CN101582727B - Method and device for time template measurement - Google Patents
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Abstract
The invention discloses a method for time template measurement, which comprises the following steps: according to the current time interval, directly outputting sampling data in transmitting period without passing through a root-raised cosine (RRC) filter; complementing sampling data during transmit-off power; and outputting the sampling data by the RRC filter. The invention also discloses a device for time template measurement, which comprises a resolution filter, an A/D sampling module and an RRS filter; the key is that the device also comprises a signal distinguishing and processing module;and the RRS filter further comprises a data complement module and an RRC filter module. The method and the device not only make the measurement for a transmitting time template accord with the code requirement, but also cannot influence the measurement of the transmit-off power.
Description
Technical Field
The present invention relates to a template measurement technique in a Time Division-synchronous code Division Multiple Access (TD-SCDMA) system, and more particularly, to a Time template measurement method and apparatus in a Time Division duplex mobile communication system.
Background
In a third generation (3G) mobile communication system, TD-SCDMA, which is one of air interface specifications, is the only standard in three international standards of the 3G system that adopts a Time Division Duplex (TDD) mode. For a TDD system, reception and transmission use the same frequency, are performed in time division, and reception is not performed during transmission and transmission is not performed during reception. In order to protect the transceiver switching of the transceiver without affecting the communication system, it is generally required that the transmission power is not turned on too early and is not turned off too long, otherwise the normal operation of the receiver and the normal reception of other base stations (NodeB) or User Equipment (UE) are affected. Therefore, in the radio specification of TDD, there are requirements for the transmission power when the transmitter is turned off, and the time for the transmission power to ramp up and down.
Specifically, the Root Raised Cosine (RRC) filtered average power measured on one chip when the transmitter is turned off is defined as the transmit off power, the UE transmit off power requirement in TD-SCDMA is less than-65 dBm, the NodeB transmit off power requirement is less than-82 dBm, and an allowed transmit power ramp up or roll down time is defined between the transmit off power and the transmit on power, which is defined as the transmit switch time template. Requirements for UE transmit switch time template as shown in fig. 1, UE transmit power ramp up is only allowed to ramp up to-50 dBm at 13 chips before transmission, and then the transmit power is ramped up from-50 dBm to the average transmit power within 10.15625us at 13 chips, typically the maximum transmit average power of the UE is 24 dBm; accordingly, the transmit power roll-off occurs from the average transmit power to below the transmit off power over a 12 chip time period, i.e., 9.375 us. In fig. 1, it is assumed that the chip rate of TD-SCDMA is 1.28MHz, and the duration of one chip is 1/1.28 MHz-0.78125 us.
In practical application, when TD-SCDMA is measured with the emission power and the emission time template, because the emission power is measured according to the requirement of measuring the average power of RRC filtering on one chip, if the measured signal does not pass through the RRC filter during measurement, the measurement of the emission power does not meet the standard requirement; however, if the input signals of the device to be tested pass through the RRC filter, the signal change is slowed down due to the influence of filtering, and although the device meets the specification requirements, the measurement result cannot meet the specification requirements, and the performance of the actual signal cannot be reflected.
In the prior art, because the measurement equipment is not complete, most of the measurement of the emission time template in TD-SCDMA is performed by a method of performing time domain measurement by setting a wide Resolution Bandwidth (RBW) without using an RRC filter, and fig. 2 is an example of performing time template measurement by using a spectrometer. In fig. 2, the spectrometer is set to time domain measurement, with scan time on the abscissa, in the range of 50 us; the central position is positioned at the starting time of the transmitting time slot; the ordinate is the power value, and the measurement range is 0 to-100 dBm. RBW in fig. 2 is set to 1MHz, video bandwidth (VRB) is set to 10MHz, and the measurement curve is the actual transmission power curve.
It can be seen that the currently used measurement method can meet the measurement requirement of the transmission time template, but the measurement specification requirement of the average power of the RRC filter on each chip during the off period of the transmitter for the transmission-off power measurement cannot be met because the corresponding measurement method does not pass the measured signal through the RRC filter. That is, the existing measurement implementation cannot simultaneously make the measurement of the transmission time template and the measurement of the transmission off-power meet the requirements of the respective specifications.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a method and an apparatus for measuring a time template, which can not only make the measurement of the transmit time template meet the specification requirement, but also not affect the measurement of the transmit power.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the invention provides a time template measuring method, which comprises the following steps: according to the current time interval, the sampling data in the transmitting period is directly output without root raised cosine RRC filtering, the sampling data in the transmitting power-off period is complemented first, and then the sampling data is output after RRC filtering.
