WO2007022715A1 - Procede, systeme et terminal de multiplexage de pilote de liaison ascendante d'apres l'acces multiple par repartition en frequence a simple porteuse - Google Patents

Procede, systeme et terminal de multiplexage de pilote de liaison ascendante d'apres l'acces multiple par repartition en frequence a simple porteuse Download PDF

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Publication number
WO2007022715A1
WO2007022715A1 PCT/CN2006/002147 CN2006002147W WO2007022715A1 WO 2007022715 A1 WO2007022715 A1 WO 2007022715A1 CN 2006002147 W CN2006002147 W CN 2006002147W WO 2007022715 A1 WO2007022715 A1 WO 2007022715A1
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Prior art keywords
symbol
user terminal
pilot
subcarriers
occupied
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PCT/CN2006/002147
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English (en)
Chinese (zh)
Inventor
Sha Ma
Yujuan He
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Huawei Technologies Co., Ltd.
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Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to CN2006800168203A priority Critical patent/CN101176285B/zh
Publication of WO2007022715A1 publication Critical patent/WO2007022715A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H04L25/0226—Channel estimation using sounding signals sounding signals per se
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H04L25/0228—Channel estimation using sounding signals with direct estimation from sounding signals
    • H04L25/023—Channel estimation using sounding signals with direct estimation from sounding signals with extension to other symbols
    • H04L25/0232—Channel estimation using sounding signals with direct estimation from sounding signals with extension to other symbols by interpolation between sounding signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a method and system for uplink pilot multiplexing based on single carrier frequency division multiple access, and a user terminal. Background technique
  • Multi-carrier technology has become a hotspot technology for broadband wireless communication.
  • the basic idea is to divide a wideband carrier into multiple subcarriers and transmit data in parallel on multiple subcarriers.
  • the width of the subcarrier is smaller than the coherence bandwidth of the channel, so that the fading of each subcarrier is flat fading on the frequency selective channel, which can reduce crosstalk between data symbols, and does not require complicated channel equalization, and is suitable for high rate.
  • Multi-carrier technology usually uses frequency domain channel estimation techniques and frequency domain equalization techniques.
  • Some single-carrier systems can also perform a single-carrier system equivalent to a system composed of multiple parallel sub-carriers by performing Fourier Transformation (FFT) at the receiving end for frequency domain channel estimation and frequency domain equalization processing.
  • FFT Fourier Transformation
  • the frequency domain channel estimation usually adopts a coherent demodulation method based on auxiliary information, and some known pilot symbols or training sequences are inserted at some fixed positions of the signal transmitted by the transmitting end, and the pilot signals are used according to an algorithm at the receiving end.
  • the system has a time-frequency two-dimensional structure (instant domain and frequency domain), so the pilot symbol design used here should take into account the time-frequency two-dimensional correlation characteristics of the channel as much as possible.
  • the channel transmission function of the inserted pilot symbol position can be better estimated at the receiving end, and then adopted.
  • a two-dimensional interpolation method is used to estimate the channel response of all data symbol positions. Therefore, the design of the inserted pilot symbols is increasingly becoming a key issue in systems employing frequency domain channel estimation and frequency domain equalization processing.
  • the peak-to-average ratio of the transmitted power is a non-negligible problem, which directly affects the effectiveness and power consumption characteristics of the user terminal power amplifier.
  • the existing single-carrier frequency division multiple access technology compares the peak-to-average ratio of the transmitted power by carrying the signal on the time domain waveform Low; At the same time, the time-frequency resources occupied by different users also do not intersect each other, so that the interference between different users in the cell can be reduced.
  • Single-carrier technology can be implemented by time domain processing or by frequency domain processing.
  • time domain processing is called Interleaved Frequency Division Multiple Access (IFDMA); its frequency domain processing
  • DFT-S-OFDMA Discrete Fourier Transform
  • Time domain waveform The difference between the two implementations lies in the processing of the transmitted data, wherein the IFDMA based on time domain processing implements the comb spectrum in the frequency domain by repetition of the time domain; and the DFT-S-OFDMA based on the frequency domain processing Then, the comb ⁇ is constructed directly according to the frequency domain feature, and then the time domain waveform is formed by the inverse fast Fourier transform (IFFT) processing.
  • IFFT inverse fast Fourier transform
  • the Q data symbols of a certain user i may be a real number or a complex number to form a data block block, wherein each data symbol has a duration of 7 and a data block block of the user.
  • d(') [Ci'), '" ⁇ ] 7 (where ⁇ represents the matrix transpose)
  • ⁇ represents the matrix transpose
  • the times represents the number of repetitions of the data block block, and the data symbols after the repeated processing can be further expressed as:
  • the sequence of data symbols thus obtained after repeated processing appears as a set of comb-like frequency patterns on the frequency axis, as shown in FIG.
  • the obtained phase vector of the user i is multiplied by the element obtained as described above, and finally the useful data portion of the transmitted signal of the user i is:
  • ⁇ ⁇ represents the added guard time value
  • raax represents the maximum multipath delay spread of the channel
  • the comb spectrum of multiple users needs to be separated, and the respective repeated data symbols are combined; at the same time, a frequency domain equalizer needs to be introduced to resist the data symbols in the data block caused by the wireless transmission process.
  • a frequency domain equalizer needs to be introduced to resist the data symbols in the data block caused by the wireless transmission process.
  • ISI Interfere with ISI.
  • the maximum number of multiplexed users that can be supported by the single-carrier frequency division multiplexing system implemented by IFDMA will not exceed the number of repetitions of its data blocks.
