CN104301048B - A kind of tranmission/reception apparatus power calibrating method - Google Patents

Abstract

The present invention provides a kind of tranmission/reception apparatus power calibrating method: step 1: to frequency spectrum by the same intervals N number of frequency of sampling, it is thus achieved that with power P_INThe simple signal f produced_StCorresponding gain calibration value G_St；Step 2: obtain with power P_INBandwidth W produced₁, lower frequency limit f_11L, upper limiting frequency f_11HBroadband signal B₁₁Corresponding gain calibration value G_B11；Step 3: to power P_INBandwidth W produced₁, lower frequency limit f_12L, upper limiting frequency f_12HBroadband signal B₁₂, calculate broadband signal B by following formula₁₂Corresponding gain calibration value G_B12If: J M ＜ K ＜ J, thenIf, J ＜ K ＜ J+M, then。

Description

A kind of tranmission/reception apparatus power calibrating method

Technical field

The present invention relates to a kind of method that the power of transmitting equipment or the equipment of reception is calibrated.

Background technology

Transmitter and receiver is required for relatively accurately launching the signal specifying power, or can relatively accurately receive To the signal of appointment power, for test instrunment, power accuracy the most directly evaluates whether one set of instrument closes The most important index of lattice.

So-called power accuracy is i.e.: certain is true i.e. to require to send (i.e. the front end of transmitter) by transmitter for transmitter Fixed power, then at transmitter port, the actual power of (and rear end of transmitter) and appointment watt level difference are the least, difference The least the most accurate；I.e. a letter determining power is poured at receiver port (i.e. the front end of transmitter) for receiver Number, and the actual power of the power of this signal that receiver measurement is arrived (i.e. the rear end of transmitter) and port difference is the least, difference The least the most accurate.

And the transceiver in broadband is because of the broadband unevenness characteristic of analog device, in order to solve power accuracy problem, one As all do frequency compensation, and be typically all the bivariate table done based on single-tone (i.e. single frequency point) and represent the offset under different frequency (i.e. frequency, two dimensions of offset).

And along with the bandwidth of some wireless standards more and more wider (11.ac:80MHz or 160MHz, LTE:20MHz, or band Interior CA(may also use single-frequency point calibration value)), and need to support narrow band signal, such as 20MHz, LTE of 802.11 simultaneously 1.4MHz, the bivariate table at this moment done based on single-tone, it is possible to can allow broadband power deterioration in accuracy.It is illustrated in fig. 1 shown below, along with frequency The curve that rate is continually changing represents the actual gain curve of certain transmitter, and we obtain the mode of this curve and are: by not Launch the signal of a known source power single-frequency point, the then power of measurand transmitter output with frequency, a rear power deducts Previous power obtains the yield value of this frequency.Time actually used, the output wanted according to you and corresponding frequency, will want Output deduct in above-mentioned curve the yield value of frequency of record, it is possible to know that source power needs to configure much.

But, owing to gain curve is by the signal of single-frequency point one by one measures (the band such as Fig. 1 obtained The vertical dotted line of arrow represents the gain at diagram frequency), and when actually used, may as it was noted above, launch signal It it is the signal of various bandwidth.When launch be broadband signal time (the dotted line frame in such as Fig. 1), now it is assumed that believe in this broadband Number bandwidth in gain be all identical, and all equal with the value of the center frequency point of this signal (the vertical dotted line of band arrow)；And Practical situation is not the most so, and the gain that dotted line both sides as vertical in Fig. 1 frequency is corresponding is significantly lower than the gain at vertical dotted line, because of This will result in final actual emission power size and intended deviation, has also resulted in power inaccurate.

Summary of the invention

The present invention solves that the existing channel power that transmits/receives calibrates the technical problem that precision is not enough under broadband signal, this A kind of tranmission/reception apparatus power calibrating method of bright proposition, comprises the steps:

Step 1: frequency spectrum is sampled N number of frequency: f according to same intervals_S1、f_S2、f_S3、……、f_S(N-1)、f_SN, for described The front end of equipment determines power P with a certain_IN, generation frequency be f_StSimple signal, measuring, calculate or obtain from memorizer should Gain calibration value G that simple signal is corresponding on said device_St, wherein, N is positive integer constant, and subscript t is that positive integer becomes Amount, it is value according to the value of variable i in step 3；

Step 2: for the front end of described equipment with power P_INProduce and carry a width of W₁Broadband signal B₁₁, its lower frequency limit is f_11L, upper limiting frequency be f_11H, frequency f_11LWith frequency f_11HMeet: (f_S(J-1)+f_SJ)/2 ＜ f_11L≤(f_SJ+f_S(J+1))/2、 (f_S(J+M-1)+f_S(J+M))/2 ＜ f_11H≤(f_S(J+M)+f_S(J+M+1))/2, measure, calculate or obtain this broadband signal from memorizer B₁₁Gain calibration value G corresponding on said device_B11, wherein, J, K, M are positive integer constant, W₁For positive number constant；

