CN102404057B - Method for increasing radiation performance of radio-frequency emission part of Global System for Mobile Communications (GSM) terminal - Google Patents

Abstract

A method for improving the radiation performance of the radio frequency transmission part of a GSM terminal in the field of mobile communication technology, comprising: reading RAMP curve information stored by the GSM terminal, testing the phase error of the transmitted symbol according to the stored RAMP curve, when the phase error of the transmitted symbol is greater than the protocol When the threshold is specified, modify the rising edge of the stored RAMP curve; test the phase error of the transmitted symbol according to the modified RAMP curve; when the phase error of the transmitted symbol is less than or equal to the threshold specified in the protocol, replace the stored information with the modified RAMP curve Otherwise, re-modify the rising edge of the stored RAMP curve or the rising edge of the modified RAMP curve until the phase error of the transmitted symbol is less than or equal to the threshold specified in the protocol. The invention reduces the cost while eliminating the influence of radiation interference on the transmission quality of the transmission time slot symbols.

Description

The Method of Improving Radiation Performance of Radio Frequency Transmitting Part of GSM Terminal

technical field

The invention relates to the technical field of mobile communication, in particular to a method for improving the radiation performance of the radio frequency transmitting part of a GSM terminal.

Background technique

Global System for Mobile Communication (GSM) is a Time Division Multiple Access (TDMA, Time Division Multiple Access) system. According to the protocol, each burst in any time slot of GSM must be stuck at the time specified in the protocol. within the template. The time template stipulated in the protocol is specifically shown in FIG. 1 .

The radio frequency performance of the transmitting part of the GSM terminal is divided into conduction performance and radiation performance. The so-called conduction performance refers to the RF transmission performance of the circuit board itself without the influence of the antenna, and the radiation performance refers to the RF transmission performance of the terminal including the antenna. Radiation performance represents the actual perception of the end user and is obviously more important. Since the radiation performance of the transmitting part of the terminal is radiated through the antenna, it may cause radiation interference to the circuit board, deteriorating the transmitting radio frequency performance of the circuit board itself, thereby deteriorating the radiation performance of the radio frequency transmitting part of the terminal.

Among the radiation interference generated by the terminal antenna radiation on the circuit board, there is a type of interference that affects the stabilization time of the radio frequency transmitter and power amplifier. Since GSM is a time-division system, under normal circumstances, the radio frequency transmitting part of a GSM terminal is only turned on during the transmitting time slot and closed during the receiving time slot. The radio frequency device itself has a stabilization time, that is, it needs to be stabilized for a certain period of time before it can work normally. Therefore, the general GSM terminal needs to open a certain time in advance when the transmission time slot is working, so as to ensure that it can work normally when actually transmitting data. This amount of time for opening in advance has been fixed after the circuit board is designed.

Under normal circumstances, the GSM terminal controls the power amplifier of the radio frequency transmission part to turn on and off through the RAMP (climbing) curve, so that it is strictly controlled within the time template shown in Figure 1 . The RAMP curve means that the transmit power of the power amplifier controlled by the software slowly changes from minimum to maximum when it is turned on and slowly from maximum to minimum when it is turned off. The RAMP curve in the prior art is shown in Figure 2, where the rising and falling edges are strictly symmetrical, the abscissa represents time, and the ordinate represents the control word of the power amplifier. The larger the control word, the greater the transmit power of the power amplifier. The state between the rising edge and the falling edge is the steady state of the control word.

However, radiation interference will affect the stabilization time of the radio frequency transmitter and power amplifier, making the stabilization time longer, which will cause the transmission quality of the first few symbols to be very poor when the transmission time slot actually starts to work, that is, the phase of the first few symbols The error is outside the specified range, which affects the overall radiation performance. In the GSM protocol, a symbol refers to each unit of data in sequential transmission and sequential reception.

In order to solve the above problems, in the prior art, the circuit board is redrawn to modify the hardware. The disadvantage of this processing method is that the verification period is long. If the verification is successful, all the circuit boards made in the previous period will be invalid. So the cost is higher.

