CN109286971B

CN109286971B - Power control method and device based on DSP processing

Info

Publication number: CN109286971B
Application number: CN201710602591.3A
Authority: CN
Inventors: 董敏; 张凯; 魏燚潍
Original assignee: Potevio Information Technology Co Ltd
Current assignee: Potevio Information Technology Co Ltd
Priority date: 2017-07-21
Filing date: 2017-07-21
Publication date: 2021-08-06
Anticipated expiration: 2037-07-21
Also published as: CN109286971A

Abstract

The embodiment of the invention provides a power control method and a device based on DSP processing, wherein the method comprises the following steps: acquiring a receiving power value; determining a fitting algorithm corresponding to the receiving power value according to a fitting interval in which the receiving power value is located, wherein the fitting interval is determined according to a subinterval of a power control range; calculating a reduced value of the receiving power value according to the fitting algorithm; and determining a power control instruction according to the converted value. According to the power control method and device based on DSP processing provided by the embodiment of the invention, the power control interval is divided into a plurality of fitting intervals, the reduced value of the receiving power value is determined according to the fitting algorithm corresponding to the fitting interval in which the receiving power value is located, the floating point operation is converted into the integer operation, and the reduced value of the receiving power value is calculated in a segmented manner, so that the calculation precision is improved, the power adjustment is more accurate, and the system performance is improved.

Description

Power control method and device based on DSP processing

Technical Field

The embodiment of the invention relates to the technical field of communication, in particular to a power control method and device based on DSP processing.

Background

In uplink Power Control of a Long Term Evolution (LTE) system, a base station controls User Equipment (UE) to increase, decrease or maintain transmission Power through a Physical Downlink Control Channel (PDCCH) carrying a Transmit Power Control command (TPC). Specifically, the base station compares the measured received power with the target received power by using a built-in Data Signal Processor (DSP) according to the received UE transmitting power, determines a TPC command word according to the difference value of the measured received power and the target received power, sends Msg2 containing the TPC command word to the UE, and informs the UE to increase or decrease the transmitting power of the Msg 3. When processing a power control command word based on a DSP, the DSP needs to convert the received power of a base station into a power value of a dBm unit, in the prior art, when performing power conversion, the DSP directly calls a logarithmic function in an operating system library function to calculate the dBm value of the power to be converted, the data structure of the DSP is generally represented by integer, various operations are performed in a fixed-point mode, and if floating-point numbers are to be processed in the DSP, the floating-point numbers need to be represented by integer through a Q format for operation. Because the DSP floating point is converted into the fixed point and then the calculation precision is solved, the conversion value of the fixed point power value is directly calculated by using a logarithmic function, and the system error of about 2dB exists in an individual interval. In order to reduce the error, another conversion method stores the relation between the value to be converted and the dBm value in advance, the dBm value of the receiving power is obtained by using a table look-up method, the table look-up method is simple and easy to implement but occupies too large memory space, the method of changing the time by using the space consumes too much precious DSP memory resources, and the requirement of the table look-up method on the memory space is exponentially increased according to the requirement of the calculation precision, so that the precision is difficult to achieve within 1 dB.

Disclosure of Invention

Aiming at the defects in the prior art, the embodiment of the invention provides a power control method and a device based on DSP processing.

In a first aspect, an embodiment of the present invention provides a power control method based on DSP processing, including:

acquiring a receiving power value;

determining a fitting algorithm corresponding to the receiving power value according to a fitting interval in which the receiving power value is located, wherein the fitting interval is determined according to a subinterval of a power control range;

calculating a reduced value of the receiving power value according to the fitting algorithm;

and determining a power control instruction according to the converted value.

In a second aspect, an embodiment of the present invention provides a power control apparatus based on DSP processing, including:

the acquisition module is used for acquiring a receiving power value;

the processing module is used for determining a fitting algorithm corresponding to the receiving power value according to a fitting interval in which the receiving power value is located, wherein the fitting interval is determined according to a subinterval of a power control range;

the calculation module is used for calculating a conversion value of the receiving power value according to the fitting algorithm;

and the power control module is used for determining a power control instruction according to the converted value.

In a third aspect, an embodiment of the present invention provides an electronic device, including:

the processor and the memory are communicated with each other through a bus; the memory stores program instructions executable by the processor, the processor invoking the program instructions to perform a method comprising:

acquiring a receiving power value; determining a fitting algorithm corresponding to the receiving power value according to a fitting interval in which the receiving power value is located, wherein the fitting interval is determined according to a subinterval of a power control range; calculating a reduced value of the receiving power value according to the fitting algorithm; and determining a power control instruction according to the converted value.

In a fourth aspect, an embodiment of the present invention provides a storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the following method: acquiring a receiving power value; determining a fitting algorithm corresponding to the receiving power value according to a fitting interval in which the receiving power value is located, wherein the fitting interval is determined according to a subinterval of a power control range; calculating a reduced value of the receiving power value according to the fitting algorithm; and determining a power control instruction according to the converted value.