Step 3: for the front end of described equipment with power P_INThe a width of W of band produced₁, lower frequency limit be f_12LWith upper limit frequency Rate is f_12HBroadband signal B₁₂, and frequency f_12LWith frequency f_12HMeet: (f_S(K-1)+f_SK)/2 ＜ f_12L≤(f_SK+f_S(K+1))/2、 (f_S(K+M-1)+f_S(K+M))/2 ＜ f_12H≤(f_S(K+M)+f_S(K+M+1))/2,

Broadband signal B is calculated by following formula₁₂Corresponding gain calibration value G_B12:

If K ＜ J and K+M ＞ J, then,

If K ＞ J and K ＜ J+M, then。

Further, in step 1: the front end of described equipment is with power P_INGeneration frequency is f_StSimple signal, measure should The power P that simple signal is corresponding in the rear end of described equipment_St, calculate its gain calibration value G_St=P_St-P_IN。

Further, in step 2: calculate broadband signal B by following formula₁₁Corresponding gain calibration value G_B11:

。

Or, in step 2: the front end of described equipment is with power P_INProduce and carry a width of W₁Broadband signal B₁₁, measure this width Band signal B₁₁In the power P that described equipment rear end is corresponding_B11, calculate broadband signal B₁₁Corresponding gain calibration value G_B11= P_B11-P_IN。

Further, described power calibrating method also comprises the steps:

Step 4: build three-dimensional broadband signal table (W_r, f_rq, G_Brq), represent at front-end power to be P_INIn the case of, carry a width of W_r, the sign frequency in broadband be f_rqBroadband signal B_rqCorresponding gain calibration value is G_Brq, wherein, r and q is positive integer variable；

Step 5: inquiring about front-end power according to three-dimensional broadband signal table is P_INIn the case of, broadband signal B_rqCorresponding increasing Benefit calibration value G_Brq。

Further, in step 4: broadband signal B_rqSign frequency f_rqFor broadband signal B_rqCenter frequency point, f_rq= (f_rqL+f_rqH)/2, wherein, f_rqLFor broadband signal B_rqLower frequency limit, f_rqHFor broadband signal B_rqUpper limiting frequency.

Utilizing the calibration steps of the present invention, can calibrate respectively for the broadband signal of different bandwidth, calibration accuracy is higher, Can also obtain the different broadband signal gain calibration values more accurately of same bandwidth, improve the power accuracy under broadband, meanwhile, A lot of prover time will not be increased again.

Accompanying drawing explanation

Fig. 1 show existing employing single-tone calibration steps and calibrates broadband signal in gain versus frequency coordinate system The schematic diagram shown；

Fig. 2 show the calibration steps of this case and calibrates broadband or the narrow band signal of different bandwidth at gain versus frequency The schematic diagram shown in coordinate system.

Detailed description of the invention

The invention will be further described with detailed description of the invention below in conjunction with the accompanying drawings.

In order to solve the technical problem proposed in this case background technology, channel gain curve uses and actual will send The bandwidth that signal is same, such as dome rectangle wider in Fig. 2, the mode obtaining this curve when calibration is, by this rectangle The corresponding different frequent points in frequency band range launches the signal of a known source power, the then merit of measurand transmitter output Rate, the power measured deducts source power and then obtains the yield value of this bandwidth this frequency interior.Different bandwidth is then with same side Method obtains the gain curve (i.e. calibration value) of correspondence, and so, same bandwidth different frequent points just has different calibration values.

But this mode needs all calibrations one time of the different frequent points each band alleviating distention in middle-JIAO, and this has also implied that how many Plant bandwidth, it is necessary to increase the prover time of how many times, it is therefore desirable to reduce prover time on this basis.

As the tranmission/reception apparatus power calibrating method of the specific embodiment of the invention, comprise the steps:

Step 1: frequency spectrum is sampled N number of frequency: f according to same intervals_S1、f_S2、f_S3、……、f_S(N-1)、f_SN, described equipment Front end determine power P with a certain_IN, generation frequency be f_StSimple signal, measures, calculates or obtain this single-frequency from memorizer Gain calibration value G that signal is corresponding on said device_St, such as: measure this simple signal corresponding in the rear end of described equipment Power P_St, calculate its gain calibration value G_St=P_St-P_IN, wherein, N is positive integer constant, and subscript t is positive integer variable, its According to the value of variable i in step 3 and value；

