CN115987733A - Soft value determination method and device of SOQPSK (Soft offset Quadrature phase Shift keying) signal and communication equipment - Google Patents

Soft value determination method and device of SOQPSK (Soft offset Quadrature phase Shift keying) signal and communication equipment Download PDF

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CN115987733A
CN115987733A CN202211524555.7A CN202211524555A CN115987733A CN 115987733 A CN115987733 A CN 115987733A CN 202211524555 A CN202211524555 A CN 202211524555A CN 115987733 A CN115987733 A CN 115987733A
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value
branch metric
states
symbol
soft
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孙振超
许振�
李朝阳
黎德文
崔伟
何裕舒
彭刚
夏冰
张渊
梁军
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722th Research Institute of CSIC
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Abstract

The disclosure provides a soft value determination method and device for an SOQPSK signal and communication equipment. The method comprises the following steps: respectively carrying out matched filtering on the received SOQPSK signal through a first matched filter and a second matched filter to obtain 2 matched filtering results Y of the ith symbol 0 And Y 1 (ii) a Will Y 0 The result of subtraction with the local matched filter result of the first matched filter in 8 states is the absolute value and then divided by the coefficient V 0,i Obtaining a first value, and adding Y 1 The result of subtraction with the local matched filter result of the second matched filter in 8 states is respectively used for taking the absolute value and dividing the absolute value by the coefficient V 1,i Obtaining a second value, and adding the first value and the second value in the same state to obtain a real part, so as to obtain branch metric values in 8 states; determining a first soft value component and a second soft value component according to the maximum value of the branch metric values under 8 states; and aligning the first soft value component and the second soft value component and then adding to obtain the soft value of the ith symbol of the SOQPSK signal.

Description

Soft value determination method and device of SOQPSK (Soft offset Quadrature phase Shift keying) signal and communication equipment
Technical Field
The present disclosure relates to the field of communications technologies, and in particular, to a method and an apparatus for determining a soft value of an SOQPSK signal, and a communication device.
Background
Shaping Offset Quadrature Phase Shift Keying (SOQPSK) is a continuous Phase modulation scheme developed by OQPSK.
The demodulation process of the SOQPSK signal generally includes two major steps, the first step determines soft values of the SOQPSK signal, and the second step performs demodulation of the SOQPSK signal using viterbi decoding, soft output viterbi decoding (SOVA), modified SOVA, and other algorithms based on the determined soft values of the SOQPSK signal.
In the related art, soft values of the SOQPSK signal are generally determined based on a maximum path algorithm. However, the method has huge computation amount and large consumed resource amount, and is not suitable for engineering practice.
Disclosure of Invention
The embodiment of the disclosure provides a method and a device for determining soft values of an SOQPSK signal and communication equipment. The technical scheme is as follows:
at least one embodiment of the present disclosure provides a method for determining soft values of an SOQPSK signal, the method including:
respectively carrying out matched filtering on the received SOQPSK signal through a first matched filter and a second matched filter to obtain 2 matched filtering results Y of the ith symbol 0 And Y 1 I is greater than 2 and is a positive integer, and the filter coefficients of the first matched filter and the second matched filter are respectively P 0 (t) and P 1 (t)；
Obtaining the P 0 (t) coefficient V in 8 states 0,i And said P 1 (t) coefficients V in 8 states 1,i The 8 states refer to 8 states formed by the i-2 th symbol, the i-1 th symbol and the i-1 th symbol which are respectively 0 and 1;
the Y is 0 The absolute value of the subtraction result of the local matched filtering result of the first matched filter in the 8 states is divided by the V 0,i Obtaining a first value, and adding Y 1 The absolute value of the subtraction result of the local matched filter results of the second matched filter in the 8 states is divided by the V 1,i Obtaining a second value, and adding the first value and the second value in the same state to obtain a real part, so as to obtain branch metric values in 8 states, where the local matched filtering result in 8 states is a matched filtering result in 8 states corresponding to the SOQPSK signal transmitted in an ideal state;
determining a first soft value component and a second soft value component according to the maximum value of the branch metric values under the 8 states;
aligning the first soft value component and the second soft value component and then adding to obtain the soft value of the ith symbol of the SOQPSK signal.
Optionally, the P 0 The coefficients in 8 states corresponding to (t) are obtained according to the following formula:
V 0,i ＝0.5[(b i-1 +b i )+j(-1) i (b i-1 -b i )],
wherein, b i Is the value of the ith symbol, b i-1 The value of the (i-1) th symbol is taken, and the coefficients when the (i-2) th symbol takes 0 and 1 are the same;
the P is 1 The coefficients in the 8 states corresponding to (t) are obtained according to the following formula:
V 1,i ＝sqrt(2)/8*[3b i-1 -b i-2 b i-1 b i +b i-2 +b i +j*(-1) i (3b i-1 -b i -2b i-1 b i -b i-2 -b i )]，
wherein, b i-2 And taking the value of the (i-2) th symbol.
Optionally, the local matched filtering result of the first matched filter in the 8 states is obtained according to the following formula:
R 00 V 0,i +R 10 V 1,i ；
wherein R is 00 Represents the adoption of said first matched filter pair P 0 (t) the result of the matched filtering, R 10 Representing the use of said first matched filter pair P 1 (t) the result of performing matched filtering;
the local matched filtering result of the second matched filter in the 8 states is obtained according to the following formula:
R 01 V 0,i +R 11 V 1,i ；
wherein R is 01 Representing the use of said second matched filter pair P 0 (t) the result of the matched filtering, R 11 Representing the use of said second matched filter pair P 1 (t) the result of performing matched filtering.
