WO2015039336A1

WO2015039336A1 - Data transmitting and receiving method and device

Info

Publication number: WO2015039336A1
Application number: PCT/CN2013/083964
Authority: WO
Inventors: 陈亮; 肖洁华; 臧秀刚
Original assignee: 华为技术有限公司
Priority date: 2013-09-23
Filing date: 2013-09-23
Publication date: 2015-03-26
Also published as: CN104662854A; CN104662854B

Abstract

Provided in an embodiment of the present invention is a data transmitting method, comprising: changing the symbol length of valid data in a symbol to be processed to enable the prime number base of the changed symbol length of the valid data to be 2 and/or 3 and/or 5, the difference between the changed symbol length of the symbol to be processed and the unchanged symbol length of the symbol to be processed being minimum; conducting an inverse fast Fourier transform (IFFT) on the changed valid data; changing the lengths of a cyclic prefix (CP) and/or a guard period (GP), such that the changed symbol length of the CP is not less than the unchanged symbol length of the CP, and the changed symbol length of the symbol to be processed is the unchanged symbol length of the symbol to be processed; forming the changed symbol to be processed into data via a forming filter, and transmitting the data to a user equipment (UE), thus facilitating IFFT change; in addition, the prime number base of FFT/IFFT in LTE is 2 or 3 or 5, thus realizing compatibility with LTE.

Description

TECHNICAL FIELD The present invention relates to the field of communications, and in particular, to a method and an apparatus for transmitting and receiving data. Background technique

The Third Generation Partnership Project (3GPP) has established a special topic called Signal Precoding Enhancements for EGPRS2 Downlink SPEED. Downstream refers to the base station transmitting signals to mobile terminals. The so-called precoding enhancement is Refers to the Orthogonal Frequency Division Multiplexing (OFDM) technology introduced in the GSM/EDGE wireless access part (GERAN), which adds a fast Fourier inverse to the base station and the user equipment. Inverse Fast Fourier Transform (IFFT) and Fast Fourier Transform (FFT) transform process. This special study introduces OFDM precoding into the existing Enhanced GPRS Phase 2 (EGPRS2) downlink service while keeping the length of the existing burst time unchanged, improving the receiver's non-ideal. The robustness of the factors reduces the complexity of the receiver and increases the system throughput. EGPRS2 is an enhancement to existing EGPRS and GPRS technologies, adding a higher modulation scheme and a higher symbol rate.

The basic burst (burst) structure of the traffic channel before the introduction of SPEED is as follows:

(TB Tail bis - ( GLad period)

The burst structure of SPEED is as follows:

6 26fll6=142 S25 ^ers t rate bust (h3⁄4 CP q

Ihe b&s Ta a ins^rbdls ..3⁄4"i^ 3⁄4.i-3⁄4"i3⁄4Q_ ₊ i■■■■■■ Bu 3⁄4s (?

8 31+138=169 1Q5 The Guard Period (GP) is used to protect the burst from interference from other bursts. Under normal symbol rate (NSR), the GP length is 8.25 symbols. Under High Symbol Rate (HSR), the GP length is 10.5 symbols. The specific modulation symbol of the GP is determined by the modulation mode. The modulation symbol refers to the symbol generated after modulation. For example, an burst of an NSR has 156.25 symbols.

The Fast Fourier Transformation (FFT) in the existing SPEED The length of the Inverse Fast Fourier Transform (IFFT) is the data symbol and the training sequence TS (training sequence) symbol in the burst. The sum of the numbers, as in the case of NSR, is 142, the prime number is 142=71*2, and the prime base is 2 and 71. The prime number of 71 is too large; the number of transform points under HSR is 169, and its prime number is decomposed to 169=13*13, 13 is also a large prime number. Larger prime bases will cause complex FFT/IFFT implementation, slow speed, etc. . Summary of the invention

An object of the embodiments of the present invention is to provide a method and an apparatus for transmitting and receiving data, which is to solve the problem of how to reduce the complexity of FFT/IFFT implementation without ensuring that the existing burst length is not changed and the existing time power template is satisfied. And the problem of compatibility with FFT/IFFT implementation in LTE technology.