Contents of the invention

The problem solved by the invention is to provide a method for improving the radiation performance of the radio frequency transmission part of the GSM terminal, and reduce the cost while eliminating the influence of radiation interference on the transmission quality of the first few symbols in the transmission time slot.

In order to solve the above problems, the present invention provides a method for improving the radiation performance of the radio frequency transmission part of the GSM terminal, including: reading the RAMP curve information stored by the GSM terminal, testing the phase error of the transmitted symbol according to the stored RAMP curve, when the transmitted When the phase error of the symbol is greater than the threshold specified in the protocol,

modifying the rising edge of the stored RAMP curve, the modified RAMP curve meets the time template of the GSM system;

According to the modified RAMP curve, test the phase error of the transmitted symbol;

When the phase error of the transmitted symbol is less than or equal to the threshold specified in the protocol, replace the stored RAMP curve information with the modified RAMP curve information; otherwise, re-modify the rising edge of the stored RAMP curve or the modified RAMP The rising edge of the curve until the phase error of the transmitted symbol is less than or equal to the threshold specified in the protocol.

Optionally, the replacing the stored RAMP curve information with the modified RAMP curve information includes: replacing the stored RAMP curve information in the non-volatile memory of the GSM terminal with the modified RAMP curve information .

Optionally, the protocol stipulates that the value range of the threshold includes: 0°-5°.

Optionally, the modifying the rising edge of the stored RAMP curve includes: increasing the control word of a plurality of time sampling points before the steady state in the rising edge of the stored RAMP curve, and making the plurality of time sampling points The control word of the point is larger than the control word of the steady state.

Optionally, the multiple time sampling points include 3 to 5 time sampling points.

Optionally, the modified control words at the multiple time sampling points are the same.

Optionally, the modified control words at the multiple time sampling points are different.

Optionally, the testing of the phase error of the transmitted symbol is implemented by using a phase error detection device.

Optionally, the GSM terminal includes: a mobile phone, a notebook, a POS machine or a vehicle-mounted computer.

Compared with the prior art, the present invention has the following advantages: for the situation that the stabilization time of the radio frequency emitter and the power amplifier increases due to radiation interference, the RAMP curve of the storage is adjusted without changing the hardware, so that the RAMP curve It reaches the maximum quickly a period of time in advance, so that the power amplifier transmits at high power a period of time in advance, even if the power amplifier stabilizes in advance, so that in the real transmission time slot, the quality of the first few symbols is normal, and other radio frequency indicators are also normal, and finally eliminated The deterioration of the transmission quality of the first few symbols in the transmission time slot caused by radiation interference.

Description of drawings

Fig. 1 is the schematic diagram of GSM system time template;

Fig. 2 is the schematic diagram of prior art RAMP curve;

FIG. 3 is a schematic flow diagram of a method for improving the radiation performance of a radio frequency transmission part of a GSM terminal provided by an embodiment of the present invention;

4 is a schematic diagram of a RAMP curve stored in an embodiment of the present invention;

Fig. 5 is a schematic diagram of a modified RAMP curve according to an embodiment of the present invention.

Detailed ways

In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

In the following description, many specific details are set forth in order to fully understand the present invention, but the present invention can also be implemented in other ways than those described here, so the present invention is not limited by the specific embodiments disclosed below.

As mentioned in the background technology section, for GSM terminals, radiation interference will affect the stabilization time of the radio frequency transmitter and power amplifier, making the stabilization time longer, which will cause the transmission quality of the first few symbols when the transmission time slot actually starts to work. Very poor, that is, the phase error of the first few symbols exceeds the specified range, thus affecting the overall radiation performance. Although the existing technology can solve the problem by redrawing the circuit board and modifying the hardware, the disadvantage of this processing method is that the verification cycle is longer. If the verification is successful, all the circuit boards made in the previous stage will be invalidated, so the cost is high. .

In view of the above-mentioned defects, the present invention provides a method for improving the radiation performance of the radio frequency transmission part of the GSM terminal. For the situation that the stabilization time of the radio frequency emitter and the power amplifier caused by radiation interference increases, under the premise of not changing the hardware, adjust The stored RAMP curve makes the RAMP curve reach the maximum quickly a period of time in advance, so that the power amplifier transmits at high power a period of time in advance, even if the power amplifier stabilizes in advance, so that in the real transmission time slot, the quality of the first few symbols is normal, and other The radio frequency index is also normal, and the deterioration of the transmission quality of the first few symbols in the transmission time slot caused by radiation interference is finally eliminated.