Step 2: the front end of described equipment is with power P_INProduce and carry a width of W₁Broadband signal B₁₁, its lower frequency limit is f_11L、 Upper limiting frequency is f_11H, frequency f_11LWith frequency f_11HMeet: (f_S(J-1)+f_SJ)/2 ＜ f_11L≤(f_SJ+f_S(J+1))/2、(f_S(J+M-1)+ f_S(J+M))/2 ＜ f_11H≤(f_S(J+M)+f_S(J+M+1))/2, measure, calculate or obtain this broadband signal B from memorizer₁₁Described Gain calibration value G corresponding on equipment_B11, wherein, J, K, M are positive integer constant, W₁For positive number constant；

Step 3: for the front end of described equipment with power P_INThe a width of W of band produced₁, lower frequency limit be f_12LWith upper limit frequency Rate is f_12HBroadband signal B₁₂, and frequency f_12LWith frequency f_12HMeet: (f_S(K-1)+f_SK)/2 ＜ f_12L≤(f_SK+f_S(K+1))/2、 (f_S(K+M-1)+f_S(K+M))/2 ＜ f_12H≤(f_S(K+M)+f_S(K+M+1))/2,

Broadband signal B is calculated by following formula₁₂Corresponding gain calibration value G_B12:

If K ＜ J and K+M ＞ J, then,

If K ＞ J and K ＜ J+M, then。

In step 2, broadband signal B can be calculated by the way of being averaging₁₁Corresponding gain calibration value G_B11:

, this rough calculation mode is applicable to various situation, but its computational accuracy is the highest, But when passage is 0 intermediate frequency, the result precision calculated by this formula is higher；

Or, measure this broadband signal B₁₁In the power P that described equipment rear end is corresponding_B11, calculate broadband signal B₁₁Institute is right Gain calibration value G answered_B11= P_B11-P_IN。

So, (i.e. there is the broadband signal of identical bandwidth, as bandwidth is W in same type of broadband signal₁Under), For two or more broadband signals having common overlapping frequency spectrum, only need to measure and calculate one of them broadband signal B₁₁Calibration Value and small number of frequency calibration value, then the B of other bandwidth signals is calculated by above formula_1qCalibration value, the school calculated Quasi-value precision is more accurate, and only increases the measurement work to a small amount of frequency calibration value；And two are weighed the most jointly The broadband signal to be measured of folded frequency spectrum, can build a width of W of one or more band₁Broadband signal by broadband signal to be measured for the two Couple together, after the gain calibration value measuring one of them measured signal, then by recursive algorithm, calculate another to be measured The gain calibration value of bandwidth signal.

For full frequency band bandwidth relatively wide in the case of, measured by the method doing bivariate table and typically require measurement Frequency number is more, such as 200 points, needs to take considerable time；And bandwidth types is the most fewer, such as 5 kinds, therefore step 2 The time increased is compared the former and just corresponds to 5/200=2.5%, and step 3 can be calculated by computer, expends the time shorter, Therefore, step 2,3 times increased are substantially negligible and disregard.

On the basis of above-mentioned calibration steps, also can set up three-dimensional data table and supply inquiry, above-mentioned calibration steps is further also Comprise the steps:

Step 4: build three-dimensional broadband signal table (W_r, f_rq, G_Brq), represent at front-end power to be P_INIn the case of, carry a width of W_r, the sign frequency in broadband be f_rqBroadband signal B_rqCorresponding gain calibration value is G_Brq, introduce and characterize frequency f_rqBe in order to The convenience represented, by characterizing frequency f_rq, in conjunction with bandwidth W_r, i.e. can determine that unique broadband signal B_rq, wherein, r and q is just Integer variable；Preferably, broadband signal B_rqSign frequency f_rqFor broadband signal B_rqCenter frequency point, i.e. f_rq=(f_rqL+f_rqH)/ 2, wherein, f_rqLFor broadband signal B_rqLower frequency limit, f_rqHFor broadband signal B_rqUpper limiting frequency；

Step 5: inquiring about front-end power according to three-dimensional broadband signal table is P_INIn the case of, broadband signal B_rqCorresponding increasing Benefit calibration value G_Brq。

The present invention is by setting up a three-dimensional broadband signal table (bandwidth, the sign frequency of bandwidth, gain calibration value), real Accurate calibration under existing wide band narrow band.

Such as, the sampling interval is 1MHz, it is known that or record or calculate bandwidth pin 80MHz, lower frequency limit is 5110MHz, upper limiting frequency are broadband signal B of 5190MHz₁₁Gain calibration value be G_B11, then, to carry a width of 80MHz, under Limit frequency is 5111MHz, upper limiting frequency is broadband signal B of 5191MHz₁₂It is corrected:

Record and calculate or obtain from the data being pre-stored within memorizer the single-tone calibration value of 5110MHz respectively G_S1Single-tone calibration value G with 5191MHz_S81；

Then broadband signal B is calculated₁₂Gain calibration value G_B12:

G_B12= G_B11+ (G_S81- G_S1)/80。

It is described above as combining concrete preferred implementation further description made for the present invention, it is impossible to assert Being embodied as of the present invention is confined to these explanations.For general technical staff of the technical field of the invention, Without departing under present inventive concept premise, it is also possible to make some simple deduction or replace, all should be considered as belonging to the guarantor of the present invention Protect scope.

