WO2012024913A1

WO2012024913A1 - Method, apparatus and system for transmitting, receiving and delivering data

Info

Publication number: WO2012024913A1
Application number: PCT/CN2011/070812
Authority: WO
Inventors: 李萍
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-08-26
Filing date: 2011-01-30
Publication date: 2012-03-01
Also published as: CN102387101A; CN102387101B

Abstract

A method, an apparatus and a system for transmitting, receiving and delivering data are disclosed in the present invention. The method for transmitting data comprises: according to the used cyclic prefix (CP) length, each transmission end maps user data information and pilot bit information, which are to be transmitted, to the frequency domain resources assigned to it, and obtains a frequency domain signal; wherein, the transmission end using the CP with a preset length maps the user data information and the pilot information to the frequency domain resources continuously, and the transmission end using the CP with a non-preset length maps the user data information and the pilot information to the frequency domain resources discontinuously; each transmission end transforms the frequency domain signal into a time domain signal, and transmits the time domain signal after adding the CP to it; wherein, before adding the CP to the time domain signal, the transmission end using the CP with the non-preset length removes a part of the time domain signal, and the length and the location of the removed time domain signal correspond to the CP length used by the transmission end. With the present invention, the coexistence of users with different delays in the same sub-frame can be supported.

Description

TECHNICAL FIELD The present invention relates to the field of communications, and in particular, to a data transmitting, receiving, and transmitting method, a transmitting end, a receiving end, and a data transmission system. BACKGROUND OF THE INVENTION Long Term Evolution (LTE) downlink uses Orthogonal Frequency Division Multiplexing (OFDM) technology, and OFDM has high spectrum utilization, multipath interference, etc. Features, OFDM systems can effectively resist the effects of wireless channels. The LTE uplink transmission scheme uses a single carrier frequency division multiplexing multiple access system (SC-FDMA) with a cyclic prefix, and uses a discrete Fourier transform (Discrete Fourier transform) in the uplink SC-FDMA transmission scheme with a cyclic prefix. Fourier Transform (referred to as DFT) obtains the frequency domain signal, then inserts the zero symbol for spectrum shifting, and the shifted signal passes through IFFT (hence, the SC-FDMA system is also called DFT-S-OFDM system), which can lower the transmitting terminal. Peak to average power ratio.

In OFDM technology, in order to minimize inter-symbol interference, a guard interval is inserted between each OFDM symbol, and the length of the guard interval is generally larger than the maximum delay spread in the wireless channel, such that the multipath component of one symbol Will not cause interference to the next symbol. A commonly used guard interval is the cyclic prefix (CP), which replicates the symbols cyclically, that is, the samples in the latter part of each OFDM symbol are copied to the front of the OFDM symbol to form a prefix without any discontinuity at the handover point. Increasing the guard interval between symbols increases the waveform length of the symbol. In the existing LTE system, users of the same subframe are superimposed on each other at the receiving end.