Optionally, the determining a first soft value component according to a maximum value of the branch metric values in the 8 states includes:
the branch metric values under the 8 states are sequenced according to the sequence of (000, 010, 100, 110, 001, 011, 101, 111), and 3 bits of each serial number respectively represent the values of the (i-2) th symbol, the (i-1) th symbol and the (i) th symbol;
determining the maximum value of the branch metric values in the 8 states;
determining that the sign of the first soft value component is negative if the maximum value is in a first set of branch metric values, determining that the sign of the first soft value component is positive if the maximum value is in a second set of branch metric values, the first set of branch metric values corresponding to sequence numbers (000, 010, 100, 110), the second set of branch metric values corresponding to sequence numbers (001, 011, 101, 111);
subtracting the 1 st branch metric value and the 3 rd branch metric value of the group in which the maximum value is positioned and taking an absolute value, and subtracting the 2 nd branch metric value and the 4 th branch metric value of the group in which the maximum value is positioned and taking an absolute value;
and adding the two absolute values, and assigning a determined symbol to the addition result to obtain the first soft value component.
Optionally, the determining a second soft value component according to a maximum value of the branch metric values in the 8 states includes:
sorting the branch metric values under the 8 states according to the sequence of (000, 001, 100, 101, 010, 011, 110, 111), wherein 3 bits of each serial number respectively represent the values of the i-2 th symbol, the i-1 th symbol and the i-th symbol;
determining the maximum value of the branch metric values in the 8 states;
if the maximum value is in a third set of branch metric values, determining that the sign of the second soft value component is negative, if the maximum value is in a fourth set of branch metric values, determining that the sign of the second soft value component is positive, wherein the third set of branch metric values corresponds to a sequence number (000, 001, 100, 101), and the fourth set of branch metric values corresponds to a sequence number (010, 011, 110, 111);
subtracting the 1 st branch metric value and the 3 rd branch metric value of the group in which the maximum value is positioned and taking an absolute value, and subtracting the 2 nd branch metric value and the 4 th branch metric value of the group in which the maximum value is positioned and taking an absolute value;
and adding the two absolute values, and assigning a determined symbol to the addition result to obtain the second soft value component.
At least one embodiment of the present disclosure provides an apparatus for determining soft values of an SOQPSK signal, the apparatus including:
a matched filtering module for matched filtering the received SOQPSK signal by a first matched filter and a second matched filter to obtain 2 matched filtering results Y of the ith symbol 0 And Y 1 I is greater than 2 and is positiveThe filter coefficients of the first matched filter and the second matched filter are respectively P 0 (t) and P 1 (t)；
An acquisition module for acquiring the P 0 (t) coefficient V in 8 states 0,i And said P 1 (t) coefficient V in 8 states 1,i The 8 states refer to 8 states formed by the i-2 th symbol, the i-1 th symbol and the i-1 th symbol which are respectively 0 and 1;
a branch metric module for dividing Y into two values 0 The absolute value of the subtraction result of the local matched filtering result of the first matched filter in the 8 states is divided by the V 0,i Obtaining a first value, and taking Y 1 The absolute value of the subtraction result of the local matched filtering results of the second matched filter in the 8 states is divided by the V 1,i Obtaining a second value, and adding the first value and the second value in the same state to obtain a real part, so as to obtain branch metric values in 8 states, where the local matched filtering result in 8 states is a matched filtering result in 8 states corresponding to the SOQPSK signal transmitted in an ideal state;
a soft value determining module, configured to determine a first soft value component and a second soft value component according to a maximum value of the branch metric values in the 8 states; aligning the first soft value component and the second soft value component and then adding to obtain the soft value of the ith symbol of the SOQPSK signal.
Optionally, the obtaining module is configured to determine P according to the following formula 0 (t) coefficients in the corresponding 8 states:
V 0,i ＝0.5[(b i-1 +b i )+j(-1) i (b i-1 -b i )],
wherein, b i Is the value of the ith symbol, b i-1 Taking the value of the (i-1) th symbol, wherein the coefficients of the (i-2) th symbol when taking 0 and 1 are the same;
determining said P according to the following formula 1 (t) coefficients in the corresponding 8 states:
V 1,i ＝sqrt(2)/8*[3b i-1 -b i-2 b i-1 b i +b i-2 +b i +j*(-1) i (3b i-1 -b i -2b i-1 b i -b i-2 -b i )]，
wherein, b i-2 And taking the value of the (i-2) th symbol.
Optionally, the soft value determining module is configured to:
sorting the branch metric values under the 8 states according to the sequence of (000, 010, 100, 110, 001, 011, 101, 111), wherein 3 bits of each serial number respectively represent the values of the i-2 th symbol, the i-1 th symbol and the i-th symbol; determining the maximum value of the branch metric values under the 8 states; determining that the sign of the first soft value component is negative if the maximum value is in a first set of branch metric values, determining that the sign of the first soft value component is positive if the maximum value is in a second set of branch metric values, the first set of branch metric values corresponding to sequence numbers (000, 010, 100, 110), the second set of branch metric values corresponding to sequence numbers (001, 011, 101, 111); subtracting the 1 st branch metric value and the 3 rd branch metric value of the group in which the maximum value is positioned and taking an absolute value, and subtracting the 2 nd branch metric value and the 4 th branch metric value of the group in which the maximum value is positioned and taking an absolute value; adding the two absolute values, and assigning a determined symbol to the addition result to obtain the first soft value component;
the branch metric values under the 8 states are sequenced according to the sequence of (000, 001, 100, 101, 010, 011, 110, 111), and 3 bits of each serial number respectively represent the values of the (i-2) th symbol, the (i-1) th symbol and the (i) th symbol; determining the maximum value of the branch metric values in the 8 states; if the maximum value is in a third set of branch metric values, determining that the sign of the second soft value component is negative, if the maximum value is in a fourth set of branch metric values, determining that the sign of the second soft value component is positive, wherein the third set of branch metric values corresponds to a sequence number (000, 001, 100, 101), and the fourth set of branch metric values corresponds to a sequence number (010, 011, 110, 111); subtracting the 1 st branch metric value and the 3 rd branch metric value of the group in which the maximum value is positioned and taking an absolute value, and subtracting the 2 nd branch metric value and the 4 th branch metric value of the group in which the maximum value is positioned and taking an absolute value; and adding the two absolute values, and assigning a determined symbol to the addition result to obtain the second soft value component.