Claims (6)

1. a tranmission/reception apparatus power calibrating method, comprises the steps:

Step 1: frequency spectrum is sampled N number of frequency: f according to same intervals_S1、f_S2、f_S3、……、f_S(N-1)、f_SN, for described equipment Front end determine power P with a certain_IN, generation frequency be f_StSimple signal, measure, calculate or from memorizer, obtain this list Frequently gain calibration value G that signal is corresponding on said device_St, wherein, N is positive integer constant, and subscript t is positive integer variable, It is according to the value of variable i in step 3 and value；

Step 2: for the front end of described equipment with power P_INProduce and carry a width of W₁Broadband signal B₁₁, its lower frequency limit is f_11L、 Upper limiting frequency is f_11H, frequency f_11LWith frequency f_11HMeet: (f_S(J-1)+f_SJ)/2 ＜ f_11L≤(f_SJ+f_S(J+1))/2、(f_S(J+M-1)+ f_S(J+M))/2 ＜ f_11H≤(f_S(J+M)+f_S(J+M+1))/2, measure, calculate or obtain this broadband signal B from memorizer₁₁Described Gain calibration value G corresponding on equipment_B11；

Step 3: for the front end of described equipment with power P_INThe a width of W of band produced₁, lower frequency limit be f_12LWith upper limiting frequency it is f_12HBroadband signal B₁₂, and frequency f_12LWith frequency f_12HMeet: (f_S(K-1)+f_SK)/2 ＜ f_12L≤(f_SK+f_S(K+1))/2、 (f_S(K+M-1)+f_S(K+M))/2 ＜ f_12H≤(f_S(K+M)+f_S(K+M+1))/2,

Wherein, K ≠ J；

Broadband signal B is calculated by following formula₁₂Corresponding gain calibration value G_B12:

If K ＜ J and K+M ＞ J, then $G_{B12}=G_{B11}+(\underset{i=K}{\overset{J-1}{\mathrm{\Σ}}}{G}_{Si}-\underset{i=K+M+1}{\overset{J+M}{\mathrm{\Σ}}}{G}_{Si})/M,$

If K ＞ J and K ＜ J+M, then $G_{B12}=G_{B11}+(\underset{i=J+M+1}{\overset{K+M}{\mathrm{\Σ}}}{G}_{Si}-\underset{i=J}{\overset{K-1}{\mathrm{\Σ}}}{G}_{Si})/M;$

Wherein, J, K, M are positive integer constant, W₁For positive number constant.

Power calibrating method the most according to claim 1,

In step 1: the front end of described equipment is with power P_INGeneration frequency is f_StSimple signal, measure this simple signal described The power P that the rear end of equipment is corresponding_St, calculate its gain calibration value G_St=P_St-P_IN。

Power calibrating method the most according to claim 1,

In step 2: calculate broadband signal B by following formula₁₁Corresponding gain calibration value G_B11:

$G_{B11}=\underset{i=J}{\overset{J+M}{\mathrm{\Σ}}}{G}_{Si}/M.$

Power calibrating method the most according to claim 1,

In step 2: the front end of described equipment is with power P_INProduce and carry a width of W₁Broadband signal B₁₁, measure this broadband signal B₁₁? The power P that described equipment rear end is corresponding_B11, calculate broadband signal B₁₁Corresponding gain calibration value G_B11=P_B11-P_IN。

5., according to the power calibrating method described in claim 1,2,3 or 4, comprise the steps:

Step 4: build three-dimensional broadband signal table (W_r, f_rq, G_Brq), represent at front-end power to be P_INIn the case of, carry a width of W_r、 The sign frequency in broadband is f_rqBroadband signal B_rqCorresponding gain calibration value is G_Brq, wherein, r and q is positive integer variable；

Step 5: inquiring about front-end power according to three-dimensional broadband signal table is P_INIn the case of, broadband signal B_rqCorresponding gain calibration Value G_Brq。

Power calibrating method the most according to claim 5,

In step 4: broadband signal B_rqSign frequency f_rqFor broadband signal B_rqCenter frequency point, wherein, f_rq=(f_rqL+f_rqH)/ 2, f_rqLFor broadband signal B_rqLower frequency limit, f_rqHFor broadband signal B_rqUpper limiting frequency.