CN100525123C - Receiver and wireless signal receiving method - Google Patents

Abstract

Under the control of analog auto gain control signal AAGC, this means handles the gain-changing process against the analog band-pass signal input to the receiver, does digital sampling to gain the digital band-pass signal, then splits this signal into two ways, the feedback branch and the forward branch, then tests the real signal envelope power of digital band-pass signal on the feedback branch to gain the envelop power, then produces the control signal AAGC using the gained envelope power. Finally, it handles digital process against the digital band-pass signal on the forward branch to gain the bit flow. Due to this means calculates directly the envelope power using a few sample values of the digital sampled real signal without needing lots of sample values and not calculating the power after the digital filter, the AAGC loop delay is reduced and the AAGC control ability is raised. An instant AAGC control against wide-band signal can be carried out.

Description

The method of a kind of receiver and reception wireless signal

Technical field

The present invention relates to the wireless receiving technology, particularly relate to the method for a kind of receiver and reception wireless signal.

Background technology

In wireless communication system or radar system, need receive wireless signal by certain device, this device is commonly referred to wireless receiver or receiver.The kind of receiver has a lot, and dynamic range is to weigh an important index of receiver quality.

The dynamic range of receiver generally is divided into dynamic range and non-while dynamic range simultaneously.Wherein, simultaneously dynamic range is under large-signal and the simultaneous situation of small-signal, and receiver can simultaneously correct demodulation large-signal and the ability of small-signal, and its value is generally the maximum of large-signal and small signal power ratio.But not simultaneously dynamic range is the correctly demodulation ability of the signal of fluctuations in time of receiver, and its value is generally the ratio of the maximum signal power and the minimum signal power of fluctuations.Generally dynamic range is big simultaneously than it for the non-while dynamic range of receiver, this is because if import simultaneously when large-signal and small-signal, and correctly demodulation of receiver is so when large-signal with small-signal is non-imports simultaneously, owing to do not have the problem of phase mutual interference, just more correctly demodulation of receiver.In the reality, receiver can utilize simulation automatic gain control (AAGC) technology to reach the purpose of the non-while dynamic range of expansion.

At present, the AAGC technology generally can be divided into two classes: a class is that road technique is propped up in monotropic gain, another kind ofly props up road technique for many fixed gains.

Wherein, the thought that road technique is propped up in monotropic gain is to adopt a branch road to transmit or handle received signal, but the gain of this branch road is variable.

Fig. 1 has shown and a kind ofly in the prior art utilizes monotropic gain branch road to receive the basic block diagram of the receiver of wireless signal.As shown in Figure 1, this receiver comprises: variable-gain simulation receiving channel module 101, analog to digital modular converter 102, real signal average power detection module 103, AAGC control module 104, Digital Down Converter Module 105, digital filter 106, back stages of digital processing module 107.

Wherein, variable-gain simulation receiving channel module 101 generally comprises multistage mixing, filtration module and amplification module etc., and can change its gain under the control of power detection and AAGC control module;

Analog to digital modular converter 102, the analog bandpass conversion of signals that is used for input is the digital band pass signal.

Real signal average power detection module 103 is used for the real signal by 102 inputs of analog to digital modular converter is averaged power detection, and detected average power is exported to AAGC control module 104.

AAGC control module 104 is used for changing the gain size of variable-gain simulation receiving channel module 101 then according to determining the gain configuration by the signal power value of real signal average power detection module 103 inputs under the control of demodulation synchronization signal.

Digital Down Converter Module 105, being used for to be the position of 0 frequency to centre frequency by the frequency spectrum shift of the digital band pass signal of analog to digital modular converter 102 input.The signal of moving 0 frequency location is divided into two parallel branches in I road and Q road, and these two parallel branches are collectively referred to as complex signal or digital I﹠amp; Q signal, and be exported to digital filter 106.

Digital filter 106 is used for the digital I﹠amp by Digital Down Converter Module 105 inputs; Q signal carries out low-pass filtering treatment and output.The digital I﹠amp of the process low-pass filtering of output; Q signal is called baseband signal, can reflect the situation of bandpass signal envelope variation, so generally be otherwise known as digital complex envelope signal or complex envelope signal.

Back stages of digital processing module 107 is used for complex envelope signal or baseband signal are carried out back stages of digital processing, as: processing such as filtering, extraction, demodulation, output bit flow then.

Fig. 2 has realized that another kind utilizes monotropic gain branch road to receive the basic block diagram of the receiver of wireless signal in the prior art.As shown in Figure 2, this receiver comprises variable-gain simulation receiving channel module 101, analog to digital modular converter 102, complex signal envelope power detection module 203, AAGC control module 104, Digital Down Converter Module 105, digital filter 106, back stages of digital processing module 107.

Wherein, variable-gain is simulated receiving channel module 101, analog to digital modular converter 102, AAGC control module 104, Digital Down Converter Module 105, digital filter 106, afterwards stages of digital processing module 107 is identical with corresponding module among Fig. 1, different is, this receiver comprises complex signal envelope power detection module 203, and is according to the digital I﹠amp from digital filter 106 inputs; Q signal carries out detecting based on the envelope power of complex signal.

In Fig. 1, variable-gain simulation receiving channel module 101, analog to digital modular converter 102, real signal average power detection module 103, AAGC control module 104 have constituted a feedback control loop; In Fig. 2, variable-gain simulation receiving channel module 101, analog to digital modular converter 102, Digital Down Converter Module 105, digital filter 106, complex signal envelope power detection module 203, AAGC control module 104 have also constituted a feedback control loop.

In the practical application, the time-delay of the loop of AAGC is an important indicator of weighing receiver performance.In first kind of prior art, because the average power detection method that is based on real signal that adopts needs a segment signal, the sampling point that is generally more than 100 could obtain average power, so nature can cause inevitable loop time-delay.Second kind of prior art, only need a sampling point to get final product though obtain envelope power from complex signal, but after digital filter, just begin to carry out envelope detected, and digital filter is that certain time-delay is arranged, so also caused inevitable loop time-delay.

So, no matter be first kind or second kind of prior art, the time-delay of AAGC loop is all long, when AAGC starts to control according to the result of power detection, input signal power may be not the power of detected signal, this makes dynamically still bigger through the signal after the AAGC control, and the effect that causes AAGC to control weakens even loses the effect that AAGC controls, and is difficult to guarantee that the receiver output signal is undistorted.In addition,, will be difficult to the signal in big broadband is carried out transient state AAGC control, be difficult to equally also guarantee that the receiver output signal is undistorted because the time-delay of AAGC loop is long.Transient state AAGC control described here is meant that AAGC control follows signal closely and changes, when becoming big, signal amplitude just increases the decay of variable-gain simulation receive path, just reduce the decay of variable-gain simulation receive path when signal amplitude diminishes, thereby make the output of variable-gain simulation receive path maintain a desirable level all the time.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of receiver, can reduce the time-delay of AAGC loop, strengthens the control ability of AAGC to the receiver input signal.

The present invention also proposes a kind of method that receives wireless signal, can reduce the time-delay of AAGC loop, strengthens the control ability of AAGC to the receiver input signal.

At first goal of the invention, the technical scheme that the present invention proposes is:

A kind of receiver comprises variable-gain simulation receiving channel module and digital signal processing module;

Described variable-gain simulation receiving channel module is used for carrying out variable-gain according to the analog bandpass signal of receiver being imported by the AAGC control signal of AAGC control module input and handles, and exports to the analog to digital modular converter;

Described digital signal processing module is used for the digital band pass signal by the input of analog to digital modular converter is carried out digital processing, obtains and output bit flow;

This receiver also comprises: analog to digital modular converter, real signal envelope power detection module, AAGC control module; Wherein,

Described analog to digital modular converter is used for that the analog bandpass signal by the input of variable-gain simulation receiving channel module is carried out digital sample and handles, and obtains the digital band pass signal, and exports to real signal envelope power detection module and digital signal processing module;

Described real signal envelope power detection module is used for obtaining envelope power according to the current sample value of the digital band pass signal of being imported by the analog to digital modular converter and the sample value that before continues, and exports to the AAGC control module; The sample value that continues before described is previous sample value or preceding two sample value of current sampling point;

Described AAGC control module is used for producing the AAGC control signal according to determining the AAGC controlled quentity controlled variable by the envelope power of real signal envelope power detection module input by the AAGC controlled quentity controlled variable of determining, and exports to variable-gain simulation receiving channel module.