According to the power control method and device based on DSP processing provided by the embodiment of the invention, the power control interval is divided into a plurality of fitting intervals, the reduced value of the receiving power value is determined according to the fitting algorithm corresponding to the fitting interval in which the receiving power value is located, the floating point operation is converted into the integer operation, and the reduced value of the receiving power value is calculated in a segmented manner, so that the calculation precision is improved, the power adjustment is more accurate, and the system performance is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

FIG. 1 is a prior art library function performance graph;

FIG. 2 is an enlarged partial view of a prior art library function performance graph;

fig. 3 is a schematic flow chart of a power control method based on DSP processing according to an embodiment of the present invention;

FIG. 4 is a graph of the performance of a fitting algorithm provided by an embodiment of the present invention;

FIG. 5 is an enlarged view of a portion of a performance graph of a fitting algorithm provided by an embodiment of the present invention;

fig. 6 is a schematic diagram of a Msg3 power control flow based on DSP processing according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a power control device based on DSP processing according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Fig. 3 is a schematic flow chart of a power control method based on DSP processing according to an embodiment of the present invention, and as shown in fig. 3, the method includes:

step S11, acquiring a receiving power value;

in particular, when processing data in a DSP, it is necessary to convert the data to a fixed-point format, e.g., floating-point number 0.5 to 16384, scaled to Q15,in this way, in the DSP internal data processing, operation is performed with integer data such as 16384, and finally, the operation result is converted into floating-point data. In practical applications, the Q format may be adjusted according to the operation accuracy, for example, to Q12, and then the floating point value is represented by 2048, which is 0.5. In the power control system based on DSP processing, since the unit of power control is different from the unit of received power, for example, the unit of received power value is mW or W, and the unit of power control is dBm or dB, it is necessary to convert the received power value into the power unit value of power control processing_{A_int}And P_{A_float}Wherein P is_{A_int}For fixed value of received power value, P_{A_float}For receiving floating point value of power value, recording power unit value of power control processing as conversion value, including P_{B_int}And P_{B_float}Wherein P is_{B_int}Being fixed-point values of power conversion values, P_{B_float}Is the floating point value of the power reduction value. At P_{A_float}And P_{B_float}There is a logarithmic functional relationship between them, i.e. P_{B_float}＝f(P_{A_float})＝10log₁₀P_{A_float}B, where b is a logarithmic function parameter, and different DSPs correspond to different b, and in practical applications, the uplink value is generally a negative value, i.e. P, to the receiving end due to the path loss relationship_{B_float}Typically a negative value, such as-120 dBm.

When power control processing is required, firstly, the DSP obtains a receiving power value P_{A_float}Since the DSP internally operates the reception power value, the DSP also needs to calculate P here_{A_float}Conversion to P_{A_int}The Q format of the received power scaling accuracy may be set according to actual conditions, which is not limited in the embodiment of the present invention.

Taking the power control instruction of Msg3 sent by the base station to the UE as an example, the base station compares the power value of the signal sent by the UE to the base station last time with the power value of the signal sent by the base station expected to be received next time, and informs the UE to adjust the transmission power. For example, the base station receives a receiving signal carrying Msg1, and the DSP built in the base station obtains a receiving power value P_{A_float}，P_{A_float}The unit of the receiving power value is mW or W, the DSP fixedly initializes TPC command words in the memory of the DSP to the maximum value, and then when judging that the TPC command words need to be reconfigured to adjust the transmitting power, the DSP converts the receiving power value into a fixed point value P_{A_int}。

Step S12, determining a fitting algorithm corresponding to the receiving power value according to a fitting interval in which the receiving power value is located, wherein the fitting interval is determined according to a subinterval of a power control range;

specifically, the power control range is generally a power range with dB or dBm as a unit, the power control range is divided into at least one subinterval in advance, each subinterval corresponds to a fitting interval, and an end point value of the subinterval is a reduced value of an end point of the corresponding fitting interval. E.g. with a subinterval of [ P ]_{B_float}(i)，P_{B_float}(j)]Then its corresponding fitting interval is [ P ]_{A_float}(i)，P_{A_float}(j)]. Each fitting interval has its corresponding fitting algorithm, and then the DSP receives the power value P according to_{A_float}And determining a fitting algorithm corresponding to the fitting interval, namely the fitting algorithm to be used by the receiving power value, in the fitting interval. The fit interval here can be segmented with fixed-point power values in mW or W, for example a fit interval of [ P [ ]_{A_int}(i)，P_{A_int}(j)]So that the DSP can be based on the reception power value P_{A_int}And determining a fitting algorithm corresponding to the fitting interval in the fitting interval.