In the case of CP, the superimposed signals are uniformly processed. In order to ensure that the conditions for increasing the CP to eliminate inter-symbol interference are not destroyed, different users need to select the same CP length. However, in practical applications, in some environments, in order to apply different signal coverage, some users in the cell need to support different lengths of delay extension, and use CPs of different lengths. In this case, the receiving end pairs the mixed signals. When going to the CP, which user's CP length is the standard will result in a thousand between the symbols. SUMMARY OF THE INVENTION A primary object of the present invention is to provide a data transmitting, receiving, and transmitting method, a transmitting end, a receiving end, and a data transmission system, so as to at least solve the above-mentioned system in which the same user can not use CPs of different lengths. The problem. According to an aspect of the present invention, a data transmission system is provided, comprising: a plurality of transmitting ends, each transmitting end being configured to map user data information and pilot bit information to be transmitted to be according to a length of a CP used thereby On the allocated frequency domain resources, the frequency domain signal is obtained, and the frequency domain signal is converted into a time domain signal, and the CP is added after the time domain signal is added; wherein, the transmitting end of the CP of the preset length is used to transmit the user data information and the guide. The frequency bit information is continuously mapped to the frequency domain resource; the transmitting end of the non-preset length CP is used to non-continuously map the user data information and the pilot bit information to the frequency domain resource, and remove the CP before adding the CP in the time domain signal. Part of the time domain signal; the receiving end is configured to receive the time domain signal sent by the multiple transmitting ends, remove the preset length CP from the received time domain signal, and then convert the time domain signal after removing the CP into the frequency domain The signal is respectively located in the frequency domain resource position of the continuous mapping and the discontinuous mapping, and the user data information and the pilot bit information sent by each transmitting end are extracted. The transmitting end includes: a pilot code generating module, configured to generate the pilot bit information according to a resource length allocated for the transmitting end, and input a resource mapping module; and a user data generating module, configured to be modulated Subsequent user symbols are precoded to generate the user data information and input to the resource mapping module; the resource mapping module is configured to map the input pilot bit information and the user data information to the transmission And obtaining the frequency domain signal on the frequency domain resource allocated by the terminal, and then inputting the time domain signal generating module, where if the transmitting end uses the CP of the preset length, the mapping is performed by using a continuous mapping manner, if The transmitting end uses a CP that is not the preset length, and then performs mapping by using a non-continuous mapping manner; the time domain signal generating module is configured to transform the input frequency domain signal into a time domain, to obtain the a time domain signal, and adding the CP to the time domain signal, and then outputting to the antenna for transmitting, wherein if the transmitting end uses a non-preset The length of the CP, the time domain signal generating module removes part of the time domain signal before adding the CP to the time domain signal. Wherein, the CP that is not the preset length includes a plurality of CPs of a length, and for a plurality of the transmitting ends that use a CP that is not the preset length, the transmitting end with a different CP length is used to remove a part. The length and position of the time domain signals are different. The receiving end includes: a cyclic prefix removing module, configured to receive a time domain signal sent by the multiple transmitting ends over a wireless channel, and remove the preset length CP from the time domain signal; The time-frequency domain conversion module is configured to transform the time domain signal of the removed CP to the frequency domain, and input the frequency domain separation module; the frequency domain separation module is configured to respectively use the frequency domain resource according to the discontinuous mapping and the continuous mapping And extracting user data information and pilot bit information sent by each of the received transmitting ends. The receiving end further includes: a channel estimation module, configured to perform channel estimation of the pilot bit according to the received pilot bit information and local pilot bit information, and compare the channel of the pilot bit Estimating a channel estimate of the user data bits; a demodulation module configured to perform demodulation of the user information using the received user data information and channel estimate values for the user data bits. The non-continuous mapping includes: mapping to the frequency domain resource at intervals, where the pilot bit information and the user data information occupy non-contiguous subcarriers. Wherein, the mapping is mapped at equal intervals. According to another aspect of the present invention, a transmitting end is provided, including: a pilot code generating module, configured to generate pilot bit information according to a resource length allocated for a transmitting end, and input a resource mapping module; a user data generating module, The method is configured to precode the modulated user symbol to generate user data information and input the resource mapping module; the resource mapping module is configured to map the input pilot bit information and user data information to a frequency domain allocated for the transmitting end The frequency domain signal is obtained on the resource, and then input into the time domain signal generating module. If the transmitting end uses the CP of the preset length, the mapping is performed by using the continuous mapping manner. If the transmitting end uses the CP of a non-pre-defined length, then Mapping in a non-continuous mapping manner; the time domain signal generating module is configured to transform the input frequency domain signal into a time domain, obtain a time domain signal, and add a CP in the time domain signal, and then output the output to the antenna, where If the transmitting end uses a CP of a non-preset length, the time domain signal generating module adds a CP to the time domain signal before going to Except for part of the time domain signal, the length and position of the removed part of the time domain signal correspond to the length of the CP used. The manner of the discontinuous mapping includes: mapping to the frequency domain resource at intervals, where the pilot bit information and the user data information occupy non-contiguous subcarriers. Wherein, the mapping is mapped at equal intervals. According to still another aspect of the present invention, a receiving end is provided, including: a cyclic prefix removing module, configured to receive a time domain signal sent by multiple transmitting ends over a wireless channel, and remove the pre-time signal from the time domain signal a length CP; a time-frequency domain conversion module, configured to transform the time domain signal of the removed CP to the frequency domain, and input the frequency domain separation module; the frequency domain separation module is set to be based on the discontinuous mapping and the connection respectively The mapped frequency domain resource location is extracted, and the received user data information and pilot bit information sent by each transmitting end are extracted. The receiving end further includes: a channel estimation module, configured to perform channel estimation of pilot bits according to the received pilot bit information and local pilot bit information, and obtain a user according to channel estimation of the pilot bit Channel estimation of data bits; a demodulation module