In the such scheme, described digital signal processing module comprises: Digital Down Converter Module, digital filtering module and back stages of digital processing module; Wherein,

Described Digital Down Converter Module is used for the digital band pass signal by the input of analog to digital modular converter is carried out down-converted, obtains digital I﹠amp; Q signal, and export to digital filtering module;

Described digital filtering module is used for the digital I﹠amp by the Digital Down Converter Module input; Q signal carries out low-pass filtering treatment, obtains digital baseband signal, and exports to back stages of digital processing module;

Back stages of digital processing module is used for handling carried out the back stages of digital by digital filtering module, obtains and output bit flow.

In the such scheme, this receiver further comprises:

AAGC amplitude compensating module is used for according to the change in gain by the input of AAGC control module, the signal by the input of analog to digital modular converter is carried out the amplitude compensation, and export to Digital Down Converter Module;

Described AAGC control module is further used for: preserve the gain compensation table that is used to write down corresponding relation between AAGC controlled quentity controlled variable and the change in gain, determine change in gain according to AAGC controlled quentity controlled variable and gain compensation table, and the change in gain of determining is exported to AAGC amplitude compensating module.

In the such scheme, this receiver further comprises:

AAGC amplitude compensating module is used for according to the change in gain by the input of AAGC control module, the signal by the Digital Down Converter Module input is carried out the amplitude compensation, and export to the digital filter module;

Described AAGC control module is further used for: preserve the gain compensation table that is used to write down corresponding relation between AAGC controlled quentity controlled variable and the change in gain, determine change in gain according to AAGC controlled quentity controlled variable and gain compensation table, and the change in gain of determining is exported to AAGC amplitude compensating module.

In the such scheme, this receiver further comprises:

AAGC amplitude compensating module is used for according to the change in gain by the input of AAGC control module, and the digital baseband signal by the digital filtering module input is carried out the amplitude compensation, and exports to back stages of digital processing module;

Described AAGC control module is further used for: preserve the gain compensation table that is used to write down corresponding relation between AAGC controlled quentity controlled variable and the change in gain, determine change in gain according to AAGC controlled quentity controlled variable and gain compensation table, and the change in gain of determining is exported to AAGC amplitude compensating module.

In the such scheme, this receiver further comprises:

The AAGC phase compensation block is used for according to the phase change by the input of AAGC control module, to the digital I﹠amp by the Digital Down Converter Module input; Q signal carries out phase compensation, and exports to digital filtering module;

Described AAGC control module is further used for: preserve the phase compensation table that is used to write down corresponding relation between AAGC controlled quentity controlled variable and the phase change, determine phase change according to AAGC controlled quentity controlled variable and phase compensation table, and the phase change of determining is exported to the AAGC phase compensation block.

In the such scheme, this receiver further comprises:

The AAGC phase compensation block is used for according to the phase change by the input of AAGC control module, and the digital baseband signal by the digital filtering module input is carried out phase compensation, and exports to back stages of digital processing module;

Described AAGC control module is further used for: preserve the phase compensation table that is used to write down corresponding relation between AAGC controlled quentity controlled variable and the phase change, determine phase change according to AAGC controlled quentity controlled variable and phase compensation table, and the phase change of determining is exported to the AAGC phase compensation block.

In the such scheme, described Digital Down Converter Module comprises DDC multiplier and digital controlled oscillator NCO, and described NCO is further used for: according to the phase change by the input of AAGC control module, by changing the first phase of NCO, carry out phase compensation, and export to the DDC multiplier;

Described AAGC control module is further used for: preserve the phase compensation table that is used to write down corresponding relation between AAGC controlled quentity controlled variable and the phase change, determine phase change according to AAGC controlled quentity controlled variable and phase compensation table, and the phase change of determining is exported to NCO.

At second goal of the invention, the technical scheme that the present invention proposes is:

A kind of method that receives wireless signal is characterized in that, this method may further comprise the steps:

A, the analog bandpass signal with input receiver under the control of simulation automatic gain control AAGC signal carry out the variable-gain processing, carry out digital sample again, obtain the digital band pass signal;

B, the digital band pass signal that obtains is divided into feedback branch and forward direction branch road two-way, according to the current sample value of feedback branch and the sample value that before continues obtain envelope power, determine the AAGC controlled quentity controlled variable by envelope power, and then produce the AAGC control signal; The forward direction branch road is carried out digital processing, obtain bit stream; The sample value that continues before described is previous sample value or preceding two sample value of current sampling point.

In the such scheme, the method for the described digital processing of step b is: earlier the digital band pass signal is carried out Digital Down Convert and handle, obtain digital I﹠amp; Q signal; Again to digital I﹠amp; Q signal carries out digital filtering to be handled, and obtains digital baseband signal; Carrying out the back stages of digital then handles.

In the such scheme, the gain compensation table of corresponding relation between record AAGC controlled quentity controlled variable and the change in gain is set, carries out further comprising before the Digital Down Convert processing at the described digital band pass signal of step b with the forward direction branch road:

According to AAGC controlled quentity controlled variable inquiry gain compensation table, obtain the change in gain corresponding with the AAGC controlled quentity controlled variable, according to change in gain digital bandpass signal is carried out the amplitude compensation again.

In the such scheme, the gain compensation table of corresponding relation between record AAGC controlled quentity controlled variable and the change in gain is set, described Digital Down Convert processing of step b and digital filtering further comprise between handling:

According to AAGC controlled quentity controlled variable inquiry gain compensation table, obtain the change in gain corresponding with the AAGC controlled quentity controlled variable, again according to change in gain to digital I﹠amp; Q signal carries out the amplitude compensation.

In the such scheme, the gain compensation table of corresponding relation between record AAGC controlled quentity controlled variable and the change in gain is set, between described digital filtering processing of step b and back stages of digital were handled, this method further comprised:

According to AAGC controlled quentity controlled variable inquiry gain compensation table, obtain the change in gain corresponding with the AAGC controlled quentity controlled variable, according to change in gain digital baseband signal is carried out the amplitude compensation again.

In the such scheme, the phase compensation table of corresponding relation between record AAGC controlled quentity controlled variable and the phase change is set, described Digital Down Convert processing of step b and digital filtering further comprise between handling:

According to AAGC controlled quentity controlled variable inquiry phase compensation table, obtain the phase change corresponding with the AAGC controlled quentity controlled variable, again according to phase change to digital I﹠amp; Q signal carries out phase compensation.

In the such scheme, the phase compensation table of corresponding relation between record AAGC controlled quentity controlled variable and the phase change is set, between described digital filtering processing of step b and back stages of digital were handled, this method further comprised:

According to AAGC controlled quentity controlled variable inquiry phase compensation table, obtain the phase change corresponding with the AAGC controlled quentity controlled variable, according to phase change digital baseband signal is carried out phase compensation again.

In the such scheme, the phase compensation table of corresponding relation between record AAGC controlled quentity controlled variable and the phase change is set, the method that the described Digital Down Convert of step b is handled is: obtain the numerical control oscillator signal according to the pre-determined direction of rotation of NCO, frequency word and first phase, again digital band pass signal and numerical control oscillator signal are multiplied each other, obtain digital I﹠amp; Q signal;

The method of described definite NCO first phase is: according to AAGC controlled quentity controlled variable inquiry phase compensation table, obtain the phase change corresponding with the AAGC controlled quentity controlled variable earlier, determine the first phase of NCO again according to phase change.