For example, if the power control range is between-120 dBm and-90 dBm, then [ -120dBm and-90 dBm ] will be preset]The division into a plurality of sub-intervals, e.g., [ -120dBm, -110dBm) into one sub-interval, [ -110dBm, -90dBm]For a subinterval, then determine the fitting interval corresponding to the subinterval, e.g., [ -120dBm, -110dBm) ] for a fitting interval of [10^-12mW，10^-11mW)，[-110dBm，-90dBm]The corresponding fitting interval is [10 ]^-11mW，10^-9mW]Thus, after the DSP obtains the receiving power value, the fitting interval where the DSP is located is directly judged according to the milliwatt value of the receiving power, and the fitting interval can also be 10 in practical application^-12mW，10^-11mW]Conversion to fixed point value interval of Q format, so that DSP obtainsAnd after the receiving power value is taken, converting the receiving power value into a fixed point value in a Q format, and then judging a fitting interval where the receiving power value is located according to the fixed point value, thereby determining a fitting algorithm to be used. No matter which two interval representation methods are adopted, the corresponding fitting algorithm is a fixed point calculation method.

Step S13, calculating a reduced value of the receiving power value according to the fitting algorithm;

specifically, a fitting algorithm corresponding to the reception power value is determined according to step S11, the fitting algorithm is pre-established according to the characteristics of the fitting interval corresponding to the fitting algorithm, and the reduced value of the reception power value can be obtained by calling the fitting algorithm. As the fitting algorithm needs to be used in the DSP, the data processed by the fitting algorithm are fixed point data, and the fitting algorithm is assumed to be P_{B_int}＝f’(P_{A_int}) First, the receiving power value P is set_{A_float}Conversion to fixed point form P_{A_int}Calculating a reduced value P according to a fitting algorithm of a fitting interval where the calculated value P is located_{B_int}Finally, P is added_{B_int}Conversion to floating point value P_{B_float}Thus, the received power P is obtained_{A_float}Reduced value of (P)_{B_float}。

And step S14, determining a power control instruction according to the converted value.

Specifically, after the reduced value of the receiving power value is determined, the power control instruction is determined according to the reduced value, and the power control operation is completed.

For example, the DSP determines a TPC power control instruction for adjusting the Msg3 according to the reduced value of the received power, and then sends Msg2 carrying the TPC power control instruction to the UE, thereby completing the power control operation. For example, table 1 is a TPC command word table carried by Msg2 of the PUSCH for scheduling, determines to adjust power according to the reduced value, then searches for a corresponding TPC command word to generate a TPC command, and then sends Msg2 carrying the power control command to the UE, thereby completing the power control operation.

Table 1 table of TPC command words carried by Msg2 for scheduled PUSCH

TPC command word	dB value
		0	-6
1	-4
		2	-2
3	0
		4	2
5	4
		6	6
7	8

According to the power control method based on DSP processing provided by the embodiment of the invention, the power control interval is divided into a plurality of fitting intervals, the reduced value of the receiving power value is determined according to the fitting algorithm corresponding to the fitting interval in which the receiving power value is located, the floating point operation is converted into the integer operation, and the reduced value of the receiving power value is calculated in a segmented manner, so that the calculation precision is improved, the power adjustment is more accurate, and the system performance is improved.

On the basis of the above embodiment, further, the fitting interval is divided according to the following steps:

dividing the power control range into at least one subinterval according to a logarithmic relation curve between an input power sample and an output converted power sample in the power control range, and determining a corresponding fitting interval according to the subinterval, wherein each fitting interval corresponds to a fitting algorithm.

To reduce the error between the floating point value of the result of the fixed point operation in the DSP and the floating point value calculated by the actual logarithmic function, the logarithmic function f (P) is required_{A_float}) Fitting is performed so that the fitting function f' (P) is obtained_{A_int}) The floating point value of the calculated conversion value approaches a logarithmic relation curve. Specifically, in the power control range, an input power sample and an output converted power sample are obtained, wherein the output converted power sample is a converted value of the input power sample, and a calculation method P is calculated_{B_float}＝f(P_{A_float})＝10log₁₀P_{A_float}B, obtaining an output converted power sample corresponding to the input power sample according to the formula, then obtaining a logarithmic relation curve between the input power sample and the output converted power sample according to the formula, dividing a power control range into a plurality of subintervals according to characteristics of the logarithmic relation curve, wherein each subinterval corresponds to a fitting interval, the subinterval represents an interval endpoint in a converted power unit, the fitting interval represents an interval endpoint in a power unit, the endpoint of the subinterval is a converted value of an endpoint value of the corresponding fitting interval, and each fitting interval corresponds to a fitting algorithm. In practical application, the Q formats of the received power are different, and the end point values of the fitting interval are different, so in the embodiment of the present invention, the power control subinterval end points are divided by the reduced power value, and the end point values of the fitting interval are determined according to the power control subinterval end points, so that the application range of the division of the fitting interval is wider, and the division basis is more reasonable.