configured to perform demodulation of user information using the received user data information and channel estimate values of the user data bits. According to still another aspect of the present invention, a data transmission method is provided, including: mapping, by each of a plurality of transmitting ends, user data information and pilot bit information to be transmitted according to a length of a cyclic prefix CP used by the plurality of transmitting ends A frequency domain signal is obtained on the frequency domain resource allocated thereto; wherein, the transmitting end of the CP of the preset length continuously maps the user data information and the pilot bit information to the frequency domain resource, and uses the CP of a non-preset length The transmitting end non-continuously maps the user data information and the pilot bit information to the frequency domain resource; each transmitting end converts the frequency domain signal into a time domain signal, and adds the CP in the time domain signal, and then sends the non-preset The transmitting end of the CP of the length removes part of the time domain signal before adding the CP in the time domain signal; the receiving end receives the time domain signal sent by the multiple transmitting ends, and removes the CP of the preset length from the received time domain signal; The terminal transforms the time domain signal after the CP is removed into a frequency domain signal; the receiving end extracts the users sent by the respective transmitting ends according to the frequency domain resource positions of the continuous mapping and the discontinuous mapping respectively. According to information and pilot bit information. The CP that is not the preset length includes multiple lengths of CPs, and for a plurality of transmitting ends that use CPs that are not the preset length, the transmitting ends that use different CP lengths are in the removal part. When the time domain signal is used, the length and position of the removal are different. The non-continuous mapping of the user data information and the pilot bit information to the frequency domain resource by using a transmitting end of the CP that is not the preset length includes: using a transmitting end of the CP that is not the preset length The user data information and the pilot bit information are intermittently mapped to the frequency domain resource, and the pilot bit information and the user data information occupy non-contiguous subcarriers. According to still another aspect of the present invention, a data transmission method is provided, including: mapping, by each of a plurality of transmitting ends, user data information and pilot bit information to be transmitted to a length of a cyclic prefix used by the plurality of transmitting ends to A frequency domain signal is obtained on the frequency domain resource allocated thereto, wherein the transmitting end of the CP of the preset length continuously maps the user data information and the pilot information to the frequency domain resource, and uses the transmission of the CP of the non-preset length The terminal maps the user data information and the pilot information to the frequency domain resource discontinuously; each transmitting end converts the frequency domain signal into a time domain signal, and sends the CP after adding the CP in the time domain signal, where the CP of the non-preset length is used. The transmitter transmits the CP before adding the CP in the time domain signal. In addition to the partial time domain signal, the length and position of the removed time domain signal correspond to the length of the CP used by the transmitting end. According to still another aspect of the present invention, a data receiving method is provided, including: receiving, by a receiving end, a time domain signal sent by multiple transmitting ends, removing a preset length CP from the received time domain signal; and receiving the mobile terminal The time domain signal after the CP is transformed into a frequency domain signal, and then the frequency domain resource positions of the continuous mapping and the discontinuous mapping are respectively respectively, and the user data information and the pilot bit information transmitted by each transmitting end are extracted. After the receiving end extracts the user data information and the pilot bit information sent by each of the transmitting ends, the method further includes: the receiving terminal receives the pilot bit information and the local pilot bit The information is used for channel estimation of the pilot bit, and the channel estimate of the user data bit is obtained according to the channel estimate of the pilot bit; the receiving end uses the received user data information and the channel of the user data bit The estimated value completes the demodulation of the user information. Through the present invention, users of different length CPs use different methods to map data to frequency domain resources, thereby supporting users with different delays to coexist in the same subframe, and under the same conditions, without lowering the user transmission rate, The inter-symbol interference caused by users of the same cell using different length CPs is avoided, so that the signal coverage of different users may be different. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, 1 is a schematic structural diagram of a data transmission system according to Embodiment 1 of the present invention; FIG. 2 is a schematic structural diagram of a transmitting end 2 according to Embodiment 2 of the present invention; FIG. 3 is a receiving end according to Embodiment 3 of the present invention; 4 is a schematic structural diagram of a preferred receiving end 4 according to Embodiment 3 of the present invention; FIG. 5 is a flowchart of a data transmitting method according to Embodiment 4 of the present invention; FIG. 6 is a flowchart according to an embodiment of the present invention. FIG. 7 is a flowchart of a data receiving method according to Embodiment 7 of the present invention; FIG. 8 is a schematic diagram of a data transmission process in Embodiment 7 of the present invention; FIG. 9 is a flow chart of transmitting data at the transmitting end of User 1 in Embodiment 7 of the present invention; FIG. 10 is a transmission of User 2 in Embodiment 7 of the present invention; FIG. 11 is a flowchart of receiving data by a receiving end according to Embodiment 7 of the present invention; FIG. 12 is a schematic diagram of resource mapping according to Embodiment 6 of the present invention; FIG. 13 is another schematic diagram of Embodiment 6 of the present invention. A schematic diagram of a resource map. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. Embodiment 1 FIG. 1 is a schematic structural diagram of a data transmission system according to Embodiment 1 of the present invention. As shown in FIG. 1, the system includes: a plurality of transmitting ends 2 and a receiving end 4. Each of the multiple transmitting ends 2 is located in a user equipment. In the embodiment of the present invention, the lengths of the cyclic prefix used by each user equipment may be different. Each of the transmitting ends 2 is configured to map the user data information and the pilot bit information to be transmitted to the frequency domain resource allocated to the transmitting end (ie, the user equipment where the transmitting end is located) according to the length of the cyclic prefix used by the transmitting end 2 Up, obtain a frequency domain signal, and convert the frequency domain signal into a time domain signal, and send the CP after adding the CP in the time domain signal; wherein, the transmitting end 2 of the CP of the preset length uses the user data information and the pilot bit The information is continuously mapped to the frequency domain resources allocated thereto; the transmitting end 2 of the non-preset length CP is used to non-continuously map the user data information and the pilot bit information to the frequency domain resources allocated thereto, and in the time domain Before the CP is added to the signal, part of the time domain signal is removed, and then the CP is added to the time domain signal after removing part of the time domain signal. Wherein, if the number of the transmitting ends 2 of the non-preset length CP is plural, and the CPs