CN107294895B - Filter optimization method, filter configuration method, related equipment and system - Google Patents

Filter optimization method, filter configuration method, related equipment and system Download PDF

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CN107294895B
CN107294895B CN201610201208.9A CN201610201208A CN107294895B CN 107294895 B CN107294895 B CN 107294895B CN 201610201208 A CN201610201208 A CN 201610201208A CN 107294895 B CN107294895 B CN 107294895B
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pulse
base station
filter
terminal equipment
filter coefficient
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CN107294895A (en
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赵兆
王奇
龙毅
郭志恒
程型清
龚希陶
麦塔·舒尔曼
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
    • H04L27/2691—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation involving interference determination or cancellation

Abstract

The embodiment of the invention discloses a filter optimization method, a filter configuration method,Related apparatus and systems. The filter optimization method comprises the following steps: determining the coefficient of a transmitting filter meeting the leakage ratio requirement of a target adjacent channel according to the leakage ratio requirement of the target adjacent channel
Figure DDA0000956051840000011
According to a given channel statistical characteristic H and a requirement for satisfying the target adjacent channel leakage ratio
Figure DDA0000956051840000012
Analyzing the SINR of the receiving endRXMaximum preferred receive filter coefficient
Figure DDA0000956051840000013
Approximating the preferred receive filter coefficients using a known window function
Figure DDA0000956051840000014
Obtaining the preferred receive filter coefficients
Figure DDA0000956051840000015
Approximate receive filter coefficients
Figure DDA0000956051840000016
The receiving filter coefficient
Figure DDA0000956051840000017
For configuring the receive-side filter. The scheme can improve the signal-to-interference-and-noise ratio and improve the communication performance.

Description

Filter optimization method, filter configuration method, related equipment and system
Technical Field
The present invention relates to the field of communications, and in particular, to a filter optimization method, a filter configuration method, a related device, and a system.
Background
An Orthogonal Frequency Division Multiplexing (OFDM) system is a communication system which is most widely used in recent years, for example, a Long Term Evolution (LTE) system.
Compared with the LTE communication system, the next generation communication system not only needs to obtain an improvement in performance, but also needs to support a new service type through a new air interface design. That is, on the basis of the conventional Mobile BroadBand (MBB) service, Machine-To-Machine Communication (M2M), Man-Machine Communication (M-computer-Communication, M-C), and other abundant and diverse new services, such as high-reliable and Low-Latency Communication (mtc) and Mass Machine Type Communication (MMTC), need To be supported. The new air interface technology comprises technologies with multiple dimensions such as coding, waveform, multiple access, frame structure and the like, wherein the waveform technology is a key link for realizing flexible support of multiple services and is very important for a new air interface of a 5G system.
Because an Orthogonal Frequency Division Multiplexing (OFDM) technology based on Cyclic Prefix (CP), namely CP-OFDM, has the characteristics of good multipath interference resistance, good compatibility with various MIMO technologies, and the like, the conventional OFDM system generally adopts CP-OFDM as a specific scheme of a multi-carrier waveform. However, the CP-OFDM system fixedly adopts a rectangular window for windowing, which has obvious defects in suppressing the Adjacent Channel Leakage Ratio (ACLR) and Out-Of-Band power Leakage (OOBE), and a certain guard Band needs to be reserved to suppress the interference between Adjacent time-frequency resource blocks caused by different services or Channel shapes.
Disclosure of Invention
The embodiment of the invention provides a filter optimization method, a filter configuration method, related equipment and a system, which can improve the signal-to-interference-and-noise ratio and the communication performance and are used for supporting different communication scenes.
The embodiment of the invention provides a filter optimization method, a filter configuration method, related equipment and a system, which can improve the signal-to-interference-and-noise ratio and the communication performance and are used for supporting different communication scenes.
In a first aspect, an embodiment of the present invention provides a filter optimization method, where the method includes:
determining the coefficient of the transmitting filter meeting the leakage ratio requirement of the target adjacent channel according to the leakage ratio requirement of the target adjacent channel
Figure BDA0000956051820000021
According to channel statistical characteristics H and meeting the target adjacent channel leakage ratio requirement
Figure BDA0000956051820000022
Calculating the SINR of the receiving endRXMaximum preferred receive filter coefficient
Figure BDA0000956051820000023
Wherein, the channel statistical characteristics, the transmission filter coefficient gTX(t), and reception filter coefficient γRX(t) determining the SINR of the receiving endRXA variable of (d);
approximating the preferred receive filter coefficients using a known window function
Figure BDA0000956051820000024
Obtaining the preferred receive filter coefficients
Figure BDA0000956051820000025
Approximate receive filter coefficients
Figure BDA0000956051820000026
The above-mentioned
Figure BDA0000956051820000027
For configuring the receive-side filter.
With reference to the first aspect, in a first possible implementation manner of the first aspect, the channel statistics is based on a channel statistics H and a requirement that the target adjacent channel leakage ratio is met
Figure BDA0000956051820000028
Calculating the SINR of the receiving endRXMaximum preferred receive filter coefficient
Figure BDA0000956051820000029
The method comprises the following steps:
the SINR of the receiving end is obtained by the following algorithmRXMaximum preferred receive filter coefficient
Figure BDA00009560518200000210
Figure BDA00009560518200000211
Wherein, gTX(t) is equal to
Figure BDA00009560518200000212
With reference to the first aspect or the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the method further includes:
according to said channel statistical property H and said
Figure BDA00009560518200000213
Calculating the SINR of the sending endTXMaximum preferred transmit filter coefficient
Figure BDA00009560518200000214
Wherein the channel statistical characteristics, the transmit filter coefficients gTX(t), and the reception filter coefficient γRX(t) determining the SINR of the transmitting endTXA variable of (d);
approximating the preferred transmit filter coefficients using a known window function
Figure BDA00009560518200000215
Obtaining the optimal transmit filter coefficients
Figure BDA00009560518200000216
Approximate transmit filter
Figure BDA00009560518200000217
The above-mentioned
Figure BDA00009560518200000218
For configuring the transmit-side filter.
With reference to the second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the channel statistics according to the channel statistics characteristic H and the channel statistics characteristic H are obtained
Figure BDA0000956051820000031
Calculating the SINR of the sending endTXMaximum preferred transmit filter coefficient
Figure BDA0000956051820000032
The method comprises the following steps:
the SINR of the sending end is obtained by the following algorithmTXMaximum preferred transmit filter coefficient
Figure BDA0000956051820000033
Figure BDA0000956051820000034
Wherein, γRX(t) is equal to
Figure BDA0000956051820000035
With reference to the first aspect, or the first possible implementation manner of the first aspect, or the second possible implementation manner of the first aspect, or the third possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, in the obtaining and the obtaining of the preferred receive filter coefficient
Figure BDA0000956051820000036
Approximate receive filter coefficientsThen, the method further comprises the following steps:
progressive optimization of the transmit filter coefficients g by an iterative optimization processTX(t) and reception filter coefficient γRX(t); wherein:
in round i +1, the preferred receive filter coefficients are calculated by the following algorithm
Figure BDA0000956051820000038
Figure BDA0000956051820000039
Wherein, gTX(t) is equal to
Figure BDA00009560518200000320
Is the transmit filter coefficient obtained and preferred in the ith round
Figure BDA00009560518200000312
The approximate transmit filter coefficients of the transmit filter coefficients,
Figure BDA00009560518200000313
is calculated in the ith round to ensure that the signal to interference plus noise ratio (SINR) of a transmitting endTXA maximum preferred transmit filter coefficient;
alternatively, in round i +1, the preferred transmit filter coefficients are calculated by the following algorithm
Figure BDA00009560518200000314
Figure BDA00009560518200000315
Wherein, γRX(t) is equal to
Figure BDA00009560518200000321
Is the reception filter coefficient obtained and preferred in the ith round
Figure BDA00009560518200000318
The approximate coefficients of the receive filter are,
Figure BDA00009560518200000319
is obtained by calculation in the ith round to ensure that the signal to interference plus noise ratio (SINR) of a receiving endRXA maximum preferred receive filter coefficient;
wherein i is a positive integer.
With reference to the first aspect, or the first possible implementation manner of the first aspect, or the second possible implementation manner of the first aspect, or the third possible implementation manner of the first aspect, or the fourth possible implementation manner of the first aspect, in a fifth possible implementation manner of the first aspect, the receiving filter coefficient g is obtained by using a filter coefficient g obtained by filtering the received signalTX(t) the transmission filter coefficient γRX(t) are each characterized by a predefined pulse parameter;
the pulse parameters include: presetting all or part of a parameter set; the preset parameter set comprises: first FlagheadSecond FlagtailA first value N1A second value N2Pulse shape PtypeAnd the length K of the pulse to be configured relative to a single symbol period. Wherein the first Flag bit FlagheadIs used for indicating whether the head part of the symbol is subjected to pulse forming or not, and the second Flag bit FlagtailIs used for indicating whether the tail part of the symbol is subjected to pulse forming or not, and the first numerical value N1The number of sampling points used for indicating pulse shaping in a single symbol and with amplitude weight not equal to 1, and the second value N2For indicating out-of-symbol pulsingThe number of sampling points of the model; the pulse shape PtypeFor indicating the shape of the pulse to be configured.
In a second aspect, an embodiment of the present invention provides a filter configuration method, which is applied to a base station side, and includes:
if the current communication scene belongs to a preset communication scene needing pulse forming processing, the base station determines a pulse to be configured aiming at the current communication scene; the pulse to be configured is characterized by a set of pulse parameters;
receiving configuration information sent by terminal equipment, wherein the configuration information is used for indicating pulse shapes supported by the terminal equipment;
if the configuration information indicates that the terminal equipment supports the pulse to be configured and the pulse forming processing needs to be carried out on the terminal equipment side, notifying the terminal equipment of the pulse parameter of the pulse to be configured; the pulse parameters are used for configuring filter coefficients of the terminal equipment.
With reference to the second aspect, in a first possible implementation manner of the second aspect, the pulse shaping processing that needs to be performed on the terminal device side includes:
in the uplink transmission process, pulse modulation needs to be carried out at a sending end; or, in the downlink transmission process, pulse modulation needs to be performed at the receiving end;
the pulse parameters are used for configuring filter coefficients of the terminal equipment, and comprise:
in the uplink transmission process, the pulse parameters of the pulse to be configured are used for configuring a sending filter of the terminal equipment; or, in the downlink transmission process, the pulse parameter of the pulse to be configured is used for configuring a receiving filter of the terminal device.
With reference to the second aspect, or the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, the method further includes: if the pulse forming processing is judged to be needed on the base station side, configuring a filter coefficient of the base station side according to the pulse parameter of the pulse to be configured; the pulse parameters are used to configure filter coefficients of the base station.
With reference to the second possible implementation manner of the second aspect, in a third possible implementation manner of the second aspect, the pulse shaping processing that needs to be performed at the base station side includes:
in the uplink transmission process, pulse modulation needs to be carried out at a receiving end; or, in the downlink transmission process, pulse modulation needs to be performed at the sending end;
the pulse parameters are used for configuring filter coefficients of the base station, and comprise:
in the uplink transmission process, the pulse parameters of the pulse to be configured are used for configuring the receiving filter coefficient of the base station; or, in the downlink transmission process, the pulse parameter of the pulse to be configured is used for configuring the sending filter coefficient of the base station.
With reference to the first possible implementation manner of the second aspect or the third possible implementation manner of the second aspect, in a fourth possible implementation manner of the second aspect, the determining that pulse modulation needs to be performed at the transmitting end includes:
and judging whether pulse modulation needs to be carried out at a sending end according to at least one item of the service type of the transmission service, the preset requirement of the communication scene and the overhead of a guard band.
With reference to the first possible implementation manner of the second aspect or the third possible implementation manner of the second aspect, in a fifth possible implementation manner of the second aspect, the determining that pulse modulation needs to be performed at the receiving end includes:
and judging whether the pulse modulation is needed at the receiving end according to at least one of the demodulation performance of the receiving end and the encoding and modulation orders of the signals.
With reference to the second aspect, or the first possible implementation manner of the second aspect, or the second possible implementation manner of the second aspect, or the third possible implementation manner of the second aspect, or the fourth possible implementation manner of the second aspect, or the fifth possible implementation manner of the second aspect, in a sixth possible implementation manner of the second aspect, the notifying the terminal device of the pulse parameter of the pulse to be configured includes:
notifying the pulse parameters to the terminal equipment by using dynamic signaling with a fixed period; alternatively, the first and second electrodes may be,
and informing the pulse parameters to the terminal equipment by utilizing real-time dynamic signaling.
With reference to the sixth possible implementation manner of the second aspect, in a seventh possible implementation manner of the second aspect, the signaling carries a pulse parameter of the pulse to be configured; or, the signaling carries the indication information of the pulse to be configured.
With reference to the second aspect, or the first possible implementation manner of the second aspect, or the second possible implementation manner of the second aspect, or the third possible implementation manner of the second aspect, or the fourth possible implementation manner of the second aspect, or the fifth possible implementation manner of the second aspect, or the sixth possible implementation manner of the second aspect, or the seventh possible implementation manner of the second aspect, in an eighth possible implementation manner of the second aspect, the preset communication scenario that needs to be subjected to the pulse shaping processing includes at least one of the following:
the current communication scene belongs to a preset scene needing to limit out-of-band power leakage, the terminal equipment is scheduled at the edge of a resource where different OFDM setting parameters coexist, the terminal equipment adopts a high-order modulation or high-order modulation coding strategy, the time-frequency fading currently corresponding to the terminal equipment reaches a preset degree, the resource position corresponding to the terminal equipment is positioned at the frame head and/or the frame tail of a data frame, and the physical channel currently positioned by the terminal equipment is a preset physical channel needing pulse forming; the OFDM setting parameters comprise cyclic prefix length and subcarrier width.
With reference to the second aspect, or the first possible implementation manner of the second aspect, or the second possible implementation manner of the second aspect, or the third possible implementation manner of the second aspect, or the fourth possible implementation manner of the second aspect, or the fifth possible implementation manner of the second aspectIn a ninth possible implementation manner of the second aspect, or the sixth possible implementation manner of the second aspect, or the seventh possible implementation manner of the second aspect, the pulse parameter includes: presetting all or part of a parameter set; the preset parameter set comprises: first FlagheadSecond FlagtailA first value N1A second value N2Pulse shape PtypeAnd the length K of the pulse to be configured relative to a single symbol period. Wherein the first Flag bit FlagheadIs used for indicating whether the head part of the symbol is subjected to pulse forming or not, and the second Flag bit FlagtailIs used for indicating whether the tail part of the symbol is subjected to pulse forming or not, and the first numerical value N1The number of sampling points used for indicating pulse shaping in a single symbol and with amplitude weight not equal to 1, and the second value N2The number of sampling points for indicating pulse shaping outside a single symbol, the pulse shape PtypeFor indicating the shape of the pulse to be configured.