In practical application, the reduced value can be divided into a plurality of intervals according to the logarithmic curve relation characteristic in the power control range, and since the logarithmic curve is a monotone curve, the power value corresponding to the endpoint of the subinterval is calculated according to the formula, and the endpoint value of the fitting interval can be obtained, so that a plurality of fitting intervals can be obtained. For example, according tof(P_{A_float}) And the first part of the curve is steeper and can be used as a fitting interval, and the second part of the curve is gentler and can be used as a second fitting interval. In practical application, the already divided fitting intervals can be converted into fitting intervals represented by fixed point values in a Q format.

For example, the power control range is [ -120dBm, -90dBm ], the power control range is divided into a plurality of subintervals, for example, the subintervals are [ -120dBm, -110dBm), [ -110dBm, -100dBm) and [ -100dBm, -90dBm, according to the logarithmic relation curve characteristic between the input power sample and the output converted power sample, and then the fitting intervals corresponding to the subintervals are calculated, each fitting interval corresponding to one fitting algorithm.

According to the power control method based on DSP processing provided by the embodiment of the invention, the power control range is divided into a plurality of fitting intervals according to the logarithmic relation curve between the input power value and the converted power value, each fitting interval corresponds to one fitting algorithm, so that the fitting algorithms are closer to the logarithmic relation curve, the calculation precision is improved, the power adjustment is more accurate, and the system performance is improved.

On the basis of the above embodiments, further, the fitting algorithm is determined according to the following steps:

and fitting a logarithmic relation curve corresponding to the fitting interval according to the input power sample corresponding to the fitting interval, and determining the fitting algorithm.

Specifically, the fitting interval divides the logarithmic relationship curve into a plurality of logarithmic relationship sub-curves, and in order to reduce the system error, each logarithmic relationship sub-curve needs to be fitted respectively, so as to determine the fitting algorithm corresponding to the fitting interval. In practical application, the input power sample can be preprocessed according to the corresponding logarithmic relation sub-curve characteristic of the fitting interval, sample points are down-sampled or interpolated, the fitting algorithm corresponding to the fitting interval is determined according to the preprocessed input power sample, and the problem of over-fitting or under-fitting is reduced.

For example, the subintervals of the power control range are [ -120dBm, -110dBm), [ -110dBm, -100dBm) and [ -100dBm, -80dBm), the input power samples in the subintervals of [ -120dBm, -110dBm) are converted into fixed-point values in a Q format according to the characteristics of the logarithmic relationship subplots corresponding to the subintervals, then the fixed-point values are shifted to the right by 3 bits, that is, a sampling point is taken from every 8 input power samples, the converted power value corresponding to the floating-point value of the sampling point is calculated, so that the input power samples and the output converted power samples corresponding to the fitting intervals can be obtained, and then the fitting algorithm of the fitting intervals is determined according to the fixed-point values of the input power samples and the fixed-point values of the output converted power samples and the characteristics of the logarithmic relationship subplots corresponding to the intervals of [ -120dBm, -110 dBm). Similarly, converting the input power samples in the range of [ -110dBm, -100dBm) into fixed point values in a Q format, then shifting the fixed point values to the right by 6 bits, namely taking a sampling point from every 64 input power samples, and calculating the converted power value corresponding to the floating point value of the sampling point, so that the input power samples and the output converted power samples corresponding to the fitting range can be obtained; converting input power samples in an interval of [ -100dBm, -80dBm) into fixed point values in a Q format, then shifting the fixed point values to the right by 9 bits, namely taking a sampling point for every 512 input power samples, calculating a converted power value corresponding to a floating point value of the sampling point, so as to obtain input power samples and output converted power samples corresponding to a fitting interval, and then determining a fitting algorithm corresponding to the fitting interval according to the fixed point values of the input power samples and the fixed point values of the output converted power samples in the fitting interval.

According to the power control method based on DSP processing provided by the embodiment of the invention, the logarithmic relation curve corresponding to the fitting interval is fitted according to the input power sample corresponding to the fitting interval, and the fitting algorithm is determined, so that the fitting algorithm is closer to the logarithmic relation curve, the calculation precision is improved, the power adjustment is more accurate, and the system performance is improved.

On the basis of the foregoing embodiments, further, the determining the fitting algorithm includes:

calculating an output converted power parameter for the input power samples;

if the difference value between the output conversion power parameter and the output conversion power sample is smaller than a preset threshold value, determining an input power-conversion power relation table according to the input power parameter and the output conversion power parameter;

and if the difference value between the output converted power parameter and the output converted power sample is greater than or equal to a preset threshold value, determining a fitting coefficient of the logarithmic relation curve according to the input power sample, and determining a fitting polynomial according to the fitting coefficient.