used by the plurality of transmitting ends 2 have different lengths, the transmitting end 2 with different CP lengths is used when the part is removed. The length and position of the domain signal are removed. For example, if two lengths of CP are used in the system, and one of the lengths is the above-mentioned preset length, for the transmitting end 2 using another length CP, the time domain can be removed when the time domain signal is removed. A time domain signal with half the length of the signal. If the system uses three CPs of length (one of which is the above preset length), for the convenience of description, the transmitting end 2 using the preset length CP is referred to as the first type of transmitting end, and the second length CP is used for transmitting. Terminal 2 is called a second type of transmitting end, and a transmitting end 2 using a third length CP is called a third type of transmitting end, and the first type of transmitting end uses a resource continuous mapping manner to user data signal and pilot bit information. On the frequency domain resource allocated to it, the pilot bit information and the user data information occupy the same subcarrier; and the second type of transmitting end and the third type of transmitting end use the resource discontinuous mapping manner to transmit the pilot bit information. And the user data information is mapped to the frequency domain resource allocated thereto. Preferably, the second type of transmitting terminal pilot bit information and the user data information may be mapped to the allocated frequency domain resource block at intervals, the pilot bit information and the user. The data information occupies the same non-contiguous subcarrier; and the second type of transmitter removes the time domain signal of half the length of the time domain signal after transforming the frequency domain signal into a time domain signal (for example, truncating the time domain signal) 1/4 and 1/4 of the signal), and the third type of transmitter removes the time domain signal of the length and position of the removed time domain signal different from the second type of transmitter after converting the frequency domain signal into a time domain signal . In practical applications, the resource mapping manner corresponding to each CP length may be configured according to the length of the CP used in the system, and/or the length and location of the time domain signal may be removed. When used, each transmitting end may use the same. The resource mapping manner corresponding to the CP length performs resource mapping, and removes the length and position time domain signals corresponding to the length of the CP used. The receiving end 4 is configured to receive the time domain signal sent by the multiple transmitting ends 2, remove the CP of the preset length from the received time domain signal, and then convert the time domain signal after removing the CP into a frequency domain signal, Then, according to the frequency domain resource locations of the continuous mapping and the discontinuous mapping, the user data information and the pilot bit information transmitted by each transmitting end 2 are extracted. In the foregoing system provided by the embodiment of the present invention, when transmitting data, the transmitting end 2 may determine the manner of resource mapping according to the length of the CP used by the transmitting end 2, and remove the time domain signal to be sent by the transmitting end using a certain CP length, thereby The CPs of different lengths can be used by using different user equipments, and the receiving end 4 can parse out the data sent by each user equipment according to the frequency domain resource locations of the continuous mapping and the non-continuous mapping when parsing. The second embodiment of the present invention is shown in FIG. The module 20, the user data generating module 22, the resource mapping module 24, and the time domain signal generating module 26. The pilot code generating module 20 is configured to allocate according to the transmitting end (that is, where the transmitting end is located) The resource length of the user equipment is used to generate pilot bit information, and is input to the resource mapping module. For example, the length of the resource allocated to the transmitting end is 2M, and if the length of the CP used by the transmitting end is a preset length (that is, the transmitting end is The length of the pilot bit information generated by the pilot code generating module 20 is 2M, and if the length of the CP used by the transmitting end is not the preset length, that is, the transmitting end is not the first type of transmitting end, The second type of transmitting end, the length of the pilot bit information generated by the pilot code generating module 20 is M; the user data generating module 22 is configured to precode the modulated user symbol to generate user data information. And input the resource mapping module 24; the resource mapping module 24 is configured to map the input pilot bit information and the user data information to the frequency domain resource allocated to the transmitting end to obtain a frequency domain signal, and then input the time domain signal generating module 26 If the transmitting end uses a CP of a preset length, the resource mapping module 24 performs mapping by using a continuous mapping manner, if the transmitting end uses a preset length other than the preset length. The CP of the degree, the resource mapping module 24 performs mapping by means of non-continuous mapping; the time domain signal generating module 26 is configured to transform the input frequency domain signal into the time domain to obtain a time domain signal, and in the time domain signal Increasing the CP used by the transmitting end, and then outputting to the antenna for transmitting, wherein if the transmitting end uses a CP other than the preset length (ie, not the first type of transmitting end), the time domain signal generating module 26 is in the time domain signal. Part of the time domain signal is removed before the CP is added. Preferably, if the non-first type of transmitting end includes multiple types (where the lengths of the CPs used by the various types of transmitting ends are different from each other), the time domain signal generating module 26 of the multi-type transmitting end removes part of the time domain signal. The length and position of the partial time domain signal are different, and the length and position of the partial time domain signal removed by the real-time signal generating module 26 correspond to the CP length used by the transmitting end. Preferably, the mapping by the resource mapping module 24 in the manner of non-continuous mapping includes: the resource mapping module 24 intermittently mapping the user data information and the pilot bit information to the frequency domain resource, the pilot bit information and the user data. Information occupies non-contiguous subcarriers. The resource mapping module 24 may equally map the user data information and the pilot bit information to the frequency domain resource. With the foregoing transmitting end 2 provided by the embodiment of the present invention, when the user equipments of different lengths of CP are used to transmit data, the resource mapping manner and the processing of the time domain signal can be distinguished, so that the receiving end 4 can remove the unified CP. The data is parsed, so that users of the same 'j, zone' can use different lengths of CP to transmit data, thereby achieving different signal coverage of different users while reducing inter-symbol interference. Embodiment 3 FIG. 3 is a schematic structural diagram of a receiving end 4 according to Embodiment 3 of the present invention, and the receiving end can be used in conjunction with the transmitting end 2 of Embodiment 2. As shown in FIG. 3, the receiving end mainly includes: a cyclic prefix The module 40, the time-frequency domain conversion module 42 and the frequency domain separation module 44 are removed. The cyclic prefix removal module 40 is configured to receive a time domain signal sent by the multiple transmitting ends 2 through the wireless channel, and remove a preset length CP from the time domain signal; the time frequency domain conversion module 42 is configured