A first aspect, a method for transmitting data, the method comprising:

Changing the symbol length of the valid data in the symbol to be processed such that the prime base of the symbol length of the changed valid data is 2 and/or 3 and/or 5, and the symbol length of the changed symbol to be processed and before the change The symbol lengths of the to-be-processed symbols are the smallest, the valid data symbols include the symbol length of the data Data symbol and the training sequence TS symbol, and the symbol length of the to-be-processed symbol includes a cyclic prefix CP, a data symbol, a TS symbol, and a guard interval GP. ;

Performing an inverse fast Fourier transform IFFT on the changed valid data;

Changing the length of the cyclic prefix CP and/or the guard interval GP such that the symbol length of the changed CP is not less than the symbol length of the CP before the change, and the symbol length of the changed symbol to be processed is the location before the change. The symbol length of the processed symbol;

The changed symbol to be processed is formed into data by a shaping filter, and the data is transmitted to the user equipment.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the change is to be processed The symbol length of valid data in the symbol, including:

In the case of NSR, the symbol length of the valid data is increased from 142 to 144;

In the case of HSR, the symbol length 169 of the valid data is reduced to 162.

In conjunction with the first aspect or the first possible implementation of the first aspect, in a second possible implementation manner of the first aspect, the method further includes:

The base station adds the indication information, and sends the indication information to the user equipment, so that the user equipment determines, according to the indication information, whether the base station changes the symbol length of the valid data in the to-be-processed symbol.

A second aspect is a method for receiving data, the method comprising:

Receiving data sent by the base station, and determining, according to the indication information sent by the base station, whether the base station changes a symbol length of valid data in the to-be-processed symbol;

If yes, calculate the symbol length of the changed valid data and the changed cyclic prefix CP, the guard interval GP symbol length;

And removing the cyclic prefix CP and the guard interval GP in the data according to the changed length of the CP and the GP symbol;

Performing a fast Fourier transform FFT transform on the removed data to obtain a data Data symbol in the valid data symbol, the valid data symbol including the data Data symbol and the training sequence TS symbol.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the method further includes: if not, maintaining a symbol length of the preset received valid data unchanged.

A third aspect, a base station, where the base station includes:

a first changing unit, configured to change a symbol length of valid data in the to-be-processed symbol, such that a prime number of the symbol length of the changed valid data is 2 and/or 3 and/or 5, and the changed pending The symbol length of the symbol and the symbol length of the to-be-processed symbol before the change are the smallest, the valid data symbol includes a symbol length of the data Data symbol and a training sequence TS symbol, and the symbol length of the to-be-processed symbol includes a cyclic prefix CP, a data symbol , TS symbol and guard interval GP;

a transform unit, configured to perform an inverse fast Fourier transform IFFT on the changed valid data, and a second changing unit, configured to change a length of the cyclic prefix CP and/or the guard interval GP, so that the changed The symbol length of the CP is not less than the symbol length of the CP before the change, and the symbol length of the changed symbol to be processed is the symbol length of the to-be-processed symbol before the change;

a sending unit, configured to form the changed symbol to be processed by a shaping filter, and The data is sent to the user equipment.

With reference to the third aspect, in a first possible implementation manner of the third aspect, performing, in the first changing unit, performing changing a symbol length of the valid data in the to-be-processed symbol includes:

In the case of HSR, the symbol length 169 of the valid data is reduced to 162.

With reference to the third aspect, or the first possible implementation manner of the third aspect, in a second possible implementation manner of the third aspect, the base station further includes an adding unit, where the adding unit is specifically configured to: add indication information Sending the indication information to the user equipment, so that the user equipment determines, according to the indication information, whether the base station changes the symbol length of the valid data in the to-be-processed symbol.

A user equipment, where the user equipment includes:

a receiving unit, configured to receive data sent by the base station;

a determining unit, configured to determine, according to the indication information sent by the base station, whether the base station changes a symbol length of valid data in the to-be-processed symbol;

Removing the unit, configured to remove the cyclic prefix CP and the guard interval GP in the data according to the changed length of the CP and GP symbols;

And an obtaining unit, configured to perform fast Fourier transform FFT transform on the removed data, and obtain data Data symbols in the valid data symbols, where the valid data symbols include the data Data symbol and the training sequence TS symbol.

With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, the user equipment further includes:

The holding unit is configured to keep the symbol length of the preset valid data received unchanged.

Compared with the prior art, the embodiment of the present invention provides a method for transmitting data, where the method determines the symbol length of the valid data in the symbol to be processed, so that the prime number of the symbol length of the changed valid data is 2 and / or 3 and / or 5, and the symbol length of the changed symbol to be processed and the symbol length of the symbol to be processed before the change are the smallest; performing inverse fast Fourier transform IFFT on the changed valid data; Changing the length of the cyclic prefix CP and/or the guard interval GP such that the symbol length of the changed CP is not less than the symbol length of the CP before the change, and the symbol length of the changed symbol to be processed is before the change. Determining the symbol length of the processed symbol; forming the changed symbol to be processed by the shaping filter, and transmitting the data to the user equipment, thereby implementing an IFFT change, and at the same time, because of FFT/IFFT in LTE The prime number is 2 or 3 or 5, so To achieve compatibility with LTE.

BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings to be used in the embodiments will be briefly described below. Obviously, the drawings in the following description are only some of the present invention. For the embodiments, those skilled in the art can obtain other drawings according to the drawings without any creative labor.

1 is an application scenario diagram provided by the prior art;

2 is a flow chart of data processing of a base station provided by the prior art;

3 is a data processing flowchart of a user equipment provided by the prior art;

4 is a flowchart of a method for transmitting data according to an embodiment of the present invention;

5 is a schematic diagram of comparison before and after burst modification in the case of NSR according to an embodiment of the present invention; FIG. 6 is a schematic diagram of comparison before and after burst modification in the case of HSR according to an embodiment of the present invention; FIG. 7 is an NSR according to an embodiment of the present invention. Schematic diagram of a time power template for the next 8PSK modulation;

FIG. 8 is a flowchart of a method for receiving data according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of comparison of effects of two types of sending data according to an embodiment of the present invention; FIG.

FIG. 10 is a structural diagram of a device of a base station according to an embodiment of the present invention;

FIG. 11 is a structural diagram of a device of a user equipment according to an embodiment of the present invention;

FIG. 12 is a structural diagram of a device of a base station according to an embodiment of the present invention;

FIG. 13 is a structural diagram of a device of a user equipment according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS In order to make the objects, technical solutions and advantages of the present invention more comprehensible, the present invention will be further described in detail below with reference to the accompanying drawings. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. Within the scope.

Referring to FIG. 1, FIG. 1 is an application scenario diagram provided by the prior art. As shown in Figure 1, the user equipment (User Equpiment, UE) and the base station perform data service transmission. The base station serves as a base station, and sends the songs, programs, and the like that the UE needs to download to the user equipment, and the user equipment serves as the user equipment, and receives the songs, programs, and the like sent by the base station.

Referring to FIG. 2, FIG. 2 is a flowchart of data processing of a base station provided by the prior art.

As shown in FIG. 2, the base station performs channel coding on the information data to form encoded data, and the base station performs channel coding on the information data to form encoded data, and further processes the encoded data to form a burst. The pre-symbol is formed by symbol mapping, and the prior art processes the symbols to be pre-processed, and then adds a Cyclic Prefix (CP), a guard interval (GP), and a pulse shaping to the pre-processed symbols. The transmission data is formed, and the transmission data is transmitted to the user equipment.

Referring to FIG. 3, FIG. 3 is a flowchart of data processing of a user equipment provided by the prior art.

As shown in FIG. 3, the user equipment receives data sent by the base station, performs filtering processing on the data, removes the GP of the data, removes the CP of the data, and performs inverse preprocessing on the data, The data is subjected to symbol demapping, burst analysis, and channel decoding to form information data.

Referring to FIG. 4, FIG. 4 is a flowchart of a method for transmitting data according to an embodiment of the present invention. As shown in FIG. 1, the method includes the following steps:

Step 401: Change a symbol length of valid data in the to-be-processed symbol, such that a prime number of the symbol length of the changed valid data is 2 and/or 3 and/or 5, and a symbol length of the changed symbol to be processed And the symbol length of the to-be-processed symbol before the change is the smallest, the valid data symbol includes a symbol length of the data Data symbol and a training sequence TS symbol, and the symbol length of the to-be-processed symbol includes a cyclic prefix CP, a data symbol, a TS symbol, and Protection interval GP;

Specifically, the added pre-processing symbol may be a repetition or encoding of the data symbol, or may be a training sequence TS (training sequence) symbol, which is represented as Data in FIG. 2. For example, if there are 116 data symbols and 26 training sequence symbols in the original 142 pre-processed symbols under the NSR, then the added 2 symbols can be 2 data symbols (ie, 118 data symbols and 26 transforms are added. Training sequence symbol), or 2 training sequence symbols (ie, increasing the post-transform 116 data symbols and 28 training sequence symbols). The added symbol to be processed may also be a combination of data symbols and training sequence symbols, taking into account the combined effects.