In sum, the method of a kind of receiver that the present invention proposes and reception wireless signal, because can utilize a few sample value of the real signal after the digital sample directly calculates the envelope power of real signal, needn't obtain the average power that a large amount of sampled points calculates real signal by the time, just carry out the calculating of complex signal envelope power after also needn't waiting until digital filtering, can significantly reduce the time-delay of AAGC loop, obtain envelope power apace, strengthen the control ability of AAGC to the receiver input signal, also can carry out transient state AAGC control to the signal in big broadband, thereby can guarantee that the receiver output signal is undistorted.

In addition, amplitude and/or phase place to signal compensates if desired, can also measure the characteristic of variable-gain receive path in advance, obtain the relation between AAGC controlled quentity controlled variable and variable-gain receive path amplitude and/or the phase change, just can carry out the compensation of amplitude and/or phase place to signal then, thereby reach the not purpose of drop-out according to the AAGC controlled quentity controlled variable.

Description of drawings

Fig. 1 is the basic structure schematic diagram of receiver in first kind of prior art;

Fig. 2 is the basic structure schematic diagram of receiver in second kind of prior art;

Fig. 3 is the basic structure schematic diagram of receiver among the present invention;

Fig. 4 is a basic structure schematic diagram of using the present invention program's device embodiment one;

Fig. 5 is a basic structure schematic diagram of using the present invention program's device embodiment four;

Fig. 6 is a basic structure schematic diagram of using the present invention program's device embodiment six;

Fig. 7 is a basic structure schematic diagram of using the present invention program's device embodiment seven;

Fig. 8 is a basic structure schematic diagram of using the present invention program's device embodiment eight;

Fig. 9 is the flow chart that the present invention realizes receiving the wireless signal method;

Figure 10 is a flow chart of using the present invention program's method embodiment one;

Figure 11 is a flow chart of using the present invention program's method embodiment four;

Figure 12 is a flow chart of using the present invention program's method embodiment six;

Figure 13 is a flow chart of using the present invention program's method embodiment seven;

Figure 14 is a flow chart of using the present invention program's method embodiment eight.

Embodiment

For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with the accompanying drawings and the specific embodiments.

Key of the present invention is to have increased a real signal envelope power detection module in receiver, can be used to self simulation directly calculates real signal to several sample value seldom of data-converting block envelope power.

Fig. 3 has shown the basic structure schematic diagram of receiver among the present invention.As shown in Figure 3, the receiver among the present invention comprises variable-gain simulation receiving channel module 101, analog to digital modular converter 102, real signal envelope power detection module 303, AAGC control module 104, digital signal processing module 105.

Wherein, variable-gain simulation receiving channel module 101 is used for carrying out variable-gain according to the analog bandpass signal of receiver being imported by the AAGC control signal of AAGC control module 104 inputs and handles, and exports to analog to digital modular converter 102.

Here, described variable-gain simulation receiving channel module 101 may contain processing such as multistage mixing, filtering, amplification, and its gain can change under 104 controls of AAGC control module.

Analog to digital modular converter 102 is used for that the analog bandpass signal from 101 inputs of variable-gain simulation receiving channel module is carried out digital sample and handles, and obtains the digital band pass signal, and exports to real signal envelope power detection module 303 and digital signal processing module 105.

Real signal envelope power detection module 303 is used for obtaining envelope power according to the current sample value of the digital band pass signal of being imported by the analog to digital modular converter and the sample value that before continues, and exports to AAGC control module 104.

The sample value that continues before described here is previous sample value or preceding two sample value, that is to say, the present invention can directly calculate the current envelope power of real signal according to two sample value or three sample value, thereby can reduce the time-delay of AAGC loop.

AAGC control module 104 is used for producing the AAGC control signal by the AAGC controlled quentity controlled variable again according to determining the AAGC controlled quentity controlled variable by the envelope power of real signal envelope power detection module 303 inputs, exports to variable-gain simulation receiving channel module 101 then.

Digital signal processing module 105 is used for the digital band pass signal by 102 inputs of analog to digital modular converter is carried out digital processing, obtains and output bit flow.

In the practical application, the internal structure more complicated of digital signal processing module 105 generally comprises Digital Down Converter Module 1051, digital filtering module 1052 and back stages of digital processing module 1053.Wherein, Digital Down Converter Module 1051 is used for the digital band pass signal by the input of analog to digital modular converter is carried out down-converted, obtains digital I﹠amp; Q signal, and export to digital filtering module 1052; Digital filtering module 1052 is used for the digital I﹠amp by Digital Down Converter Module 1051 inputs; Q signal carries out low-pass filtering treatment, obtains digital baseband signal, and exports to back stages of digital processing module 1053; Back stages of digital processing module 1053 is used for handling carried out the back stages of digital by digital filtering module, as processing such as extraction, filtering, demodulation, obtains and output bit flow.In the practical application,

Among the present invention, real signal envelope power detection module 303 can be used to self simulation a few sampling point to data-converting block 102, promptly 2 sampling points or 3 sampling points directly calculate envelope power, reduce the time-delay of AAGC loop greatly, strengthen the control ability to the bandpass signal of receiver input.

In the practical application, if system adopts permanent envelope modulation, that is: information only is included in the phase change, be not included in the changes in amplitude, and the phase characteristic of variable-gain simulation receiving channel module 101 does not change with the AAGC controlled quentity controlled variable, so, signal after the control of process AAGC loop just need not the compensation of the amplitude of carrying out and/or phase place, can directly carry out digital processing and obtain bit stream.

In the practical application, if system adopts modulation systems such as QAM, OFDM, information is included in phase change and the changes in amplitude, even the phase characteristic of variable-gain simulation receiving channel module 101 does not change with the AAGC controlled quentity controlled variable, also need not lose effective information to carrying out the amplitude compensation through the signal after the control of AAGC loop.Certainly,, not only need to carry out the amplitude compensation, also need to carry out phase compensation if the phase characteristic of variable-gain simulation receiving channel module 101 changes with the AAGC controlled quentity controlled variable.

In the practical application, if system adopts modes such as GMSK phase modulated, information only is included in the phase change, and be not included in the changes in amplitude, and the phase characteristic of variable-gain simulation receiving channel module 101 changes with the AAGC controlled quentity controlled variable, just needs separately phase place to be compensated not lose effective information.

For the present invention program is described better, the 26S Proteasome Structure and Function of receiver among the present invention is described with embodiment below.

Device embodiment one

In the present embodiment, system adopts permanent envelope modulation, and information is included in changes in amplitude and the phase change, and the phase characteristic of variable-gain simulation receiving channel module 101 does not change with the AAGC controlled quentity controlled variable.Fig. 4 has shown the basic structure schematic diagram of receiver in the present embodiment.As shown in Figure 4, the receiver of present embodiment comprises: variable-gain simulation receiving channel module 101, analog to digital modular converter 102, real signal envelope power detection module 303, AAGC control module 104, digital signal processing module 105.Wherein, digital signal processing module 105 also comprises: Digital Down Converter Module 1051, digital filtering module 1052, back stages of digital processing module 1053, AAGC amplitude compensating module 1054.

In this enforcement among the 26S Proteasome Structure and Function of module and Fig. 3 corresponding module basic identical, different is: described AAGC control module 104 is further used for: preserve the gain compensation table that is used to write down corresponding relation between AAGC controlled quentity controlled variable and the change in gain, determine change in gain according to AAGC controlled quentity controlled variable and gain compensation table, and the change in gain of determining is exported to AAGC amplitude compensating module 1054.