In a third aspect, an embodiment of the present invention provides a filter configuration method, where the method is applied to a terminal device side, and includes:
sending configuration information to a base station, wherein the configuration information is used for indicating the pulse shape supported by the terminal equipment;
receiving the pulse parameters of the pulse to be configured, which are notified by the base station;
and configuring the filter coefficient according to the pulse parameter of the pulse to be configured.
With reference to the third aspect, in a first possible implementation manner of the third aspect, the receiving the pulse parameter of the pulse to be configured, which is notified by the base station, includes:
receiving a dynamic signaling with a fixed period sent by a base station, wherein the dynamic signaling with the fixed period is used for notifying a pulse parameter of the pulse to be configured; alternatively, the first and second electrodes may be,
and receiving a real-time dynamic signaling sent by a base station, wherein the real-time dynamic signaling is used for informing the pulse parameters of the pulse to be configured.
With reference to the first possible implementation manner of the third aspect, in a second possible implementation manner of the third aspect, the signaling carries a pulse parameter of the pulse to be configured; or, the signaling carries the indication information of the pulse to be configured.
With reference to the third aspect, or the first possible implementation manner of the third aspect, or the second possible implementation manner of the third aspect, in a third possible implementation manner of the third aspect, the pulse shape supported by the terminal device is used to indicate whether the terminal device supports the pulse to be configured corresponding to the current communication scenario; the current communication scene belongs to a preset communication scene needing pulse forming processing.
With reference to the third aspect, or the first possible implementation manner of the third aspect, or the second possible implementation manner of the third aspect, or the third possible implementation manner of the third aspect, in a fourth possible implementation manner of the third aspect, the preset communication scenario that needs to be subjected to pulse shaping processing includes at least one of the following:
the current communication scene belongs to a preset scene needing to limit out-of-band power leakage, the terminal equipment is scheduled at the edge of a resource where different OFDM setting parameters coexist, the terminal equipment adopts a high-order modulation or high-order modulation coding strategy, the time-frequency fading currently corresponding to the terminal equipment reaches a preset degree, the resource position corresponding to the terminal equipment is positioned at the frame head and/or the frame tail of a data frame, and the physical channel currently positioned by the terminal equipment is a preset physical channel needing pulse forming; the OFDM setting parameters comprise cyclic prefix length and subcarrier width.
In a fourth aspect, an embodiment of the present invention provides a communication network device, where the network device includes:
a determining unit for determining the coefficient of the transmitting filter meeting the target adjacent channel leakage ratio requirement according to the target adjacent channel leakage ratio requirement
Figure BDA0000956051820000071
A first calculation unit for calculating a target adjacent channel leakage ratio according to the channel statistical characteristic HCalculating the SINR of the receiving endRXMaximum preferred receive filter coefficient
Figure BDA0000956051820000073
Wherein, the channel statistical characteristics, the transmission filter coefficient gTX(t), and reception filter coefficient γRX(t) determining the SINR of the receiving endRXA variable of (d);
a first approximation unit for approximating the preferred receive filter coefficients using a known window function
Figure BDA0000956051820000074
Obtaining the preferred receive filter coefficients
Figure BDA0000956051820000081
Approximate receive filter coefficients
Figure BDA0000956051820000082
The above-mentioned
Figure BDA0000956051820000083
For configuring the receive-side filter.
With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, the first computing unit is specifically configured to:
the SINR of the receiving end is obtained by the following algorithmRXMaximum preferred receive filter coefficient
Figure BDA0000956051820000084
Figure BDA0000956051820000085
Wherein, gTX(t) is equal to
Figure BDA0000956051820000086
With reference to the fourth aspect, or the first possible implementation manner of the fourth aspect, in a second possible implementation manner of the fourth aspect, the method further includes:
a second calculation unit for calculating a channel statistic H based on the channel statistic and the channel statistic
Figure BDA0000956051820000087
Calculating the SINR of the sending endTXMaximum preferred transmit filter coefficient
Figure BDA0000956051820000088
Wherein the channel statistical characteristics, the transmission filter coefficients gTX(t), and the reception filter coefficient γRX(t) determining the SINR of the transmitting endTXA variable of (d);
a second approximation unit for approximating the preferred transmit filter coefficients using a known window function
Figure BDA0000956051820000089
Obtaining the optimal transmit filter coefficients
Figure BDA00009560518200000810
Approximate transmit filter
Figure BDA00009560518200000811
The above-mentioned
Figure BDA00009560518200000812
For configuring the transmit-side filter.
With reference to the second possible implementation manner of the fourth aspect, in a third possible implementation manner of the fourth aspect, the second calculating unit is specifically configured to:
the SINR of the sending end is obtained by the following algorithmTXMaximum preferred transmit filter coefficient
Figure BDA00009560518200000813
Figure BDA00009560518200000814
Wherein, γRX(t) is equal to
Figure BDA00009560518200000815
With reference to the fourth aspect, or the first possible implementation manner of the fourth aspect, or the second possible implementation manner of the fourth aspect, or the third possible implementation manner of the fourth aspect, in a fourth possible implementation manner of the fourth aspect, the method further includes: an iterative optimization unit to: progressive optimization of the transmit filter coefficients g by an iterative optimization processTX(t) and reception filter coefficient γRX(t); wherein:
in round i +1, the preferred receive filter coefficients are calculated by the following algorithm
Figure BDA00009560518200000816
Figure BDA00009560518200000817
Wherein, gTX(t) is equal to
Figure BDA00009560518200000818
Is the transmit filter coefficient obtained and preferred in the ith round
Figure BDA0000956051820000091
The approximate transmit filter coefficients of the transmit filter coefficients,
Figure BDA0000956051820000092
is calculated in the ith round to ensure that the signal to interference plus noise ratio (SINR) of a transmitting endTXA maximum preferred transmit filter coefficient;
or, at round i +1In (1), a preferred transmission filter coefficient is calculated by the following algorithm
Figure BDA0000956051820000093
Figure BDA0000956051820000094
Wherein, γRX(t) is equal to
Figure BDA0000956051820000099
Is the reception filter coefficient obtained and preferred in the ith round
Figure BDA0000956051820000097
The approximate coefficients of the receive filter are,
Figure BDA0000956051820000098
is obtained by calculation in the ith round to ensure that the signal to interference plus noise ratio (SINR) of a receiving endRXA maximum preferred receive filter coefficient;
wherein i is a positive integer.
With reference to the fourth aspect, or the first possible implementation manner of the fourth aspect, or the second possible implementation manner of the fourth aspect, or the third possible implementation manner of the fourth aspect, or the fourth possible implementation manner of the fourth aspect, in a fifth possible implementation manner of the fourth aspect, the receive filter coefficient g is a coefficient of a filterTX(t) the transmission filter coefficient γRX(t) are each characterized by a predefined pulse parameter;
the pulse parameters include: presetting all or part of a parameter set; the preset parameter set comprises: first FlagheadSecond FlagtailA first value N1A second value N2Pulse shape PtypeAnd the length K of the pulse to be configured relative to a single symbol period. Wherein the first Flag bit FlagheadIs used for indicating whether the head part of the symbol is subjected to pulse forming or not, and the second Flag bit FlagtailIs used for indicating whether the tail part of the symbol is subjected to pulse forming or not, and the first numerical value N1The number of sampling points used for indicating pulse shaping in a single symbol and with amplitude weight not equal to 1, and the second value N2The number of sampling points used for indicating pulse forming outside a single symbol; the pulse shape PtypeFor indicating the shape of the pulse to be configured.
In a fifth aspect, an embodiment of the present invention provides a base station, where the base station includes:
the base station is used for determining a pulse to be configured aiming at the current communication scene if the current communication scene belongs to a preset communication scene needing pulse forming processing; the pulse to be configured is characterized by a set of pulse parameters;
the receiving unit is used for receiving configuration information sent by terminal equipment, and the configuration information is used for indicating the pulse shapes supported by the terminal equipment;
the judging unit is used for judging whether the terminal equipment supports the pulse to be configured or not according to the configuration information and judging whether pulse forming processing needs to be carried out on the terminal equipment side or not;
a notifying unit, configured to notify a pulse parameter of the pulse to be configured to the terminal device if the configuration information indicates that the terminal device supports the pulse to be configured and it is determined that pulse shaping processing needs to be performed on the terminal device side; the pulse parameters are used for configuring filter coefficients of the terminal equipment.
With reference to the fifth aspect, in a first possible implementation manner of the fifth aspect, the pulse shaping processing that needs to be performed on the terminal device side includes:
in the uplink transmission process, pulse modulation needs to be carried out at a sending end; or, in the downlink transmission process, pulse modulation needs to be performed at the receiving end;
the pulse parameters are used for configuring filter coefficients of the terminal equipment, and comprise:
in the uplink transmission process, the pulse parameters of the pulse to be configured are used for configuring a sending filter of the terminal equipment; or, in the downlink transmission process, the pulse parameter of the pulse to be configured is used for configuring a receiving filter of the terminal device.
With reference to the fifth aspect, or the first possible implementation manner of the fifth aspect, in a second possible implementation manner of the fifth aspect, the method further includes: the configuration unit is used for configuring the filter coefficient of the base station side according to the pulse parameter of the pulse to be configured if the pulse forming processing needs to be carried out on the base station side; the pulse parameters are used to configure filter coefficients of the base station.
With reference to the second possible implementation manner of the fifth aspect, in three possible implementation manners of the fifth aspect, the pulse shaping processing that needs to be performed on the base station side includes:
in the uplink transmission process, pulse modulation needs to be carried out at a receiving end; or, in the downlink transmission process, pulse modulation needs to be performed at the sending end;
the pulse parameters are used for configuring filter coefficients of the base station, and comprise:
in the uplink transmission process, the pulse parameters of the pulse to be configured are used for configuring the receiving filter coefficient of the base station; or, in the downlink transmission process, the pulse parameter of the pulse to be configured is used for configuring the sending filter coefficient of the base station.
With reference to the first possible implementation manner of the fifth aspect or the third possible implementation manner of the fifth aspect, in four possible implementation manners of the fifth aspect, the determining module is specifically configured to: and judging whether pulse modulation needs to be carried out at a sending end according to at least one item of the service type of the transmission service, the preset requirement of the communication scene and the overhead of a guard band.
With reference to the first possible implementation manner of the fifth aspect or the third possible implementation manner of the fifth aspect, in five possible implementation manners of the fifth aspect, the determining module is specifically configured to: and judging whether the pulse modulation is needed at the receiving end according to at least one of the demodulation performance of the receiving end and the encoding and modulation orders of the signals.
With reference to the fifth aspect, or the first possible implementation manner of the fifth aspect, or the second possible implementation manner of the fifth aspect, or the third possible implementation manner of the fifth aspect, or the fourth possible implementation manner of the fifth aspect, or the fifth possible implementation manner of the fifth aspect, in six possible implementation manners of the fifth aspect, the notification unit is specifically configured to:
notifying the pulse parameters to the terminal equipment by using dynamic signaling with a fixed period; alternatively, the first and second electrodes may be,
and informing the pulse parameters to the terminal equipment by utilizing real-time dynamic signaling.
With reference to the sixth possible implementation manner of the fifth aspect, in a seventh possible implementation manner of the fifth aspect, the signaling carries a pulse parameter of the pulse to be configured; or, the signaling carries the indication information of the pulse to be configured.
With reference to the fifth aspect, or the first possible implementation manner of the fifth aspect, or the second possible implementation manner of the fifth aspect, or the third possible implementation manner of the fifth aspect, or the fourth possible implementation manner of the fifth aspect, or the fifth possible implementation manner of the fifth aspect, or the sixth possible implementation manner of the fifth aspect, or the seventh possible implementation manner of the fifth aspect, in the eight possible implementation manners of the fifth aspect, the preset communication scenario that needs to be subjected to the pulse shaping processing includes at least one of the following:
the current communication scene belongs to a preset scene needing to limit out-of-band power leakage, the terminal equipment is scheduled at the edge of a resource where different OFDM setting parameters coexist, the terminal equipment adopts a high-order modulation or high-order modulation coding strategy, the time-frequency fading currently corresponding to the terminal equipment reaches a preset degree, the resource position corresponding to the terminal equipment is positioned at the frame head and/or the frame tail of a data frame, and the physical channel currently positioned by the terminal equipment is a preset physical channel needing pulse forming; the OFDM setting parameters comprise cyclic prefix length and subcarrier width.
With reference to the fifth aspect, or the first aspect of the fifth aspectIn an implementation manner, or the second possible implementation manner of the fifth aspect, or the third possible implementation manner of the fifth aspect, or the fourth possible implementation manner of the fifth aspect, or the fifth possible implementation manner of the fifth aspect, or the sixth possible implementation manner of the fifth aspect, or the seventh possible implementation manner of the fifth aspect, or the eighth possible implementation manner of the fifth aspect, in nine possible implementation manners of the fifth aspect, the pulse parameter includes: presetting all or part of a parameter set; the preset parameter set comprises: first FlagheadSecond FlagtailA first value N1A second value N2Pulse shape PtypeAnd the length K of the pulse to be configured relative to a single symbol period. Wherein the first Flag bit FlagheadIs used for indicating whether the head part of the symbol is subjected to pulse forming or not, and the second Flag bit FlagtailIs used for indicating whether the tail part of the symbol is subjected to pulse forming or not, and the first numerical value N1The number of sampling points used for indicating pulse shaping in a single symbol and with amplitude weight not equal to 1, and the second value N2The number of sampling points for indicating pulse shaping outside a single symbol, the pulse shape PtypeFor indicating the shape of the pulse to be configured.
In a sixth aspect, an embodiment of the present invention provides a terminal device, where the terminal device includes:
a sending unit, configured to send configuration information to a base station, where the configuration information is used to indicate a pulse shape supported by a terminal device;
a receiving unit, configured to receive the pulse parameter of the pulse to be configured, which is notified by the base station;
and the configuration unit is used for configuring the filter coefficient according to the pulse parameter of the pulse to be configured.
With reference to the sixth aspect, in a first possible implementation manner of the sixth aspect, the receiving unit is specifically configured to:
receiving a dynamic signaling with a fixed period sent by a base station, wherein the dynamic signaling with the fixed period is used for notifying a pulse parameter of the pulse to be configured; alternatively, the first and second electrodes may be,
and receiving a real-time dynamic signaling sent by a base station, wherein the real-time dynamic signaling is used for informing the pulse parameters of the pulse to be configured.