The added data symbol may be a repetition of the original data symbol, or may be a symbol encoded by the original data symbol. The so-called encoding refers to a transformation of the original data symbol, such as adding or subtracting several symbols. In order to reduce the loss of information data, the reduced symbol to be processed may be a training sequence symbol. For example, if the original 169 pre-processing symbols in the HSR contain 138 data symbols and 31 TS symbols, then the reduced 7 symbols can be TS symbols, that is, the reduced symbols to be processed are 138 data symbols and 24 TS symbols. The reduced symbol to be processed may also be a combination of data symbols and training sequence symbols, taking into account the combined effects.

Step 402: Perform an inverse fast Fourier transform (FFT) on the symbol to be processed after changing the symbol length. The symbol preprocessing in the SPEED base station is an inverse fast Fourier transform (IFFT) on the preprocessed symbol.

Optionally, the changing the symbol length of the valid data in the to-be-processed symbol includes:

In the case of HSR, the symbol length 169 of the valid data is reduced to 162.

Specifically, for example, the original base station IFFT transform data length is increased from 142 to 144 in the case of the normal symbol rate (NSR), or the IFFT transform data is obtained in the case of a high symbol rate (HSR). The length is reduced from 169 to 162 such that the length of the preprocessed symbol is 2, 3.

In this step, the length of the IFFT transform data is increased from 142 to 144, where 142=71*2, 144=2*2*2*2*3*3; the length of the IFFT transform data is reduced from 169 to 162, where 169=13*13, 162=2*3*3*3*3, so that the prime base of the IFFT transform data length after the change is 2, 3, thereby implementing the algorithm of the IFFT and improving the speed of the IFFT transform, and at the same time In the Long Term Evolution (LTE), the IFFT transform data length prime number is required to be 2, 3, and 5. Therefore, the length of the IFFT transform data in the SPEED is increased or decreased to be compatible with the LTE requirements.

Step 403, changing the length of the cyclic prefix CP and/or the guard interval GP, so that the length of the CP is not less than a preset CP length, and the symbol length of the CP, the GP, and the changed pending symbol is Set the symbol length;

Considering that the length of the CP affects the performance of symbol interference suppression for multipath channel delays, the CP length is generally not reduced.

Specifically, in the case of the NSR, after the adjustment of the step 401, the pre-processed symbol length of the base station is 144, and the six symbols of the pre-processed symbol tail are repeatedly placed as the CP in front of the pre-processed symbol. The length of the generated symbol is 150. The CP length maintains the original downlink precoding enhancement SPEED CP length 6 unchanged. In the case of the HSR, after the adjustment of the step 401, the FFT length of the pre-processed symbol of the base station is 162, and the 15 symbols of the pre-processed symbol tail are repeatedly placed as the CP in front of the pre-processed symbol, the symbol The length is 177. The length of the CP increases over the length of the CP of the original SPEED.

In this step, in the case of NSR, 6.25 GPs are added at the tail when the entire burst length is constant; in the case of HSR, 10.5 GPs are added at the tail of the pre-processed symbol.

As shown in FIG. 5, FIG. 5 is a comparison diagram before and after burst modification in the case of the NSR provided by the embodiment of the present invention. The length of the entire burst before modification is 156.25, the length of the GP symbol is 8.25, the length of the CP symbol is 6, the length of the preprocessed symbol is 142, and the length of the entire burst is 156.25, including the length of the reduced GP symbol. For 6.25, the length of the CP symbol remains unchanged at 6, and the length of the preprocessed symbol is 144.

As shown in FIG. 6, FIG. 6 is a comparison diagram before and after burst modification in the case of HSR according to an embodiment of the present invention. The length of the entire burst before modification is 187.5, the length of the GP symbol is 10.5, the length of the CP symbol is 8, the length of the preprocessed symbol is 169, and the length of the entire burst remains 187.5, and the length of the GP symbol is not maintained. It becomes 10.5, the length of the CP symbol is increased to 15, and the length of the preprocessed symbol is 162.

Step 404: Form the changed symbol to be processed by a shaping filter, and send the data to the user equipment.

Specifically, the CP, the changed symbol to be processed, the GP are formed into data by a shaping filter or the like. Wherein, the shaping filter suppresses signal power outside the band of the transmission signal, so that the signal power outside the band is very low, so that a new burst formed by shaping the filter does not affect the signal outside the band during transmission.

Referring to FIG. 7, FIG. 7 is a schematic diagram of a time power template for 8PSK modulation under NSR according to an embodiment of the present invention. As shown in FIG. 7, the time power template refers to a symbol in a burst, and the symbol power at both ends is gradually increased and decreased when transmitted. In order to ensure performance, the transmit power of the useful signal must satisfy a certain value.