Described AAGC amplitude compensating module 1054 is used for according to the change in gain by 104 inputs of AAGC control module, the signal by 102 inputs of analog to digital modular converter is carried out the amplitude compensation, and export to Digital Down Converter Module 1051.

In the present embodiment, variable-gain simulation receiving channel module 101, analog to digital modular converter 102, real signal envelope power detection module 303, AAGC control module 104 constitute a feedback loop, produce the AAGC control signal and in real time current demand signal is carried out AAGC control, change the gain of analog bandpass signal, the signal of variable-gain simulation receiving channel module 101 outputs is maintained on the desirable level all the time, reduce the dynamic of signal.

Receive the analog bandpass signal of input when receiver after, variable-gain simulation receiving channel module 101 analog bandpass signal to input under the control of AAGC control module 104 carries out the variable-gain processing, and exports to analog to digital modular converter 102; 102 pairs of analog bandpass signals from 101 inputs of variable-gain simulation receiving channel module of analog to digital modular converter carry out digital sample to be handled, the digital band pass signal that will obtain after will sampling again is divided into feedback branch and forward direction branch road two-way, feedback branch is exported to real signal envelope power detection module 303, and the front branch road is exported to AAGC amplitude compensating module 1054; Real signal envelope power detection module 303 is according to a current sampling point and a last sampling point from 102 inputs of analog to digital modular converter, perhaps current sampling point and last two sampling points carry out the real signal envelope power and detect, obtain envelope power, and export to AAGC control module 104; AAGC control module 104 is according to determining the AAGC controlled quentity controlled variable from the envelope power of real signal envelope power detection module 303 inputs, produce the AAGC control signal according to the AAGC controlled quentity controlled variable on the one hand, and export to variable-gain and simulate receiving channel module 101, inquire about the gain compensation table that is kept at self according to the AAGC controlled quentity controlled variable on the other hand, obtain change in gain, and export to AAGC amplitude compensating module 1054; AAGC amplitude compensating module 1054 carries out the amplitude compensation according to the change in gain from AAGC control module 104 to the digital band pass signal from 102 inputs of analog to digital modular converter, exports to Digital Down Converter Module 1051 again; Digital Down Converter Module 1051 is carried out down-converted to the digital band pass signal of input again, is the position of 0 frequency with frequency spectrum shift to centre frequency, obtains digital I﹠amp; Q signal, and export to digital filtering module 1052; 1052 couples of digital I﹠amp of digital filtering module from Digital Down Converter Module 1051 inputs; Q signal carries out low-pass filtering treatment, obtains digital baseband signal, and exports to back stages of digital processing module 1053; Back stages of digital processing module 1053 is made the back stages of digital to digital baseband signal again and is handled, and as extraction, filtering, demodulation etc., obtains and output bit flow.

Device embodiment two

Based on device embodiment one, in the practical application, also can between Digital Down Convert processing and digital filtering processing, carry out the amplitude compensation.

That is to say that in the present embodiment, AAGC amplitude compensating module 1054 is used for the digital I﹠amp of change in gain to importing from Digital Down Converter Module 1051 according to 104 inputs of AAGC control module; Q signal carries out the amplitude compensation, and exports to digital filtering module 1052.

The function of other module is identical with corresponding module among the device embodiment one with structure in the present embodiment, no longer is described in detail herein.

Device embodiment three

Based on device embodiment one, in the practical application, also can between digital filtering processing and back stages of digital processing, carry out the amplitude compensation.

That is to say that in the present embodiment, AAGC amplitude compensating module 1054 is used for according to the change in gain of AAGC control module 104 inputs the digital baseband signal from digital filtering module 1052 inputs being carried out the amplitude compensation, and exports to back stages of digital processing module 1053.

The function of other module is identical with corresponding module among the device embodiment one with structure in the present embodiment, no longer is described in detail herein.

In the practical application, amplitude compensation can realize with digital multiplier, and present embodiment is owing to carry out the amplitude compensation digital filtering after, can reduce the burden that is used to the digital multiplier that the amplitude of carrying out compensates.

Device embodiment four

Fig. 5 has shown the basic structure schematic diagram of receiver in the present embodiment.In the present embodiment, system adopts the GMSK phase modulation method, and signal only is included in the phase change, and the phase characteristic of variable-gain simulation receiving channel module 101 changes with the AAGC controlled quentity controlled variable.

As shown in Figure 5, present embodiment comprises: variable-gain simulation receiving channel module 101, analog to digital modular converter 102, real signal envelope power detection module 303, AAGC control module 104, digital signal processing module 105.Wherein, digital signal processing module 105 also comprises: Digital Down Converter Module 1051, digital filtering module 1052, AAGC phase compensation block 1055, back stages of digital processing module 1053.

In this enforcement among the 26S Proteasome Structure and Function of module and Fig. 3 corresponding module basic identical, different is: described AAGC control module 104 is further used for: preserve the phase compensation table that is used to write down corresponding relation between AAGC controlled quentity controlled variable and the phase change, determine phase change according to AAGC controlled quentity controlled variable and phase compensation table, and the phase change of determining is exported to AAGC phase compensation block 1055.

Described AAGC phase compensation block 1055 is used for according to the phase change by 104 inputs of AAGC control module, and the digital baseband signal by digital filtering module 1052 inputs is carried out phase compensation, and exports to back stages of digital processing module 1053.

Device embodiment five

Based on device embodiment four, in the practical application, also can between Digital Down Convert processing and digital filtering processing, carry out phase compensation.

That is to say that described AAGC phase compensation block 1055 is used for according to the phase change by 104 inputs of AAGC control module, to the digital I﹠amp by Digital Down Converter Module 1051 inputs; Q signal carries out phase compensation, and exports to digital filtering module 1052.

Other module is identical with corresponding module among the device embodiment four in the present embodiment, repeats no more herein.

Device embodiment six

In the practical application, also can directly utilize the NCO in the Digital Down Converter Module to carry out phase compensation.NCO generally comprises 3 configuration parameters, that is: direction of rotation, frequency word and first phase, NCO is according to these three parameter generating numerical control oscillator signals, and export to the DDC multiplier, the DDC multiplier will multiply each other from the digital band pass signal of analog to digital modular converter 102 inputs and the numerical control oscillator signal of importing from NCO again, carry out Digital Down Convert and handle, with the frequency spectrum shift of digital band pass signal position, obtain digital I﹠amp to 0 frequency; Q signal, and export to digital filtering module 1052.Wherein, this parameter of first phase can be determined the phase place of numerical control oscillator signal among the NCO, influences digital I﹠amp then; The phase place of Q signal.So, in the practical application, can directly realize phase compensation by this parameter of first phase that changes NCO.

Fig. 6 has shown the basic structure schematic diagram of present embodiment.As shown in Figure 6, corresponding module in the present embodiment among the function of module and structure and Fig. 3 is basic identical, its difference is: described AAGC control module 104 is further used for: preserve the phase compensation table that is used to write down corresponding relation between AAGC controlled quentity controlled variable and the phase change, determine phase change according to AAGC controlled quentity controlled variable and phase compensation table, and the phase change of determining is exported to NCO in the Digital Down Converter Module 1051.

Described NCO carries out phase compensation, and will export to the DDC multiplier through the numerical control oscillator signal of phase compensation according to determining first phase from the phase change of AAGC control module 104 inputs.

In the practical application, because the smoothing effect of filter after the DDC, it is a progressive formation that the phase change of NCO is reflected on the output signal, so the mode of this phase compensation relatively is suitable for phase change slowly.

Device embodiment seven

In the practical application,, be included in the phase change again, and the phase characteristic of variable-gain simulation receiving channel module 101 changes with the AAGC controlled quentity controlled variable if signal both had been included in the changes in amplitude.At this moment, both need the amplitude of signal was compensated, simultaneously the phase place of signal is compensated again.