to The time domain signal of the removed CP is transformed into the frequency domain, and the frequency domain separating module 44 is input; the frequency domain separating module 44 is configured to extract the received transmitting end 2 according to the discontinuous mapping and the continuously mapped frequency domain resource position respectively. User data information and pilot bit information. The non-continuous mapping manner may be an interval mapping, and is preferably an equal interval mapping. Preferably, as shown in FIG. 4, the receiving end 4 of the third embodiment of the present invention may further include: a channel estimation module 46 and a demodulation module 48, wherein the channel estimation module 46 is configured to receive the pilot bit information according to The local pilot bit information performs channel estimation of the pilot bit, and the channel estimate of the user data bit is obtained according to the channel estimation of the pilot bit; the demodulation module 48 is configured to use the received user data information and the user data bit. The channel estimate completes the demodulation of the user information. With the receiving end 4 of the embodiment of the present invention, the data transmitted by the transmitting end 2 with different CP lengths can be parsed by removing the unified CP, so that users of the same cell can use different lengths of CP to transmit data, thereby reducing the symbol. Different signal coverage of different users can be realized at the same time. Embodiment 4 FIG. 5 is a flowchart of a data transmission method according to Embodiment 4 of the present invention, which may be implemented by the system, the transmitting end or the receiving end of Embodiments 1 to 3 above. As shown in FIG. 5, the method mainly includes the following steps: Step S502: Each of the multiple transmitting ends 2 transmits user data information and a guide to be transmitted according to the length of a cyclic prefix (CP) used by the transmitting end 2. The frequency bit information is mapped to the frequency domain resource allocated thereto to obtain a frequency domain signal; wherein, the transmitting end (the first type of transmitting end) of the CP of the preset length continuously maps the user data information and the pilot information to the frequency a domain resource, using a non-pre-set length CP transmitter (second and third N-type transmitters) to non-continuously map user data information and pilot information to frequency domain resources; for example, the first type of transmitter will user data The information and the pilot bit information are continuously mapped to the allocated frequency domain resources, and the pilot bit information and the user data information occupy the same subcarrier; the second and third N transmitters both transmit the pilot bit information and the user data information. The interval is mapped to the allocated frequency domain resources, and the pilot bit information and the user data information occupy the same non-contiguous subcarrier. Step S504, each transmitting end 2 converts the frequency domain signal into a time domain signal, and sends a CP after adding the CP in the time domain signal, where the transmitting end of the CP using a non-predetermined length increases the CP before the time domain signal If the system includes two types of transmitting ends, for example, if the second type of transmitting end converts the frequency domain signal into a time domain signal, the partial time domain signal is removed, and the new time domain signal is added. The cyclic prefix is output to the transmitting antenna for transmission. Preferably, the length of the removed partial time domain signal is 1/2 of the length of the original time domain signal. If the system further includes a third type of transmitting end, the third type of transmitting end removes part of the time domain signal, and the length of the removed part of the time domain signal is different from the length and position of the second type of transmitting end, for example, removed. The time domain signal can be 2/3 in length. Step S506, the receiving end 4 receives the time domain signals sent by the multiple transmitting ends 2, and removes the CP of the preset length from the received time domain signal. In the embodiment of the present invention, the second and third N types of signals are removed. Part of the time domain signal, therefore, the receiving end 4 can remove the unified CP when parsing, that is, the CP corresponding to the preset length. Step S508, the receiving end 4 converts the time domain signal after removing the CP into a frequency domain signal. In step S510, the receiving end 4 respectively has a continuous mapping of the transmitting end and a frequency domain resource position of the discontinuous mapping, and extracts the sending of each of the transmitting ends 2 User data information and pilot bit information. In the embodiment of the present invention, the receiving end 4 may separately extract the pilot bit information of the received discontinuous mapping user and receive the user data information according to the frequency domain resource location of the frequency domain resource discontinuous mapping and the frequency domain resource continuous mapping. And receiving the pilot bit information of the continuously mapped user, and receiving the user data information. Preferably, after receiving the user data information and the pilot bit information sent by each transmitting end 2, the receiving end 4 can refer to the received guide. The frequency bit information and the local pilot bit information perform channel estimation of the pilot bit, and the channel estimation of the user data bit can be obtained by channel estimation of the pilot bit, and then, the receiving end 4 uses the received user data information and the user data bit. The channel estimation completes the demodulation of the user information. With the above data transmission method of the embodiment of the present invention, users of the same j, zone can use different lengths of CPs for data transmission, and can avoid inter-symbol interference. Embodiment 5 6 is a flowchart of a data transmission method according to Embodiment 5 of the present invention. As shown in FIG. 6, the method mainly includes the following steps: Step S602: Each of the multiple transmitting ends 2 is in accordance with the cycle of its use. The length of the prefix maps the user data information and the pilot bit information to be transmitted to the frequency domain resource allocated thereto, and obtains a frequency domain signal, where the transmitting end of the CP using the preset length transmits the user data information and the pilot The bit information is continuously mapped to the frequency domain resource, and the transmitting end of the CP of the preset length is used to non-continuously map the user data information and the pilot bit information to the frequency domain resource; Step S604, each transmitting end 2 frequency The domain signal is transformed into a time domain signal, and the CP is sent after the CP is added to the time domain signal, wherein the transmitting end of the non-preset length CP is used to remove the partial time domain signal before the CP is added to the time domain signal, and the removed time domain signal is removed. The length and position correspond to the length of the CP used by the transmitting end. For example, if the system includes two types of transmitting ends, the second type of transmitting end converts the frequency domain signal into a time domain signal, removes part of the time domain signal, adds a cyclic prefix according to the new time domain signal, and outputs the signal to the transmitting antenna. Transmit, preferably, the length of the removed partial time domain signal is 1/2 of the length of the original time domain signal. If the system further includes a third type of transmitting end, the third type of transmitting end removes part of the time domain signal, and the length and position of the removed part of the time domain signal are different from the length and position removed by the second type of transmitting end, for example, Can be 2/3. The above data transmission method in the embodiment of the present invention can enable users of the same 'j, zone' to use different