As an optional embodiment, the method further includes:

The base station adds the indication information, and sends the indication information to the user equipment, so that the user equipment determines, according to the indication information, whether the base station changes the symbol length of the valid data in the to-be-processed symbol. The original method is a method other than the Signal Precoding Enhancements for EGPRS2 DL (SPEED) in the GERAN, such as a General Packet Radio Service (GPRS) or an Enhanced GPRS (Enhanced GPRS). EGPRS) and so on.

Embodiments of the present invention provide a method for transmitting data, by changing a symbol length of valid data in a symbol to be processed, so that a prime base of a symbol length of the changed valid data is 2 and/or 3 and/or 5 And the symbol length of the changed symbol to be processed and the symbol length of the symbol to be processed before the change are minimized; performing an inverse fast Fourier transform IFFT on the changed valid data; changing the cyclic prefix CP and / or the length of the guard interval GP, such that the symbol length of the changed CP is not less than the symbol length of the CP before the change, and the symbol length of the changed symbol to be processed is the symbol length of the to-be-processed symbol before the change And forming the changed symbol to be processed by a shaping filter, and transmitting the data to the user equipment, thereby implementing an IFFT change, and at the same time, because the prime base of the FFT/IFFT in LTE is 2 or 3 or 5, therefore, can be compatible with LTE.

Referring to FIG. 8, FIG. 8 is a flowchart of a method for receiving data according to an embodiment of the present invention. As shown in FIG. 8, the method includes the following steps:

Step 801: Receive data sent by the base station, and determine, according to the indication information sent by the base station, whether the base station changes a symbol length of valid data in the to-be-processed symbol.

Step 802, if yes, calculating the symbol length of the changed valid data and the changed cyclic prefix CP, the guard interval GP symbol length;

Step 803, removing the cyclic prefix CP and the guard interval GP in the data according to the changed length of the CP and the GP symbol;

Step 804: Perform fast Fourier transform FFT transform on the removed data to obtain data Data symbols in the valid data symbols, where the valid data symbols include the data Data symbol and the training sequence TS symbol.

Specifically, referring to FIG. 5, in the case of the NSR, 6.25 GP symbols of the data tail are removed; in the case of the NSR, the 6 CP symbols preceding the filtered data are removed to form a pre-processed symbol. .

Specifically, referring to FIG. 6, in the case of the HSR, 10.5 GP symbols of the data tail are removed. In the case of the HSR, the 15 CP symbols preceding the filtered data are removed to form a pre-processed symbol. In the case of NSR, the length of the pre-processed symbol is increased from the original 142 to 144, so that the FFT transform data length is 144. In the case of HSR, the length of the pre-processed symbol is reduced from the original 169 to 162, so that the FFT The length of the transformed data is 162, because 144=2*2*2*2*3*3, 162=2*3*3*3*3, so that the prime base of the FFT length after the change is 2, 3, thus The FFT algorithm implements and improves the speed of the FFT transform. At the same time, since the FFT length prime number is required to be 2, 3, and 5 in LTE, the FFT length in SPEED is increased or decreased to be compatible with LTE requirements.

As an optional embodiment, the method further includes:

If not, the symbol length of the received valid data held in advance is kept unchanged.

Referring to FIG. 9, FIG. 9 is a schematic diagram showing the effect of two types of data transmission according to an embodiment of the present invention. As shown in FIG. 9, the present invention improves the efficiency of the FFT algorithm while ensuring that the total length of the burst is constant, such as 144 to 142 times faster than the 142 FFT, and can satisfy the time template requirement, as shown in FIG. The power changes when the length is 144 and 142. Since the FFT transform length is changed from 142 to 144, it will occupy one symbol for each guard interval, so that the guard interval is changed from [Dl D2 GP1 GP2 GP3 GP4] to [D1' D2' GP1 GP2 GP3], and D2' still participates. Power suppression. Since the elevation of the front power and the power suppression at the rear in one burst are symmetrical, only the pattern of the lifted portion is shown here. The box in the figure indicates the case where the FFT/IFFT point is 142, and the circle corresponds to the case where the FFT/IFFT point is 144. It can be seen from the figure that the difference between the two is small, especially when the power attenuation is large, the two basically coincide.

Referring to FIG. 10, FIG. 10 is a structural diagram of a device of a base station according to an embodiment of the present invention. As shown in Figure 10, the device comprises the following units:

a first changing unit 1001, configured to change a symbol length of valid data in the to-be-processed symbol, such that a prime number of the symbol length of the changed valid data is 2 and/or 3 and/or 5, and the changed The symbol length of the to-be-processed symbol and the symbol length of the to-be-processed symbol before the change are the smallest, the valid data symbol includes a symbol length of the data Data symbol and a training sequence TS symbol, and the symbol length of the to-be-processed symbol includes a cyclic prefix CP, Data symbol, TS symbol and guard interval GP;

The added data symbol may be a repetition of the original data symbol, or a symbol encoded by the original data symbol. The so-called encoding refers to a transformation of the original data symbol, such as adding or subtracting several symbols.