With reference to the sixth aspect, in a second possible implementation manner of the sixth aspect, the signaling carries a pulse parameter of the pulse to be configured; or, the signaling carries the indication information of the pulse to be configured.
With reference to the sixth aspect, or the first possible implementation manner of the sixth aspect, or the second possible implementation manner of the sixth aspect, in a third possible implementation manner of the sixth aspect, the pulse shape supported by the terminal device is used to indicate whether the terminal device supports the pulse to be configured corresponding to the current communication scenario; the current communication scene belongs to a preset communication scene needing pulse forming processing.
With reference to the sixth aspect, or the first possible implementation manner of the sixth aspect, or the second possible implementation manner of the sixth aspect, or the third possible implementation manner of the sixth aspect, in a fourth possible implementation manner of the sixth aspect, the preset communication scenario that needs to be subjected to pulse shaping processing includes at least one of the following:
the current communication scene belongs to a preset scene needing to limit out-of-band power leakage, the terminal equipment is scheduled at the edge of a resource where different OFDM setting parameters coexist, the terminal equipment adopts a high-order modulation or high-order modulation coding strategy, the time-frequency fading currently corresponding to the terminal equipment reaches a preset degree, the resource position corresponding to the terminal equipment is positioned at the frame head and/or the frame tail of a data frame, and the physical channel currently positioned by the terminal equipment is a preset physical channel needing pulse forming; the OFDM setting parameters comprise cyclic prefix length and subcarrier width.
In a seventh aspect, an embodiment of the present invention provides a communication network device, where the communication network device includes a functional unit configured to perform part or all of the steps of any implementation manner of the first aspect of the embodiment of the present invention.
In an eighth aspect, an embodiment of the present invention provides a base station, where the base station includes a functional unit configured to perform part or all of the steps of any implementation manner of the second aspect of the present invention.
In a ninth aspect, an embodiment of the present invention provides a terminal device, where the terminal device includes a functional unit configured to perform part or all of the steps of any implementation manner of the third aspect of the embodiment of the present invention.
In an eighth aspect, an embodiment of the present invention provides a communication system, where the system includes: base station and terminal equipment, wherein:
the base station is the base station described in the fifth aspect or the eighth aspect;
the terminal device described in the sixth or ninth aspect of the terminal device.
By implementing the filter optimization method provided by the embodiment of the invention, the optimal receiving filter coefficient or the optimal sending filter coefficient is obtained by maximizing the signal-to-noise ratio of the receiving end, and the optimal receiving filter coefficient or the optimal sending filter coefficient is approximated by using the known window function, so that the signal-to-interference-and-noise ratio can be improved, and the demodulation performance can be improved; by implementing the filter configuration method provided by the embodiment of the invention, under the preset communication scene needing pulse forming processing, the filter of the transmitting end and/or the receiving end is configured through the pulse parameters of the pulse to be configured, so that the communication performance of the whole communication system can be improved, such as reducing out-of-band power leakage, improving signal-to-interference-and-noise ratio, reducing interference and the like.
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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIGS. 1A-1F are schematic diagrams of several possible application scenarios involving embodiments of the present invention;
FIG. 2 is a schematic flow chart of a filter optimization method according to an embodiment of the present invention;
FIG. 3 is a flow chart of a filter optimization method according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an example of a transceiver filter waveform provided by an embodiment of the present invention;
FIG. 5 is a flow chart of a filter configuration method according to an embodiment of the present invention;
fig. 6 is a schematic architecture diagram of a communication network device according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a base station according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a terminal device according to an embodiment of the present invention;
fig. 9 is a schematic diagram of an architecture of a transmitter according to an embodiment of the present invention;
fig. 10 is a schematic diagram of an implementation block diagram of a transmitter provided by an embodiment of the invention;
fig. 11 is a schematic diagram of another implementation block diagram of a transmitter provided by an embodiment of the invention;
fig. 12 is a schematic diagram of an architecture of a receiver provided by an embodiment of the present invention;
fig. 13 is a schematic diagram of an implementation block diagram of a receiver provided by an embodiment of the invention;
fig. 14 is a schematic diagram of another implementation block diagram of a receiver according to an embodiment of the present invention.
Detailed Description
The terminology used in the description of the embodiments of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
First, several possible application scenarios related to the embodiment of the present invention will be described with reference to fig. 1A to 1F. The method comprises the following specific steps:
as shown in fig. 1A, in an application scenario of Enhanced Mobile Broadband (eMBB) service, in order to implement more flexible resource allocation, an extended sub-band multicast/multicast Single Frequency Network (MBSFN) is generally adopted. Since multicast/multicast requires signal coverage enhancement, MBSFN and single cell transmission channels employ different OFDM Numerology (i.e., a set of numerical settings consisting of CP length and subcarrier width of OFDM) for data transmission. For example, MBSFN in existing systems employs extended CP against longer channel delay times. Under the condition that multiple OFDM numerologies coexist, the communication system can effectively limit out-of-band leakage through pulse shaping processing, reduce interference among resource blocks, reduce overhead of guard bands and the like.
As shown in fig. 1B, in resource scheduling, User Equipments (UEs) of different OFDM numerologies are allocated to different positions of a resource block. Users at (or near) the sidebands of a resource block typically experience severe inter-subband interference compared to users within the resource block (i.e., not near the sidebands). For a user on (or near) a sideband of a resource block, the interference suffered by the user can be reduced through a pulse shaping process.
As shown in fig. 1C, the communication system may adjust a Modulation and Coding Scheme (MCS) in real time according to the channel quality information. It can be understood that the higher the modulation order, the higher the signal-to-noise ratio of the transmission signal. Under the high-order modulation and coding strategy, the transmission signal with a higher modulation order can also obtain a better signal-to-noise ratio through pulse shaping processing.
As shown in fig. 1D, the existing CP-OFDM has some advantages in combating some frequency-selective channels (the channel delay spread length is smaller than the CP length), but if severe time-frequency fading occurs, i.e., the time offset and the channel delay spread length are larger than the CP or the doppler offset/phase noise is strong, the communication performance is severely attenuated. Under such channel conditions, the reliability of signal transmission can be improved by the pulse shaping process.
As shown in fig. 1E, a self-complete Time Division Duplex (TDD) frame structure for flexible switching has attracted a great deal of attention in 5G communication research. The self-completing TDD frame structure technology can realize the quick switching of uplink and downlink transmission and confirmation in the same TDD frame, can effectively reduce the transmission time delay and provides possibility for flexible frame structure design. In general, the position of a symbol in such a frame structure can be defined as four shapes: frame head (type1), frame end (type2), frame head and frame end (type3), intra (type 4). For symbols at the beginning and/or end of the frame, the interference due to channel fading, non-synchronization and time domain jitter can be reduced by the pulse shaping process.
As shown in fig. 1F, different Physical channels coexist, for example, a Physical Random Access Channel (PRACH) and a Physical Uplink Shared Channel (PUSCH) coexist, where the PRACH needs to support a longer multipath delay spread and a higher anti-asynchronization capability than the PUSCH, and thus, for the PRACH, robustness against symbol-level time offset can be achieved through a pulse shaping process. For example, the filter corresponds to a pulse length corresponding to a plurality of symbol periods.
It should be noted that, the embodiments of the present invention may also be applied to other communication scenarios where communication performance needs to be improved, which is not described herein again.
It should be noted that the pulse shaping according to the embodiments of the present invention refers to subcarrier-level filtering (i.e. filtering for subcarriers) of a transmission signal s (t) described by the following formula in an OFDM system, or also referred to as pulse shaping of an OFDM signal:
s(t)＝∑m∑nam,ngTX(t-nT)2πjmFT
where s (t) is the transmission signal of an OFDM system, am,nIs data on the m-th subcarrier and the n-th symbol, T is an OFDM symbol period, F is a subcarrier spacing of OFDM, gTXRepresenting the transmit end waveform or (prototype) transmit pulse. And gTXThe opposite receive-side waveform or (prototype) receive pulse may be expressed as gammaRX. In the existing CP-OFDM system, the transmit-end waveform gTXAnd a receiving end waveform gammaRXFixed in a rectangular shape by default.
In order to solve the problem caused by pulse forming by fixedly adopting a rectangular window in the conventional OFDM communication system, the embodiment of the invention provides a filter optimization method, a filter configuration method, related equipment and a system, which can improve the communication performance by optimizing and configuring a filter and are used for supporting different communication scenes. The following describes a filter optimization method, a filter configuration method, related devices and systems according to embodiments of the present invention in detail with reference to the accompanying drawings.
Fig. 2 is a schematic flow chart of a filter optimization method according to an embodiment of the present invention. As shown in fig. 2, the method includes:
s101, according to the target adjacent channel leakage ratio requirement, determining the coefficient of the sending filter meeting the target adjacent channel leakage ratio requirement
Figure BDA0000956051820000161
S103, according to the channel statistical characteristic H and the requirement of meeting the target adjacent channel leakage ratio
Figure BDA0000956051820000162
Calculating the SINR of the receiving endRXMaximum preferred receive filter coefficient
Figure BDA0000956051820000163
Wherein, the channel statistical characteristics, the transmission filter coefficient gTX(t), and reception filter coefficient γRX(t) determining the SINR of the receiving endRXThe variable of (2).
S105, approximating the preferred receiving filter coefficient by using a known window function
Figure BDA0000956051820000164
Obtaining the preferred receive filter coefficients
Figure BDA0000956051820000165
Approximate receive filter coefficients
Figure BDA0000956051820000166
The above-mentioned
Figure BDA0000956051820000167
For configuring the receive-side filter.
In the embodiment of the invention, the coefficient g of the sending filterTX(t) reception filter coefficient γRX(t) may each be characterized by a predefined pulse parameter. The pulse parameters include: all or part of the set of parameters is preset.
Specifically, the preset parameter set may be as shown in table 1:
Figure BDA0000956051820000168
Figure BDA0000956051820000171
TABLE 1
Wherein α represents a roll-off coefficient of a Raised Cosine (RC) filter; n is a radical ofCPIs the length of the OFDM cyclic prefix, NsymIs the number of sampling points corresponding to a single symbol period. It should be noted that table 1 is only one implementation manner of the embodiment of the present invention, and may also be different in practical application, and should not be limited.
In the embodiment of the present invention, the preset parameter set may also include some OFDM parameters predefined by the system, for example, NCPAnd NsymOr other parameters, and are not limiting herein.
As described in "Definitions" of Table 1, the first Flag bit FlagheadCan be used for indicating whether the head part of the symbol is subjected to pulse forming or not, and a second Flag bit Flagtai1Can be used for indicating whether the tail part of the symbol is subjected to pulse forming or not, and the first value N1Can be used for indicating the number of sampling points which are used for pulse shaping in a single symbol and have amplitude weights not equal to 1, and a second value N2Can be used for indicating the number of sampling points P for pulse forming outside a single symboltypeMay be used to indicate the shape of the pulse to be configured and K may be used to indicate the length of the pulse to be configured relative to a single symbol period.
In some possible implementations, if the first Flag is setheadEqual to the first enable value, the first Flag bit FlagheadIndicating that the head of the symbol is subjected to pulse forming, otherwise indicating that the head of the symbol is not subjected to pulse forming. For example, as shown in table 1, the first Flag bit FlagheadIs a 1-bit flag bit and the first enable value is 1. Then, when Flag is setheadWhen the number is equal to 1, the head of the symbol is subjected to pulse forming; when Flag is presentheadWhen 0 is equal to the above value, the symbol head is not pulse-shaped. The example is only one implementation manner of the embodiment of the present invention, and may be different in practical application, and should not be construed as limiting.
Likewise, in some possible implementations, if the second Flag is settailEqual to the second enable value, then the second FlagtailAnd indicating that the tail part of the symbol is subjected to pulse forming, otherwise indicating that the tail part of the symbol is not subjected to pulse forming.
It should be noted that the first enable value and the second enable value may be defined according to actual requirements, and are not limited herein.
In embodiments of the invention, a set of pulse parameters, e.g., (N)CP，N1，N2) A specific pulse shape, i.e. filter coefficients (also called filter shape factor), can be characterized accordingly. Also, the performance of a filter is typically determined by the pulse shape to which the filter corresponds. Therefore, a filter with a better pulse shape tends to have better ability to limit out-of-band power leakage, improve signal to interference plus noise ratio, etc.
The optimization process of the reception filter coefficients and the transmission filter coefficients is described in detail below from two points, respectively.
In a first aspect, with respect to the optimization process of the receive filter coefficients: under the condition of determining the coefficients of the transmission filter, the SINR (signal to interference plus noise ratio) of a receiving end can be mainly maximizedRXThe receive filter coefficients are optimized for the purpose. The following were used:
in particular, the signal-to-interference-and-noise ratio SINR of the receiving end is enabledRXMaximum preferred receive filter coefficient
Figure BDA0000956051820000181
Can be represented by the following algorithm one:
Figure BDA0000956051820000182
wherein the channel statistical properties, such as delay spread and doppler frequency shift, can be characterized by a channel scattering function H; the receiving end SINRRXCan be determined by the channel statistical characteristics H, the transmission filter coefficients gTX(t), and the reception filter coefficient γRX(t) determination, which may be expressed as SINRRX{H,gTX(t),γRX(t)}。
As can be appreciated, the adjacent channel leakage ratio ACLR and the transmit filter coefficient gTX(t) correlation, which may be expressed herein as
Figure BDA0000956051820000183
Thus, for target adjacent channel leakage ratio requirements, e.g.
Figure BDA0000956051820000184
Can solve the problem of meeting the requirement
Figure BDA0000956051820000185
In a specific implementation, the base station may select a group of pulse parameters satisfying the target adjacent channel leakage ratio requirement from a pulse parameter table corresponding to a known window function to characterize the pulse parameters
Figure BDA0000956051820000186
For example, the pulse parameter table corresponding to the raised cosine window function can be as shown in Table 2 (Flag)tail＝1,Flaghead1), where table 2 provides several CP lengths and their corresponding N1And N2And (3) a range.
NCP N1 N2
36 12～16 12～14
72 30～32 24～30
144 60～64 40～60
TABLE 2
It should be noted that table 2 is only used for explaining the embodiments of the present invention and should not be construed as limiting.
In the solution of algorithm one above, since the channel statistical property H is known, and the filter coefficient g is transmittedTX(t) is equal to
Figure BDA0000956051820000187
Therefore, a solution satisfying the above algorithm can be obtained
Figure BDA0000956051820000188
That is, under the condition of determining the transmission filter and the channel characteristics, the SINR of the receiving end can be theoretically obtainedRXMaximum receive filter coefficient, i.e.