At least one embodiment of the present disclosure provides a communication device including a processor and a memory, the memory storing at least one program code, the program code being loaded and executed by the processor to implement the method for soft value determination of SOQPSK signal as described above.
At least one embodiment of the present disclosure provides a computer-readable storage medium having at least one program code stored therein, the program code being loaded and executed by a processor to implement the soft value determination method for SOQPSK signal as described in any of the previous items.
The technical scheme provided by the embodiment of the disclosure has the following beneficial effects:
in the embodiment of the disclosure, the SOQPSK signal is matched and filtered, then the absolute value is subtracted from the matched and filtered result in 8 states corresponding to the SOQPSK signal transmitted in an ideal state, and then the subtracted result is divided by a coefficient to obtain a first value and a second value, the first value and the second value in the same state are added to obtain a real part, branch metric values in 8 states are obtained, two soft value components are determined according to the 8 branch metric values, and then the two soft value components are superimposed to obtain a soft value. The scheme has small operand and small consumed resource amount, and is suitable for engineering practice. In addition, the accuracy of the soft value is increased by superposing the two soft value components, and the demodulation capacity is correspondingly improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is apparent that the drawings in the description below are only some embodiments of the present disclosure, and it is obvious for those skilled in the art that other drawings may be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a soft value determination method for an SOQPSK signal according to an embodiment of the present disclosure;
fig. 2 is a flowchart of a soft value determination method for an SOQPSK signal according to an embodiment of the present disclosure;
fig. 3 is a block diagram of an apparatus for determining soft values of an SOQPSK signal according to an embodiment of the present disclosure;
fig. 4 is a block diagram of a communication device according to an embodiment of the present disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," "third," and similar terms in the description and claims of the present disclosure are not intended to indicate any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprise" or "comprises", and the like, means that the element or item listed before "comprises" or "comprising" covers the element or item listed after "comprising" or "comprises" and its equivalents, and does not exclude other elements or items.
Fig. 1 is a flowchart of a method for determining soft values of an SOQPSK signal according to an embodiment of the present disclosure.
Referring to fig. 1, the method includes:
101: respectively carrying out matched filtering on the received SOQPSK signal through a first matched filter and a second matched filter to obtain 2 matched filtering results Y of the ith symbol 0 And Y 1 I is a positive integer greater than 2, and the filter coefficients of the first matched filter and the second matched filter are respectively P 0 (t) and P 1 (t)。
The soft value determining method for the SOQPSK signal provided by the embodiment of the present disclosure is performed by a receiving end device in a communication system.
In the embodiment of the present disclosure, when performing matched filtering on an SOQPSK signal, the length of an input signal is greater than 1 symbol, and 2 matched filtering results Y of the ith symbol are obtained 0 And Y 1 ，Y 0 And Y 1 Are all plural.
102: obtaining the P 0 (t) coefficients V in 8 states 0,i And said P 1 (t) coefficient V in 8 states 1,i The 8 states refer to 8 states consisting of the i-2 th symbol, the i-1 th symbol and the i-1 th symbol which are respectively 0 and 1.
The SOQPSK signal Y can be decomposed according to the following formula: y = P 0 (t)V 0,i +P 1 (t)V 1,i . It can be seen that V 0,i Is and the filter coefficient P 0 (t) coefficient corresponding to, V 1,i Is and the filter coefficient P 1 (t) corresponding coefficients.
These 8 states are 000, 001, 010, 011, 100, 101, 110, 111, respectively. In the embodiment of the present disclosure, the 3 bits representing the state correspond to values of the i-2 th, i-1 th and i-th symbols, for example, the first bit is the i-2 th symbol, the second bit is the i-1 th symbol, and the third bit is the i-th symbol. In other embodiments, other ordering schemes are possible, such as the ith symbol for the first bit, the ith-1 symbol for the second bit, and the ith-2 symbol for the third bit.
The coefficients in 8 states are generated according to coefficient generation formulas respectively for values of i-2 th to i-th symbols in 8 states.
103: the Y is 0 The absolute value of the subtraction result of the local matched filtering result of the first matched filter in the 8 states is divided by the V 0,i Obtaining a first value, and taking Y 1 The absolute value of the subtraction result of the local matched filter results of the second matched filter in the 8 states is divided by the V 1,i Obtaining a second value, and adding the first value and the second value in the same state to obtain a real part, so as to obtain branch metric values in the 8 states, and local matched filtering in the 8 statesThe result is matched filtering results in 8 states corresponding to the SOQPSK signal transmitted in the ideal state.
Wherein, the local matched filtering result of the first matched filter in 8 states is the matched filtering result of the first matched filter of the symbols in 8 states corresponding to the SOQPSK signal transmitted in the ideal state.
The local matched filtering result of the second matched filter in 8 states is the matched filtering result of the second matched filter of the symbols in 8 states corresponding to the SOQPSK signal transmitted in an ideal state.
In this step, Y is added 0 Subtracting the local matched filtering results of the 8 first matched filters to obtain 8 results, respectively taking absolute values of the 8 results, and respectively dividing the absolute values by V in the corresponding state 0,i And 8 first values are obtained.