CPs to transmit data, and can avoid inter-symbol interference while ensuring different signal coverage of different users. Embodiment 6 FIG. 7 is a flowchart of a data receiving method according to Embodiment 6 of the present invention, which may be used as a subsequent flow of the transmitting method shown in FIG. 6. As shown in FIG. 7, the method mainly includes the following steps: Step S602: The receiving end 4 receives a time domain signal sent by multiple transmitting ends 2, and removes a CP of a preset length from the received time domain signal. Step S604, receiving The terminal 4 converts the time domain signal after removing the CP into a frequency domain signal. Step S608, the receiving end 4 extracts user data information and pilot information sent by each transmitting end 2 according to the frequency domain resource positions of the continuous mapping and the discontinuous mapping, respectively. Bit information. In the embodiment of the present invention, the receiving end 4 may separately extract the pilot bit information of the received discontinuous mapping user and receive the user data information according to the frequency domain resource location of the frequency domain resource discontinuous mapping and the frequency domain resource continuous mapping. And receiving the pilot information of the continuously mapped user, and receiving the user data information; preferably, the receiving end 4 extracts the user data information and the pilot bit information sent by each of the transmitting ends 2, according to the received pilot bit information and The local pilot bit information performs channel estimation of the pilot bit, and the channel estimation of the user data bit can be obtained by channel estimation of the pilot bit. Then, the receiving end 4 completes the user by using the received user data information and the channel estimation of the user data bit. Demodulation of information. The seventh embodiment of the present invention takes two users as an example. The length of the CP used by user 1 (ie, the first type of transmitting end, the user is called the first type of user) is M1, and user 2 (ie, the second The class transmitter, the user is called the class 2 user. The length of the CP used is M2, where Ml is not necessarily equal to M2. FIG. 8 is a schematic diagram of a data transmission process according to an embodiment of the present invention. FIG. 9 is a flowchart of sending data at a sending end of user 1 according to an embodiment of the present invention, and FIG. 10 is a sending end of user 2 at a sending end according to an embodiment of the present invention. FIG. 11 is a flowchart of receiving data by a receiving end according to an embodiment of the present invention. The data transmission process in the embodiment of the present invention will be described below with reference to FIGS. 8 to 11. At the transmitting end, the pilot code generating module locates the resource allocation status of the target user. For the user 1, the pilot code of the allocated resource length (M1) is generated. For the generation of the pilot code, refer to the Zadoff-Chu code in the 3GPP protocol TS 36.211. The generation of the pilot code of the length M1 is sent to the resource mapping module; for the user 2, the pilot code of the allocated resource length (M2/2) is generated, and the generation of the pilot code can refer to the 3GPP protocol TS. In the method of generating the Zadoff-Chu code in 36.211, the generated pilot code of length M2/2 is sent to the resource mapping module. The user data generating module pre-codes the user-modulated symbol, performs a discrete Fourier transform of the M1 point for the user 1, and performs a discrete Fourier transform of the M2 point for the user 2, and sends it together with the generated pilot code sequence. The resource mapping module maps the input user data information and the pilot code sequence to frequency domain resources allocated for each user, where the user 2 mapping supports the frequency domain resource discontinuous mapping on the allocated RBs. The pilot, the pilot bit information (ie, the pilot code sequence) and the user data information are equally mapped onto the allocated RB, and the pilot bit information and the user data information occupy the same non-contiguous subcarrier, as shown in FIG. Zeros are padded on unassigned frequency domain resources. The user 1 mapping supports continuous mapping of frequency domain resources on the allocated RBs, and the pilot bit information and the user data information are equally mapped to the allocated frequency domain resources, and the pilot bit information and the user data information occupy the same subcarrier, The unallocated frequency domain resources shown in Figure 13 are padded with zeros. The time domain signal module performs an N-point inverse Fourier transform on the input data and the pilot mapped frequency domain signal to the time domain, wherein, for the user 1, the time domain signal module adds a cyclic prefix to the transformed time domain signal ( Called CP1), the time domain signal to be transmitted is generated, and finally the time domain signal is output to the transmitting antenna for transmission. For user 2, the time domain signal module removes part of the time domain signal, adds a cyclic prefix (called CP2) according to the new time domain signal, generates a time domain signal to be transmitted, and finally outputs the time domain signal to the transmitting antenna for transmission. At the receiving end, receiving data of the wireless channel transmitted by the two user transmitting antennas, the cyclic prefix removing module removes the cyclic prefix of the received data according to the cyclic prefix length CP1 added by the transmitting end; the time-frequency conversion module removes the cyclic prefix The time domain signal is then Fourier Fourier transformed into the frequency domain; the frequency domain separation module extracts the pilot bit information, user data information of the received discontinuous mapping user according to the frequency domain resource locations mapped by the user 1 and the user 2, respectively. Extracting pilot bit information and user data information of the received continuous mapping user; the channel estimation module performs channel estimation of the pilot bit according to the received pilot bit information and local pilot bit information, and calculates channel characteristics of the pilot bit; User 2, the channel estimation value of the mapped subcarrier bits that are not mapped is obtained by the adjacent subcarrier pilot bit channel estimation value, for example, may be the same as the adjacent one subcarrier, and may also be a sub-carrier that is not mapped. The pilot bit channel estimation values on the two subcarriers adjacent to the carrier bit are averaged to obtain the subcarriers that are not mapped. Bit channel estimation value, it should be noted that the channel estimation method in which the user has no mapped subcarrier bits is not limited thereto, and other methods for obtaining the subcarrier channel channel estimation by the pilot bit channel estimation may be used; The user data bit channel estimation can be obtained by pilot bit channel estimation; finally, the demodulation module performs frequency domain demodulation of the user information by using the user to receive the frequency domain data and the channel estimation value of the user data bit. Demodulation methods include MMSE equalization, MF equalization, ZF equalization, and the like. It should be noted that the present invention is applicable to, but not limited to, an OFDM system. From the above description, it can be seen that, in the embodiment of the present invention, users in the same 'j, zone can use CPs of different lengths, wherein users of different length CPs use resource mapping mode and processing time domain signals Differentiate, so that the receiving end can use a unified CP for parsing, thus supporting Users with different delays coexist in the same subframe, and under the same conditions, the user transmission rate is not reduced, and the inter-symbol interference caused by users of the same cell using different length CPs is well avoided, thereby making the difference The user's signal coverage can be different. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