A detailed description will be given below in conjunction with the accompanying drawings.

Referring to Fig. 3, the method for improving the radiation performance of the radio frequency transmission part of the GSM terminal provided by this embodiment includes:

S1, read the RAMP curve information stored in the GSM terminal, and test the phase error of the transmitted symbol according to the stored RAMP curve;

S2. When the phase error of the transmitted symbol is greater than the threshold specified in the protocol, modify the rising edge of the stored RAMP curve, and the modified RAMP curve satisfies the time template of the GSM system;

S3. Test the phase error of the transmitted symbol according to the modified RAMP curve;

S4. When the phase error of the transmitted symbol is less than or equal to the threshold specified in the protocol, replace the stored RAMP curve information with the modified RAMP curve information; otherwise, re-modify the rising edge of the stored RAMP curve or the modified The rising edge of the RAMP curve until the phase error of the transmitted symbol is less than or equal to the threshold specified in the protocol.

First execute step S1, read the RAMP curve information that GSM terminal stores, and the RAMP curve information of described storage at least comprises the number information of time sampling point, time information and control word information, and the RAMP curve information stored in the present embodiment can specifically be by Figure 4 shows the RAMP curve representation.

Referring to Fig. 4, the rising edge and falling edge of the RAMP curve stored in this embodiment each include 16 time sampling points, and the control words of the 16 time sampling points on the rising edge are respectively: 88, 88, 88, 88, 88 . 151, 109, 104, 88, 88, 88, 88, 88, and 88. The rising and falling edges of the stored RAMP curve are strictly symmetrical and meet the requirements of the GSM system time template. The stored RAMP curve shown in FIG. 4 is only an example, and the number of time sampling points and the control word corresponding to each time sampling point may vary, which should not limit the protection scope of the present invention.

In this embodiment, the RAMP curve information is stored in the non-volatile memory of the GSM terminal, and the reading of the RAMP curve information stored by the GSM terminal is to read the corresponding data of the GSM terminal from the non-volatile memory of the GSM terminal. RAMP curve information. Wherein, the stored RAMP curve information refers to the RAMP curve information before modification by the method of this embodiment. There are many ways to specifically calculate the stored RAMP curve information, such as the automatic calculation of GSM power amplifier provided by the patent number ZL200810033976.3 The method for the RAMP parameter comprises: determining the waveform curve and the number of sampling points of one edge of the power amplifier; obtaining the sampling points whose quantity is the number of sampling points in the waveform curve to form a normalized power point array; according to the required The actual power level converts the normalized power point array into an actual power point array; according to a power calibration table, look up the power control word corresponding to each point in the actual power point array to form a RAMP of an edge power amplifier Parameters; according to the power amplifier RAMP parameter of one edge, the power amplifier RAMP parameter of the other edge is obtained. The above method of calculating the information of the RAMP curve (ie, the RAMP parameter) is only an example, and should not limit the protection scope of the present invention. It should be noted that the stored RAMP curve must satisfy the time template of the GSM system shown in FIG. 1 .

After reading the RAMP curve information stored in the GSM terminal, the phase error of the transmitted symbol is tested according to the stored RAMP curve. Wherein, the phase error of the test transmission symbol is well known to those skilled in the art, and this embodiment is realized by using a phase error detection device, for example, an Agilent 8960 comprehensive detector can be used. In other embodiments of the present invention, other phase error detection devices may also be used.

Then step S2 is executed, when the phase error of the transmitted symbol is greater than the threshold specified in the protocol, the rising edge of the stored RAMP curve is modified, and the GSM terminal makes the power amplifier transmit with high power in advance according to the modified RAMP curve, and the The adjusted RAMP curve meets the time template of the GSM system.