Will Y 1 Subtracting the local matched filtering results of the 8 second matched filters to obtain 8 results, respectively taking absolute values of the 8 results, and respectively dividing the absolute values by V in the corresponding state 1,i And 8 second values are obtained.
And then adding the first value and the second value under the same state, and taking the real part of the addition result as a branch metric value under 8 states. For example, the first value in the 000 state and the second value in the 000 state are added, and the real part of the addition result is taken as the branch metric value in 8 states.
104: and determining a first soft value component and a second soft value component according to the maximum value of the branch metric values in the 8 states.
Wherein, the first soft value component can also be regarded as the soft value component of the i-1 th symbol, and the second soft value component can also be regarded as the soft value component of the i-th symbol.
105: aligning the first soft value component and the second soft value component and then adding to obtain the soft value of the ith symbol of the SOQPSK signal.
Wherein the soft value of the ith symbol is used for subsequent demodulation of the ith symbol by an algorithm.
The first soft value component is a soft value component corresponding to 1 to i symbols, the second soft value component is a soft value component corresponding to 0 to i symbols, the part corresponding to the 0 th symbol in the sequence of the second soft value component is cut off, and then the soft value component and the sequence of the first soft value component are aligned and added to obtain a soft value capable of representing the i-th symbol of the SOQPSK signal.
In the embodiment of the disclosure, the SOQPSK signal is matched and filtered, then the absolute value is subtracted from the matched and filtered result in 8 states corresponding to the SOQPSK signal transmitted in an ideal state, and then the subtracted result is divided by a coefficient to obtain a first value and a second value, the first value and the second value in the same state are added to obtain a real part, branch metric values in 8 states are obtained, two soft value components are determined according to the 8 branch metric values, and then the two soft value components are superimposed to obtain a soft value. The scheme has small operand and small consumed resource amount, and is suitable for engineering practice. In addition, the accuracy of the soft value is increased by superposing the two soft value components, and the demodulation capacity is correspondingly improved.
Fig. 2 is a flowchart of a method for determining soft values of an SOQPSK signal according to an embodiment of the present disclosure.
Referring to fig. 2, the method includes:
201: respectively carrying out matched filtering on the received SOQPSK signal through a first matched filter and a second matched filter to obtain 2 matched filtering results Y of the ith symbol 0 And Y 1 I is greater than 2 and is a positive integer, and the filter coefficients of the first matched filter and the second matched filter are respectively P 0 (t) and P 1 (t)。
The soft value determining method for the SOQPSK signal provided by the embodiment of the present disclosure is performed by a receiving end device in a communication system.
In the embodiment of the present disclosure, when performing matched filtering on an SOQPSK signal, the length of an input signal is greater than 1 symbol, and 2 matched filtering results Y of the ith symbol are obtained 0 And Y 1 。
During matched filtering, the two matched filters are standard SOQPSK-TG modulation shaping filters respectively, and the two matched filters are generated according to the Lawrence decomposition formula of the generated phase function q (t)Coefficient P 0 (t) and P 1 (t) of (d). The formula is as follows:
P 0 (t)＝∏(uter(t+vT)2(0≤v≤L-1)，
P 1 (t)＝2(∏(uter(t+vT))(∏(uter(t+vT+t))(0≤v≤L-1)；
wherein T is time, T is a symbol period, v is a variable between 0 and L-1, L =8,L is the number of associated symbols, and the uter calculation formula is as follows:
uter＝sin(0.5q(t)/sin(0.5h*pi),(0≤t≤LT)，
uter＝sin(0.5h*pi-0.5q(t-LT)/sin(0.5h*pi),(LT≤t≤2LT)，
uter＝0otherwise，
wherein h is 1/2 and Pi is pi.
202: obtaining the P 0 (t) coefficient V in 8 states 0,i And said P 1 (t) coefficient V in 8 states 1,i The 8 states refer to 8 states consisting of the i-2 th symbol, the i-1 th symbol and the i-1 th symbol which are respectively 0 and 1.
These 8 states are 000, 001, 010, 011, 100, 101, 110, 111, respectively. In the embodiment of the present disclosure, the 3 bits representing the state correspond to values of the i-2 th, i-1 th and i-th symbols, for example, the first bit is the i-2 th symbol, the second bit is the i-1 th symbol, and the third bit is the i-th symbol. In other embodiments, other ordering schemes are possible, such as the ith symbol for the first bit, the ith-1 symbol for the second bit, and the ith-2 symbol for the third bit.
The coefficients in 8 states are generated according to coefficient generation formulas respectively for values of i-2 th to i-th symbols in 8 states.
Exemplarily, said P 0 The coefficients in 8 states corresponding to (t) are obtained according to the following formula:
V 0,i ＝0.5[(b i-1 +b i )+j(-1) i (b i-1 -b i )],
wherein, b i Is the value of the ith symbol, b i-1 The value of the (i-1) th symbol is obtained, and the value of the (i-2) th symbol is obtained when the (0) th symbol and the (1) th symbol are obtainedThe coefficients are the same.
Exemplarily, said P 1 The coefficients in 8 states corresponding to (t) are obtained according to the following formula:
V 1,i ＝sqrt(2)/8*[3b i-1 -b i-2 b i-1 b i +b i-2 +b i +j*(-1) i (3b i-1 -b i -2b i-1 b i -b i-2 -b i )]，
wherein, b i Is the value of the ith symbol, b i-1 Is the value of the (i-1) th symbol, b i-2 And j is the imaginary part symbol of the complex number.
Substituting the values (0 or 1) of 3 symbols in 8 states into the formula to obtain the P 0 (t) coefficients corresponding to 8 states and the P 1 (t) coefficients corresponding to 8 states.