1. A data transmission system comprising:

a plurality of transmitting ends, each transmitting end is configured to map the user data information and the pilot bit information to be transmitted to the frequency domain resource allocated thereto according to the length of the cyclic prefix CP used, to obtain a frequency domain signal, Converting the frequency domain signal into a time domain signal, transmitting the CP after adding the CP in the time domain signal; wherein, the transmitting end of the CP of the preset length continuously maps the user data information and the pilot bit information to the a frequency domain resource; using a transmitting end of the CP of the preset length to non-continuously map the user data information and pilot bit information to the frequency domain resource, and adding the CP to the time domain signal And removing the part of the time domain signal; the receiving end is configured to receive the time domain signal sent by the multiple transmitting ends, remove the CP of the preset length from the received time domain signal, and then move The time domain signal after the CP is transformed into a frequency domain signal, and then the user data information and the pilot bit information sent by each of the transmitting ends are extracted according to the frequency domain resource positions of the continuous mapping and the discontinuous mapping, respectively. .

2. The system according to claim 1, wherein the transmitting end comprises:

a pilot code generating module, configured to generate the pilot bit information according to a resource length allocated to the transmitting end, and input a resource mapping module;

a user data generating module, configured to precode the modulated user symbol, generate the user data information, and input the resource mapping module;

The resource mapping module is configured to map the input pilot bit information and the user data information to a frequency domain resource allocated to the transmitting end to obtain the frequency domain signal, and then input the time domain signal generating module, If the transmitting end uses the CP of the preset length, the mapping is performed by using a continuous mapping manner. If the transmitting end uses a CP that is not the preset length, the method is performed by using a non-continuous mapping manner. Mapping

The time domain signal generating module is configured to transform the input frequency domain signal into a time domain, obtain the time domain signal, add the CP to the time domain signal, and then output the output to an antenna, where And if the transmitting end uses a CP that is not the preset length, the time domain signal generating module removes part of the time domain signal before adding the CP in the time domain signal.

The system according to claim 1 or 2, wherein a CP that is not of the preset length includes a plurality of CPs of a length, and is used for a plurality of the transmitting ends that use a CP that is not the preset length. The lengths and positions of the time domain signals of the transmitting end removal portions of the CPs having different CP lengths are different.

4. The system according to claim 3, wherein the receiving end comprises:

a cyclic prefix removal module, configured to receive a time domain signal sent by the multiple transmitting ends over a wireless channel, and remove the preset length CP from the time domain signal;

The time-frequency domain conversion module is configured to transform the time domain signal of the removed CP to the frequency domain, and input the frequency domain separation module;

The frequency domain separation module is configured to extract, according to the discontinuous mapping and the continuously mapped frequency domain resource locations, the received user data information and the pilot bit information sent by each of the transmitting ends.