The phase error of the transmitted symbol has been obtained in step S1. When the phase error of the transmitted symbol is greater than the threshold specified in the 3GPP TS 05.05 agreement, the quality of the transmitted symbol is considered to be very poor, which will affect the overall radiation performance of the GSM terminal. Specifically, the agreement stipulates that the value range of the threshold includes: 0°-5°, such as 0°, 1°, 2°, 3°, 4°, 5° and so on.

In this embodiment, when the phase error of the transmitted symbol is greater than 5°, the rising edge of the stored RAMP curve needs to be modified, and the GSM terminal makes the power amplifier transmit with high power in advance according to the modified RAMP curve.

Wherein, said modifying the rising edge of the stored RAMP curve includes: increasing the control word of multiple time sampling points before the steady state in the rising edge of the stored RAMP curve, and making the multiple time sampling points The control word is larger than the control word in the steady state.

Figure 5 shows the modified RAMP curve of this embodiment. The rising edge and falling edge of the modified RAMP curve still include 16 time sampling points respectively. At this time, the control words of the 16 time sampling points on the rising edge are: 88, 88, 88, 88, 88, 88, 104, 109, 151, 208, 276, 390, 901, 901, 901, and 850; the control word of the 16 time sampling points on the falling edge remains unchanged, and they are still: 850, 830, 750, 600, 390, 276, 208, 151, and 109 , 104, 88, 88, 88, 88, 88, and 88.

By comparing Figure 5 and Figure 4, it can be known that this embodiment modifies the three time sampling points on the rising edge of the stored RAMP curve, that is, the control words of the time sampling points corresponding to the three control words of 600, 750, and 830 are respectively adjusted to 901 , 901, 901. The modified three control words are all 61 larger than the control word in the steady state, and the control word in the steady state is 850. It should be noted that this is only an example, and it should not limit the number of sampling points and control words for adjusting the time. The modified control words at the multiple time sampling points may be the same or different. For example, in another embodiment of the present invention, the control words at the time sampling points corresponding to the three control words 600, 750, and 830 may also be adjusted to 900, 901, and 900, respectively. In other embodiments of the present invention, if the rising edge includes 18 time sampling points, the control word of three time sampling points, four time sampling points or five time sampling points before the control word is stable can also be adjusted , even if the control word at the three time sampling points, four time sampling points or five time sampling points exceeds the control word in the steady state.

It should be noted that the modified RAMP curve shown in Fig. 5 must also meet the time template of the GSM system. This time template is also stipulated in the 3GPP TS 05.05 agreement. The time template that satisfies the GSM system includes: the time of the rising edge and falling edge of the burst, the time of the steady state, the transmit power corresponding to the time sampling point, etc., that is, the modified RAMP curve must strictly meet the requirements shown in Figure 1. Time template for the GSM system.

Next, step S3 is executed to test the phase error of the transmitted symbols according to the modified RAMP curve.

In this embodiment, according to the modified RAMP curve, the phase error detection device is used to measure the phase error of the transmitted symbols, especially to test the phase error corresponding to the symbol whose original phase error exceeds the threshold specified by the protocol. The method of testing the phase error of the transmitted symbol is described in the above step S1, and will not be repeated here.

Finally, step S4 is executed, when the phase error of the transmitted symbol is less than or equal to the threshold specified in the protocol, the modified RAMP curve information is replaced with the stored RAMP curve information; otherwise, the rising edge of the stored RAMP curve or the modified The rising edge of the RAMP curve until the phase error of the transmitted symbol is less than or equal to the threshold specified in the protocol.

When the phase error of the transmitted symbols tested in step S3 is less than or equal to the threshold specified in the protocol, such as less than or equal to 5°, it indicates that the modified RAMP curve has eliminated the impact of radiation interference on the transmission quality of the first few symbols in the transmission time slot. Therefore, the modified RAMP curve information replaces the stored RAMP curve information. Further, the modified RAMP curve information is replaced with the stored RAMP curve information stored in the non-volatile memory of the GSM terminal, such as: deleting the stored RAMP curve information in the non-volatile memory of the GSM terminal RAMP curve information, storing the modified RAMP curve information in the non-volatile memory of the GSM terminal.