203: the Y is 0 The absolute value of the subtraction result of the local matched filtering result of the first matched filter in the 8 states is divided by the V 0,i Obtaining a first value, and taking Y 1 The absolute value of the subtraction result of the local matched filtering results of the second matched filter in the 8 states is divided by the V 1,i And obtaining a second value, and adding the first value and the second value in the same state to obtain a real part, so as to obtain branch metric values in 8 states, wherein the local matched filtering result in 8 states is a matched filtering result in 8 states corresponding to the SOQPSK signal transmitted in an ideal state.
Wherein, the local matched filtering result of the first matched filter in the 8 states is obtained according to the following formula:
R 00 V 0,i +R 10 V 1,i ；
wherein R is 00 Represents the adoption of said first matched filter pair P 0 (t) the result of the matched filtering, R 10 Represents the adoption of said first matched filter pair P 1 (t) the result of performing matched filtering;
the local matched filtering result of the second matched filter in the 8 states is obtained according to the following formula:
R 01 V 0,i +R 11 V 1,i ；
wherein R is 01 Represents the adoption of said second matched filter pair P 0 (t) the result of the matched filtering, R 11 Representing the use of said second matched filter pair P 1 (t) the result of performing matched filtering.
Wherein, the multiplication in the 2 formulas is conjugate multiplication.
And substituting the coefficients in 8 states into the two formulas to obtain local matched filtering results of the first matched filter in 8 states and local matched filtering results of the second matched filter in 8 states.
204: and sequencing the branch metric values under the 8 states according to the sequence of (000, 010, 100, 110, 001, 011, 101 and 111), wherein 3 bits of each serial number respectively represent the values of the i-2 th symbol, the i-1 th symbol and the i-th symbol.
205: determining the maximum value of the branch metric values in the 8 states.
206: determining that the sign of the first soft value component is negative if the maximum value is in a first set of branch metric values, determining that the sign of the first soft value component is positive if the maximum value is in a second set of branch metric values, the first set of branch metric values corresponding to a sequence number (000, 010, 100, 110), the second set of branch metric values corresponding to a sequence number (001, 011, 101, 111).
Wherein, the first group and the second group are 2 groups divided according to the value of the ith symbol.
207: and subtracting the 1 st branch metric value and the 3 rd branch metric value of the group in which the maximum value is positioned and taking an absolute value, and subtracting the 2 nd branch metric value and the 4 th branch metric value of the group in which the maximum value is positioned and taking an absolute value.
For example, if the maximum value is in the first set of branch metric values, then 100 is subtracted from the branch metric value corresponding to state 000, the corresponding branch metric value is subtracted and the absolute value is taken, and 110 is subtracted from the branch metric value corresponding to state 010 and the absolute value is taken.
For another example, if the maximum value is in the second group of branch metric values, the branch metric value corresponding to state 001 is subtracted by the branch metric value corresponding to 101, and the absolute value is taken, and the branch metric value corresponding to state 011 is subtracted by the branch metric value corresponding to state 111, and the absolute value is taken.
208: and adding the two absolute values, and assigning a determined symbol to the addition result to obtain the first soft value component.
For example, if the maximum value is in the first set of branch metric values, the two absolute values are added to take a negative sign, and if the maximum value is in the second set of branch metric values, the two absolute values are added to take a positive sign.
209: and (2) sorting the branch metric values under the 8 states according to the sequence of (000, 001, 100, 101, 010, 011, 110 and 111), wherein 3 bits of each serial number respectively represent the values of the i-2 th symbol, the i-1 th symbol and the i-th symbol.
210: determining the maximum value of the branch metric values in the 8 states.
211: if the maximum value is located in a third set of branch metric values, determining that the sign of the second soft value component is negative, if the maximum value is located in a fourth set of branch metric values, determining that the sign of the second soft value component is positive, wherein the third set of branch metric values corresponds to a sequence number (000, 001, 100, 101), and the fourth set of branch metric values corresponds to a sequence number (010, 011, 110, 111).
Wherein, the third group and the fourth group are 2 groups divided according to the value of the i-1 th symbol.
212: and subtracting the 1 st branch metric value and the 3 rd branch metric value of the group in which the maximum value is positioned and taking an absolute value, and subtracting the 2 nd branch metric value and the 4 th branch metric value of the group in which the maximum value is positioned and taking an absolute value.
For example, if the maximum value is in the third set of branch metric values, then 100 is subtracted from the branch metric value corresponding to state 000 and the absolute value is taken, and 101 is subtracted from the branch metric value corresponding to state 001 and the absolute value is taken.
For another example, if the maximum value is in the fourth group of branch metric values, the branch metric value corresponding to state 010 is subtracted by 110 and the absolute value is taken, and the branch metric value corresponding to state 011 is subtracted by 111 and the absolute value is taken.
213: and adding the two absolute values, and assigning a determined symbol to the addition result to obtain the second soft value component.
For example, if the maximum value is in the third set of branch metric values, the two absolute values are added to take a negative sign, and if the maximum value is in the fourth set of branch metric values, the two absolute values are added to take a positive sign.
214: aligning the first soft value component and the second soft value component and then adding to obtain the soft value of the ith symbol of the SOQPSK signal.
The first soft value component is a soft value component corresponding to 1 to i symbols, the second soft value component is a soft value component corresponding to 0 to i symbols, the part corresponding to the 0 th symbol in the sequence of the second soft value component is cut off, and then the soft value component and the sequence of the first soft value component are aligned and added to obtain a soft value capable of representing the i-th symbol of the SOQPSK signal.
The soft value determining scheme of the SOQPSK signal provided by the disclosure is simple in operation, only has addition and subtraction operation, exclusive OR operation, negation operation and a small amount of multiplication, is suitable for a communication system of a Field Programmable Gate Array (FPGA) hardware platform, and is low in hardware resource occupation and cost; the two soft value components are superposed, so that the accuracy of the soft value is improved, and the demodulation capacity is correspondingly improved; the soft value can be calculated in real time, and the introduced delay is only 4 symbols of time and can be almost ignored.
