band detects in this baseband circuit system, if the status transmission of this second frequency band meets a predetermined condition, then this baseband circuit judges that this second frequency band is in blocked state.

16. signal processing circuit as claimed in claim 1, it is to be applied to wireless network, is used for carrying out the signal transmission by this first frequency band and one first network equipment, or carries out the signal transmission by this second frequency band and one second network equipment.

17. signal processing circuit as claimed in claim 16, wherein when this first radio circuit and this first network equipment carry out the signal transmission by this first frequency band, this baseband circuit detects a transmission time of the entrained at least one bag of this first digital signal in addition, if this transmission time is greater than scheduled time during length, this baseband circuit estimates in addition whether this second frequency band blocks, if this second frequency band and unblock, then this first frequency synthesizer system switches to and produces this second frequency, so that this first radio circuit carries out the signal transmission by this second frequency band and this second network equipment.

18. signal processing circuit as claimed in claim 17, wherein this baseband circuit includes:

19. signal processing circuit as claimed in claim 17, wherein this baseband circuit detects the carrier wave detection ratio of this second frequency band in addition, if this carrier wave detects ratio less than a predetermined value, then this baseband circuit is judged this second frequency band and unblock.

20. signal processing circuit as claimed in claim 16, wherein when this first radio circuit and this first network equipment carry out the signal transmission by this first frequency band, this baseband circuit detects a transmission time of the entrained at least one bag of this first digital signal in addition, if this transmission time is greater than scheduled time during length, this second radio circuit estimates in addition whether this second frequency band blocks, if this second frequency band and unblock, then this first frequency synthesizer system switches to and produces this second frequency, so that this first radio circuit carries out the signal transmission by this second frequency band and this second network equipment.

21. signal processing circuit as claimed in claim 20, wherein this second radio circuit includes:

22. signal processing circuit as claimed in claim 20, wherein this second radio circuit detects the carrier wave detection ratio of this second frequency band in addition, if this carrier wave detects ratio less than a predetermined value, then this second radio circuit is judged this second frequency band and unblock.

23. signal processing circuit as claimed in claim 16, wherein this first network equipment and this second network equipment are all an access point.

24. a signal processing circuit, it includes:

One baseband circuit is used for producing one first digital signal and one second digital signal;

One first analog front circuit is coupled to this baseband circuit, is used for receiving this first digital signal, and this first digital signal is converted to one first internal signal;

One first frequency synthesizer is used for producing a first frequency;

One first radio circuit is coupled to this first frequency synthesizer and this first analog front circuit, is used for according to this first frequency, this first internal signal is converted to one first radiofrequency signal of corresponding one first frequency band;

One second analog front circuit is coupled to this baseband circuit, is used for receiving this second digital signal, and this second digital signal is converted to one second internal signal;

One second frequency synthesizer is used for producing a second frequency; And

One second radio circuit is coupled to this second frequency synthesizer and this second analog front circuit, is used for according to this second frequency, this second internal signal is converted to one second radiofrequency signal of corresponding one second frequency band;

25. signal processing circuit as claimed in claim 24, it is to be applied to wireless network, is used for carrying out the signal transmission by this first frequency band or this second frequency band and a network equipment.

26. the described signal processing circuit of claim 25, wherein when this first radio circuit and this network equipment carried out the signal transmission by this first frequency band, this baseband circuit judged in addition whether this second frequency band blocks.

27. the described signal processing circuit of claim 26, wherein if this second frequency band and unblock, then this second radio circuit carries out signal transmission by this second frequency band and this network equipment simultaneously, transmits to allow this signal processing circuit to carry out signal by this first frequency band and this second frequency band and this network equipment simultaneously.

28. signal processing circuit as claimed in claim 26, wherein if this second frequency band is in the time of obstruction greater than a scheduled time length, then this second frequency synthesizer system switches to and produces this first frequency, carries out the signal transmission by this first frequency band and this network equipment simultaneously to allow this first radio circuit and second radio circuit.

29. signal processing circuit as claimed in claim 26, wherein the status transmission of this second frequency band detects in this baseband circuit system, if the status transmission of this second frequency band meets a predetermined condition, then this baseband circuit judges that this second frequency band is in blocked state.

30. the described signal processing circuit of claim 26, wherein this baseband circuit includes:

31. signal processing circuit as claimed in claim 26, wherein this baseband circuit detects the carrier wave detection ratio of this second frequency band in addition, if this carrier wave detects ratio less than a predetermined value, then this baseband circuit is judged this second frequency band and unblock.