Fig. 7 has shown the basic structure schematic diagram of receiver in the present embodiment.In the present embodiment, system adopts modulation systems such as QAM.As shown in Figure 7, present embodiment comprises: variable-gain simulation receiving channel module 101, analog to digital modular converter 102, real signal envelope power detection module 303, AAGC control module 104, digital signal processing module 105.Wherein, digital signal processing module 105 also comprises: AAGC amplitude compensating module 1054, Digital Down Converter Module 1051, digital filtering module 1052, AAGC phase compensation block 1055, back stages of digital processing module 1053.

In this enforcement among the 26S Proteasome Structure and Function of module and Fig. 3 corresponding module basic identical, different is: described AAGC control module 104 is further used for: preserve the gain compensation table that is used to write down corresponding relation between AAGC controlled quentity controlled variable and the change in gain, preservation is used to write down the phase compensation table of corresponding relation between AAGC controlled quentity controlled variable and the phase change, determine amplitude and phase change according to AAGC controlled quentity controlled variable, gain compensation table and phase compensation table, and the change in gain of determining exported to AAGC amplitude compensating module 1054, phase change is exported to AAGC phase compensation block 1055.

Described AAGC amplitude compensating module 1054 is used for: according to the change in gain by 104 inputs of AAGC control module, the digital band pass signal by 102 inputs of analog to digital modular converter is carried out the amplitude compensation, and export to Digital Down Converter Module 1051.

Described AAGC phase compensation block 1055 is used for: according to the phase change by 104 inputs of AAGC control module, the digital baseband signal by digital filtering module 1052 inputs is carried out phase compensation, and export to back stages of digital processing module 1053.

In the practical application, if desired amplitude and phase place are compensated, can use device embodiment one any carries out amplitude compensation to device embodiment three, any carries out phase compensation to use device embodiment four to device embodiment six, is about to amplitude compensation and phase compensation combination in any.

Certainly, if between Digital Down Convert processing and digital filtering processing, carry out amplitude compensation and phase compensation, perhaps between digital filtering processing and back stages of digital processing, carry out amplitude compensation and phase compensation, then both can carry out amplitude compensation and phase compensation respectively, also can carry out amplitude compensation and phase compensation simultaneously.

Device embodiment eight

Fig. 8 is an embodiment who carries out amplitude compensation and phase compensation simultaneously, as shown in Figure 8, in this enforcement among the 26S Proteasome Structure and Function of module and Fig. 3 corresponding module basic identical, different is: described AAGC control module 104 is further used for: preserve the gain compensation table that is used to write down corresponding relation between AAGC controlled quentity controlled variable and the change in gain, preservation is used to write down the phase compensation table of corresponding relation between AAGC controlled quentity controlled variable and the phase change, according to the AAGC controlled quentity controlled variable, gain compensation table and phase compensation table are determined amplitude and phase change, and change in gain and the phase change determined are exported to AAGC amplitude and phase compensation block 1056.

Described AAGC amplitude compensating module 1056 is used for: according to change in gain and the phase change by 104 inputs of AAGC control module, digital baseband signal by 1052 inputs of digital filtering processing module is carried out amplitude compensation and phase compensation, and export to back stages of digital processing module 1053.

At the receiver that the present invention proposes, the present invention also provides a kind of method that receives wireless signal.The core concept that the present invention receives the wireless signal method is: directly carry out the real signal envelope power according to a spot of sample value after the digital sample and detect, obtain envelope power; Produce the AAGC control signal according to the envelope power that obtains again, promptly the analog bandpass signal to input receiver carries out AAGC control; Then, proceed digital processing, obtain and output bit flow.

Fig. 9 is the present invention program's a flow chart.As shown in Figure 9, the present invention's method of receiving wireless signal may further comprise the steps:

Step 901: the analog bandpass signal with input receiver under the control of simulation automatic gain control AAGC signal carries out the variable-gain processing.

Step 902: will carry out digital sample through the analog bandpass signal of variable-gain, and obtain the digital band pass signal, and again the digital band pass signal will be divided into feedback branch and forward direction branch road two-way.

Step 903: the current sampling point of feedback branch digital band pass signal is obtained envelope power with the sampling point that before continues detect, determine the AAGC controlled quentity controlled variable, produce the AAGC control signal by the AAGC controlled quentity controlled variable again according to the envelope power that obtains; Digital band pass signal process digital processing to the forward direction branch road obtains bit stream.

Described here determines the AAGC controlled quentity controlled variable according to envelope power, and belongs to prior art according to AAGC controlled quentity controlled variable generation AAGC control signal, no longer is described in detail herein.

In the practical application, the method for the digital band pass signal of front branch road being carried out digital processing is: earlier the digital band pass signal is carried out Digital Down Convert and handle, carry out digital filtering again and handle, carry out back stages of digital processing then.Back stages of digital described here is handled and is referred to processing such as extraction, filtering, demodulation.Certainly, concrete mode that the back stages of digital is handled in the reality and receiver design and the signal correction of handling no longer are described in detail herein.

Among the present invention, the sampling point that continues before described is previous sampling point or preceding two sampling points of current sampling point, that is to say that the method that obtains envelope power has two kinds of methods: a kind of method is to obtain envelope power according to current sample value and previous sample value; Another method is to obtain envelope power according to current sample value and preceding two sample value.

Referring to Fig. 3, the carrier frequency of supposing the analog bandpass signal of input receiver of the present invention is fc, and handling through variable-gain still is f _c, the analog to digital sample frequency is f _s, and f _cAnd f _sThe pass of satisfying is:

$|f_c-\frac{2k+1}{4}{f}_s|=\mathrm{\ϵ}{f}_s,$ K is a nonnegative integer formula 1

1〉〉 ε 〉=0 formula 2

That is: ε is one and little many but be not less than 0 number than 1, and in the practical application, ε generally is no more than 0.2, and ε is the smaller the better, and ε is 0 best.ε be not 0 may since design the time cause, promptly according to design

And f _cJust unequal, little difference is arranged; Also may be because the frequency synchronization error of system causes, though promptly will And f _cBe designed to equate, but because the frequency synchronization error of system, such as the transmitting-receiving frequency synchronous error, perhaps the incoherent error between sampling clock and the radio-frequency (RF) local oscillator has caused actual

And f _cFine difference.

In the practical application,, and make following envelope computing formula be set up sample frequency f for anti-aliased _sThe pass of satisfying with the bandpass signal bandwidth B is:

f _s2B formula 3

Here "〉〉 " the meaning be much larger than, such as f _s10B even bigger.Because sample frequency is f _s, the hypothesis sampled point is spaced apart T among the present invention _s, and T _sSatisfy:

T _s=1/f _sFormula 4

In addition, among the present invention, sample value is x (n), can be expressed as:

$x\left(n\right)=\mathrm{Re}\left\{\tilde{x}\left(n\right)\exp \left(j2\mathrm{\π}{f}_{c}n{T}_s\right)\right\}$ Formula 5

Wherein,

Be digital baseband signal, can be expressed as:

$\tilde{x}\left(n\right)=i\left(n\right)+\mathrm{jq}\left(n\right)$ Formula 6

I (n) is an I road signal, and q (n) is a Q road signal, and both form digital I﹠amp; Q signal, i.e. I﹠amp; The Q complex signal is also referred to as baseband signal.