In particular, according to the formula P_{B_int}＝f(P_{A_int})＝10log₁₀P_{A_int}B calculating input power samples P_{A_float}Fixed point value P of_{A_int}Corresponding output reduced power parameter P_{B_int}Converting the constant point value of the output converted power parameter into a floating point value P_{B_float}Then according to formula P_{B_float}＝f(P_{A_float})＝10log₁₀P_{A_float}B, calculating the output converted power sample floating point value and the output converted power parameter floating point value, calculating the difference value of the two floating point values, wherein the difference value is the system error, and if the difference value is smaller than a preset threshold value, for example, the preset threshold value is set to be 0.5dBm, namely the calculation accuracy required by the fitting algorithm is +/-0.5 dBm, then the input power parameter fixed point value P is used_{A_int}And its corresponding output reduced power parameter fixed point value P_{B_int}And (4) making an input power-reduced power relation table and storing the table in a Const table in a DSP memory.

If the difference is judged to be not smaller than the preset threshold value, the system error is large, the converted power value cannot be directly calculated according to a formula, at the moment, the fitting coefficient of a logarithmic relation curve is determined according to the input power sample corresponding to the fitting interval, and the fitting polynomial is determined according to the fitting coefficient. For example, fitting the polynomial to P_Q＝P₁*xⁿ+P₂*x^n-1+...+P_nx+P_n+1In which P is_QAs a fixed-point value of the power conversion value, P_nTo fit the coefficients of the polynomial, x is the fixed point value of the input power value. Determining a fitting coefficient according to the corresponding logarithmic relation curve of the fitting interval, thereby determining a fitting polynomial of the fitting interval, wherein the fitting polynomial of each fitting interval and the Const table form a fitting algorithm P_{B_int}＝f’(P_{A_int}). Thus, if obtainedKnowing the fixed point value of the received power value, according to a function f' (P)_{A_int}) A fixed point value of the reduced value of the reception power value is obtained.

For example, the power control range is: -140dBm, -80dBm, power subintervals of-140 dBm, -120dBm, -110dBm, -100dBm), and-100 dBm, -80dBm), corresponding fitting intervals of C1, C2, C3, and C4.

In the fitting interval C1, the system error can be less than 0.5dBm by adopting a table lookup method, the logarithmic relation curve in the fitting interval C1 is steeper, the effect of the polynomial fitting method is not good, the precision is not high, if too high-order polynomial fitting is used, the processing time is wasted, the table lookup method only needs to make a constant table for 128 points, the memory occupies little space, so that the reduced values of the input power samples in the fitting interval C1 are directly calculated in the C1 interval and are stored in a Const table in a DSP memory in a one-to-one correspondence manner, and when the receiving power value is judged to be in the C1 fitting interval, the reduced value of the receiving power value is searched by adopting the table lookup method. It should be noted that the calculation power conversion value here is obtained by the formula P outside the DSP_{B_float}＝f(P_{A_float})＝10log₁₀P_{A_float}B calculating a reduced value, then adding P_{A_float}And P_{B_float}Conversion to P_{A_int}And P_{B_int}And storing the result in a Const table in the DSP memory.

In the fitting intervals C2, C3, and C4, an nth-order polynomial fitting logarithmic relation curve may be used, and through analysis, if the same nth-order polynomial fitting logarithmic relation curve is used in C2, C3, and C4, the system error is greater than 0.5dBm, and therefore, C2, C3, and C4 are respectively used to correspond to an nth-order polynomial, and in order to achieve code unification, the scaling precision of the fitting polynomial coefficients is adjusted according to the DSP data range, for example, the Q format used for the fitting coefficients is Q27, Q25, Q25, and Q8, and the scaling format used for the power reduction value is Q8:

in a fitting interval C2, fitting a power conversion value by using a third-order polynomial and fitting a coefficient [ P₁，P₂，P₃，P₄]＝[881，67345，8228592，31498]And by calculating the formula P_Q＝P₁*x³-P₂*x²+P₃x-P₄Calculating a reduced value;

in a fitting interval C3, fitting a power conversion value by using a third-order polynomial and fitting a coefficient [ P₁，P₂，P₃，P₄]＝[527，48730，7089690，29039]And by calculating the formula P_Q＝P₁*x³-P₂*x²+P₃x-P₄Calculating a reduced value;

in a fitting interval C4, fitting a power conversion value by using a third-order polynomial and fitting a coefficient [ P₁，P₂，P₃，P₄]＝[748，59227，7615501，26767]And by calculating the formula P_Q＝P₁*x³-P₂*x²+P₃x-P₄And calculating a reduced value.

According to the method, the fitting algorithm of all fitting intervals is determined, when the DSP acquires the receiving power value, the fitting interval where the DSP is located is judged, if the DSP is in the interval C1, the reduced value is output by searching a Const table stored in a DSP memory, and if the DSP is in the interval C2, C3 or C4, the DSP calculates the reduced value according to a third-order polynomial corresponding to the interval.