32. signal processing circuit as claimed in claim 25, wherein when this first radio circuit and this network equipment carried out the signal transmission by this first frequency band, this second radio circuit judged in addition whether this second frequency band blocks.

33. signal processing circuit as claimed in claim 32, wherein if this second frequency band and unblock, then this second radio circuit carries out signal transmission by this second frequency band and this network equipment simultaneously, transmits to allow this signal processing circuit to carry out signal by this first frequency band and this second frequency band and this network equipment simultaneously.

34. signal processing circuit as claimed in claim 32, wherein if this second frequency band is in the time of obstruction greater than a scheduled time length, then this second frequency synthesizer system switches to and produces this first frequency, carries out the signal transmission by this first frequency band and this access point simultaneously to allow this first radio circuit and second radio circuit.

35. signal processing circuit as claimed in claim 32, wherein this second radio circuit includes:

36. signal processing circuit as claimed in claim 32, wherein this second radio circuit detects the carrier wave detection ratio of this second frequency band in addition, if this carrier wave detects ratio less than a predetermined value, then this second radio circuit is judged this second frequency band and unblock.

37. signal processing circuit as claimed in claim 25, wherein when this first radio circuit and this access point carry out the signal transmission by this first frequency band, a transmission time of the entrained at least one bag of this first digital signal is detected by this baseband circuit system, if this transmission time is during less than a predetermined threshold, this second frequency synthesizer system switches to and produces this first frequency, so that second radio circuit and this access point carry out the signal transmission by this first frequency band and this access point simultaneously.

38. signal processing circuit as claimed in claim 25, wherein this network equipment is an access point.

39. signal processing circuit as claimed in claim 24, it is to be applied to wireless network, is used for carrying out the signal transmission by this first frequency band and one first network equipment, or carries out the signal transmission by this second frequency band and one second network equipment.

40. signal processing circuit as claimed in claim 39, wherein when this first radio circuit and this first network equipment carry out the signal transmission by this first frequency band, this baseband circuit detects a transmission time of the entrained at least one bag of this first digital signal in addition, if this transmission time is greater than scheduled time during length, this baseband circuit estimates in addition whether this second frequency band blocks, if this second frequency band and unblock, then this first frequency synthesizer system switches to and produces this second frequency, so that this first radio circuit carries out the signal transmission by this second frequency band and this second network equipment.

41. signal processing circuit as claimed in claim 40, wherein this baseband circuit includes:

42. signal processing circuit as claimed in claim 40, wherein this baseband circuit detects the carrier wave detection ratio of this second frequency band in addition, if this carrier wave detects ratio less than a predetermined value, then this baseband circuit is judged this second frequency band and unblock.

43. signal processing circuit as claimed in claim 39, wherein when this first radio circuit and this first network equipment carry out the signal transmission by this first frequency band, this baseband circuit detects a transmission time of the entrained at least one bag of this first digital signal in addition, if this transmission time is greater than scheduled time during length, this second radio circuit estimates in addition whether this second frequency band blocks, if this second frequency band and unblock, then this first frequency synthesizer system switches to and produces this second frequency, so that this first radio circuit carries out the signal transmission by this second frequency band and this second network equipment.

44. signal processing circuit as claimed in claim 43, wherein this second radio circuit includes:

45. signal processing circuit as claimed in claim 43, wherein this second radio circuit detects the carrier wave detection ratio of this second frequency band in addition, if this carrier wave detects ratio less than a predetermined value, then this second radio circuit is judged this second frequency band and unblock.

46. signal processing circuit as claimed in claim 25, wherein this first network equipment and this second network equipment are all an access point.

47. a signal processing circuit, it includes:

One first frequency synthesizer is used for producing a first frequency;

One baseband circuit is coupled to this first analog front circuit, is used for handling this first digital signal, and is used for producing one second digital signal;

One second analog front circuit is coupled to this baseband circuit, is used for receiving this second digital signal, and produces one second internal signal according to this second digital signal;

One second frequency synthesizer is used for producing a second frequency; And

One second radio circuit is coupled to this second analog front circuit, is used for receiving this second internal signal, and according to this second frequency and this second internal signal, produces one second radiofrequency signal of corresponding one second frequency band;

48. signal processing circuit as claimed in claim 47, wherein this first radio circuit system receives this first radiofrequency signal from a network equipment, and this second radio circuit be used for output to should second radiofrequency signal to this network equipment, carry out transmitted in both directions to allow this signal processing circuit and this network equipment by this first frequency band and this second frequency band and this network equipment.