In order to reduce the loss of information data, the reduced symbol to be processed may be a training sequence symbol. For example, if the original 169 pre-processing symbols in the HSR contain 138 data symbols and 31 TS symbols, then the reduced 7 symbols can be TS symbols, that is, the reduced symbols to be processed are 138 data symbols and 24 TS symbols. The reduced pending symbols can also be a combination of data symbols and training sequence symbols, taking into account the combined effects.

a transform unit 1002, configured to perform an inverse fast Fourier transform IFFT on the changed valid data; performing symbol preprocessing on the SPEED base station is performing an inverse fast Fourier transform (IRF) on the preprocessed symbol .

Optionally, performing, in the first changing unit 1001, changing a symbol length of valid data in the to-be-processed symbol includes:

In the case of HSR, the symbol length 169 of the valid data is reduced to 162.

Increase the length of the IFFT transform data from 142 to 144, where 142=71*2, 144=2*2*2*2*3*3; reduce the length of the IFFT transform data from 169 to 162, where 169=13*13, 162=2*3*3*3*3, so that the prime base of the IFFT transform data length after the change is 2, 3, thereby implementing the algorithm of the IFFT and improving the speed of the IFFT transform, and at the same time In the Long Term Evolution (LTE), the IFFT transform data length prime number is required to be 2, 3, and 5. Therefore, the length of the IFFT transform data in the SPEED is increased or decreased to be compatible with the LTE requirements.

a second changing unit 1003, configured to change a length of the cyclic prefix CP and/or the guard interval GP, so that a symbol length of the changed CP is not less than a symbol length of the CP before the change, and the changed symbol to be processed The symbol length is the symbol length of the to-be-processed symbol before the change;

Specifically, in the case of the NSR, the pre-processed symbol length of the base station is 144, and the six symbols of the pre-processed symbol tail are repeatedly placed as CPs in front of the pre-processed symbols, and the generated symbol length is 150. The CP length maintains the original downlink precoding enhancement SPEED CP length 6 unchanged.

In the case of HSR, the FFT length of the pre-processed symbol of the base station is 162, and the 15 symbols at the end of the pre-processed symbol are repeatedly placed as CPs in front of the pre-processed symbol, and the length of the symbol is 177. The length of the CP has increased under the CP length of the original SPEED 8.

In the case of NSR, 6.25 GPs are added at the end of the entire burst length; in the case of HSR, 10.5 GPs are added at the end of the preprocessed symbol.

The sending unit 1004 is configured to form the changed symbol to be processed through a shaping filter, and send the data to the user equipment.

Specifically, the CP, the changed symbol to be processed, and the GP pass through a shaping filter Etc. form data. Wherein, the shaping filter suppresses the signal power outside the band of the transmission signal, so that the signal power outside the band is very low, so that the new burst formed by the shaping filter does not affect the signal outside the band during transmission.

As an optional embodiment, the base station further includes an adding unit, where the adding unit is specifically used to:

The indication information is added, and the indication information is sent to the user equipment, so that the user equipment determines, according to the indication information, whether the base station changes the symbol length of the valid data in the to-be-processed symbol.

The original method is a method other than the Signal Precoding Enhancements for EGPRS2 DL (SPEED) in the GERAN, such as a General Packet Radio Service (GPRS) or an Enhanced GPRS (Enhanced GPRS). EGPRS) and so on.

An embodiment of the present invention provides a base station, by changing a symbol length of valid data in a symbol to be processed, so that a prime number of a symbol length of the changed valid data is 2 and/or 3 and/or 5, and Determining a difference between a symbol length of the changed symbol to be processed and a symbol length of the to-be-processed symbol before the change; performing an inverse fast Fourier transform IFFT on the changed valid data; changing the cyclic prefix CP and/or The length of the guard interval GP is such that the symbol length of the changed CP is not less than the symbol length of the CP before the change, and the symbol length of the changed symbol to be processed is the symbol length of the to-be-processed symbol before the change; The changed symbol to be processed forms data through a shaping filter, and transmits the data to the user equipment, thereby implementing an IFFT change. Meanwhile, since the prime base of the FFT/IFFT in LTE is 2 or 3 or 5, , can be compatible with LTE.