The system according to claim 4, wherein the receiving end further comprises:

a channel estimation module, configured to perform channel estimation of pilot bits according to the received pilot bit information and local pilot bit information, and obtain channel estimation of user data bits according to channel estimation of the pilot bits;

A demodulation module is arranged to perform demodulation of the user information using the received user data information and channel estimate values of the user data bits.

The system according to claim 3, wherein the discontinuous mapping comprises: spacingly mapping to the frequency domain resource, wherein the pilot bit information and the user data information occupy non-contiguous subcarriers.

7. The system of claim 6, wherein the discontinuous mapping comprises: mapping onto the frequency domain resources at equal intervals.

8. A type of transmitting end, including:

a pilot code generating module, configured to generate pilot bit information according to a resource length allocated for the transmitting end, and input a resource mapping module;

a user data generating module, configured to precode the modulated user symbol, generate user data information, and input the resource mapping module; The resource mapping module is configured to map the input pilot bit information and the user data information to a frequency domain resource allocated to the transmitting end, and then input a time domain signal generating module, where If the transmitting end uses the CP of the preset length, the mapping is performed by using a continuous mapping manner, and if the transmitting end uses a CP that is not the preset length, the mapping is performed by using a non-continuous mapping manner;

The time domain signal generating module is configured to transform the input frequency domain signal into a time domain, obtain a time domain signal, and add the CP in a time domain signal, and then output the output to an antenna, where The transmitting end uses a CP that is not the preset length, and the time domain signal generating module removes part of the time domain signal before adding the CP in the time domain signal, and removes part of the length of the time domain signal. And the position corresponds to the length of the CP used.

The transmitting end according to claim 8, wherein the manner of the discontinuous mapping comprises: spacingly mapping to the frequency domain resource, where the pilot bit information and the user data information occupy discontinuous Subcarrier.

10. A receiving end, including:

a cyclic prefix removal module, configured to receive a time domain signal sent by multiple transmitting ends over a wireless channel, and remove a preset length CP from the time domain signal;

11. The receiving end according to claim 10, further comprising:

12. A method of data transmission, comprising: Each of the plurality of transmitting ends maps the user data information and the pilot bit information to be transmitted to the frequency domain resource allocated thereto according to the length of the cyclic prefix CP used by the transmitting end to obtain a frequency domain signal; wherein, The transmitting end of the preset length CP continuously maps the user data information and the pilot bit information to the frequency domain resource, and uses the transmitting end of the CP of the preset length to use the user data information and the pilot Bit information is non-continuously mapped to the frequency domain resource;

Each of the transmitting ends converts the frequency domain signal into a time domain signal, and sends a CP after adding the CP in the time domain signal, where a transmitting end of the CP that is not the preset length is used in the time domain signal. Removing the time domain signal before adding the CP;

Receiving, by the receiving end, the time domain signal sent by the multiple transmitting ends, and removing the CP of the preset length from the received time domain signal;

The receiving end converts the time domain signal after the removal of the CP into a frequency domain signal; the receiving end respectively locates the frequency domain resource locations of the continuous mapping and the discontinuous mapping, and extracts user data information sent by each of the transmitting ends. And pilot bit information.

The method according to claim 12, wherein a CP that is not of the preset length includes a CP of a plurality of lengths, and for a plurality of transmitting ends that use a CP that is not the preset length, the length of the CP used is not The same length of the removed end is different when the portion of the time domain signal is removed.

The method according to claim 12 or 13, wherein, using the transmitting end of the CP of the preset length to non-continuously map the user data information and the pilot bit information to the frequency domain resource comprises:

Transmitting, by the transmitting end of the CP that is not the preset length, the user data information and the pilot bit information to the frequency domain resource, where the pilot bit information and the user data information occupy discontinuous Subcarrier.

15. A method of data transmission, including:

Each of the plurality of transmitting ends maps the user data information and the pilot bit information to be transmitted to the frequency domain resource allocated thereto according to the length of the cyclic prefix CP used, to obtain a frequency domain signal, where The transmitting end of the preset length CP continuously maps the user data information and the pilot bit information to the frequency domain resource, and uses the preset The transmitting end of the length CP maps the user data information and the pilot bit information discontinuously to the frequency domain resource;

Each of the transmitting ends converts the frequency domain signal into a time domain signal, and sends a CP after adding the CP in the time domain signal, where a transmitting end of the CP that is not the preset length is used in the time domain signal. Before the CP is added, part of the time domain signal is removed, and the length and position of the removed time domain signal correspond to the length of the CP used by the transmitting end.

16. A method of receiving data, comprising:

The receiving end receives the time domain signal sent by the multiple transmitting ends, and removes the preset length CP from the received time domain signal;

The receiving end converts the time domain signal after the CP is removed into a frequency domain signal, and extracts user data information and pilots sent by each of the transmitting ends according to the frequency domain resource positions of the continuous mapping and the discontinuous mapping, respectively. Bit information.

The method according to claim 16, wherein, after the receiving end extracts user data information and pilot bit information sent by each of the transmitting ends, the method further includes:

The receiving end performs channel estimation of the pilot bit according to the received pilot bit information and local pilot bit information, and obtains a channel estimate of the user data bit according to the channel estimation of the pilot bit;

The receiving end performs demodulation of the user information using the received user data information and channel estimation values of the user data bits.