Fig. 1 is a library function performance diagram of the prior art, fig. 4 is a performance diagram of a fitting algorithm provided in an embodiment of the present invention, as shown in fig. 1 and fig. 4, the abscissa is a received power value adjusted by a DSP, the scaling format is Q33, the ordinate is a power dBm value, the thin curve is a logarithmic relation curve, the thick curve in fig. 4 is a fitting algorithm curve, the thick curve in fig. 1 is a library function curve, and it can be visually seen from fig. 1 and fig. 4 that the fitting algorithm of the embodiment of the present invention more approximates the logarithmic relation curve. More specifically, fig. 5 is a partially enlarged view of a performance graph of a fitting algorithm provided in an embodiment of the present invention, fig. 2 is a partially enlarged view of a performance graph of a library function in the prior art, an abscissa is a received power value adjusted by a DSP, a scaling format is Q33, and an ordinate is a power dBm value, which can be intuitively seen from fig. 2 and fig. 5, and a system error of the fitting algorithm in the embodiment of the present invention is significantly smaller than that of the library function algorithm.

According to the power control method based on DSP processing provided by the embodiment of the invention, different fitting algorithms are set for different fitting intervals, floating point operation is converted into integer operation, and the converted value of the receiving power value is calculated in a segmented manner, so that the calculation precision is improved, the power adjustment is more accurate, and the system performance is improved.

On the basis of the foregoing embodiments, further, the determining a power control instruction according to the reduced value includes:

calculating the difference value between the converted value and the target power;

and determining a power control instruction according to the difference value.

Specifically, the DSP calculates a difference between the converted received power value and the target value, for example, the difference is-4 dB, and determines a power control command according to the difference, for example, setting the TPC command word to 1.

Taking the power control instruction sent by the base station to the UE by the Msg3 as an example, the base station determines a TPC command word according to the received power of the Msg1 sent by the UE and the target value of the received power of the Msg3 sent by the UE, then the base station sends the Msg2 carrying the TPC command word to the UE, and the UE determines the transmit power of the Msg3 according to the received Msg2 and sends the Msg3 to the base station by the transmit power. Fig. 6 is a schematic diagram of a power control flow of Msg3 based on DSP processing according to an embodiment of the present invention, and as shown in fig. 6, the flow includes:

step S1: fixedly initializing TPC command words in a DSP memory to 7;

step S2: judging whether an OM switch is configured to adjust power control by the maximum command word, if so, jumping to the step S5, otherwise, executing the step S3;

step S3: calculating a reduced value of the receiving power value; the calculation method comprises the following steps: acquiring a receiving power value; determining a fitting algorithm corresponding to the receiving power value according to a fitting interval in which the receiving power value is located, wherein the fitting interval is determined according to a subinterval of a power control range; calculating a reduced value of the receiving power value according to the fitting algorithm;

step S4: calculating the difference between the converted value of the receiving power value and the target value;

step S5: a TPC command is generated.

In practical application, the Msg3 power control characteristics are analyzed, the target value of power adjustment is between-120 dBm and-90 dBm, and the maximum adjustment value of the Tpc command word of the Msg3 is-6 and + 8. Therefore, the calculated power range can meet the requirement of-128 dBm to-83 dBm, namely the power control range is-128 dBm to-83 dBm.

If the DSP calculation precision is required to be +/-0.5 dBm, namely the preset threshold value is 0.5dBm, fitting a logarithmic relation curve aiming at the power control range simulation mathematical model, using an n-order polynomial to fit the characteristics of the logarithmic relation curve, and performing simulation analysis, wherein if 5-order polynomial fitting is adopted in the whole range, the error is +/-2 dBm; if two sections are divided, the first section is used as a table, the second section adopts 5-order polynomial fitting, the error of the scheme is small, but the performance is poor at the boundary of-120 dBm, the error is nearly 2dBm and still does not meet the preset threshold, the second section is continuously divided into a plurality of sections, preferably, the power control section is divided into 4 subintervals, [ -141dBm, -120dBm), [ -120dBm, -110dBm), [ -110dBm, -100dBm) and [ -100dBm, -80dBm), and the corresponding fitting section is as follows: [1,128), [128, 1024), [1024, 10240) and [10240, + ∞ ]), wherein the corresponding fitting interval can be determined according to practical situations, and the end point values of the fitting intervals corresponding to different calibration precisions are different, but the power control subintervals are the same. Carrying out table fitting on an interval of [ -141dBm, -120 dBm); -120dBm, -110dBm) interval is fitted with a polynomial of order 3; -110dBm, -100dBm) interval is fitted with a polynomial of order 3; -100dBm, -80dBm) interval is fitted with a 3 rd order polynomial; and according to the characteristics of a logarithmic relation curve, different sampling periods are used for input power samples in different fitting intervals, and sample values are reduced to a fixed range, so that the polynomial parameter characteristics are consistent, namely Q formats of polynomial coefficients are uniform, codes can be unified, the processing speed is further increased, the table 2 is a time-consuming comparison table of a library function and a fitting algorithm, the table 2 can show that the calculation precision can reach +/-0.5 dBm through the fitting algorithm, the DSP processing speed is within 320 cycles, and the DSP performance is greatly improved.