Referring to FIG. 11, FIG. 11 is a structural diagram of a device of a user equipment according to an embodiment of the present invention. As shown in FIG. 11, the user equipment includes the following units:

The receiving unit 1101 is configured to receive data sent by the base station;

The determining unit 1102 is configured to determine, according to the indication information sent by the base station, whether the base station changes a symbol length of valid data in the to-be-processed symbol;

Removing the unit 1103 for removing the data according to the changed CP and GP symbol lengths Cyclic prefix CP, guard interval GP;

The obtaining unit 1104 is configured to perform fast Fourier transform FFT transform on the removed data to obtain data Data symbols in the valid data symbols, where the valid data symbols include a data Data symbol and a training sequence TS symbol.

Specifically, referring to Figure 6, in the case of HSR, 10.5 GP symbols at the end of the data are removed. In the case of the HSR, the 15 CP symbols preceding the filtered data are removed to form a pre-processed symbol.

In the case of NSR, the length of the pre-processed symbol is increased from the original 142 to 144, so that the FFT transform data length is 144. In the case of HSR, the length of the pre-processed symbol is reduced from the original 169 to 162, so that the FFT The length of the transformed data is 162, because 144=2*2*2*2*3*3, 162=2*3*3*3*3, so that the prime base of the FFT length after the change is 2, 3, thus The FFT algorithm implements and improves the speed of the FFT transform. At the same time, since the FFT length prime number is required to be 2, 3, and 5 in LTE, the FFT length in SPEED is increased or decreased to be compatible with LTE requirements.

As an optional embodiment, the user equipment further includes:

An embodiment of the present invention provides a user equipment, where the user equipment changes the symbol length of the valid data in the symbol to be processed, so that the prime number of the symbol length of the changed valid data is 2 and/or 3 and/or 5, And the symbol length of the changed symbol to be processed is different from the symbol length of the symbol to be processed before the change; performing fast inverse Fourier transform IFFT on the changed valid data; changing the cyclic prefix CP and / Or the length of the guard interval GP, such that the symbol length of the changed CP is not less than the symbol length of the CP before the change, and the symbol length of the changed symbol to be processed is the symbol length of the to-be-processed symbol before the change; Forming the changed symbol to be processed through a shaping filter, and transmitting the data to the user equipment, thereby implementing an IFFT change, and at the same time, because the prime base of the FFT/IFFT in LTE is 2 or 3 or 5 Therefore, it is compatible with LTE.

FIG. 12 is a structural diagram of a device of a base station according to an embodiment of the present invention. Referring to FIG. 12, FIG. 2 is a base station 1200 according to an embodiment of the present invention. The specific embodiment of the present invention does not limit the specific implementation of the base station. The base station 1200 includes: A processor 1201, a communication interface 1202, a memory 1203, and a bus 1204.

The processor 1201, the communication interface 1202, and the memory 1203 complete communication with each other via the bus 1204.

a communication interface 1202, configured to communicate with a user equipment;

The processor 1201 is configured to execute a program.

In particular, the program can include program code, the program code including computer operating instructions. The processor 1201 may be a central processing unit CPU, or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present invention.

The memory 1203 is used to store the program. The memory 1203 may include a high speed RAM memory and may also include a non-volatile memory such as at least one disk memory. The program specific can include:

Performing an inverse fast Fourier transform IFFT on the changed valid data;

The changing the symbol length of the valid data in the to-be-processed symbol includes:

In the case of HSR, the symbol length 169 of the valid data is reduced to 162.

The method further includes:

The base station adds the indication information, and sends the indication information to the user equipment, so that the user equipment determines, according to the indication information, whether the base station changes the symbol length of the valid data in the to-be-processed symbol. Degree.

FIG. 13 is a structural diagram of a device of a user equipment according to an embodiment of the present invention. Referring to FIG. 13, FIG. 13 is a user equipment 1300 according to an embodiment of the present invention. The specific implementation of the user equipment 1300 is not limited. The user equipment 1300 includes:

A processor 1301, a communication interface 1302, a memory 1303, and a bus 1304.

The processor 1301, the communication interface 1302, and the memory 1303 complete communication with each other via the bus 1304.

a communication interface 1302, configured to communicate with a base station;

The processor 1301 is configured to execute a program.

In particular, the program can include program code, the program code including computer operating instructions. The processor 1301 may be a central processing unit CPU, or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present invention.