Figure BDA0000956051820000189
The preferred receive filter coefficients (i.e., the theoretical calculated coefficients) are calculated for practical use
Figure BDA0000956051820000191
) The theoretically calculated can be approximated by a known window function
Figure BDA0000956051820000192
Finally obtaining the optimal receiving filter coefficient
Figure BDA0000956051820000193
Approximate suboptimal receive filter coefficients
Figure BDA0000956051820000194
It is assumed that the known window function is a Raised Cosine (RC) filter. Then, the sum can be solved by the norm regularization mode
Figure BDA0000956051820000195
Suboptimal receive filter coefficients for infinite approximation
Figure BDA0000956051820000196
For example
Figure BDA0000956051820000197
The example is only one implementation manner of the embodiment of the present invention, and other algorithms may be used for solving the problem in practical application, which should not be limited.
The approximation may also be such that a range of errors is met
For example, as shown in fig. 3, the waveform of a transmission/reception filter in a communication system in which the channel characteristics are known. Wherein the content of the first and second substances,
Figure BDA0000956051820000198
is the raised cosine window function of the sending end, and the corresponding pulse parameters are as follows: n1 ═ 0, N2 ═ 16;
Figure BDA0000956051820000199
is the preferred receive filter coefficients obtained by the algorithm one above;
Figure BDA00009560518200001910
is approximated by a raised cosine window function
Figure BDA00009560518200001911
The resulting coefficients of the receive filter are then compared,
Figure BDA00009560518200001912
the corresponding pulse parameters are: n1 ═ 16, N2 ═ 0.
It should be noted that, in practical applications, the known window function used for approximating the preferred receiving filter coefficient may also be a gaussian window function, a rectangular window function, or the like, and is not limited herein.
In a second aspect, with respect to the optimization process of the transmit filter coefficients: according to the receiving filter coefficient
Figure BDA00009560518200001913
Further optimization of the transmit filter coefficients gTX(t); in particular, at γRX(t) is equal to
Figure BDA00009560518200001914
In this case, the signal to interference plus noise ratio (SINR) of the transmitting end can be mainly maximizedTXThe transmit filter coefficients are optimized for the purpose. The following were used:
in particular, the signal-to-interference-and-noise ratio SINR of the sending end is enabledTXMaximum preferred transmit filter coefficient
Figure BDA00009560518200001915
Can be represented by the following algorithm two:
Figure BDA00009560518200001916
thus, the statistical characteristic H is known at the channel, and the reception filter coefficient γ isRX(t) is equal to
Figure BDA00009560518200001917
Under the condition of (2), the algorithm can be solved
Figure BDA00009560518200001918
Likewise, the preferred transmit filter coefficients (i.e., the coefficients of the transmit filter) are theoretically calculated for practical use
Figure BDA00009560518200001919
) The theoretically calculated can be approximated by a known window function
Figure BDA00009560518200001920
Finally obtaining the optimal transmission filter coefficient
Figure BDA00009560518200001921
Approximate transmit filter coefficients
Figure BDA00009560518200001922
Here can be
Figure BDA00009560518200001923
Referred to as transmit filter coefficients. About obtaining
Figure BDA00009560518200001924
The approximation method of (2) can be obtained by referring to the above
Figure BDA00009560518200001925
The process of (2) is not described in detail herein.
As can be appreciated, it is possible to,
Figure BDA0000956051820000201
can be realized in the transmitting filter gTX(t) obtaining the maximum receiving end SINR under the determined conditionRXThe demodulation performance of the communication system is improved;
Figure BDA0000956051820000202
can be realized in the receiving filter gammaRX(t) is equal to
Figure BDA0000956051820000203
Under the condition of (2), obtaining the maximum signal-to-interference-and-noise ratio SINR of the sending endTXThe demodulation performance of the communication system is further improved.
As shown in fig. 4, the embodiment of the present invention may further optimize the transmission filter coefficient g progressively through an iterative optimization processTX(t) and reception filter coefficient γRX(t) of (d). Wherein:
suppose that the ith iteration is for the transmit filter coefficient gTX(t) optimization process. In the ith round, the preferred transmit filter coefficients are theoretically calculated as
Figure BDA0000956051820000204
The coefficient of the transmission filter obtained by approximating the actual window function is
Figure BDA0000956051820000205
Then, the (i + 1) th iteration may be for the receive filter coefficient γRX(t) optimization process. The method specifically comprises the following steps:
first, the preferred receive filter coefficients can be theoretically calculated by the algorithm described below
Figure BDA0000956051820000206
Figure BDA0000956051820000207
Wherein H is the predetermined channel statistical property, and i is a positive integer;
the theoretically calculated can then be approximated using a known actual window function, such as an RC window function
Figure BDA0000956051820000208
Finally obtaining the receiving filter coefficient
Figure BDA0000956051820000209
As can be inferred, the following i +2 th iteration may be for the transmit filter coefficients gTX(t) once again. The method specifically comprises the following steps:
first, the optimal transmit filter coefficients can be theoretically calculated by the following algorithm
Figure BDA00009560518200002010
Figure BDA00009560518200002011
Wherein H is the predetermined channel statistical property, and i is a positive integer;
the theoretically calculated can then be approximated using a known actual window function, such as an RC window function
Figure BDA00009560518200002012
Finally obtaining the receiving filter coefficient
Figure BDA00009560518200002013
By analogy, the subsequent (after the (i + 2) th iteration process can be repeatedly executed with reference to the aforementioned (before the (i + 2) th iteration process, which is not described herein again.
By implementing the embodiment of the invention, under the condition that the coefficient of the sending filter is known, the optimal coefficient of the receiving filter is obtained by maximizing the signal-to-noise ratio of the receiving end, and the optimal coefficient of the receiving filter is approximated by using the known window function, so that the coefficient of the receiving filter which is similar to the optimal coefficient of the receiving filter and can be actually used for configuring the receiving end filter is finally obtained, the signal-to-interference-and-noise ratio of the receiving end is improved, and the demodulation performance is improved; and then according to the optimized receiving filter coefficient, further obtaining an optimal sending filter coefficient by maximizing the signal-to-interference-and-noise ratio of the sending end, and approximating the optimal sending filter coefficient by using a known window function, so that the sending filter coefficient which is approximate to the optimal sending filter coefficient and can be actually used for configuring the sending end filter is obtained, the signal-to-interference-and-noise ratio of the sending end is further improved, and the demodulation performance is improved.
The filter configuration method provided by the embodiment of the present invention will be described below. The filter configuration method can be used for configuring the filter coefficients obtained by the filter optimization method corresponding to the embodiment of fig. 2, namely a group of pulse parameters representing the filter coefficients, to the filter. The filter configuration method is described in detail below in conjunction with fig. 5-6.
Fig. 5 is a schematic flow chart of a filter configuration method according to an embodiment of the present invention. As shown in fig. 5, the method may include:
s201, if the current communication scenario belongs to a preset communication scenario that needs to be subjected to pulse shaping processing, the base station may determine a pulse to be configured for the current communication scenario.
S203, the terminal equipment sends configuration information to the base station, wherein the configuration information is used for indicating the pulse shapes supported by the terminal equipment. Specifically, the pulse shapes supported by the terminal device may include: raised cosine pulses, gaussian pulses, rectangular pulses, etc.
S205, correspondingly, the base station receives the configuration information sent by the terminal equipment. And the base station can judge whether the terminal equipment supports the pulse to be configured or not according to the configuration information and judge whether pulse forming processing needs to be carried out on the terminal equipment side or not.
S207, if the base station determines that the terminal device supports the pulse to be configured and determines that pulse shaping processing needs to be performed at the terminal device side, the base station may notify the terminal device of the pulse parameter of the pulse to be configured. Specifically, the pulse parameter may be used to configure a filter coefficient of the terminal device.
It is understood that if the pulse shape supported by the terminal device by default is enough to cover the pulse shape that the base station may configure, S203 is not a necessary step of the embodiment of the present invention, and accordingly, the base station does not need to determine whether the terminal device supports the pulse to be configured in S205.
It should be noted that S203 is not limited to S201. Namely: the terminal equipment can send the configuration information to the base station at any time, and is not limited by whether the current communication scene belongs to a preset communication scene needing pulse forming processing or not.
In this embodiment of the present invention, the preset communication scenario requiring pulse shaping processing may include, but is not limited to: fig. 1A-1F illustrate communication scenarios. The method specifically comprises the following steps: the communication scenario belongs to one or more of communication scenarios such as a preset scenario requiring limitation of out-of-band power leakage, a scenario in which a terminal device is scheduled at a resource edge where different OFDM Numerology (i.e., a set of values consisting of a CP length and a subcarrier width of OFDM) coexist, a terminal device employing a high-order modulation or high-order modulation coding strategy, a time-frequency fading currently corresponding to the terminal device reaching a preset degree, a resource position corresponding to the terminal device being at a frame header and/or a frame tail of a data frame, a physical channel currently located by the terminal device being a preset physical channel requiring pulse forming, and the like.
It should be noted that, in practical applications, the preset scenario may also include other communication scenarios that need to be subjected to pulse shaping processing, which is not limited herein.
In the embodiment of the present invention, after determining that the pulse shaping processing is required in the current communication scenario, the base station may further determine whether the pulse shaping processing needs to be performed at the transmitting end, the receiving end, or both the transmitting end and the receiving end.
In a possible implementation manner, the base station may determine whether to perform pulse modulation on the receiving end according to demodulation performance of the receiving end, coding and modulation order of the signal, and the like.
For example, if the demodulation performance of the receiving end is low, it is determined that pulse modulation needs to be performed at the receiving end, so as to improve the signal-to-interference-and-noise ratio of the receiving end and improve the demodulation performance.
For another example, since the transmission signal with a higher modulation order has a higher requirement for the signal-to-noise ratio, if the modulation order of the signal is higher, it may be determined that pulse modulation needs to be performed at the receiving end to improve the signal-to-interference-and-noise ratio and ensure the transmission performance.
The example is only one implementation manner of the embodiment of the present invention, and may also be different in practical applications, and should not be construed as a limitation.
In a possible implementation manner, the base station may determine whether pulse modulation needs to be performed at the sending end according to the service type of the transmission service, the requirement of the communication scenario, the overhead of the guard band, and the like.
For example, if the transmission service is the uMTC service, it is determined that pulse modulation is required at the transmitting end to ensure reliability of the transmission signal.
For another example, if the current communication scenario belongs to the preset scenario requiring pulse modulation, it is determined that pulse modulation is required at the transmitting end, so as to improve the communication performance of the current communication scenario.
For another example, if the overhead of the guard band between different users is large, it is determined that pulse modulation needs to be performed at the transmitting end to reduce the overhead of the guard band.
The example is only one implementation manner of the embodiment of the present invention, and may also be different in practical applications, and should not be construed as a limitation.
It should be noted that the base station may also determine at which end the pulse shaping process needs to be performed according to a predefined filter configuration policy.
For example, a plurality of levels of out-of-band power leakage indicators are predefined; if the out-of-band power leakage in the current communication scene is higher than a first leakage index (high leakage), indicating that pulse forming processing needs to be carried out at the transmitting end and the receiving end so as to limit the out-of-band power leakage to the maximum extent and ensure the communication performance; if the out-of-band power leakage in the current communication scene is in a second leakage index (moderate leakage), indicating that pulse forming processing needs to be performed at the sending end so as to reduce the interference of the sending end on other users; if the out-of-band power leakage in the current communication scene is lower than the third leakage index (light leakage), it indicates that the pulse forming processing can be performed only at the receiving end, and the interference of other users to the receiving end is reduced.
It should be noted that the base station may also determine, according to other strategies, which end needs to be subjected to the pulse shaping processing, and the embodiment of the present invention is not limited thereto.
It can be understood that, in the uplink transmission process, if it is determined that pulse modulation needs to be performed at the sending end, it indicates that pulse modulation needs to be performed at the terminal device side, and the pulse parameter of the pulse to be configured may be used to configure a sending filter of the terminal device; in the downlink transmission process, if it is determined that pulse modulation needs to be performed at the receiving end, it also indicates that pulse modulation needs to be performed at the terminal device side, and the pulse parameter of the pulse to be configured may be used to configure a receiving filter of the terminal device.
It can be understood that, in the uplink transmission process, if it is determined that pulse modulation needs to be performed at the receiving end, it indicates that pulse modulation needs to be performed at the base station side, and the pulse parameter of the pulse to be configured may be used to configure a receiving filter of the base station; in the downlink transmission process, if it is determined that pulse modulation needs to be performed at the transmitting end, it also indicates that pulse modulation needs to be performed at the base station side, and the pulse parameter of the pulse to be configured can be used for configuring a transmitting filter of the base station.
In an embodiment of the present invention, the pulse parameters may include: all or part of the set of parameters is preset.
Specifically, the preset parameter set may refer to table 1 and related contents in the embodiment of fig. 2, which are not described herein again.
In an embodiment of the present invention, a set of pulse parameters correspondingly characterizes a specific pulse shape. As described in "Definitions" of Table 1, the first Flag bit FlagheadCan be used for indicating whether the head part of the symbol is subjected to pulse forming or not, and a second Flag bit Flagtai1Can be used for indicating whether the tail part of the symbol is subjected to pulse forming or not, and the first value N1Can be used for indicating the number of sampling points which are used for pulse shaping in a single symbol and have amplitude weights not equal to 1, and a second value N2Can be used for indicating the number of sampling points P for pulse forming outside a single symboltypeMay be used to indicate the shape of the pulse to be configured and K may be used to indicate the length of the pulse to be configured relative to a single symbol period.
In the embodiment of the present invention, the different communication scenarios requiring pulse shaping processing may correspond to different pulses to be configured (i.e., different pulse parameters). As shown in table 3, the pulse to be configured is corresponding to the scene where the out-of-band leakage needs to be limited:
NCP N1 N2
short CP 144 20～72 16～72
Long CP 512 60～256 40～256
TABLE 3
In an implementation manner, for the different communication scenarios requiring pulse shaping processing, the filter optimization method described in the embodiment of fig. 2 may be used to obtain pulse parameters (i.e., filter coefficients) of pulses to be configured corresponding to the different communication scenarios.
In another implementation manner, for the different communication scenarios that need to be pulse-shaped, pulses to be configured corresponding to the different communication scenarios may be preset.
For example, the pulse to be configured corresponding to the scenario requiring out-of-band leakage limitation is statically defined by a protocol as shown in table 2. The example is only one implementation manner of the embodiment of the present invention, and may also be different in practical applications, and should not be construed as a limitation.