Can obtain according to formula 6:

${\left|\tilde{x}\left(n\right)\right|}^2={\left(i\left(n\right)\right)}^2+{\left(q\left(n\right)\right)}^2$ Formula 7

At f _s/ B〉〉 under 1 the condition, have:

$i(n-1)\≈\frac{i\left(n\right)+i(n-2)}{2}$ Formula 8

$q(n-1)\≈\frac{q\left(n\right)+q(n-2)}{2}$ Formula 9

In the practical application, can be similar to and think:

I (n) ≈ i (n-1) formula 10

Q (n) ≈ q (n-1) formula 11

According to formula 7, convolution 1, formula 2, formula 4, formula 5, formula 8, formula 9 again can obtain:

${\left|\tilde{x}(n-1)\right|}^2\≈P_1(n-1)={\left(x(n-1)\right)}^2+{\left(\frac{x\left(n\right)-x(n-2)}{2}\right)}^2$ Formula 12

That is to say that obtain the envelope power at previous sampling point n-1 place according to current sample value x (n) and preceding two sample value, preceding two sample value described here just are meant x (n-1) and x (n-2).Because the interval between n and the n-1 sampling point is very little, can think that the envelope power at n-1 sampling point place is exactly the current envelope power of real signal, the i.e. envelope power at n sampling point place.

Similarly, according to formula 7, convolution 1, formula 2, formula 4, formula 5, formula 10, formula 11 again can obtain:

${\left|\tilde{x}\left(n\right)\right|}^2\≈P_2\left(n\right)={\left(x\left(n\right)\right)}^2+{\left(x(n-1)\right)}^2$ Formula 13

That is to say, according to the envelope power at current sample value x (n) and the current sampling point n of previous sample value x (n-1) acquisition place, the i.e. current envelope power of real signal.

In formula 12 and the formula 13, all will be to R ²=a ²+ b ²The formula of type is calculated.A herein, b is a nonnegative value.Such as for formula 12:a=|x (n-1) |, $b=\left|\frac{x\left(n\right)-x(n-2)}{2}\right|$ , can use following so-called piecewise linear approximation formula directly to ask the approximation of R.Below enumerate the example of two piecewise linear approximation formula, one of selection is just passable during realization.

$R\≈\max (a,b)+\frac{3}{8}\min (a,b)$ Formula 14.1

$R\≈\max (\max (a,b),\frac{7}{8}\max (a,b)+\frac{1}{2}\min (a,b))$ Formula 14.2

Directly use R to carry out the calculating of AAGC controlled quentity controlled variable then.Formula 14.1 and formula 14.2 with respect to $R=\sqrt{a^2+b^2}$ The worst error of ideal value be respectively 0.57dB and 0.26dB.But with respect to the quadratic sum of asking in formula 12 and the formula 13, formula 14.1 and formula 14.2 can be saved operand, thereby further reduce the time-delay of feedback loop.

So, in the practical application, can directly utilize formula 12 or formula 13 to obtain envelope power, can utilize formula 14.1 or formula 14.2 to come realization formula 12, obtain envelope power, also can utilize formula 14.1 or formula 14.2 to come realization formula 13, no matter which kind of method of employing, can realize with Digital Logic, no longer be described in detail herein.

In addition, in the practical application, if system adopts permanent envelope modulation, that is: information only is included in the phase change, be not included in the changes in amplitude, and, the phase characteristic of variable-gain simulation receiving channel module 101 does not change with the AAGC controlled quentity controlled variable, so, the signal after the control of process AAGC loop just need not the compensation of the amplitude of carrying out and/or phase place, can directly carry out digital processing and obtain bit stream.

But in actual applications, if system adopts modulation systems such as QAM, OFDM, information is included in phase change and the changes in amplitude, even the phase characteristic of variable-gain simulation receiving channel module 101 does not change with the AAGC controlled quentity controlled variable, also need not lose effective information to carrying out the amplitude compensation through the signal after the control of AAGC loop.Certainly,, not only need to carry out the amplitude compensation, also need to carry out phase compensation if the phase characteristic of variable-gain simulation receiving channel module 101 changes with the AAGC controlled quentity controlled variable.

In addition, in the practical application, if system adopts modes such as GMSK phase modulated, information only is included in the phase change, and be not included in the changes in amplitude, and the phase characteristic of variable-gain simulation receiving channel module 101 changes with the AAGC controlled quentity controlled variable, just needs separately phase place to be compensated not lose effective information.

For the present invention program is described better, further specify the method that the present invention receives wireless signal with embodiment below.

Method embodiment one

Fig. 4 has shown the basic structure schematic diagram of the used receiver of present embodiment.Referring to Fig. 4, in the present embodiment, system adopts modulation systems such as QAM, OFDM, and information is included in phase change and the changes in amplitude, and the phase characteristic of variable-gain simulation receiving channel module does not change with the AAGC controlled quentity controlled variable.

Figure 10 has shown the flow chart of present embodiment.As shown in figure 10, the method for present embodiment reception wireless signal may further comprise the steps:

Step 1001: the analog bandpass signal with input receiver under the control of simulation automatic gain control AAGC signal carries out the variable-gain processing.

Step 1002: the analog bandpass signal through variable-gain is carried out digital sample, obtain the digital band pass signal, and the digital band pass signal that obtains is divided into feedback branch and forward direction branch road two-way.

Step 1003: according to the current sampling point of the digital band pass signal of feedback branch and the envelope power that previous sampling point obtains current sampling point place real signal; Perhaps according to the current sampling point of the digital band pass signal of feedback branch and the envelope power that preceding two sample value obtain previous sampling point place real signal, and with its approximation as current sampling point place envelope power.

Step 1004: determine the AAGC controlled quentity controlled variable according to the envelope power that obtains, and produce the AAGC control signal by the AAGC controlled quentity controlled variable; Simultaneously, the gain compensation table that inquiry is preserved according to the AAGC controlled quentity controlled variable obtains change in gain.

In the practical application, can measure AAGC controlled quentity controlled variable and change in gain in advance, and its corresponding relation is got off with the gain compensation table record.When needs carry out the amplitude compensation, just can directly inquire about the gain compensation table and obtain change in gain, carry out the amplitude compensation according to change in gain then.

Corresponding relation as for AAGC controlled quentity controlled variable and change in gain can no longer be described in detail by in advance the measurement result of system being determined herein.

Step 1005: compensate according to the digital band pass signal amplitude of carrying out of the change in gain that obtains to the forward direction branch road.

In the practical application, the method ratio of amplitude compensation is easier to realize, can adopt digital multiplier to realize, be usually expressed as two parallel real multipliers, and the multiplying factor of two-way is identical, this identical multiplying factor is the amplitude compensation rate.

Step 1006: the digital band pass signal through the amplitude compensation is carried out Digital Down Convert handle, carry out low-pass filtering again, carry out the back stages of digital then and handle, obtain and output bit flow.

Method embodiment two

Based on method embodiment one, in the practical application, also can carry out down-converted earlier at digital band pass signal to the forward direction branch road, obtain digital I﹠amp; After the Q signal, just according to the change in gain that obtains to digital I﹠amp; Q signal carries out the amplitude compensation, then the signal that carries out the amplitude compensation is carried out digital filtering and handles.

Mode embodiment three

Based on method embodiment one, in the practical application, also can carry out down-converted and digital filtering earlier at digital band pass signal to the forward direction branch road, obtain after the digital baseband signal, just digital baseband signal is carried out the amplitude compensation according to the change in gain that obtains, carry out the back stages of digital then and handle, obtain bit stream.

Method embodiment four

Fig. 5 has shown the basic structure schematic diagram of receiver in the present embodiment.In the present embodiment, system adopts the GMSK phase modulating method, and information only is included in the phase change, and the phase characteristic of variable-gain simulation receiving channel module changes with the AAGC controlled quentity controlled variable.

Figure 11 has shown the flow chart of present embodiment.As shown in figure 11, the method for present embodiment reception wireless signal may further comprise the steps:

Step 1101～step 1103 is identical with step 1001～step 1003, repeats no more herein.

Step 1104: determine the AAGC controlled quentity controlled variable according to the envelope power that obtains, and produce the AAGC control signal by the AAGC controlled quentity controlled variable; Simultaneously, the phase compensation table that inquiry is preserved according to the AAGC controlled quentity controlled variable obtains phase change.