TABLE 2 comparison of library functions to fitting algorithm time consumption

	Library function	Fitting algorithm	Optimizing front-to-back contrast
				Single user calculation of reduced value coding time	2600 cycle	320 cycle	88％

According to the power control method based on DSP processing provided by the embodiment of the invention, the calibration precision of the fitting polynomial coefficient is adjusted according to the DSP data range, the sampling point is reduced according to the characteristic of the logarithmic relation curve, the conversion precision can be maximally improved while the data overflow is avoided, the floating point operation is converted into the integer operation while the precision is ensured, the processing speed is improved, the code flow can be unified, and the code implementation and maintenance are facilitated.

Fig. 7 is a schematic structural diagram of a power control device based on DSP processing according to an embodiment of the present invention, and as shown in fig. 7, the power control device includes: an obtaining module 71, a processing module 72, a calculating module 73, and a power control module 74, wherein: the obtaining module 71 is configured to obtain a receiving power value; the processing module 72 is configured to determine a fitting algorithm corresponding to the received power value according to a fitting interval in which the received power value is located, where the fitting interval is determined according to a subinterval of a power control range; the calculating module 73 is configured to calculate a reduced value of the receiving power value according to the fitting algorithm; the power control module 74 is configured to determine a power control instruction according to the reduced value.

In particular, the amount of the solvent to be used,the obtaining module 71 obtains the receiving power value P_{A_float}In practical applications, the obtaining module 71 further needs to convert the receiving power value into the fixed point format P_{A_int}Then the acquisition module 71 compares P_{A_int}And sending the power control range to the processing module 72, wherein the processing module 72 divides the power control range into at least one sub-interval in advance, each sub-interval corresponds to one fitting interval, the endpoint value of each sub-interval is the conversion value of the endpoint of the corresponding fitting interval, and then a fitting algorithm is determined for each fitting interval. The calculation module 73 is based on P_{A_int}Determining a fitting algorithm P in the fitting interval_{B_int}＝f’(P_{A_int}) Then calculating a reduced value P according to a fitting algorithm_{B_int}And converting the value P_{B_int}Sending to the power control module 74, the power control module 74 calculating the P according to the converted value_{B_int}Is converted from the floating point value of P_{B_float}And determining a power control instruction. The functions of the apparatus provided in the embodiment of the present invention refer to the above method embodiments specifically, and are not described herein again.

According to the power control device based on DSP processing provided by the embodiment of the invention, the power control interval is divided into a plurality of fitting intervals, the reduced value of the receiving power value is determined according to the fitting algorithm corresponding to the fitting interval in which the receiving power value is located, the floating point operation is converted into the integer operation, and the reduced value of the receiving power value is calculated in a segmented manner, so that the calculation precision is improved, the power adjustment is more accurate, and the system performance is improved.

Specifically, in the power control range, an input power sample and an output converted power sample are obtained, wherein the output converted power sample is a converted value of the input power sample, and a calculation method P is calculated_{B_float}＝f(P_{A_float})＝10log₁₀P_{A_float}B, obtaining an output converted power sample corresponding to the input power sample according to the formula, then obtaining a logarithmic relation curve between the input power sample and the output converted power sample according to the formula, dividing a power control range into a plurality of subintervals according to characteristics of the logarithmic relation curve, wherein each subinterval corresponds to a fitting interval, the subinterval represents an interval endpoint in a converted power unit, the fitting interval represents an interval endpoint in a power unit, the endpoint of the subinterval is a converted value of an endpoint value of the corresponding fitting interval, and each fitting interval corresponds to a fitting algorithm. In practical application, the reduced value can be divided into a plurality of intervals according to the logarithmic curve relation characteristic in the power control range, and since the logarithmic curve is a monotone curve, the power value corresponding to the endpoint of the subinterval is calculated according to the formula, and the endpoint value of the fitting interval can be obtained, so that a plurality of fitting intervals can be obtained.

In practical application, the already divided fitting intervals can be converted into fitting intervals represented by fixed point values in a Q format. The functions of the apparatus provided in the embodiment of the present invention refer to the above method embodiments specifically, and are not described herein again.

According to the power control device based on DSP processing provided by the embodiment of the invention, the power control range is divided into a plurality of fitting intervals according to the logarithmic relation curve between the input power value and the converted power value, each fitting interval corresponds to one fitting algorithm, so that the fitting algorithms are closer to the logarithmic relation curve, the calculation precision is improved, the power adjustment is more accurate, and the system performance is improved.