In the embodiment of the present invention, the pulse parameter of the pulse to be configured may be notified to the terminal device through the following several implementation manners:
in a first implementation, the terminal device may be informed of the burst parameter by using dynamic signaling with a fixed period, for example, RRC signaling.
In a second implementation, the terminal device may be notified of the pulse parameter by using real-time dynamic signaling, for example, scheduling signaling.
In a third implementation manner, pulses to be configured corresponding to different communication scenarios may be statically defined through a protocol, and therefore, the terminal device may obtain parameters to be configured corresponding to the current communication scenario by determining the shape of the current communication scenario. For example, the pulse parameters shown in table 3 are statically defined by a protocol, that is, the pulses to be configured corresponding to the scenes that need to limit out-of-band leakage are characterized. The example is only one implementation manner of the embodiment of the present invention, and may also be different in practical applications, and should not be construed as a limitation.
In the embodiment of the present invention, if the terminal device is notified of the parameter to be configured through signaling, then:
in one implementation, the pulse parameters may be directly carried in the signaling; the terminal equipment can directly carry out filter configuration according to the pulse parameters.
In another implementation, the signaling may also carry indication information of the pulse parameter; the terminal device needs to determine the pulse parameter indicated by the indication information according to the indication information, and then performs filter configuration according to the pulse parameter.
For example, the indication information of the pulse parameter is a pulse shape, wherein the pulse parameter corresponding to the pulse shape is already specified by a preset protocol; then, the terminal device may obtain the pulse parameters corresponding to the pulse shape according to a protocol.
For another example, the indication information of the pulse parameter is an index of the pulse to be configured in a preset database, where the preset database can be accessed by the terminal device side; then, the terminal device may search the preset database for the pulse parameter corresponding to the index.
The example is only one implementation manner of the embodiment of the present invention, and may also be different in practical applications, and should not be construed as a limitation.
By implementing the embodiment of the invention, under the preset communication scene needing pulse forming processing, the filter of the transmitting end and/or the receiving end is configured by the pulse parameter of the pulse to be configured, so that the communication performance of the whole communication system can be improved, such as reducing out-of-band power leakage, improving signal-to-interference-and-noise ratio, reducing interference and the like.
Fig. 6 is a schematic structural diagram of a communication network device according to an embodiment of the present invention. The communication network device may be used to perform the filter optimization method described in the embodiment of fig. 2. As shown in fig. 6, the communication network device 60 may include: a determination unit 601, a first calculation unit 603 and a first approximation unit 605, wherein:
a determining unit 601, configured to determine, according to a target adjacent channel leakage ratio requirement, a transmission filter coefficient meeting the target adjacent channel leakage ratio requirement
Figure BDA0000956051820000251
A first calculating unit 603 for calculating a target adjacent channel leakage ratio according to the channel statistical characteristic H and the signal quality
Figure BDA0000956051820000252
Calculating the SINR of the receiving endRXMaximum preferred receive filter coefficient
Figure BDA0000956051820000253
Wherein, the channel statistical characteristics, the transmission filter coefficient gTX(t), and reception filter coefficient γRX(t) determining the SINR of the receiving endRXA variable of (d);
a first approximation unit 605 for approximating the preferred receive filter coefficients using a known window function
Figure BDA0000956051820000254
Obtaining the preferred receive filter coefficients
Figure BDA0000956051820000255
Approximate receive filter coefficients
Figure BDA0000956051820000256
The above-mentioned
Figure BDA0000956051820000257
For configuring the receive-side filter.
In the embodiment of the present invention, the pulse parameter may be all or part of a preset parameter set. Specifically, the preset parameter set may refer to table 1 and related contents in the embodiment of fig. 2, which are not described herein again.
In this embodiment of the present invention, the first calculating unit 603 may be specifically configured to obtain the SINR at the receiving end through the following algorithmRXMaximum preferred receive filter coefficient
Figure BDA0000956051820000258
Figure BDA0000956051820000261
Wherein, gTX(t) is equal to
Figure BDA0000956051820000262
Specifically, for the specific implementation of the first calculating unit 603, reference may be made to relevant contents in the embodiment of the method in fig. 2, and details are not repeated here.
As shown in fig. 6, the communication network device 60 may further include: a second calculation unit 607 and a second approximation unit 609, wherein:
a second calculation unit 607 for calculating a channel statistic H based on the channel statistic and the channel statistic
Figure BDA0000956051820000263
Calculating the SINR of the sending endTXMaximum preferred transmit filter coefficient
Figure BDA0000956051820000264
Wherein the channel statistical characteristics, the transmission filter coefficients gTX(t), and the reception filter coefficient γRX(t) determining the SINR of the transmitting endTXA variable of (d);
a second approximation unit 609 for approximating said preferred transmit filter coefficients using a known window function
Figure BDA0000956051820000265
Obtaining the optimal transmit filter coefficients
Figure BDA0000956051820000266
Approximate transmit filter
Figure BDA0000956051820000267
The above-mentioned
Figure BDA0000956051820000268
For configuring the transmit-side filter.
In this embodiment of the present invention, the second calculating unit 607 may be specifically configured to obtain the SINR of the transmitting end by the following algorithmTXMaximum preferred transmit filter coefficient
Figure BDA0000956051820000269
Figure BDA00009560518200002610
Wherein，γRX(t) is equal to
Figure BDA00009560518200002611
Specifically, for the specific implementation of the second calculating unit 607, reference may be made to relevant contents in the embodiment of the method in fig. 2, and details are not repeated here.
Further, the communication network device 60 may further include: and an iterative optimization unit. The iteration unit may be to: progressive optimization of the transmit filter coefficients g by an iterative optimization processTX(t) and reception filter coefficient γRX(t); wherein:
in round i +1, the preferred receive filter coefficients are calculated by the following algorithm
Figure BDA00009560518200002612
Figure BDA00009560518200002613
Wherein, gTX(t) is equal to
Figure BDA00009560518200002614
Figure BDA00009560518200002615
Is the transmit filter coefficient obtained and preferred in the ith round
Figure BDA00009560518200002616
The approximate transmit filter coefficients of the transmit filter coefficients,
Figure BDA00009560518200002617
is calculated in the ith round to ensure that the signal to interference plus noise ratio (SINR) of a transmitting endTXA maximum preferred transmit filter coefficient;
alternatively, in round i +1, the preferred transmit filter coefficients are calculated by the following algorithm
Figure BDA00009560518200002618
Figure BDA0000956051820000271
Wherein, γRX(t) is equal to
Figure BDA0000956051820000276
Is the reception filter coefficient obtained and preferred in the ith round
Figure BDA0000956051820000274
The approximate coefficients of the receive filter are,
Figure BDA0000956051820000275
is obtained by calculation in the ith round to ensure that the signal to interference plus noise ratio (SINR) of a receiving endRXA maximum preferred receive filter coefficient;
wherein i is a positive integer.
Specifically, for the specific implementation of the iteration unit, reference may be made to related contents in the embodiment of the method in fig. 2 and fig. 4, which are not described herein again.
It is understood that the detailed implementation of the functional units included in the communication network device 60 may refer to the content of the method embodiment in fig. 2, and will not be described herein again.
Fig. 7 is a schematic structural diagram of a base station according to an embodiment of the present invention. As shown in fig. 7, the base station 70 may include: a determination unit 701, a reception unit 703, a judgment unit 705 and a notification unit 707, wherein:
a determining unit 701, configured to determine, by a base station, a pulse to be configured for a current communication scenario if the current communication scenario belongs to a preset communication scenario that needs to be subjected to pulse shaping processing; the pulse to be configured is characterized by a set of pulse parameters;
a receiving unit 703, configured to receive configuration information sent by a terminal device, where the configuration information is used to indicate a pulse shape supported by the terminal device;
a determining unit 705, configured to determine, according to the configuration information, whether the terminal device supports the pulse to be configured, and determine whether pulse shaping processing needs to be performed on the terminal device side;
a notifying unit 707, configured to notify a terminal device of a pulse parameter of the pulse to be configured if the configuration information indicates that the terminal device supports the pulse to be configured and it is determined that pulse shaping processing needs to be performed on the terminal device side; the pulse parameters are used for configuring filter coefficients of the terminal equipment.
Specifically, the content in the embodiment of the method in fig. 5 may be referred to in the preset communication scenario that needs to be subjected to pulse shaping processing, and details are not repeated here.
Specifically, the pulse parameter may be all or part of a preset parameter set. Specifically, the preset parameter set may refer to table 1 and related contents in the embodiment of fig. 2, which are not described herein again.
Specifically, the determining unit 705 may be specifically configured to: and judging whether pulse modulation needs to be carried out at a sending end according to at least one item of the service type of the transmission service, the preset requirement of the communication scene and the overhead of a guard band.
Specifically, the determining unit 705 may be specifically configured to: : and judging whether the pulse modulation is needed at the receiving end according to at least one of the demodulation performance of the receiving end and the encoding and modulation orders of the signals.
Further, the base station 70 may further include: a configuration unit, configured to configure a filter coefficient at a base station side according to a pulse parameter of the pulse to be configured if pulse shaping processing needs to be performed at the base station side; the pulse parameters are used to configure filter coefficients of the base station.
It can be understood that, in the uplink transmission process, if it is determined that pulse modulation needs to be performed at the sending end, it indicates that pulse modulation needs to be performed at the terminal device side, and the pulse parameter of the pulse to be configured may be used to configure a sending filter of the terminal device; in the downlink transmission process, if it is determined that pulse modulation needs to be performed at the receiving end, it also indicates that pulse modulation needs to be performed at the terminal device side, and the pulse parameter of the pulse to be configured may be used to configure a receiving filter of the terminal device.
It can be understood that, in the uplink transmission process, if it is determined that pulse modulation needs to be performed at the receiving end, it indicates that pulse modulation needs to be performed at the base station side, and the pulse parameter of the pulse to be configured may be used to configure a receiving filter of the base station; in the downlink transmission process, if it is determined that pulse modulation needs to be performed at the transmitting end, it also indicates that pulse modulation needs to be performed at the base station side, and the pulse parameter of the pulse to be configured can be used for configuring a transmitting filter of the base station.
Specifically, the notification unit 707 may specifically be configured to: notifying the pulse parameters to the terminal equipment by using dynamic signaling with a fixed period; or, the pulse parameters are notified to the terminal device by using real-time dynamic signaling.
In a specific implementation, the signaling may directly carry the pulse parameter of the pulse to be configured, and the signaling may also carry indication information of the pulse to be configured.
It can be understood that the specific implementation of the functional units included in the base station 70 may refer to the functions of the base station described in the embodiment of the method in fig. 5, and are not described herein again.
Corresponding to the base station 70, the embodiment of the present invention further provides a terminal device.
Fig. 8 is a schematic structural diagram of a base station according to an embodiment of the present invention. As shown in fig. 8, the terminal device 80 may include: a sending unit 801, a receiving unit 803 and a configuration unit 805, wherein:
a sending unit 801, configured to send configuration information to a base station, where the configuration information is used to indicate a pulse shape supported by a terminal device;
a receiving unit 803, configured to receive a pulse parameter of the pulse to be configured, which is notified by a base station;
a configuration unit 805, configured to configure a filter coefficient according to the pulse parameter of the pulse to be configured.
In the embodiment of the present invention, the pulse shape supported by the terminal device may be used to indicate whether the terminal device supports the pulse to be configured corresponding to the current communication scenario; the current communication scene belongs to a preset communication scene needing pulse forming processing. The preset communication scenario requiring pulse shaping processing may refer to the content in the embodiment of the method in fig. 5, and is not described herein again.
Specifically, the pulse parameter may be all or part of a preset parameter set. Specifically, the preset parameter set may refer to table 1 and related contents in the embodiment of fig. 2, which are not described herein again.
Specifically, the receiving unit 803 may specifically be configured to: receiving a dynamic signaling with a fixed period sent by a base station, wherein the dynamic signaling with the fixed period is used for notifying a pulse parameter of the pulse to be configured; or receiving a real-time dynamic signaling sent by the base station, where the real-time dynamic signaling is used to notify the pulse parameters of the pulse to be configured.
In a specific implementation, the signaling may directly carry the pulse parameter of the pulse to be configured, and the signaling may also carry indication information of the pulse to be configured.
It can be understood that specific implementation of the functional unit included in the terminal device 80 may refer to the function of the terminal device described in the embodiment of the method in fig. 5, which is not described herein again.
To facilitate the implementation of the above-described filter configuration method, the following provides a schematic diagram of the architecture of a transmitter and a receiver. Specifically, during the uplink communication process, the transmitter may be integrated in the terminal device, and the receiver may be integrated in the base station; during the downlink communication, the transmitter may be integrated in the base station, and the receiver may be integrated in the terminal device.
Fig. 9 is a schematic diagram of an architecture of a transmitter according to an embodiment of the present invention. The transmitter is used for carrying out pulse forming processing on the transmission signal at the transmitting end. As shown in fig. 9, the transmitter 10 may include: a pulse shaping controller 101, a pulse shaping filter 102, an Inverse Fourier Transform (IFT)103, and a parallel-to-serial conversion (P/S) module 104, wherein:
the inverse fourier transform module 103 may be configured to: performing inverse fourier transform on the baseband modulation signal subjected to the serial-to-parallel conversion, and outputting the transformed signal to the pulse shaping filter 102;
the pulse forming controller 101 may be configured to: receiving a pulse configuration signaling, generating a pulse parameter corresponding to a pulse to be configured according to the pulse configuration signaling, and outputting the pulse parameter to the pulse shaping filter 102; the pulse shaping filter 102 may be used to: performing subcarrier-level filtering on an output signal of the inverse fourier transform module 103, and performing pulse shaping processing on the output signal of the inverse fourier transform module 103 according to the pulse parameters; and outputs the processed signals to the P/S module 104;
the P/S module 104 is configured to: and serially outputting the signals processed by the pulse shaping filter.
In some possible implementations, if the first Flag is setheadEqual to the first enable value, the first Flag bit FlagheadIndicating that the head of the symbol is subjected to pulse forming, otherwise indicating that the head of the symbol is not subjected to pulse forming. For example, as shown in table 1, the first Flag bit FlagheadIs a 1-bit flag bit and the first enable value is 1. Then, when Flag is setheadWhen the number is equal to 1, the head of the symbol is subjected to pulse forming; when Flag is presentheadWhen 0 is equal to the above value, the symbol head is not pulse-shaped. The example is only one implementation manner of the embodiment of the present invention, and may be different in practical application, and should not be construed as limiting.