Wherein the complementary data is: the first sampling data in the period of transmitting power-off is repeated more than once in the front end of the period of transmitting power-off, and the last sampling data in the period of transmitting power-off is repeated more than once in the back end of the period of transmitting power-off. Or, the complementary data is: more than one 0 is supplemented at the front end during the transmit off power period and more than one 0 is supplemented at the back end during the transmit off power period. Or, the complementary data is: the amplitude of the complement data at the front end of the emission-off power is the same as the amplitude of the first sampling data in the period of the emission-off power, and the phase of the complement data is the same as the phase of the corresponding sampling point in the period of the power roll-off; and the amplitude of the complement data at the rear end of the transmitting off-power is the same as the amplitude of the last sampling data in the period of transmitting off-power, and the phase of the complement data is the same as the phase of the corresponding sampling point in the period of power climbing.
The method further comprises the following steps: and performing joint operation on the data of a plurality of chips before and after each chip to obtain RRC filtering data of the corresponding chip, and calculating the power of the chip.
The method further comprises the following steps: judging whether the calculated chip power meets a transmitting power limit value specified by a radio frequency specification, if not, the measurement result does not meet the specification requirement; if so, the measurement results meet the specification requirements.
The invention also provides a time template measuring device, comprising: the device comprises a resolution filter, an A/D sampling module, an RRC filter, a signal distinguishing and processing module, wherein the RRC filter further comprises a complement data module and an RRC filtering module,
the signal distinguishing and processing module is used for directly outputting the sampling data in the period of transmitting power according to the current time interval and sending the sampling data in the period of transmitting off-power to the data complementing module;
the data complementing module is used for complementing data to the received sampling data and then sending the data to the RRC filtering module;
and the RRC filtering module is used for carrying out RRC filtering on the sampling data after the data are complemented, and carrying out combined operation on the data of a plurality of chips before and after each chip to obtain the RRC filtering data of the corresponding chips and then outputting the RRC filtering data.
The device further comprises an operation module and a judgment module, wherein the operation module is used for calculating the power of the chip according to the RRC filtering data of the corresponding chip obtained by the RRC filtering module; and the judging module is used for judging the chip power subjected to the RRC filtering and determining whether the chip power meets the emission power limit value specified by the radio frequency specification.
The time template measuring method and device of the invention adopts a sectional measuring mode for the transmitting power and the transmitting period power in the TD-SCDMA, directly outputs and displays the sampling data in the transmitting period specified in the transmitting time template, and outputs and displays the sampling data in the transmitting power period specified in the transmitting time template after complementing the data and performing RRC filtering, thus not only meeting the measuring requirement of the transmitting time template, but also meeting the measuring specification requirement of the RRC filtering average power on each code chip during the closing period of the transmitting power measuring transmitter, and not causing influence on the measuring of the transmitting power due to the signals in the power climbing or rolling-off process.
Furthermore, the invention also judges the code power after RRC filtering during the transmitting power period during the measurement, and judges whether the code power meets the transmitting power limit value specified by the specification so as to ensure that the measurement result meets the requirement of the radio frequency specification.
Drawings
FIG. 1 is a schematic diagram of a transmit switch time template;
FIG. 2 is a diagram illustrating measurement results of an example of a prior art transmission time template measurement;
FIG. 3 is a schematic flow chart of a time template measurement method according to the present invention;
FIG. 4 is a schematic diagram of the structure of the time template measuring device according to the present invention;
fig. 5 is a diagram of transmit off power RRC filtering in accordance with the present invention.
Detailed Description
The basic idea of the invention is: and measuring the emission power and the emission period power in a segmented manner, directly outputting and displaying the sampling data in the emission period specified in the emission time template, complementing the data for the sampling data in the emission power period specified in the emission time template, carrying out RRC filtering, and then outputting and displaying the sampling data.
Further, in the measurement process, whether the chip power in the period of transmitting off-power meets the transmitting off-power limit value specified by the radio frequency specification is judged, so that the measurement result meets the requirements of the radio frequency specification.
Fig. 3 is a schematic flow chart of a method for implementing time template measurement according to the present invention, as shown in fig. 3, the method includes the following steps:
step 301-302: receiving a signal X to be detected, and obtaining a baseband time domain signal through A/D sampling after resolution filtering processing;
typically, measurements are made using a measurement receiver. After the measured signal X is input into the measuring receiver, a resolution filter with wide enough resolution bandwidth is arranged in the measuring receiver to carry out radio frequency amplification, frequency conversion and filtering processing on the input measured signal X; and then the detected signal X is changed into an undistorted baseband time-domain signal through A/D sampling.
Step 303: determining whether the current time interval is a transmitting power period specified in a transmitting time template or a transmitting power-off period specified in the transmitting time template according to the current time interval;
for the sampling data in the period of transmitting power, directly outputting the sampling data without an RRC filter for subsequent processing and displaying, and then finishing the current processing flow; and for the sampling data in the period of transmitting the off-power, complementing the data, and then carrying out RRC filtering and outputting.