In the practical application, can measure the corresponding relation between AAGC controlled quentity controlled variable and the phase change earlier, and it is got off with the phase compensation table record.When needs carry out phase compensation, just can directly inquire about the phase compensation table, obtain phase change, carry out phase compensation according to phase change then.

Step 1105: the digital band pass signal to the forward direction branch road carries out the Digital Down Convert processing, carries out low-pass filtering again, obtains baseband signal.

Step 1106: baseband signal is carried out phase compensation according to the phase change that obtains.

In the practical application, phase place compensated also can adopt digital multiplier to realize, be usually expressed as a gain and be 1 complex multiplier, promptly only change signal phase, and do not change signal amplitude.

Step 1107: will carry out the back stages of digital through the baseband signal of phase compensation and handle, and obtain and output bit flow.

Method embodiment five

Based on method embodiment four, in the practical application, also can carry out down-converted earlier at digital band pass signal to the forward direction branch road, be separated into I﹠amp; The Q two paths of signals but still unfiltered before, just according to the acquisition change in gain to digital I﹠amp; Q signal carries out phase compensation, and then the signal through phase compensation is carried out digital filtering handle.

Method embodiment six

Referring to Fig. 6, in the practical application, also can directly utilize the NCO in the Digital Down Converter Module to carry out phase compensation.NCO generally comprises 3 configuration parameters, that is: direction of rotation, frequency word and first phase, NCO is according to these three parameter generating numerical control oscillator signals, and export to the DDC multiplier, the DDC multiplier will multiply each other from the digital band pass signal of analog to digital modular converter 102 inputs and the numerical control oscillator signal of importing from NCO again, carry out Digital Down Convert and handle, with the frequency spectrum shift of digital band pass signal position, obtain digital I﹠amp to 0 frequency; Q signal, and export to digital filtering module 1052.Wherein, this parameter of first phase can be determined the phase place of numerical control oscillator signal among the NCO, influences digital I﹠amp then; The phase place of Q signal.So, in the practical application, can directly realize phase compensation by this parameter of first phase that changes NCO.

Figure 12 has shown the flow chart of present embodiment.As shown in figure 12, the step of the method for present embodiment reception wireless signal comprises:

Step 1201～step 1203 is identical with step 1001～step 1003 among the method embodiment one, repeats no more herein.

Step 1204: determine the AAGC controlled quentity controlled variable according to the envelope power that obtains, and produce the AAGC control signal by the AAGC controlled quentity controlled variable; Simultaneously, the phase compensation table that inquiry is preserved according to the AAGC controlled quentity controlled variable obtains phase change.

Step 1205: determine the first phase of NCO according to obtaining phase compensation, produce the numerical control oscillator signal in conjunction with first phase, direction of rotation and frequency word again.

Step 1206: with the digital band pass signal multiplication of numerical control oscillator signal and front branch road, carry out Digital Down Convert and handle, obtain digital I﹠amp; Q signal.

Step 1207: with digital I﹠amp; Q signal carries out digital low-pass filtering to be handled, and carries out the back stages of digital again and handles, and obtains and output bit flow.

Method embodiment seven

Fig. 7 has shown the basic structure schematic diagram of receiver in the present embodiment.Referring to Fig. 7, in the practical application,, be included in the phase change again, and the phase characteristic of variable-gain simulation receiving channel module changes with the AAGC controlled quentity controlled variable if signal both had been included in the changes in amplitude.At this moment, both need the amplitude of signal was compensated, simultaneously the phase place of signal is compensated again.

Figure 13 has shown the flow chart of present embodiment.As shown in figure 13, the method for present embodiment reception wireless signal may further comprise the steps:

Step 1301～step 1303 is identical with step 1001～step 1003 among the method embodiment one, repeats no more herein.

Step 1304: determine the AAGC controlled quentity controlled variable according to the envelope power that obtains, and produce the AAGC control signal by the AAGC controlled quentity controlled variable; Simultaneously, inquiry is preserved according to the AAGC controlled quentity controlled variable gain compensation table and phase compensation table obtain change in gain and phase change.

Step 1305: compensate according to the digital band pass signal amplitude of carrying out of the change in gain that obtains to the forward direction branch road.

Step 1306: the digital band pass signal through the amplitude compensation is carried out Digital Down Convert handle, carry out low-pass filtering again, obtain digital baseband signal, according to the phase change that obtains digital baseband signal is carried out phase compensation then.

Step 1307: the digital baseband signal through amplitude compensation and phase compensation is carried out the back stages of digital handle, obtain and output bit flow.

In the practical application, amplitude and phase place to signal compensates if desired, any carries out the amplitude compensation to method embodiment three can to utilize method embodiment one, any carries out phase compensation to six kinds of method embodiment to utilize method embodiment four, is about to the method for amplitude compensation and the method for phase compensation and carries out combination in any.

Certainly, if between Digital Down Convert processing and digital filtering processing, carry out amplitude compensation and phase compensation, perhaps between digital filtering processing and back stages of digital processing, carry out amplitude compensation and phase compensation, then both can carry out amplitude compensation and phase compensation respectively, also can carry out amplitude compensation and phase compensation simultaneously.

Method embodiment eight

In this enforcement, the receiver basic structure of carrying out amplitude compensation and phase compensation simultaneously as shown in Figure 8, the amplitude of carrying out simultaneously compensate and the flow chart of phase compensation as shown in figure 14.In this enforcement, realize that the method that receives wireless signal may further comprise the steps:

Step 1404～step 1404 is identical with step 1301～step 1304, repeats no more herein.

Step 1405: the digital band pass signal to the forward direction branch road carries out Digital Down Convert processing and digital filtering processing, obtains digital baseband signal.

Step 1406: according to obtaining change in gain and phase change digital baseband signal is carried out amplitude compensation and phase compensation, again the digital baseband signal through amplitude compensation and phase compensation is carried out the back stages of digital and handle, obtain and output bit flow.

In the practical application, can realize compensation simultaneously, be usually expressed as a gain and be not 1 complex multiplier, promptly both change signal phase, change signal amplitude again with a digital multiplier to signal amplitude and phase place.

Use the present invention program, can directly utilize two sample value or three sample value, directly calculate the envelope power of current real signal, can reduce the time-delay of AAGC loop, strengthen the effect of AAGC control through the digital band pass signal that obtains behind the digital sample.In addition, owing to can carry out the compensation of amplitude and/or phase place to the signal after controlling through the AAGC loop, thus reach the not purpose of drop-out.

In sum, more than be preferred embodiment of the present invention only, be not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (16)

1, a kind of receiver comprises variable-gain simulation receiving channel module and digital signal processing module;

Described variable-gain is simulated receiving channel module, is used for carrying out variable-gain according to the analog bandpass signal of receiver being imported by the AAGC control signal of simulation automatic gain control (AAGC) control module input and handles, and export to the analog to digital modular converter;

Described digital signal processing module is used for the digital band pass signal by the input of analog to digital modular converter is carried out digital processing, obtains and output bit flow;

It is characterized in that this receiver also comprises: analog to digital modular converter, real signal envelope power detection module, AAGC control module; Wherein,

Described analog to digital modular converter is used for that the analog bandpass signal by the input of variable-gain simulation receiving channel module is carried out digital sample and handles, and obtains the digital band pass signal, and exports to real signal envelope power detection module and digital signal processing module;

Described real signal envelope power detection module is used for obtaining envelope power according to the current sample value of the digital band pass signal of being imported by the analog to digital modular converter and the sample value that before continues, and exports to the AAGC control module; The sample value that continues before described is previous sample value or preceding two sample value of current sampling point;

Described AAGC control module is used for producing the AAGC control signal according to determining the AAGC controlled quentity controlled variable by the envelope power of real signal envelope power detection module input by the AAGC controlled quentity controlled variable of determining, and exports to variable-gain simulation receiving channel module.