49. a wireless signal treatment circuit, it is used for carrying out the signal transmission with a network equipment, and this network equipment is supported the signal transmission of one first frequency band and one second frequency band, and this signal processing circuit includes:

One first signal transmission module, it is used for carrying out the signal transmission by this first frequency band and this network equipment;

Whether one detection module is used for detecting this second frequency band and blocks, and produce a testing result; And

One secondary signal transport module, be used for when this testing result is represented this second frequency band and unblock, carry out signal transmission by this second frequency band and this network equipment, this signal processing circuit is carried out signal with this first frequency band and this second frequency band and this network equipment respectively simultaneously and is transmitted by this.

50. signal processing circuit as claimed in claim 49, wherein the status transmission of this second frequency band detects in this detection module system, if the status transmission of this second frequency band meets a predetermined condition, then this baseband circuit judges that this second frequency band is in blocked state, and produces this testing result.

51. signal processing circuit as claimed in claim 49, wherein this detection module includes:

One signal energy estimation module is used for estimating the signal energy of this second frequency band;

Wherein the signal energy of working as this second frequency band is less than a predetermined threshold, and this second frequency band and unblock are judged by this detection module system.

52. signal processing circuit as claimed in claim 49, wherein this detection module is that the carrier wave that calculates this second frequency band detects ratio, if this carrier wave detects ratio less than a predetermined value, then this detection module is judged this second frequency band and unblock.

53. signal processing circuit as claimed in claim 49, it also includes:

One transmission time detection module, be coupled to this first signal transmission module, be used for when this first signal transmission module and this network equipment carry out the signal transmission by this first frequency band, detect a transmission time of at least one bag, if this transmission time is during less than a predetermined threshold, then this secondary signal transport module carries out signal by this first frequency band and this network equipment simultaneously and transmits.

54. signal processing circuit as claimed in claim 49, wherein this first signal transmission module includes:

One first frequency synthesizer is used for producing a first frequency;

One first radio circuit is coupled to this first frequency synthesizer, is used for according to this first frequency, receives one first radiofrequency signal that should first frequency band, and produces one first internal signal according to this first radiofrequency signal; And

And this secondary signal transport module includes:

One second frequency synthesizer is used for producing a second frequency or this first frequency;

One second radio circuit is coupled to this second frequency synthesizer, is used for according to this second frequency/first frequency, receives one second radiofrequency signal that should second frequency band/this first frequency band, and produces one second internal signal according to this second radiofrequency signal; And

One second analog front circuit is coupled to this second radio circuit, is used for receiving this second internal signal, to produce one second digital signal according to this second internal signal;

Wherein the centre frequency of this first frequency band equals this first frequency, and the centre frequency of this second frequency band equals this second frequency, and this signal processing circuit also includes a baseband circuit, is used for handling this first digital signal and this second digital signal.

55. signal processing circuit as claimed in claim 54, wherein this detection module includes:

One signal energy estimation module is used for estimating the signal energy of this second digital signal;

Wherein the signal energy of working as this second digital signal is less than a predetermined threshold, and this second frequency band and unblock are judged by this detection module system.

56. signal processing circuit as claimed in claim 54, wherein this detection module includes:

One signal energy estimation module is used for estimating the signal energy of this second radiofrequency signal;

Wherein the signal energy of working as this second radiofrequency signal is less than a predetermined threshold, and this second frequency band and unblock are judged by this detection module system.

57. signal processing circuit as claimed in claim 49, it also includes:

Wherein this first signal transmission module includes:

One first frequency synthesizer is used for producing a first frequency; And

One first radio circuit is coupled to this first frequency synthesizer and this first analog front circuit, is used for according to this first frequency, and this first internal signal is converted to one first radiofrequency signal that should first frequency band;

And this secondary signal transport module includes:

One second frequency synthesizer is used for producing a second frequency or this first frequency; And

One second radio circuit is coupled to this second frequency synthesizer and this second analog front circuit, is used for according to this second frequency/this first frequency, and this second internal signal is converted to one second radiofrequency signal that should second frequency band/this first frequency band;

58. signal processing circuit as claimed in claim 57, wherein this detection module includes:

59. signal processing circuit as claimed in claim 57, wherein this detection module includes:

60. signal processing circuit as claimed in claim 49, wherein this network equipment is an access point.