Wherein, the transmitting period comprises transmitting power climbing, rolling off and transmitting opening period. For the distinction between the transmission power period and the transmission-off power period, since the two periods have definite time intervals in the measuring device, the distinction can be directly determined according to the time intervals.
Here, it is necessary to complement data: on one hand, the RRC filtering needs to use the data of a plurality of chips before and after each chip to jointly operate to obtain the RRC filtering data of the corresponding chip, and then calculate the power of the chip, so that when the RRC filtering is performed on a plurality of chips at both ends during the period of transmitting off-power, a special data processing method needs to be adopted to complement the data; on the other hand, because the power change value at the boundary between the transmit power and the transmit off power is severe in the process of the transmit power rising and the roll-off, if the power sampling point with severe change is incorporated into the RRC filtering operation, the measured power near the beginning and the end of the transmit off power period will be raised and not meet the requirement of the off power value, and therefore, data needs to be complemented so that the measured value of the transmit off power after the RRC filtering is not affected by the severe change of the power during the transmit power rising and the roll-off.
Step 304: and carrying out subsequent processing and display on the sampling data subjected to the RRC filtering, simultaneously carrying out combined operation on the data of a plurality of chips before and after each chip to obtain the RRC filtering data of the corresponding chip, and further calculating the power of the chip.
How to perform subsequent processing and display after the sampling data is output belongs to the known technology, and is not described herein again.
Step 305-307: judging whether the calculated chip power meets a transmitting power limit value specified by a radio frequency specification, if not, indicating that the measurement result does not meet the specification requirement; if so, the measurement results meet the specification requirements.
In the above processing procedure, the complementary data generally has the following three processing modes:
a. the first sampling data in the period of transmitting power-off is repeated for a plurality of times at the front end of the period of transmitting power-off, and the last sampling data in the period of transmitting power-off is repeated for a plurality of times at the rear end of the period of transmitting power-off to complement the required data amount.
b. The plurality of 0's are supplemented at the front end during the transmission-off power period, and the plurality of 0's are supplemented at the rear end during the transmission-off power period to complement the required data amount.
c. The amplitude of the complement data at the front end of the emission-off power is the same as the amplitude of the first sampling data in the period of the emission-off power, and the phase of the complement data is the same as the phase of the corresponding sampling point in the period of the power roll-off; and the amplitude of the complement data at the rear end of the transmitting off-power is the same as the amplitude of the last sampling data in the period of transmitting off-power, and the phase of the complement data is the same as the phase of the corresponding sampling point in the period of power climbing.
Wherein the range and amount of front and back end supplemental data during the transmit off-power period is determined by the particular RRC filter selected. In practical applications, three ways of complementing data a, b, and c may also be used in combination, for example: repeating the first sampling data at the front end of the transmitting off-power, and adopting a 0 complementing mode at the rear end of the transmitting off-power, and the like.
In order to implement the time template measuring method, the present invention further provides a time template measuring apparatus, as shown in fig. 4, the apparatus including: the key points of the system are that the resolution filter 401, the A/D sampling module 402, the RRC filter, the operation module 406 and the judgment module 407 are as follows: a signal distinguishing and processing module 403 is further included between the a/D sampling module 402 and the RRC filter, and a data complementing module 404 and an RRC filtering module 405 are further disposed in the RRC filter. Wherein,
the resolution filter 401 is configured to perform resolution filtering processing on the input measured signal X, and then send the signal subjected to the resolution filtering processing to the a/D sampling module 402;
an a/D sampling module 402, which converts the detected signal into an undistorted baseband time domain signal through a/D sampling, and sends the baseband time domain signal to a signal distinguishing and processing module 403;
a signal distinguishing processing module 403, which determines whether the current time period is the transmission power period or the transmission off-power period specified in the transmission time template according to the current time interval, and directly outputs the sampled data in the transmission power period, as shown in point a in fig. 4, and for the sampled data in the transmission off-power period, sends the sampled data to a data complementing module 404 in the RRC filter;
the RRC filter is configured to complete data complementation, perform RRC filtering on the sample data after data complementation, perform joint operation on a plurality of chip data before and after each chip, and output the result to the operation module 406; the data complementing module 404 is configured to complement the received sampling data with data, and then send the data to the RRC filtering module 405; the RRC filtering module 405 is configured to perform RRC filtering on the sample data after data is complemented, perform joint operation on data of a plurality of chips before and after each chip, obtain RRC filtered data of a corresponding chip, and output the RRC filtered data to the operation module 406;
an operation module 406, which calculates the power of the chip according to the RRC filtering data of the corresponding chip obtained by the RRC filtering module 405;
here, the complementary data may adopt one of the three complementary data manners a, b and c described above, or any combination of the three manners.