Fig. 3 is a schematic structural diagram of an apparatus for determining soft values of an SOQPSK signal according to an embodiment of the present disclosure. Referring to fig. 3, the soft value determining apparatus for the SOQPSK signal includes: a matched filter module 301, an acquisition module 302, a branch metric module 303, and a soft value determination module 304.
Wherein, the matched filtering module 301 is configured to pass the received SOQPSK signals through the first matched filter respectivelyMatched filtering with the second matched filter to obtain 2 matched filtering results Y of the ith symbol 0 And Y 1 I is greater than 2 and is a positive integer, and the filter coefficients of the first matched filter and the second matched filter are respectively P 0 (t) and P 1 (t)；
An obtaining module 302 for obtaining the P 0 (t) coefficients V in 8 states 0,i And said P 1 (t) coefficient V in 8 states 1,i The 8 states refer to 8 states consisting of i-2 th symbol, i-1 th symbol and i-1 th symbol which are respectively 0 and 1;
a branch metric module 303 for dividing said Y 0 The absolute value of the subtraction result of the local matched filtering result of the first matched filter in the 8 states is divided by the V 0,i Obtaining a first value, and adding Y 1 The absolute value of the subtraction result of the local matched filtering results of the second matched filter in the 8 states is divided by the V 1,i Obtaining a second value, and adding the first value and the second value in the same state to obtain a real part, so as to obtain branch metric values in the 8 states, where the local matched filtering result in the 8 states is a matched filtering result in the 8 states corresponding to the SOQPSK signal transmitted in an ideal state;
a soft value determining module 304, configured to determine a first soft value component and a second soft value component according to a maximum value of the branch metric values in the 8 states; aligning the first soft value component and the second soft value component and then adding to obtain the soft value of the ith symbol of the SOQPSK signal.
Optionally, an obtaining module 302, configured to determine P according to the following formula 0 (t) coefficients in the corresponding 8 states:
V 0,i ＝0.5[(b i-1 +b i )+j(-1) i (b i-1 -b i )],
wherein, b i Is the value of the ith symbol, b i-1 Taking the value of the (i-1) th symbol, wherein the coefficients of the (i-2) th symbol when taking 0 and 1 are the same;
determining said P according to the following formula 1 (t) coefficients in the corresponding 8 states:
V 1,i ＝sqrt(2)/8*[3b i-1 -b i-2 b i-1 b i +b i-2 +b i +j*(-1) i (3b i-1 -b i -2b i-1 b i -b i-2 -b i )]，
wherein, b i-2 And taking the value of the (i-2) th symbol.
Optionally, the obtaining module 302 is further configured to obtain a local matched filtering result of the first matched filter in the 8 states according to the following formula:
R 00 V 0,i +R 10 V 1,i ；
wherein R is 00 Represents the adoption of said first matched filter pair P 0 (t) the result of the matched filtering, R 10 Representing the use of said first matched filter pair P 1 (t) the result of performing matched filtering;
obtaining the local matched filtering result of the second matched filter in the 8 states according to the following formula:
R 01 V 0,i +R 11 V 1,i ；
wherein R is 01 Represents the adoption of said second matched filter pair P 0 (t) the result of the matched filtering, R 11 Represents the adoption of said second matched filter pair P 1 (t) the result of performing matched filtering.
Optionally, the soft value determining module 305 is configured to:
the branch metric values under the 8 states are sequenced according to the sequence of (000, 010, 100, 110, 001, 011, 101, 111), and 3 bits of each serial number respectively represent the values of the (i-2) th symbol, the (i-1) th symbol and the (i) th symbol; determining the maximum value of the branch metric values under the 8 states; determining that the sign of the first soft value component is negative if the maximum value is in a first set of branch metric values, determining that the sign of the first soft value component is positive if the maximum value is in a second set of branch metric values, the first set of branch metric values corresponding to sequence numbers (000, 010, 100, 110), the second set of branch metric values corresponding to sequence numbers (001, 011, 101, 111); subtracting the 1 st branch metric value and the 3 rd branch metric value of the group in which the maximum value is positioned and taking an absolute value, and subtracting the 2 nd branch metric value and the 4 th branch metric value of the group in which the maximum value is positioned and taking an absolute value; adding the two absolute values, and assigning a determined symbol to the addition result to obtain the first soft value component;
sorting the branch metric values under the 8 states according to the sequence of (000, 001, 100, 101, 010, 011, 110, 111), wherein 3 bits of each serial number respectively represent the values of the i-2 th symbol, the i-1 th symbol and the i-th symbol; determining the maximum value of the branch metric values under the 8 states; if the maximum value is in a third set of branch metric values, determining that the sign of the second soft value component is negative, if the maximum value is in a fourth set of branch metric values, determining that the sign of the second soft value component is positive, wherein the third set of branch metric values corresponds to a sequence number (000, 001, 100, 101), and the fourth set of branch metric values corresponds to a sequence number (010, 011, 110, 111); subtracting the 1 st branch metric value and the 3 rd branch metric value of the group in which the maximum value is positioned and taking an absolute value, and subtracting the 2 nd branch metric value and the 4 th branch metric value of the group in which the maximum value is positioned and taking an absolute value; and adding the two absolute values, and assigning a determined symbol to the addition result to obtain the second soft value component.
It should be noted that: the soft value determining apparatus for an SOQPSK signal provided in the above embodiment, when determining a soft value of an SOQPSK signal, only illustrates the division of the above functional modules, and in practical applications, the above function distribution may be completed by different functional modules according to needs, that is, the internal structure of the device may be divided into different functional modules to complete all or part of the above described functions. In addition, the soft value determining apparatus for the SOQPSK signal and the soft value determining method embodiment of the SOQPSK signal provided in the above embodiments belong to the same concept, and the specific implementation process thereof is described in the method embodiment, and is not described herein again.