Likewise, in some possible implementations, if the second Flag is settailEqual to the second enable value, then the second FlagtailAnd indicating that the tail part of the symbol is subjected to pulse forming, otherwise indicating that the tail part of the symbol is not subjected to pulse forming.
It should be noted that the first enable value and the second enable value may be defined according to actual requirements, and are not limited herein.
The following further describes a specific implementation of the transmitter 10 according to the embodiment of the present invention with reference to fig. 10 and 11. Wherein: the transmitter 10 corresponding to fig. 10 is preferably applied in a scenario where the length of the pulse shape is small (e.g. said K ≦ 2), and the transmitter 10 corresponding to fig. 11 is preferably applied in a scenario where the length of the pulse shape is large (e.g. said K > 2).
In one implementation of an embodiment of the invention, the transmitter 10 may be as shown in fig. 10. Wherein: the inverse fourier transform module 103, the parallel-to-serial conversion (P/S) module 104, and the pulse shaping controller 101 are the same as those in the embodiment of fig. 9, and are not described again; the pulse shaping filter 102 may further include, as shown in fig. 10: an add module 1021, a windowing module 1023, a compute module 1025, and a storage module 1027.
Flag at the first Flag bitheadEqual to the first enabled value (e.g., "1"), the adding module 1021, the windowing module 1023 and the calculating module 1025 can be jointly used for pulse shaping the header of the OFDM symbol of the output signal of the inverse fourier transform module 103. Wherein:
the add module 1021 may be used to: adding a cyclic prefix of a first length to the OFDM symbol; and outputs the OFDM symbol to which the cyclic prefix is added to the windowing module 1023.
For example, as shown in FIG. 10, the first length may be equal to (N)CP+N2). In practical applications, the first length may also be equal to NCPPlus N2Integer multiples of, e.g. (N)CP+2N2) The first length may also be other values, and is not limited herein.
Windowing module 1023 may be used to: utilizing a preset windowing function (e.g., P) for a header portion of the OFDM symboltypeIndicated windowing function), windowing the OFDM symbol at M sample points of the header portion; outputting the OFDM symbols after windowing to a calculation module 1025; and M is a positive integer.
For example, as shown in FIG. 10, the M may be equal to (N)1+N2). It should be noted that M may also be other values, such as (N), according to the actual application requirement1+2N2) And are not limiting herein.
The calculation module 1025 may be operable to: adding the OFDM symbols with X sampling points of the tail part of the previous OFDM symbol on X sampling points of the head part of the OFDM symbols after windowing; and outputting the added OFDM symbols. And X is a positive integer. Need to explainThe adding means adding X sampling points of the tail portion of one OFDM symbol in the time domain. For example, as shown in FIG. 10, X is equal to 2N2The physical meaning of the method can be known by referring to fig. 3, which means that the sampling point where the tail part of the last OFDM symbol overlaps with the OFDM symbol is added to the head part of the OFDM symbol.
Flag at the second Flag bittai1Equal to the second enable value (e.g., "1"), the adding module 1021 and the windowing module 1023 can also be used together to perform pulse shaping processing on the tail of the OFDM symbol of the output signal of the inverse fourier transform module 103. Wherein:
the add module 1021 may be used to: adding a cyclic suffix of a second length to the OFDM symbol; and outputs the OFDM symbol with the cyclic suffix added to the windowing module 1023.
For example, as shown in FIG. 10, the second length may be equal to N2. In practical applications, the second length may also be equal to NCPPlus N2Integer multiples of, e.g. (N)CP+2N2) The second length may also be other values, and is not limited herein.
Windowing module 1023 may be used to: utilizing a predetermined windowing function (e.g., P) for tail portions of the OFDM symbols output by add module 1021typeIndicated windowing function), windowing the OFDM symbol at N sampling points of the tail portion; outputting the OFDM symbols after windowing; and N is a positive integer.
For example, as shown in FIG. 10, the N may be equal to (N)1+N2). It should be noted that N may be other values, such as (N), according to the actual application requirement1+2N2) And are not limiting herein.
In addition, the memory module 1029 in the transmitter 10 shown in fig. 10 can be used for: and storing the Y sampling points of the tail part of the OFDM symbol after windowing into a storage medium. In a specific implementation, Y may be equal to X, i.e. X sample points of the tail portion of the last OFDM symbol may be stored in the storage medium. In practical applications, Y may also be larger than X, which is not limited herein.
In 5G and future communication scenarios, Time Division multiplexing (TDD) technology needs to perform uplink and downlink switching more frequently, and a switching period is usually less than 1 millisecond. When switching between uplink and downlink, signals may leak in time domain due to asynchronism of the system, causing mutual interference between uplink and downlink. By implementing the pulse forming processing at the tail part of the last symbol of the uplink frame or the pulse forming processing at the head part of the first symbol of the downlink frame, smooth switching of the uplink and downlink data frames can be realized, and uplink and downlink interference can be improved.
In another implementation of an embodiment of the present invention, the transmitter 10 may be as shown in fig. 10. Wherein: the inverse fourier transform module 103, the parallel-to-serial conversion (P/S) module 104, and the pulse shaping controller 101 are the same as those in the embodiment of fig. 9, and are not described again; the pulse shaping filter 102 may include, as shown in fig. 10: a multi-phase register network for: according to the length K and the shape P of the pulse to be configuredtypeAnd the determined filter coefficient at the transmitting end performs subcarrier-level filtering on the output signal of the inverse fourier transform module 103, and outputs a plurality of filtered subcarriers to the parallel-serial conversion module 104.
Specifically, as shown in fig. 10, the depth of the multiphase register network is consistent with the length K. A set of said lengths K and PtypeThe transmit side filter coefficient g can be determinedtx. The input received by the multi-phase register network shown in fig. 10 is the n-way signal of the output of the inverse fourier transform module 103.
In yet another implementation manner of the embodiment of the present invention, the transmitter 10 may include: the pulse shaping filter in the embodiment of fig. 10 and the pulse shaping filter in the embodiment of fig. 11 are both connected to the pulse shaping controller 101 and the inverse fourier transform module 103.
In a possible implementation, the pulse shaping filter in the embodiment corresponding to each of fig. 10 and 11 may be two hardware modules, which are independently integrated in the transmitter 10 and are connected to the pulse shaping controller respectively; in practical applications, the two hardware modules may also be integrated in the pulse shaping controller as a part of the pulse shaping controller, and the layout manner of the two hardware modules on the hardware architecture is not limited in the embodiment of the present invention.
In another possible implementation manner, the pulse shaping filter in the embodiment corresponding to fig. 10 and fig. 11 may be two software modules, and the two software modules may run in the pulse shaping controller or on another processing chip capable of communicating with the pulse shaping controller, and the embodiment of the present invention does not limit the operating environment of the two software modules.
In the still another implementation, the pulse forming controller 101 is further operable to: judging whether the length K is larger than a preset value (such as 2), if so, outputting the pulse parameter to a pulse shaping filter in the embodiment of fig. 10 to trigger the pulse shaping filter in the embodiment of fig. 10 to perform pulse shaping processing on the transmission signal; if the pulse parameter is less than or equal to the pulse parameter, the pulse parameter is output to the pulse shaping filter in the embodiment of fig. 10 to trigger the pulse shaping filter in the embodiment of fig. 10 to perform pulse shaping processing on the transmission signal.
It will be appreciated that the pulse parameters used in the embodiment of FIG. 10 may be a subset of the predetermined set of parameters shown in FIG. 1, i.e., N1、N2、Flaghead、Flagtail}; the pulse parameters used in the embodiment of FIG. 10 may be another subset of the preset parameter set shown in FIG. 1, namely { K, P }type}。
In this embodiment of the present invention, the pulse configuration signaling received by the pulse forming controller 101 may be a signaling sent by an upper layer, for example, a Radio Resource Control (RRC) layer. In practical application, the pulse configuration signaling may also be issued by the application layer to the pulse forming controller 101 in response to a user operation. The embodiments of the present invention are not limited with respect to the source and generation of the pulse configuration signaling.
Fig. 12 is a schematic diagram of an architecture of a receiver according to an embodiment of the present invention. As shown in fig. 12, the receiver 20 may include: a serial-to-parallel conversion (S/P) module 204, a pulse shaping filter 202, a pulse shaping controller 201, and a Fourier transform module 203, wherein:
the S/P module 204 may be configured to: the serially input transmission signals are output to the pulse shaping filter 202 in parallel;
the pulse forming controller 201 may be used to: receiving a pulse configuration signaling, generating a pulse parameter corresponding to a pulse to be configured according to the pulse configuration signaling, and outputting the pulse parameter to a pulse shaping filter 202;
the pulse shaping filter 202 may be used to: performing subcarrier level filtering on the output signal of the S/P module 204, performing pulse shaping processing on the output signal of the S/P module 204 according to the pulse parameter, and outputting the processed signal to the fourier transform module 203;
the fourier transform module 203 may be operable to: and carrying out Fourier transform on the signal processed by the pulse shaping filter.
It should be noted that fig. 12 only shows a part of the architecture of the receiver 20, and in practical applications, the receiver 20 may further include other modules for signal demodulation and signal reception, which are not described herein again.
In the embodiment of the present invention, the pulse parameters output by the pulse shaping controller 201 to the pulse shaping filter 202 may be all or part of a preset parameter set. Specifically, the preset parameter set may refer to table 1 and related descriptions in the embodiment of fig. 2, and details are not repeated here.
The following describes a specific implementation of the receiver 20 according to the embodiment of the present invention in detail with reference to fig. 13 and 14. Wherein: the receiver 20 of fig. 13 is preferably used in scenarios where the length of the pulse shape is small (e.g., said K ≦ 2), and the receiver 20 of fig. 14 is preferably used in scenarios where the length of the pulse shape is large (e.g., said K > 2).
In one implementation of an embodiment of the present invention, the receiver 20 may be as shown in fig. 13. Wherein: the serial-to-parallel conversion (S/P) module 204, the pulse shaping controller 201, and the fourier transform module 203 are the same as those in the embodiment of fig. 12, and are not described again; the pulse shaping filter 202 may further include, as shown in fig. 13: a calculation module 2021, a windowing module 2023, a removal module 2025, and a storage module 2027.
Flag at the first Flag bitheadEqual to the first enable value (e.g., "1"), the calculating module 2021, the windowing module 2023, and the removing module 2025 may be jointly used to perform pulse shaping processing on the head of the OFDM symbol corresponding to the output signal of the S/P module 204. Wherein:
the calculation module 2021 may be configured to: for the head part of the OFDM symbol, subtracting the OFDM symbol by using X sampling points of the tail part of the previous OFDM symbol on X sampling points of the head part; and outputs the subtracted OFDM symbols to windowing module 2023. Wherein X is a positive integer. It should be noted that, the subtracting refers to subtracting X sampling points of the tail portion of the previous OFDM symbol in the time domain. For example, as shown in FIG. 13, the Y may be equal to 2N2The physical meaning of the method can be known by referring to fig. 3, which means that the sampling point where the tail part of the last OFDM symbol overlaps with the OFDM symbol is subtracted from the head part of the OFDM symbol.
The windowing module 2023 may be used to: aiming at the head part of the OFDM symbol after subtraction, performing windowing processing on the OFDM symbol on M sampling points of the head part by utilizing the first half part of a preset windowing function; and outputs the windowed OFDM symbol to the removal module 2025; and M is a positive integer.
For example, as shown in FIG. 13, the M may be equal to (N)1+N2). It should be noted that M may also be other values, such as (N), according to the actual application requirement1+2N2) And are not limiting herein.
The removal module 2025 may be used to: removing a cyclic prefix of a first length for the OFDM symbol after windowing; and outputting the OFDM symbols after the cyclic prefix is removed.
For example, as shown in FIG. 13, the first lengthDegree may be equal to (N)CP+N2). In practical applications, the first length may also be equal to NCPPlus N2Integer multiples of, e.g. (N)CP+2N2) The first length may also be other values, and is not limited herein.
Flag at the second Flag bittailEqual to the second enable value (e.g., "1"), the windowing module 2023 and the removal module 2025 may be jointly used to perform pulse shaping on the tail of the OFDM symbol corresponding to the output signal of the S/P module 204. Wherein:
the windowing module 2023 may be used to: aiming at the tail part of the OFDM symbol, windowing the OFDM symbol on N sampling points of the tail part by utilizing the rear half part of a preset windowing function; outputting the OFDM symbols after windowing to the removal module; and N is a positive integer.
For example, as shown in FIG. 13, the N may be equal to (N)1+N2). It should be noted that N may be other values, such as (N), according to the actual application requirement1+2N2) And are not limiting herein.
The removal module 2025 may be used to: removing a cyclic suffix of a second length for the windowed OFDM symbol; and outputting the OFDM symbol with the cyclic suffix removed.
For example, as shown in FIG. 13, the second length may be equal to N2. In practical applications, the second length may also be equal to NCPPlus N2Integer multiples of, e.g. (N)CP+2N2) The second length may also be other values, and is not limited herein.
In addition, the storage module 2027 in the receiver 20 shown in fig. 13 may be configured to: storing Y sampling points of the tail part of the OFDM symbol corresponding to the output signal of the S/P module 204 into a storage medium; and Y is a positive integer. In a specific implementation, Y may be equal to X, i.e. X sample points of the tail portion of the last OFDM symbol may be stored in the storage medium. In practical applications, Y may also be larger than X, which is not limited herein.
In another implementation of an embodiment of the present invention, the receiver 20 may be as shown in fig. 14. Wherein: the serial-to-parallel conversion (S/P) module 204, the pulse shaping controller 201, and the fourier transform module 203 are the same as those in the embodiment of fig. 5, and are not described again; the pulse shaping filter 202 may include, as shown in fig. 14: a multi-phase register network for: according to the length K and the shape P of the pulse to be configuredtypeThe determined filter coefficient at the receiving end performs subcarrier-level filtering on the output signal of the S/P module 204, and outputs a plurality of subcarriers after filtering to the fourier transform module 203.
Specifically, as shown in fig. 14, the depth of the multiphase register network is consistent with the length K. A set of said lengths K and PtypeThe transmit-side filter coefficient gamma can be determinedrx. The input received by the multi-phase register network shown in fig. 14 is the n-way signal output by the S/P block 204.
In yet another implementation manner of the embodiment of the present invention, the receiver 20 may include: the pulse shaping filter in the embodiment of fig. 13 and the pulse shaping filter in the embodiment of fig. 14 are both connected to the pulse shaping controller 201 and the inverse fourier transform module 203.