The determining module 407 is configured to determine the chip power subjected to RRC filtering, and determine whether the chip power meets a transmit-off power limit specified by a radio frequency specification.
As shown in fig. 5, the RRC filtering process of the transmit-off power includes first complementing data 51 at the front end and complementing data 52 at the back end of the sampling data 50 during the transmit-off power period, and then performing RRC filtering to obtain a transmit-off power 53 after the RRC filtering.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (8)
1. A time template measuring method is characterized in that according to the current time interval, the sampling data in the transmitting period is directly output without root raised cosine RRC filtering, the sampling data in the transmitting power-off period is complemented with data first and then output after RRC filtering,
wherein the method further comprises: performing joint operation on the data of a plurality of chips before and after each chip to obtain RRC filtering data of the corresponding chip, calculating the power of the chip,
wherein the method further comprises: judging whether the calculated chip power meets a transmitting power limit value specified by a radio frequency specification, if not, the measurement result does not meet the specification requirement; if so, the measurement results meet the specification requirements.
2. The time template measuring method according to claim 1, wherein the complementary data is: the first sampling data in the period of transmitting power-off is repeated more than once in the front end of the period of transmitting power-off, and the last sampling data in the period of transmitting power-off is repeated more than once in the back end of the period of transmitting power-off.
3. The time template measuring method according to claim 1, wherein the complementary data is: more than one 0 is supplemented at the front end during the transmit off power period and more than one 0 is supplemented at the back end during the transmit off power period.
4. The time template measuring method according to claim 1, wherein the complementary data is: the amplitude of the complement data at the front end of the emission-off power is the same as the amplitude of the first sampling data in the period of the emission-off power, and the phase of the complement data is the same as the phase of the corresponding sampling point in the period of the power roll-off; and the amplitude of the complement data at the rear end of the transmitting off-power is the same as the amplitude of the last sampling data in the period of transmitting off-power, and the phase of the complement data is the same as the phase of the corresponding sampling point in the period of power climbing.
5. A time template measuring device comprises a resolution filter, an A/D sampling module and an RRC filter, and is characterized by also comprising a signal distinguishing and processing module, wherein the RRC filter further comprises a data complementing module and an RRC filtering module; wherein,
the signal distinguishing and processing module is used for directly outputting the sampling data in the period of transmitting power according to the current time interval and sending the sampling data in the period of transmitting off-power to the data complementing module;
the data complementing module is used for complementing data to the received sampling data and then sending the data to the RRC filtering module;
the RRC filtering module is used for carrying out RRC filtering on the sampling data after the data are complemented, carrying out combined operation on the data of a plurality of chips before and after each chip to obtain the RRC filtering data of the corresponding chip and then outputting the RRC filtering data,
the device further comprises an operation module and a judgment module; wherein,
the operation module is used for calculating the power of the chip according to the RRC filtering data of the corresponding chip obtained by the RRC filtering module;
and the judging module is used for judging the chip power subjected to the RRC filtering and determining whether the chip power meets the emission power limit value specified by the radio frequency specification.
6. The time template measurement device of claim 5, wherein the complementary data is: the first sampling data in the period of transmitting power-off is repeated more than once in the front end of the period of transmitting power-off, and the last sampling data in the period of transmitting power-off is repeated more than once in the back end of the period of transmitting power-off.
7. The time template measurement device of claim 5, wherein the complementary data is: more than one 0 is supplemented at the front end during the transmit off power period and more than one 0 is supplemented at the back end during the transmit off power period.
8. The time template measurement device of claim 5, wherein the complementary data is: the amplitude of the complement data at the front end of the emission-off power is the same as the amplitude of the first sampling data in the period of the emission-off power, and the phase of the complement data is the same as the phase of the corresponding sampling point in the period of the power roll-off; and the amplitude of the complement data at the rear end of the transmitting off-power is the same as the amplitude of the last sampling data in the period of transmitting off-power, and the phase of the complement data is the same as the phase of the corresponding sampling point in the period of power climbing.
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| CN1945997A (en) * | 2006-10-24 | 2007-04-11 | 重庆重邮信科股份有限公司 | Design method for radio frequency automatic power control module of TD-SCDMA terminal and its circuit |
| CN101039153A (en) * | 2006-03-15 | 2007-09-19 | 大唐移动通信设备有限公司 | Device and method for detecting period signal |
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| WO2004039024A1 (en) * | 2002-10-22 | 2004-05-06 | Wiseband Communications Ltd. | A peak-to-average power ratio modifier |
| CN101039153A (en) * | 2006-03-15 | 2007-09-19 | 大唐移动通信设备有限公司 | Device and method for detecting period signal |
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| TD-SCDMA终端射频一致性测试理论与研究;王冰;《中国优秀硕士学位论文全文数据库》;20071009;第43－45页 * |
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