The memory 1303 is used to store the program. The memory 1303 may include a high speed RAM memory and may also include a non-volatile memory such as at least one disk memory. The program specific can include:

If yes, calculating the symbol length of the changed valid data and the changed cyclic prefix CP and the guard interval GP symbol length; Deleting the cyclic prefix CP and the guard interval GP in the data according to the changed CP and GP symbol lengths;

The method further includes:

The above is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims

claims

1. A method of sending data, characterized in that the method includes:

Change the symbol length of the valid data in the symbol to be processed, so that the prime number base of the symbol length of the valid data after the change is 2 and/or 3 and/or 5, and the symbol length of the changed symbol to be processed is the same as before the change The symbol length of the symbols to be processed has the smallest difference. The effective data symbols include the symbol length of the data Data symbol and the training sequence TS symbol. The symbol length of the symbols to be processed includes the cyclic prefix CP, data symbols, TS symbols and guard interval GP. ;

Perform inverse fast Fourier transform IFFT on the changed effective data;

Change the length of the cyclic prefix CP and/or the guard interval GP so that the symbol length of the changed CP is not less than the symbol length of the CP before the change, and the symbol length of the symbol to be processed after the change is the same as before the change. Describes the symbol length of the symbol to be processed;

The changed symbols to be processed are passed through a shaping filter to form data, and the data is sent to the user equipment.

2. The method according to claim 1, characterized in that said changing the symbol length of valid data in the symbols to be processed includes:

In the case of NSR, increase the symbol length of the valid data from 142 to 144;

In the case of HSR, the symbol length of the valid data is reduced from 169 to 162.

3. The method according to claim 1 or 2, characterized in that, the method further includes: the base station adds indication information, and sends the indication information to the user equipment, so that the user equipment performs the operation according to the indication. The information determines whether the base station changes the symbol length of valid data in the symbols to be processed.

4. A method of receiving data, characterized in that the method includes:

Receive data sent by the base station, and determine whether the base station changes the symbol length of the valid data in the symbols to be processed according to the instruction information sent by the base station;

If so, calculate the symbol length of the changed valid data and the changed cyclic prefix CP and guard interval GP symbol length;

Remove the cyclic prefix CP and guard interval GP in the data according to the changed CP and GP symbol lengths;

Perform fast Fourier transform (FFT) on the removed data to obtain the numbers in the valid data symbols. According to Data symbols, the valid data symbols include Data Data symbols and training sequence TS symbols.

5. The method according to claim 4, characterized in that, the method further includes:

If not, the preset symbol length for receiving valid data remains unchanged.

6. A base station, characterized in that, the base station includes:

The first changing unit is used to change the symbol length of the valid data in the symbol to be processed, so that the prime number base of the symbol length of the changed valid data is 2 and/or 3 and/or 5, and the changed symbol length to be processed The symbol length of the symbol has the smallest difference from the symbol length of the symbol to be processed before the change. The effective data symbols include the symbol length of the Data symbol and the training sequence TS symbol. The symbol length of the symbol to be processed includes cyclic prefix CP, data symbols. , TS symbol and guard interval GP;

A transformation unit, used to perform an inverse fast Fourier transform IFFT on the changed effective data; a second changing unit, used to change the length of the cyclic prefix CP and/or the guard interval GP, so that the changed The symbol length of the CP is not less than the symbol length of the CP before the change, and the symbol length of the symbol to be processed after the change is the symbol length of the symbol to be processed before the change;

A sending unit, configured to pass the changed symbols to be processed through a shaping filter to form data, and send the data to the user equipment.

7. The base station according to claim 6, wherein the first changing unit performs changing the symbol length of the valid data in the symbols to be processed, including:

8. The base station according to claim 6 or 7, characterized in that the base station further includes an adding unit, and the adding unit is specifically used for:

Add indication information, and send the indication information to the user equipment, so that the user equipment determines whether the base station changes the symbol length of the valid data in the symbols to be processed based on the indication information.

9. A user equipment, characterized in that the user equipment includes:

The receiving unit is used to receive data sent by the base station;

A judgment unit configured to judge whether the base station changes the symbol length of the valid data in the symbols to be processed according to the instruction information sent by the base station;

Remove the unit, used to remove the cyclic prefix CP and guard interval GP in the data according to the changed CP and GP symbol lengths;

The acquisition unit is used to perform fast Fourier transform (FFT) on the removed data, and the acquisition is effective Data symbols among data symbols, the valid data symbols include data Data symbols and training sequence TS symbols.

10. The user equipment according to claim 9, characterized in that the user equipment further includes: a holding unit, configured to keep the preset symbol length for receiving valid data unchanged.