In a possible implementation, the pulse shaping filter in the embodiment corresponding to each of fig. 13 and 14 may be two hardware modules, which are independently integrated in the transmitter 10 and are connected to the pulse shaping controller; in practical applications, the two hardware modules may also be integrated in the pulse shaping controller as a part of the pulse shaping controller, and the layout manner of the two hardware modules on the hardware architecture is not limited in the embodiment of the present invention.
In another possible implementation manner, the pulse shaping filter in the embodiment corresponding to fig. 13 and fig. 14 may be two software modules, and the two software modules may run in the pulse shaping controller or on another processing chip capable of communicating with the pulse shaping controller, and the embodiment of the present invention does not limit the operating environment of the two software modules.
In the still another implementation, the pulse forming controller 101 is further operable to: judging whether the length K is larger than a preset value (such as 2), if so, outputting the pulse parameter to a pulse shaping filter in the embodiment of fig. 14 to trigger the pulse shaping filter in the embodiment of fig. 14 to perform pulse shaping processing on the transmission signal; if the pulse parameter is less than or equal to the pulse parameter, the pulse parameter is output to the pulse shaping filter in the embodiment of fig. 13 to trigger the pulse shaping filter in the embodiment of fig. 13 to transmit a signal for pulse shaping processing.
It will be appreciated that the pulse parameters used in the embodiment of FIG. 13 may be a subset of the predetermined set of parameters shown in FIG. 1, i.e., N1、N2、Flaghead、Flagtail}; the pulse parameters used in the embodiment of FIG. 14 may be another subset of the preset parameter set shown in Table 1, namely { K, P }type}。
With regard to the source and generation manner of the pulse configuration signaling received by the pulse shaping controller 201, reference may be made to the related description in the embodiment of the transmitter 10, and the embodiment of the present invention is not limited thereto.
In addition, an embodiment of the present invention further provides a communication system, where the communication system includes: base station and terminal equipment, wherein:
the base station may be the base station 70 described in the embodiment corresponding to fig. 7, or may also be the base station described in the embodiment of the method in fig. 5, and for the function and implementation of the base station, specific reference may be made to the content of the embodiment of the method in fig. 5, which is not described herein again;
the terminal device may be the terminal device 80 described in the embodiment corresponding to fig. 8, or may be the terminal device station described in the embodiment of the method in fig. 5, and details about the function and implementation of the terminal device may specifically refer to the contents of the embodiment of the method in fig. 5, which are not described here again.
In summary, by implementing the filter optimization method provided by the embodiment of the present invention, a preferred receiving filter coefficient or a preferred transmitting filter coefficient is obtained by maximizing the receiving end signal-to-interference-and-noise ratio, and a known window function is used to approximate the preferred receiving filter coefficient or the preferred transmitting filter coefficient, so that the signal-to-interference-and-noise ratio can be improved, and the demodulation performance can be improved; by implementing the filter configuration method provided by the embodiment of the invention, under the preset communication scene needing pulse forming processing, the filter of the transmitting end and/or the receiving end is configured through the pulse parameters of the pulse to be configured, so that the communication performance of the whole communication system can be improved, such as reducing out-of-band power leakage, improving signal-to-interference-and-noise ratio, reducing interference and the like.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
While the invention has been described with reference to a number of embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (43)

1. A method for filter optimization, comprising:
determining the coefficient of the transmitting filter meeting the leakage ratio requirement of the target adjacent channel according to the leakage ratio requirement of the target adjacent channel
Figure FDA0002683333310000011
Said meeting said target adjacent channel leakage ratio requirement
Figure FDA0002683333310000012
Filter coefficients corresponding to a current communication scenario;
according to the channel statistical property H and meeting the targetRequired adjacent channel leakage ratio
Figure FDA0002683333310000013
Calculating the SINR of the receiving endRXMaximum preferred receive filter coefficient
Figure FDA0002683333310000014
Wherein, the channel statistical characteristics, the transmission filter coefficient gTX(t), and reception filter coefficient γRX(t) determining the SINR of the receiving endRXA variable of (d);
approximating the preferred receive filter coefficients using a known window function
Figure FDA0002683333310000015
Obtaining the preferred receive filter coefficients
Figure FDA0002683333310000016
Approximate receive filter coefficients
Figure FDA0002683333310000017
The above-mentioned
Figure FDA0002683333310000018
For configuring the receive-side filter.
2. The method of claim 1, wherein the target adjacent channel leakage ratio is satisfied based on channel statistical property H
Figure FDA0002683333310000019
Calculating the SINR of the receiving endRXMaximum preferred receive filter coefficient
Figure FDA00026833333100000110
The method comprises the following steps:
obtained by the following algorithmMake receiving end SINRRXMaximum preferred receive filter coefficient
Figure FDA00026833333100000111
Figure FDA00026833333100000112
Wherein, gTX(t) is equal to
Figure FDA00026833333100000113
3. The method of claim 1 or 2, further comprising:
according to said channel statistical property H and said
Figure FDA00026833333100000114
Calculating the SINR of the sending endTXMaximum preferred transmit filter coefficient
Figure FDA00026833333100000115
Wherein the channel statistical characteristics, the transmit filter coefficients gTX(t), and the reception filter coefficient γRX(t) determining the SINR of the transmitting endTXA variable of (d);
approximating the preferred transmit filter coefficients using a known window function
Figure FDA00026833333100000116
Obtaining the optimal transmit filter coefficients
Figure FDA00026833333100000117
Approximate transmit filter
Figure FDA00026833333100000118
The above-mentioned
Figure FDA00026833333100000119
For configuring the transmit-side filter.
4. The method of claim 3, wherein said determining is based on said channel statistical property H and said channel statistical property H
Figure FDA0002683333310000021
Calculating the SINR of the sending endTXMaximum preferred transmit filter coefficient
Figure FDA0002683333310000022
The method comprises the following steps:
the SINR of the sending end is obtained by the following algorithmTXMaximum preferred transmit filter coefficient
Figure FDA0002683333310000023
Figure FDA0002683333310000024
Wherein, γRX(t) is equal to
Figure FDA0002683333310000025
5. Method according to any of claims 1, 2, 4, wherein said obtaining and said preferring receive filter coefficients
Figure FDA0002683333310000026
Approximate receive filter coefficients
Figure FDA0002683333310000027
Then, the method further comprises the following steps:
progressive optimization of the transmit filter coefficients g by an iterative optimization processTX(t) andcoefficient gamma of receiving filterRX(t); wherein:
in round i +1, the preferred receive filter coefficients are calculated by the following algorithm
Figure FDA0002683333310000028
Figure FDA0002683333310000029
Wherein, gTX(t) is equal to
Figure FDA00026833333100000210
Is the transmit filter coefficient obtained and preferred in the ith round
Figure FDA00026833333100000211
The approximate transmit filter coefficients of the transmit filter coefficients,
Figure FDA00026833333100000212
is calculated in the ith round to ensure that the signal to interference plus noise ratio (SINR) of a transmitting endTXA maximum preferred transmit filter coefficient;
alternatively, in round i +1, the preferred transmit filter coefficients are calculated by the following algorithm
Figure FDA00026833333100000213
Figure FDA00026833333100000214
Wherein, γRX(t) is equal to
Figure FDA00026833333100000215
Figure FDA00026833333100000216
Is the reception filter coefficient obtained and preferred in the ith round
Figure FDA00026833333100000217
The approximate coefficients of the receive filter are,
Figure FDA00026833333100000218
is obtained by calculation in the ith round to ensure that the signal to interference plus noise ratio (SINR) of a receiving endRXA maximum preferred receive filter coefficient;
wherein i is a positive integer.
6. Method according to any of claims 1, 2, 4, characterized in that the reception filter coefficients gTX(t) the transmission filter coefficient γRX(t) are each characterized by a predefined pulse parameter;
the pulse parameters include: presetting all or part of a parameter set; the preset parameter set comprises: first FlagheadSecond FlagtailA first value N1A second value N2Pulse shape PtypeAnd the length K of the pulse to be configured relative to a single symbol period; wherein the first Flag bit FlagheadIs used for indicating whether the head part of the symbol is subjected to pulse forming or not, and the second Flag bit FlagtailIs used for indicating whether the tail part of the symbol is subjected to pulse forming or not, and the first numerical value N1The number of sampling points used for indicating pulse shaping in a single symbol and with amplitude weight not equal to 1, and the second value N2The number of sampling points used for indicating pulse forming outside a single symbol; the pulse shape PtypeFor indicating the shape of the pulse to be configured.
7. A filter configuration method, applied to a base station side, comprising:
if the current communication scene belongs to a preset communication scene needing pulse forming processing, the base station determines a pulse to be configured aiming at the current communication scene; the pulse to be configured is characterized by a set of pulse parameters; the pulse to be configured comprises a sending filter coefficient meeting the target adjacent channel leakage ratio requirement
Figure FDA0002683333310000031
And receive filter coefficients
Figure FDA0002683333310000032
The above-mentioned
Figure FDA0002683333310000033
And said
Figure FDA0002683333310000034
When obtained by a process as claimed in any one of the preceding claims 1 to 6;
receiving configuration information sent by terminal equipment, wherein the configuration information is used for indicating pulse shapes supported by the terminal equipment;
if the configuration information indicates that the terminal equipment supports the pulse to be configured and the pulse forming processing needs to be carried out on the terminal equipment side, notifying the terminal equipment of the pulse parameter of the pulse to be configured; the pulse parameters are used for configuring filter coefficients of the terminal equipment.
8. The method of claim 7, wherein the pulse shaping process required at the terminal device side comprises:
in the uplink transmission process, pulse modulation needs to be carried out at a sending end; or, in the downlink transmission process, pulse modulation needs to be performed at the receiving end;
the pulse parameters are used for configuring filter coefficients of the terminal equipment, and comprise:
in the uplink transmission process, the pulse parameters of the pulse to be configured are used for configuring a sending filter of the terminal equipment; or, in the downlink transmission process, the pulse parameter of the pulse to be configured is used for configuring a receiving filter of the terminal device.
9. The method of claim 7 or 8, further comprising: if the pulse forming processing is judged to be needed on the base station side, configuring a filter coefficient of the base station side according to the pulse parameter of the pulse to be configured; the pulse parameters are used to configure filter coefficients of the base station.
10. The method of claim 9, wherein the pulse shaping process required at the base station side comprises:
in the uplink transmission process, pulse modulation needs to be carried out at a receiving end; or, in the downlink transmission process, pulse modulation needs to be performed at the sending end;
the pulse parameters are used for configuring filter coefficients of the base station, and comprise:
in the uplink transmission process, the pulse parameters of the pulse to be configured are used for configuring the receiving filter coefficient of the base station; or, in the downlink transmission process, the pulse parameter of the pulse to be configured is used for configuring the sending filter coefficient of the base station.
11. The method of claim 8 or 10, wherein the determining that pulse modulation is required at a transmitting end comprises:
and judging whether pulse modulation needs to be carried out at a sending end according to at least one item of the service type of the transmission service, the preset requirement of the communication scene and the overhead of a guard band.
12. The method of claim 8 or 10, wherein the determining that pulse modulation is required at the receiving end comprises:
and judging whether the pulse modulation is needed at the receiving end according to at least one of the demodulation performance of the receiving end and the encoding and modulation orders of the signals.
13. The method according to any one of claims 7, 8 and 10, wherein the informing the terminal device of the pulse parameters of the pulse to be configured comprises:
notifying the pulse parameters to the terminal equipment by using dynamic signaling with a fixed period; alternatively, the first and second electrodes may be,
and informing the pulse parameters to the terminal equipment by utilizing real-time dynamic signaling.
14. The method of claim 13, wherein the signaling carries pulse parameters for the pulse to be configured; or, the signaling carries the indication information of the pulse to be configured.
15. The method according to any one of claims 7, 8, 10 and 14, wherein the preset communication scenario requiring pulse shaping processing comprises at least one of:
the current communication scene belongs to a preset scene needing to limit out-of-band power leakage, the terminal equipment is scheduled at the edge of a resource where different OFDM setting parameters coexist, the terminal equipment adopts a high-order modulation or high-order modulation coding strategy, the time-frequency fading currently corresponding to the terminal equipment reaches a preset degree, the resource position corresponding to the terminal equipment is positioned at the frame head and/or the frame tail of a data frame, and the physical channel currently positioned by the terminal equipment is a preset physical channel needing pulse forming; the OFDM setting parameters comprise cyclic prefix length and subcarrier width.
16. The method of any of claims 7, 8, 10, 14, wherein the pulse parameters comprise: presetting all or part of a parameter set; the preset parameter set comprises: first FlagheadSecond FlagtailA first value N1A second value N2Pulse shape PtypeAnd a length K of the pulse to be configured relative to a single symbol period; wherein the first Flag bit FlagheadIs used for indicating whether the head part of the symbol is subjected to pulse forming or not, and the second Flag bit FlagtailIs used for indicating whether the tail part of the symbol is subjected to pulse forming or not, and the first numerical value N1The number of sampling points used for indicating pulse shaping in a single symbol and with amplitude weight not equal to 1, and the second value N2For indicating a single symbolThe number of sampling points for external pulse forming, the pulse shape PtypeFor indicating the shape of the pulse to be configured.
17. A filter configuration method is applied to a terminal device side, and comprises the following steps:
sending configuration information to a base station, wherein the configuration information is used for indicating the pulse shape supported by the terminal equipment; receiving a pulse parameter of a pulse to be configured, which is notified by a base station; the pulse to be configured comprises a sending filter coefficient meeting the target adjacent channel leakage ratio requirement
Figure FDA0002683333310000051
And receive filter coefficients
Figure FDA0002683333310000052
The above-mentioned
Figure FDA0002683333310000053
And said
Figure FDA0002683333310000054
When obtained by a process as claimed in any one of the preceding claims 1 to 6; and configuring the filter coefficient according to the pulse parameter of the pulse to be configured.
18. The method of claim 17, wherein the receiving the pulse parameters of the pulse to be configured, notified by the base station, comprises:
receiving a dynamic signaling with a fixed period sent by a base station, wherein the dynamic signaling with the fixed period is used for notifying a pulse parameter of the pulse to be configured; alternatively, the first and second electrodes may be,
and receiving a real-time dynamic signaling sent by a base station, wherein the real-time dynamic signaling is used for informing the pulse parameters of the pulse to be configured.
19. The method of claim 18, wherein the signaling carries pulse parameters for the pulse to be configured; or, the signaling carries the indication information of the pulse to be configured.
20. The method according to any of claims 17-19, wherein the pulse shape supported by the terminal device is used to indicate whether the terminal device supports the pulse to be configured corresponding to the current communication scenario; the current communication scene belongs to a preset communication scene needing pulse forming processing.