2, receiver according to claim 1 is characterized in that, described digital signal processing module comprises: Digital Down Converter Module, digital filtering module and back stages of digital processing module; Wherein,

Described Digital Down Converter Module is used for the digital band pass signal by the input of analog to digital modular converter is carried out down-converted, obtains digital I﹠amp; Q signal, and export to digital filtering module;

Described digital filtering module is used for the digital I﹠amp by the Digital Down Converter Module input; Q signal carries out low-pass filtering treatment, obtains digital baseband signal, and exports to back stages of digital processing module;

Back stages of digital processing module is used for handling carried out the back stages of digital by digital filtering module, obtains and output bit flow.

3, receiver according to claim 2 is characterized in that, this receiver further comprises:

AAGC amplitude compensating module is used for according to the change in gain by the input of AAGC control module, the signal by the input of analog to digital modular converter is carried out the amplitude compensation, and export to Digital Down Converter Module;

Described AAGC control module is further used for: preserve the gain compensation table that is used to write down corresponding relation between AAGC controlled quentity controlled variable and the change in gain, determine change in gain according to AAGC controlled quentity controlled variable and gain compensation table, and the change in gain of determining is exported to AAGC amplitude compensating module.

4, receiver according to claim 2 is characterized in that, this receiver further comprises:

AAGC amplitude compensating module is used for according to the change in gain by the input of AAGC control module, the signal by the Digital Down Converter Module input is carried out the amplitude compensation, and export to the digital filter module;

Described AAGC control module is further used for: preserve the gain compensation table that is used to write down corresponding relation between AAGC controlled quentity controlled variable and the change in gain, determine change in gain according to AAGC controlled quentity controlled variable and gain compensation table, and the change in gain of determining is exported to AAGC amplitude compensating module.

5, receiver according to claim 2 is characterized in that, this receiver further comprises:

AAGC amplitude compensating module is used for according to the change in gain by the input of AAGC control module, and the digital baseband signal by the digital filtering module input is carried out the amplitude compensation, and exports to back stages of digital processing module;

Described AAGC control module is further used for: preserve the gain compensation table that is used to write down corresponding relation between AAGC controlled quentity controlled variable and the change in gain, determine change in gain according to AAGC controlled quentity controlled variable and gain compensation table, and the change in gain of determining is exported to AAGC amplitude compensating module.

6, according to each described receiver of claim 2 to 5, it is characterized in that this receiver further comprises:

The AAGC phase compensation block is used for according to the phase change by the input of AAGC control module, to the digital I﹠amp by the Digital Down Converter Module input; Q signal carries out phase compensation, and exports to digital filtering module;

Described AAGC control module is further used for: preserve the phase compensation table that is used to write down corresponding relation between AAGC controlled quentity controlled variable and the phase change, determine phase change according to AAGC controlled quentity controlled variable and phase compensation table, and the phase change of determining is exported to the AAGC phase compensation block.

7, according to each described receiver of claim 2 to 5, it is characterized in that this receiver further comprises:

The AAGC phase compensation block is used for according to the phase change by the input of AAGC control module, and the digital baseband signal by the digital filtering module input is carried out phase compensation, and exports to back stages of digital processing module;

Described AAGC control module is further used for: preserve the phase compensation table that is used to write down corresponding relation between AAGC controlled quentity controlled variable and the phase change, determine phase change according to AAGC controlled quentity controlled variable and phase compensation table, and the phase change of determining is exported to the AAGC phase compensation block.

8, according to each described receiver of claim 2 to 5, it is characterized in that, described Digital Down Converter Module comprises DDC multiplier and digital controlled oscillator NCO, described NCO is further used for: according to the phase change by the input of AAGC control module, carry out phase compensation by the first phase that changes NCO, and export to the DDC multiplier;

Described AAGC control module is further used for: preserve the phase compensation table that is used to write down corresponding relation between AAGC controlled quentity controlled variable and the phase change, determine phase change according to AAGC controlled quentity controlled variable and phase compensation table, and the phase change of determining is exported to NCO.

9, a kind of method that receives wireless signal is characterized in that, this method may further comprise the steps:

A, the analog bandpass signal with input receiver under the control of simulation automatic gain control AAGC signal carry out the variable-gain processing, carry out digital sample again, obtain the digital band pass signal;

B, the digital band pass signal that obtains is divided into feedback branch and forward direction branch road two-way, according to the current sample value of feedback branch and the sample value that before continues obtain envelope power, determine the AAGC controlled quentity controlled variable by envelope power, and then produce the AAGC control signal; The forward direction branch road is carried out digital processing, obtain bit stream; The sample value that continues before described is previous sample value or preceding two sample value of current sampling point.

10, method according to claim 9 is characterized in that, the method for the described digital processing of step b is: earlier the digital band pass signal is carried out Digital Down Convert and handle, obtain digital I﹠amp; Q signal; Again to digital I﹠amp; Q signal carries out digital filtering to be handled, and obtains digital baseband signal; Carrying out the back stages of digital then handles.

11, method according to claim 10, it is characterized in that, the gain compensation table of corresponding relation between record AAGC controlled quentity controlled variable and the change in gain is set, carries out further comprising before the Digital Down Convert processing at the described digital band pass signal of step b with the forward direction branch road:

According to AAGC controlled quentity controlled variable inquiry gain compensation table, obtain the change in gain corresponding with the AAGC controlled quentity controlled variable, according to change in gain digital bandpass signal is carried out the amplitude compensation again.

12, method according to claim 10 is characterized in that, the gain compensation table of corresponding relation between record AAGC controlled quentity controlled variable and the change in gain is set, and described Digital Down Convert processing of step b and digital filtering further comprise between handling:

According to AAGC controlled quentity controlled variable inquiry gain compensation table, obtain the change in gain corresponding with the AAGC controlled quentity controlled variable, again according to change in gain to digital I﹠amp; Q signal carries out the amplitude compensation.

13, method according to claim 10 is characterized in that, the gain compensation table of corresponding relation between record AAGC controlled quentity controlled variable and the change in gain is set, and between described digital filtering processing of step b and back stages of digital were handled, this method further comprised:

According to AAGC controlled quentity controlled variable inquiry gain compensation table, obtain the change in gain corresponding with the AAGC controlled quentity controlled variable, according to change in gain digital baseband signal is carried out the amplitude compensation again.

According to each described method of claim 10 to 13, it is characterized in that 14, the phase compensation table of corresponding relation between record AAGC controlled quentity controlled variable and the phase change is set, and described Digital Down Convert processing of step b and digital filtering further comprise between handling:

According to AAGC controlled quentity controlled variable inquiry phase compensation table, obtain the phase change corresponding with the AAGC controlled quentity controlled variable, again according to phase change to digital I﹠amp; Q signal carries out phase compensation.

15, according to each described method of claim 10 to 13, it is characterized in that, the phase compensation table of corresponding relation between record AAGC controlled quentity controlled variable and the phase change is set, and between described digital filtering processing of step b and back stages of digital were handled, this method further comprised:

According to AAGC controlled quentity controlled variable inquiry phase compensation table, obtain the phase change corresponding with the AAGC controlled quentity controlled variable, according to phase change digital baseband signal is carried out phase compensation again.

16, according to each described method of claim 10 to 13, it is characterized in that, the phase compensation table of corresponding relation between record AAGC controlled quentity controlled variable and the phase change is set, the method that the described Digital Down Convert of step b is handled is: obtain the numerical control oscillator signal according to the pre-determined direction of rotation of NCO, frequency word and first phase, again digital band pass signal and numerical control oscillator signal are multiplied each other, obtain digital I﹠amp; Q signal;

The method of described definite NCO first phase is: according to AAGC controlled quentity controlled variable inquiry phase compensation table, obtain the phase change corresponding with the AAGC controlled quentity controlled variable earlier, determine the first phase of NCO again according to phase change.

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