Specifically, the fitting interval divides the logarithmic relationship curve into a plurality of logarithmic relationship sub-curves, and in order to reduce the system error, each logarithmic relationship sub-curve needs to be fitted respectively, so as to determine the fitting algorithm corresponding to the fitting interval. In practical application, the input power sample can be preprocessed according to the corresponding logarithmic relation sub-curve characteristic of the fitting interval, sample points are down-sampled or interpolated, the fitting algorithm corresponding to the fitting interval is determined according to the preprocessed input power sample, and the problem of over-fitting or under-fitting is reduced. The functions of the apparatus provided in the embodiment of the present invention refer to the above method embodiments specifically, and are not described herein again.

According to the power control device based on DSP processing provided by the embodiment of the invention, the logarithmic relation curve corresponding to the fitting interval is fitted according to the input power sample corresponding to the fitting interval, and the fitting algorithm is determined, so that the fitting algorithm is closer to the logarithmic relation curve, the calculation precision is improved, the power adjustment is more accurate, and the system performance is improved.

Fig. 8 is a schematic structural diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 8, the electronic device includes: a processor (processor)801, a memory (memory)802, and a bus 803;

wherein, the processor 801 and the memory 802 complete the communication with each other through the bus 803;

the processor 801 is configured to call program instructions in the memory 802 to perform the methods provided by the above-described method embodiments, including, for example: acquiring a receiving power value; determining a fitting algorithm corresponding to the receiving power value according to a fitting interval in which the receiving power value is located, wherein the fitting interval is determined according to a subinterval of a power control range; calculating a reduced value of the receiving power value according to the fitting algorithm; and determining a power control instruction according to the converted value.

An embodiment of the present invention discloses a computer program product, which includes a computer program stored on a non-transitory computer readable storage medium, the computer program including program instructions, when the program instructions are executed by a computer, the computer can execute the methods provided by the above method embodiments, for example, the method includes: acquiring a receiving power value; determining a fitting algorithm corresponding to the receiving power value according to a fitting interval in which the receiving power value is located, wherein the fitting interval is determined according to a subinterval of a power control range; calculating a reduced value of the receiving power value according to the fitting algorithm; and determining a power control instruction according to the converted value.

Embodiments of the present invention provide a non-transitory computer-readable storage medium, which stores computer instructions, where the computer instructions cause the computer to perform the methods provided by the above method embodiments, for example, the methods include: acquiring a receiving power value; determining a fitting algorithm corresponding to the receiving power value according to a fitting interval in which the receiving power value is located, wherein the fitting interval is determined according to a subinterval of a power control range; calculating a reduced value of the receiving power value according to the fitting algorithm; and determining a power control instruction according to the converted value.

Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.

The above-described embodiments of the apparatuses and devices are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.

Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the embodiments of the present invention, and are not limited thereto; although embodiments of the present invention have been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A power control method based on DSP processing is characterized by comprising the following steps:

acquiring a receiving power value;

calculating a reduced value of the receiving power value according to the fitting algorithm, specifically comprising:

converting the data form of the receiving power value to obtain a fixed-point form receiving power value, wherein the receiving power value is a floating-point form receiving power value; converting the fixed-point form receiving power value into a power unit value for power control processing to obtain a target receiving power value, and calculating a conversion value of the target receiving power value according to the fitting algorithm, wherein the data form of the conversion value is a fixed-point form, the unit of the fixed-point form receiving power value is mW or W, and the unit of the target receiving power value is dBm or dB;

and determining a power control instruction according to the converted value.

2. The method of claim 1, wherein the fitting interval is divided according to the following steps:

3. The method of claim 2, wherein the fitting algorithm is determined according to the following steps:

4. The method of claim 3, wherein the determining the fitting algorithm comprises:

calculating an output converted power parameter for the input power samples;

if the difference value between the output conversion power parameter and the output conversion power sample is smaller than a preset threshold value, determining an input power-conversion power relation table according to an input power parameter and the output conversion power parameter;

5. The method of claim 1, wherein determining the power control instruction according to the reduced value comprises:

and determining a power control instruction according to the difference value.

6. A power control device based on DSP processing is characterized by comprising:

the acquisition module is used for acquiring a receiving power value;

a calculating module, configured to calculate a reduced value of the received power value according to the fitting algorithm, where the calculating module is specifically configured to:

7. The apparatus of claim 6, wherein the fitting interval is divided according to the following steps:

8. The apparatus of claim 7, wherein the fitting algorithm is determined according to the following steps:

9. An electronic device, comprising:

the processor and the memory are communicated with each other through a bus; the memory stores program instructions executable by the processor, the processor invoking the program instructions to perform the method of any of claims 1 to 5.

10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the method according to any one of claims 1 to 5.