21. The method of claim 20, wherein the predetermined communication scenario requiring pulse shaping processing comprises at least one of:
the current communication scene belongs to a preset scene needing to limit out-of-band power leakage, the terminal equipment is scheduled at the edge of a resource where different OFDM setting parameters coexist, the terminal equipment adopts a high-order modulation or high-order modulation coding strategy, the time-frequency fading currently corresponding to the terminal equipment reaches a preset degree, the resource position corresponding to the terminal equipment is positioned at the frame head and/or the frame tail of a data frame, and the physical channel currently positioned by the terminal equipment is a preset physical channel needing pulse forming; the OFDM setting parameters comprise cyclic prefix length and subcarrier width.
22. A communication network device, comprising:
a determining unit for determining the coefficient of the transmitting filter meeting the target adjacent channel leakage ratio requirement according to the target adjacent channel leakage ratio requirement
Figure FDA0002683333310000061
Said meeting said target adjacent channel leakage ratio requirement
Figure FDA0002683333310000062
Filter coefficients corresponding to a current communication scenario;
a first computing unit for computing the data according to the informationStatistical characteristic H and method for satisfying target adjacent channel leakage ratio requirement
Figure FDA0002683333310000063
Calculating the SINR of the receiving endRXMaximum preferred receive filter coefficient
Figure FDA0002683333310000064
Wherein, the channel statistical characteristics, the transmission filter coefficient gTX(t), and reception filter coefficient γRX(t) determining the SINR of the receiving endRXA variable of (d);
a first approximation unit for approximating the preferred receive filter coefficients using a known window function
Figure FDA0002683333310000065
Obtaining the preferred receive filter coefficients
Figure FDA0002683333310000066
Approximate receive filter coefficients
Figure FDA0002683333310000067
The above-mentioned
Figure FDA0002683333310000068
For configuring the receive-side filter.
23. The device of claim 22, wherein the first computing unit is specifically configured to:
the SINR of the receiving end is obtained by the following algorithmRXMaximum preferred receive filter coefficient
Figure FDA0002683333310000071
Figure FDA0002683333310000072
Wherein, gTX(t) is equal to
Figure FDA0002683333310000073
24. The apparatus of claim 22 or 23, further comprising:
a second calculation unit for calculating a channel statistic H based on the channel statistic and the channel statistic
Figure FDA0002683333310000074
Calculating the SINR of the sending endTXMaximum preferred transmit filter coefficient
Figure FDA0002683333310000075
Wherein the channel statistical characteristics, the transmission filter coefficients gTX(t), and the reception filter coefficient γRX(t) determining the SINR of the transmitting endTXA variable of (d);
a second approximation unit for approximating the preferred transmit filter coefficients using a known window function
Figure FDA0002683333310000076
Obtaining the optimal transmit filter coefficients
Figure FDA0002683333310000077
Approximate transmit filter
Figure FDA0002683333310000078
The above-mentioned
Figure FDA0002683333310000079
For configuring the transmit-side filter.
25. The device of claim 24, wherein the second computing unit is specifically configured to:
the SINR of the sending end is obtained by the following algorithmTXMaximum preferred transmit filter coefficient
Figure FDA00026833333100000710
Figure FDA00026833333100000711
Wherein, γRX(t) is equal to
Figure FDA00026833333100000712
26. The apparatus of any one of claims 22, 23, 25, further comprising: an iterative optimization unit to: progressive optimization of the transmit filter coefficients g by an iterative optimization processTX(t) and reception filter coefficient γRX(t); wherein:
in round i +1, the preferred receive filter coefficients are calculated by the following algorithm
Figure FDA00026833333100000713
Figure FDA00026833333100000714
Wherein, gTX(t) is equal to
Figure FDA00026833333100000715
Is the transmit filter coefficient obtained and preferred in the ith round
Figure FDA0002683333310000081
The approximate transmit filter coefficients of the transmit filter coefficients,
Figure FDA0002683333310000082
is calculated in the ith round to ensure that the signal to interference plus noise ratio (SINR) of a transmitting endTXLargest sizePreferred transmit filter coefficients;
alternatively, in round i +1, the preferred transmit filter coefficients are calculated by the following algorithm
Figure FDA0002683333310000083
Figure FDA0002683333310000084
Wherein, γRX(t) is equal to
Figure FDA0002683333310000085
Figure FDA0002683333310000086
Is the reception filter coefficient obtained and preferred in the ith round
Figure FDA0002683333310000087
The approximate coefficients of the receive filter are,
Figure FDA0002683333310000088
is obtained by calculation in the ith round to ensure that the signal to interference plus noise ratio (SINR) of a receiving endRXA maximum preferred receive filter coefficient;
wherein i is a positive integer.
27. The apparatus of any of claims 22, 23, 25, wherein the receive filter coefficient gTX(t) the transmission filter coefficient γRX(t) are each characterized by a predefined pulse parameter;
the pulse parameters include: presetting all or part of a parameter set; the preset parameter set comprises: first FlagheadSecond FlagtailA first value N1A second value N2Pulse shape PtypeAnd the length K of the pulse to be configured relative to a single symbol period; wherein the first Flag bit FlagheadFor indicating whether the symbol head is pulsed or notMolding, the second Flag bit FlagtailIs used for indicating whether the tail part of the symbol is subjected to pulse forming or not, and the first numerical value N1The number of sampling points used for indicating pulse shaping in a single symbol and with amplitude weight not equal to 1, and the second value N2The number of sampling points used for indicating pulse forming outside a single symbol; the pulse shape PtypeFor indicating the shape of the pulse to be configured.
28. A base station, comprising:
the base station is used for determining a pulse to be configured aiming at the current communication scene if the current communication scene belongs to a preset communication scene needing pulse forming processing; the pulse to be configured is characterized by a set of pulse parameters; the pulse to be configured comprises a sending filter coefficient meeting the target adjacent channel leakage ratio requirement
Figure FDA0002683333310000089
And receive filter coefficients
Figure FDA00026833333100000810
The above-mentioned
Figure FDA00026833333100000811
And said
Figure FDA00026833333100000812
When obtained by a process as claimed in any one of the preceding claims 1 to 6;
the receiving unit is used for receiving configuration information sent by terminal equipment, and the configuration information is used for indicating the pulse shapes supported by the terminal equipment;
the judging unit is used for judging whether the terminal equipment supports the pulse to be configured or not according to the configuration information and judging whether pulse forming processing needs to be carried out on the terminal equipment side or not;
a notifying unit, configured to notify a pulse parameter of the pulse to be configured to the terminal device if the configuration information indicates that the terminal device supports the pulse to be configured and it is determined that pulse shaping processing needs to be performed on the terminal device side; the pulse parameters are used for configuring filter coefficients of the terminal equipment.
29. The base station of claim 28, wherein the pulse shaping process required at the terminal device side comprises:
in the uplink transmission process, pulse modulation needs to be carried out at a sending end; or, in the downlink transmission process, pulse modulation needs to be performed at the receiving end;
the pulse parameters are used for configuring filter coefficients of the terminal equipment, and comprise:
in the uplink transmission process, the pulse parameters of the pulse to be configured are used for configuring a sending filter of the terminal equipment; or, in the downlink transmission process, the pulse parameter of the pulse to be configured is used for configuring a receiving filter of the terminal device.
30. The base station of claim 28 or 29, further comprising: the configuration unit is used for configuring the filter coefficient of the base station side according to the pulse parameter of the pulse to be configured if the pulse forming processing needs to be carried out on the base station side; the pulse parameters are used to configure filter coefficients of the base station.
31. The base station of claim 30, wherein said processing requiring pulse shaping at the base station side comprises:
in the uplink transmission process, pulse modulation needs to be carried out at a receiving end; or, in the downlink transmission process, pulse modulation needs to be performed at the sending end;
the pulse parameters are used for configuring filter coefficients of the base station, and comprise:
in the uplink transmission process, the pulse parameters of the pulse to be configured are used for configuring the receiving filter coefficient of the base station; or, in the downlink transmission process, the pulse parameter of the pulse to be configured is used for configuring the sending filter coefficient of the base station.
32. The base station of claim 29 or 31, wherein the determining module is specifically configured to: and judging whether pulse modulation needs to be carried out at a sending end according to at least one item of the service type of the transmission service, the preset requirement of the communication scene and the overhead of a guard band.
33. The base station of claim 29 or 31, wherein the determining module is specifically configured to: and judging whether the pulse modulation is needed at the receiving end according to at least one of the demodulation performance of the receiving end and the encoding and modulation orders of the signals.
34. The base station according to any of claims 28, 29, and 31, wherein the notifying unit is specifically configured to:
notifying the pulse parameters to the terminal equipment by using dynamic signaling with a fixed period; alternatively, the first and second electrodes may be,
and informing the pulse parameters to the terminal equipment by utilizing real-time dynamic signaling.
35. The base station of claim 34, wherein the signaling carries pulse parameters of the pulse to be configured; or, the signaling carries the indication information of the pulse to be configured.
36. The base station according to any of claims 28, 29, 31, 35, wherein the preset communication scenario requiring pulse shaping processing comprises at least one of:
the current communication scene belongs to a preset scene needing to limit out-of-band power leakage, the terminal equipment is scheduled at the edge of a resource where different OFDM setting parameters coexist, the terminal equipment adopts a high-order modulation or high-order modulation coding strategy, the time-frequency fading currently corresponding to the terminal equipment reaches a preset degree, the resource position corresponding to the terminal equipment is positioned at the frame head and/or the frame tail of a data frame, and the physical channel currently positioned by the terminal equipment is a preset physical channel needing pulse forming; the OFDM setting parameters comprise cyclic prefix length and subcarrier width.
37. The base station of any of claims 28, 29, 31, 35, wherein the pulse parameters comprise: presetting all or part of a parameter set; the preset parameter set comprises: first FlagheadSecond FlagtailA first value N1A second value N2Pulse shape PtypeAnd a length K of the pulse to be configured relative to a single symbol period; wherein the first Flag bit FlagheadIs used for indicating whether the head part of the symbol is subjected to pulse forming or not, and the second Flag bit FlagtailIs used for indicating whether the tail part of the symbol is subjected to pulse forming or not, and the first numerical value N1The number of sampling points used for indicating pulse shaping in a single symbol and with amplitude weight not equal to 1, and the second value N2The number of sampling points for indicating pulse shaping outside a single symbol, the pulse shape PtypeFor indicating the shape of the pulse to be configured.
38. A terminal device, comprising:
a sending unit, configured to send configuration information to a base station, where the configuration information is used to indicate a pulse shape supported by a terminal device;
a receiving unit, configured to receive a pulse parameter of a pulse to be configured, which is notified by a base station; the pulse to be configured comprises a sending filter coefficient meeting the target adjacent channel leakage ratio requirement
Figure FDA0002683333310000111
And receive filter coefficients
Figure FDA0002683333310000112
The above-mentioned
Figure FDA0002683333310000113
And said
Figure FDA0002683333310000114
When obtained by a process as claimed in any one of the preceding claims 1 to 6;
and the configuration unit is used for configuring the filter coefficient according to the pulse parameter of the pulse to be configured.
39. The terminal device of claim 38, wherein the receiving unit is specifically configured to:
receiving a dynamic signaling with a fixed period sent by a base station, wherein the dynamic signaling with the fixed period is used for notifying a pulse parameter of the pulse to be configured; alternatively, the first and second electrodes may be,
and receiving a real-time dynamic signaling sent by a base station, wherein the real-time dynamic signaling is used for informing the pulse parameters of the pulse to be configured.
40. The terminal device of claim 39, wherein the signaling carries pulse parameters of the pulse to be configured; or, the signaling carries the indication information of the pulse to be configured.
41. The terminal device according to any of claims 38-40, wherein the pulse shape supported by the terminal device is used to indicate whether the terminal device supports the pulse to be configured corresponding to the current communication scenario; the current communication scene belongs to a preset communication scene needing pulse forming processing.
42. The terminal device of claim 41, wherein the preset communication scenario requiring pulse shaping processing comprises at least one of:
the current communication scene belongs to a preset scene needing to limit out-of-band power leakage, the terminal equipment is scheduled at the edge of a resource where different OFDM setting parameters coexist, the terminal equipment adopts a high-order modulation or high-order modulation coding strategy, the time-frequency fading currently corresponding to the terminal equipment reaches a preset degree, the resource position corresponding to the terminal equipment is positioned at the frame head and/or the frame tail of a data frame, and the physical channel currently positioned by the terminal equipment is a preset physical channel needing pulse forming; the OFDM setting parameters comprise cyclic prefix length and subcarrier width.
43. A communication system, comprising: base station and terminal equipment, wherein:
the base station is the base station of any one of claims 28-37;
the terminal device is the terminal device of any one of claims 38-42.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102957653A (en) * 2011-08-23 2013-03-06 中兴通讯股份有限公司 Method and device for reducing frequency spectrum leakage
WO2014117135A2 (en) * 2013-01-28 2014-07-31 Interdigital Patent Holdings, Inc. Methods and apparatus for spectrum coordination
CN204733135U (en) * 2015-05-05 2015-10-28 上海卓悠网络科技有限公司 A kind of TD-LTE filter circuit of mobile terminal
CA2950160A1 (en) * 2014-06-25 2015-12-30 Qualcomm Incorporated Full duplex operation in a wireless communication network

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7394862B2 (en) * 2004-12-21 2008-07-01 Broadcom Corporation Multi-mode wireless polar transmitter architecture
CN100452652C (en) * 2006-02-21 2009-01-14 上海无线通信研究中心 Bi-orthogonal filter design method and its design device
TWM346223U (en) * 2007-08-06 2008-12-01 Interdigital Patent Holdings Pulse shaping for EGPRS-2
EP2645653B1 (en) * 2012-03-30 2016-03-30 NTT DoCoMo, Inc. Transmission filter calculator, communication device and methods
CN104954051A (en) * 2014-03-31 2015-09-30 富士通株式会社 Pulse shaping filter optimization device, transmitter and method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102957653A (en) * 2011-08-23 2013-03-06 中兴通讯股份有限公司 Method and device for reducing frequency spectrum leakage
WO2014117135A2 (en) * 2013-01-28 2014-07-31 Interdigital Patent Holdings, Inc. Methods and apparatus for spectrum coordination
CA2950160A1 (en) * 2014-06-25 2015-12-30 Qualcomm Incorporated Full duplex operation in a wireless communication network
CN204733135U (en) * 2015-05-05 2015-10-28 上海卓悠网络科技有限公司 A kind of TD-LTE filter circuit of mobile terminal

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"Radio communication Study Groups";detraz;《3GPP》;20120617;全文 *

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