Fig. 4 is a block diagram of a communication device according to an embodiment of the present disclosure. Generally, a communication device includes: a processor 601 and a memory 602.
The processor 601 may include one or more processing cores, such as a 4-core processor, an 8-core processor, and so on. The processor 601 may be implemented in at least one hardware form of a DSP (Digital Signal Processing), an FPGA (Field-Programmable Gate Array), and a PLA (Programmable Logic Array). The processor 601 may also include a main processor and a coprocessor, where the main processor is a processor for Processing data in a wake state, and is also called a Central Processing Unit (CPU); a coprocessor is a low power processor for processing data in a standby state.
The memory 602 may include one or more computer-readable storage media, which may be non-transitory. The memory 602 may also include high-speed random access memory, as well as non-volatile memory, such as one or more magnetic disk storage devices, flash memory storage devices. In some embodiments, a non-transitory computer readable storage medium in memory 602 is used to store at least one instruction for execution by processor 601 to implement the soft value determination method for SOQPSK signals performed by a communication device as provided by the method embodiments herein.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is intended to be exemplary only and not to limit the present disclosure, and any modification, equivalent replacement, or improvement made without departing from the spirit and scope of the present disclosure is to be considered as the same as the present disclosure.

Claims (10)

1. A method for determining soft values of an SOQPSK signal, the method comprising:
respectively carrying out matched filtering on the received SOQPSK signal through a first matched filter and a second matched filter to obtain 2 matched filtering results Y of the ith symbol 0 And Y 1 I is greater than 2 and is a positive integer, and the filter coefficients of the first matched filter and the second matched filter are respectively P 0 (t) and P 1 (t)；
Obtaining the P 0 (t) coefficient V in 8 states 0,i And said P 1 (t) coefficient V in 8 states 1,i The 8 states refer to 8 states formed by the i-2 th symbol, the i-1 th symbol and the i-1 th symbol which are respectively 0 and 1;
the Y is 0 The absolute value of the subtraction result of the local matched filtering result of the first matched filter in the 8 states is divided by the V 0,i Obtaining a first value, and adding Y 1 The absolute value of the subtraction result of the local matched filtering results of the second matched filter in the 8 states is divided by the V 1,i Obtaining a second value, and adding the first value and the second value in the same state to obtain a real part, so as to obtain branch metric values in 8 states, where the local matched filtering result in 8 states is a matched filtering result in 8 states corresponding to the SOQPSK signal transmitted in an ideal state;
determining a first soft value component and a second soft value component according to the maximum value of the branch metric values under the 8 states;
aligning the first soft value component and the second soft value component and then adding to obtain the soft value of the ith symbol of the SOQPSK signal.
2. The method of claim 1, wherein P is P 0 The coefficients in the 8 states corresponding to (t) are obtained according to the following formula:
V 0,i ＝0.5[(b i-1 +b i )+j(-1) i (b i-1 -b i )],
wherein, b i Is that it isValue of the ith symbol, b i-1 The value of the (i-1) th symbol is taken, and the coefficients when the (i-2) th symbol takes 0 and 1 are the same;
the P is 1 The coefficients in 8 states corresponding to (t) are obtained according to the following formula:
V 1,i ＝sqrt(2)/8*[3b i-1 -b i-2 b i-1 b i +b i-2 +b i +j*(-1) i (3b i-1 -b i -2b i-1 b i -b i-2 -b i )]，
wherein, b i-2 And taking the value of the (i-2) th symbol.
3. The method of claim 1, wherein the local matched filter result of the first matched filter in the 8 states is obtained according to the following formula:
R 00 V 0,i +R 10 V 1,i ；
wherein R is 00 Representing the use of said first matched filter pair P 0 (t) the result of the matched filtering, R 10 Representing the use of said first matched filter pair P 1 (t) the result of performing matched filtering;
the local matched filtering result of the second matched filter in the 8 states is obtained according to the following formula:
R 01 V 0,i +R 11 V 1,i ；
wherein R is 01 Representing the use of said second matched filter pair P 0 (t) the result of the matched filtering, R 11 Representing the use of said second matched filter pair P 1 (t) the result of performing matched filtering.
4. The method according to any of claims 1 to 3, wherein determining the first soft value component based on the maximum of the branch metric values for the 8 states comprises:
sorting the branch metric values under the 8 states according to the sequence of (000, 010, 100, 110, 001, 011, 101, 111), wherein 3 bits of each serial number respectively represent the values of the i-2 th symbol, the i-1 th symbol and the i-th symbol;
determining the maximum value of the branch metric values in the 8 states;
determining that the sign of the first soft value component is negative if the maximum value is in a first set of branch metric values, determining that the sign of the first soft value component is positive if the maximum value is in a second set of branch metric values, the first set of branch metric values corresponding to sequence numbers (000, 010, 100, 110), the second set of branch metric values corresponding to sequence numbers (001, 011, 101, 111);
subtracting the 1 st branch metric value and the 3 rd branch metric value of the group where the maximum value is located and taking an absolute value, and subtracting the 2 nd branch metric value and the 4 th branch metric value of the group where the maximum value is located and taking an absolute value;
and adding the two absolute values, and assigning a determined symbol to the addition result to obtain the first soft value component.