When the phase error of the transmitted symbols tested in step S3 is greater than the threshold specified in the protocol, such as greater than 5°, it indicates that the modified RAMP curve still has not eliminated the impact of radiation interference on the transmission quality of the first few symbols in the transmission time slot. Therefore, it is necessary to return to step S2 to readjust the rising edge of the stored RAMP curve or to adjust the rising edge of the modified RAMP curve. When the re-adjustment is completed, continue to execute step S3, and use the readjusted RAMP curve to test the phase error of the transmitted symbol; continue to execute step S4, and judge whether the phase error of the transmitted symbol is less than or equal to the threshold specified in the agreement. , the adjustment ends; when it is greater than , return to step S2 again until the modified RAMP curve makes the phase error of the transmitted symbol less than or equal to the protocol-specified threshold. It should be noted that, in the process of modifying the RAMP curve, it is always necessary to ensure that the RAMP curve satisfies the time template of the GSM system. In this embodiment, the phase error of the transmitted symbol obtained according to the adjusted RAMP curve shown in FIG. 5 is already less than or equal to 5°. Therefore, the modified RAMP curve information corresponding to FIG. The stored RAMP curve information corresponding to Figure 4 in the volatile memory.

It should be noted that the GSM terminal described in this embodiment may be a mobile phone, a notebook, a POS machine, or a vehicle-mounted computer using the GSM system for communication, and the protection scope of the present invention should not be limited here.

In this embodiment, without changing the hardware, the deterioration of the transmission quality of the first few symbols of the transmission time slot due to radiation interference is successfully eliminated by adjusting the RAMP curve.

Although the present invention has been disclosed above with preferred embodiments, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, so the protection scope of the present invention should be based on the scope defined in the claims.

Claims (8)

1. A method for improving the radiation performance of the GSM terminal radio frequency transmission part, comprising: reading the RAMP curve information stored by the GSM terminal, testing the phase error of the transmitted symbol according to the stored RAMP curve, it is characterized in that, when the phase error of the transmitted symbol When the error is greater than the threshold specified in the protocol, Modifying the rising edge of the stored RAMP curve, the modified RAMP curve meets the time template of the GSM system; the modifying the rising edge of the stored RAMP curve includes: improving the steady state of the rising edge of the stored RAMP curve The control word of a plurality of time sampling points before, and make the control word of the plurality of time sampling points greater than the control word in the steady state; According to the modified RAMP curve, test the phase error of the transmitted symbol; When the phase error of the transmitted symbol is less than or equal to the threshold specified in the protocol, replace the stored RAMP curve information with the modified RAMP curve information; otherwise, re-modify the rising edge of the stored RAMP curve or the modified RAMP The rising edge of the curve until the phase error of the transmitted symbol is less than or equal to the threshold specified in the protocol. 2. the method for improving GSM terminal radio frequency transmitting part radiation performance as claimed in claim 1, is characterized in that, described RAMP curve information replacing described storage with the RAMP curve information after modification comprises: the RAMP curve information after described modification The curve information replaces the RAMP curve information stored in the non-volatile memory of the GSM terminal. 3. The method for improving the radiation performance of the radio frequency transmitting part of the GSM terminal as claimed in claim 1, wherein the value range of the threshold stipulated in the agreement includes: 0°～5°. 4. The method for improving the radiation performance of the radio frequency transmitting part of the GSM terminal as claimed in claim 1, wherein the plurality of time sampling points comprises 3 to 5 time sampling points. 5. The method for improving the radiation performance of the GSM terminal radio frequency transmission part as claimed in claim 1, wherein the modified control words of the plurality of time sampling points are the same. 6. The method for improving the radiation performance of the GSM terminal radio frequency transmission part as claimed in claim 1, wherein the modified control words of the multiple time sampling points are different. 7. The method for improving the radiation performance of the GSM terminal radio frequency transmission part as claimed in claim 1, characterized in that, the phase error of the test transmission symbol is implemented by using a phase error detection device. 8. The method for improving the radiation performance of the radio frequency transmitting part of the GSM terminal as claimed in claim 1, wherein the GSM terminal comprises: a mobile phone, a notebook, a POS machine or a vehicle-mounted computer.

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