61. wireless signal treatment circuit, it is used for carrying out the signal transmission with one first network equipment or one second network equipment, this first network equipment is supported the signal transmission of one first frequency band, and this second network equipment is supported the signal transmission of one second frequency band, and this signal processing circuit includes:

One first signal transmission module, it is used for carrying out the signal transmission by this first frequency band or this second frequency band;

One secondary signal transport module, it is used for carrying out the signal transmission by this second frequency band; And

Whether one first detection module is coupled to this first signal transmission module, be used for being detected on this first frequency band and blocking, and produce one first testing result when this first signal transmission module and this first network equipment carry out the signal transmission by this first frequency band;

Whether one second detection module is coupled to this secondary signal transport module, be used for detecting this second frequency band and blocking, to produce one second testing result when this first frequency band blocks;

Wherein represents this first frequency band and block, and this second testing result represents this second frequency band and unblock that then this first signal transmission module system switches to and carries out signal by this second frequency band and this second network equipment and transmit when this first testing result.

62. signal processing circuit as claimed in claim 61, wherein the status transmission of this first frequency band detects in this first detection module system, if the status transmission of this first frequency band meets a predetermined condition, then this first detection module judges that this first frequency band is in blocked state.

63. signal processing circuit as claimed in claim 61, wherein the status transmission of this second frequency band detects in this second detection module system, if the status transmission of this second frequency band meets a predetermined condition, then this second detection module judges that this second frequency band is in blocked state.

64. signal processing circuit as claimed in claim 61, wherein first detection module includes:

One transmission time detection module, be used for detecting when this first signal transmission module and this first network equipment and carry out signal when transmitting by this first frequency band, be detected on a transmission time of at least one bag of this first frequency band transmission, if this transmission time, then this first detection module judged that this first frequency band blocks greater than a scheduled time length.

65. signal processing circuit as claimed in claim 61, wherein this second detection module includes:

Wherein the signal energy of working as this second frequency band is less than a predetermined threshold, and this second frequency band and unblock are judged by this second detection module system.

66. signal processing circuit as claimed in claim 61, wherein this second detection module is that the carrier wave that calculates this second frequency band detects ratio, if this carrier wave detects ratio less than a predetermined value, then this second detection module is judged this second frequency band and unblock.

67. signal processing circuit as claimed in claim 61, wherein this first signal transmission module includes:

One first frequency synthesizer is used for producing a first frequency or a second frequency, and wherein the centre frequency of this first frequency band equals this first frequency, and the centre frequency of this second frequency band equals this second frequency;

One first radio circuit, be coupled to this first frequency synthesizer, be used for this first frequency/this second frequency of being produced according to this first frequency synthesizer, receive one first radiofrequency signal that should first frequency band/this second frequency band, and produce one first internal signal according to this first radiofrequency signal; And

This secondary signal transport module includes:

One second frequency synthesizer is used for producing this second frequency;

One second radio circuit is coupled to this second frequency synthesizer, is used for according to this second frequency, receives one second radiofrequency signal that should second frequency band, and produces one second internal signal according to this second radiofrequency signal; And

This signal processing circuit also includes a baseband circuit, is used for handling this first digital signal and this second digital signal.

68. as the described signal processing circuit of claim 67, wherein this second detection module includes:

One signal energy estimation module is used for the signal energy of this second digital signal;

Wherein the signal energy of working as this second digital signal is less than a predetermined threshold, and this second frequency band and unblock are judged by this second detection module system.

69. as the described signal processing circuit of claim 67, wherein this second detection module includes:

One signal energy estimation module is used for the signal energy of this second radiofrequency signal;

Wherein the signal energy of working as this second radiofrequency signal is less than a predetermined threshold, and this second frequency band and unblock are judged by this second detection module system.

70. signal processing circuit as claimed in claim 61, it also includes:

Wherein this first signal transmission module includes:

One first frequency synthesizer is used for producing a first frequency or a second frequency, and wherein the centre frequency of this first frequency band equals this first frequency, and the centre frequency of this second frequency band equals this second frequency; And

One first radio circuit, be coupled to this first frequency synthesizer and this first analog front circuit, be used for this first frequency/this second frequency of being produced according to this first frequency synthesizer, this first internal signal is converted to one first radiofrequency signal that should first frequency band/this second frequency band;

And this secondary signal transport module includes:

One second frequency synthesizer is used for producing this second frequency; And

One second radio circuit is coupled to this second frequency synthesizer and this second analog front circuit, is used for according to this second frequency, and this second internal signal is converted to one second radiofrequency signal that should second frequency band.

71. as the described signal processing circuit of claim 70, wherein this second detection module includes:

72. as the described signal processing circuit of claim 70, wherein this second detection module includes:

73. signal processing circuit as claimed in claim 61, wherein this first network equipment and this second network equipment are all an access point.