5. The method according to any of claims 1 to 3, wherein determining a second soft value component according to the maximum value of the branch metric values in the 8 states comprises:
sorting the branch metric values under the 8 states according to the sequence of (000, 001, 100, 101, 010, 011, 110, 111), wherein 3 bits of each serial number respectively represent the values of the i-2 th symbol, the i-1 th symbol and the i-th symbol;
determining the maximum value of the branch metric values in the 8 states;
if the maximum value is in a third set of branch metric values, determining that the sign of the second soft value component is negative, if the maximum value is in a fourth set of branch metric values, determining that the sign of the second soft value component is positive, wherein the third set of branch metric values corresponds to a sequence number (000, 001, 100, 101), and the fourth set of branch metric values corresponds to a sequence number (010, 011, 110, 111);
subtracting the 1 st branch metric value and the 3 rd branch metric value of the group in which the maximum value is positioned and taking an absolute value, and subtracting the 2 nd branch metric value and the 4 th branch metric value of the group in which the maximum value is positioned and taking an absolute value;
and adding the two absolute values, and assigning a determined symbol to the addition result to obtain the second soft value component.
6. An apparatus for determining soft values of an SOQPSK signal, the apparatus comprising:
a matched filtering module for matched filtering the received SOQPSK signal by a first matched filter and a second matched filter to obtain 2 matched filtering results Y of the ith symbol 0 And Y 1 I is greater than 2 and is a positive integer, and the filter coefficients of the first matched filter and the second matched filter are respectively P 0 (t) and P 1 (t)；
An acquisition module for acquiring the P 0 (t) coefficient V in 8 states 0,i And said P 1 (t) coefficients V in 8 states 1,i The 8 states refer to 8 states formed by the i-2 th symbol, the i-1 th symbol and the i-1 th symbol which are respectively 0 and 1;
a branch metric module for dividing Y into two values 0 The absolute value of the subtraction result of the local matched filtering result of the first matched filter in the 8 states is divided by the V 0,i Obtaining a first value, and taking Y 1 The absolute value of the subtraction result of the local matched filtering results of the second matched filter in the 8 states is divided by the V 1,i Obtaining a second value, and adding the first value and the second value in the same state to obtain a real part, so as to obtain branch metric values in 8 states, where the local matched filtering result in 8 states is a matched filtering result in 8 states corresponding to the SOQPSK signal transmitted in an ideal state;
a soft value determining module, configured to determine a first soft value component and a second soft value component according to a maximum value of the branch metric values in the 8 states; aligning the first soft value component and the second soft value component and then adding to obtain the soft value of the ith symbol of the SOQPSK signal.
7. The apparatus of claim 6, wherein the obtaining module is configured to determine P according to the following formula 0 (t) coefficients in the corresponding 8 states:
V 0,i ＝0.5[(b i-1 +b i )+j(-1) i (b i-1 -b i )],
wherein, b i Is the value of the ith symbol, b i-1 The value of the (i-1) th symbol is taken, and the coefficients when the (i-2) th symbol takes 0 and 1 are the same;
determining said P according to the following formula 1 (t) coefficients in the corresponding 8 states:
V 1,i ＝sqrt(2)/8*[3b i-1 -b i-2 b i-1 b i +b i-2 +b i +j*(-1) i (3b i-1 -b i -2b i-1 b i -b i-2 -b i )]，
wherein, b i-2 And taking the value of the (i-2) th symbol.
8. The apparatus of claim 6 or 7, wherein the soft value determining module is configured to:
sorting the branch metric values under the 8 states according to the sequence of (000, 010, 100, 110, 001, 011, 101, 111), wherein 3 bits of each serial number respectively represent the values of the i-2 th symbol, the i-1 th symbol and the i-th symbol; determining the maximum value of the branch metric values in the 8 states; determining that the sign of the first soft value component is negative if the maximum value is in a first set of branch metric values, determining that the sign of the first soft value component is positive if the maximum value is in a second set of branch metric values, the first set of branch metric values corresponding to sequence numbers (000, 010, 100, 110), the second set of branch metric values corresponding to sequence numbers (001, 011, 101, 111); subtracting the 1 st branch metric value and the 3 rd branch metric value of the group in which the maximum value is positioned and taking an absolute value, and subtracting the 2 nd branch metric value and the 4 th branch metric value of the group in which the maximum value is positioned and taking an absolute value; adding the two absolute values, and assigning a determined symbol to the addition result to obtain the first soft value component;
sorting the branch metric values under the 8 states according to the sequence of (000, 001, 100, 101, 010, 011, 110, 111), wherein 3 bits of each serial number respectively represent the values of the i-2 th symbol, the i-1 th symbol and the i-th symbol; determining the maximum value of the branch metric values in the 8 states; if the maximum value is in a third set of branch metric values, determining that the sign of the second soft value component is negative, if the maximum value is in a fourth set of branch metric values, determining that the sign of the second soft value component is positive, wherein the third set of branch metric values corresponds to a sequence number (000, 001, 100, 101), and the fourth set of branch metric values corresponds to a sequence number (010, 011, 110, 111); subtracting the 1 st branch metric value and the 3 rd branch metric value of the group in which the maximum value is positioned and taking an absolute value, and subtracting the 2 nd branch metric value and the 4 th branch metric value of the group in which the maximum value is positioned and taking an absolute value; and adding the two absolute values, and assigning a determined symbol to the addition result to obtain the second soft value component.
9. A communication device, characterized in that the communication device comprises a processor and a memory, the memory storing at least one program code, the program code being loaded and executed by the processor to implement the method for soft value determination of SOQPSK signals according to any of claims 1 to 5.
10. A computer-readable storage medium having stored therein at least one program code, the program code being loaded into and executed by a processor to implement the method for soft value determination of SOQPSK signal according to any of claims 1 to 5.
CN202211524555.7A 2022-11-30 2022-11-30 Soft value determination method and device of SOQPSK (Soft offset Quadrature phase Shift keying) signal and communication equipment Pending CN115987733A (en)

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