  • the implementation principle of the existing DFT-S-OFDMA is as follows: The transmitting end first performs the discrete Fourier transform (DFT, Discrete Fourier Transform) processing on the transmitted time domain data, that is, performs pre-transmission time domain data. Precoding "operation; then frequency domain windowing of the DFT processed frequency domain data to further reduce the peak-to-average ratio of the pre-transmitted time domain data (this process is optional); then the frequency domain according to a predetermined mapping rule The data is mapped to a wider frequency band, and finally the inverse frequency inverse Fourier transform (IFFT) is performed on the mapped frequency domain data to obtain a corresponding time domain waveform.
  • DFT discrete Fourier transform
  • IFFT inverse frequency inverse Fourier transform
  • the key step in this process is the mapping of frequency domain data, if DFT and IFFT The number of transformation points is equal, then the mapping is - corresponding, at this time DFT processing and IFFT processing completely canceled, equivalent to a single carrier link; and if the length of the DFT is smaller than IFFT, then it needs to be processed by equal interval , which is:
  • each X[m] in the matrix represents a DFT transform.
  • the obtained frequency domain samples are distinguished by different frequency domain subcarrier offsets, which is equivalent to the user phase rotation in the IFDMA system.
  • the time domain waveform processed by the above process also needs to be operated by adding CP.
  • the corresponding after removing the CP at the receiving end, the corresponding first needs to perform FFT processing on the data after removing the CP, and then separate the comb spectrum of different users according to the mapping rule of the transmitting end, and then perform IDFT after frequency domain equalization processing. To obtain time domain data required for demodulation processing. Similarly, the maximum number of multiplexed users that can be supported by the single-carrier frequency division multiple access system implemented by the frequency domain processing method will not exceed the number of repetitions L of its data blocks.
  • each user needs at least one subcarrier system (ie, a "comb tooth" of a set of frequency subcarriers) through frequency domain subcarrier mapping processing.
  • the subcarriers are distributed over the entire frequency band. From the frequency point of view, when the user's signal symbols are transmitted through the actual channel, they experience different frequency fading, and thus have the effect of frequency diversity.
  • each user is required to provide uplink symbols to the receiver for frequency domain channel estimation, and is transmitted in a single carrier frequency division multiple access system.
  • the signal uses time domain waveforms to carry information, and in order to avoid causing excessive peak-to-average ratio, a method of time-division multiplexing of pilot symbols and data symbols is selected.
  • pilot symbols also needs to consider the problem of efficiency.
  • the principle of design is that the resources of pilot symbols occupy less than 20% of all symbol resources (sum of pilot symbols and data symbols); and in order to track time-varying Channel, if the user's moving speed is relatively high, when a transmission time interval (TTI, Transmission Time Interval) is 0.5ms or longer, multiple scattered pilot symbols are needed in one TTI, obviously
  • TTI Transmission Time Interval
  • the structure in which the pilot symbols are shorter than the data symbols easily meets the requirements of the above conditions: It is possible to ensure that the occupancy of the symbol resources is low and the time-varying channel can be tracked.
  • the pilot symbol is set to half the length of the data symbol, which is called "half symbol pilot", as shown in FIG. 3, which is a typical half symbol pilot.
  • the half symbol pilot mode brings other problem.
  • the length of time determines the granularity of the digital frequency in the frequency domain.
  • the pilot symbols and the data symbols are not equal in length, which will cause the pilot symbols of the user and the frequency components of the data symbols in the frequency domain to be out of phase. correspond. That is, after transmission over the wireless channel, the pilot symbols are not able to directly provide fading information experienced by all frequency components of the data symbols, which may affect the demodulation performance of the received signal symbols. The reasons for this defect will be specifically explained below:
  • FFT/IFFT transform pairs are commonly used to represent the time domain waveform and frequency domain representation of signal symbols, namely:
  • the data symbol and the pilot symbol have different phase rotation factors: the phase of the user i data portion
  • the phase rotation factor of the pilot portion of the half symbol length is:
  • the frequency component contained in the pilot portion shown in the above formula is half of the data portion, and since the length of the pilot symbol is exactly half of the data symbol, the frequency component interval of the pilot symbol is exactly the data symbol frequency component interval. Twice, that is, the subcarrier spacing is not the same, as shown in Figure 4.
  • the pilot signal symbol X will be received first. (i) performing an FFT transform into the frequency domain, the transform length is
  • Frequency domain channel estimation is performed by using a known transmitted pilot signal to obtain ⁇ £ frequency points; then the channel obtained by estimating the frequency domain channel is subjected to IFFT transform into the time domain, and the transform length is
  • the obtained channel frequency response can be used to calculate the coefficients of the frequency domain equalizer, thereby performing frequency domain equalization processing on the received data signal symbols.
  • the invention provides an uplink pilot frequency multiplexing method based on single carrier frequency division multiple access, so as to reduce pilot subcarrier spacing occupied by pilot symbols in the frequency domain, thereby obtaining better interpolation processing effect and improving channel estimation.
  • the accuracy is a measure of the accuracy of the uplink pilot frequency multiplexing method based on single carrier frequency division multiple access.
  • the present invention also proposes an uplink pilot multiplexing system based on single carrier frequency division multiple access and a user terminal thereof.
  • An uplink pilot multiplexing method based on single carrier frequency division multiple access includes the following steps:
  • the user terminal occupies several subcarriers in one symbol for pilot signal transmission;
  • Pilot signal transmission is performed in at least one other symbol occupying a plurality of subcarriers interleaved with the subcarriers existing in the previous symbol; the symbols are time division multiplexed with the symbol of the user terminal transmitting the data signal.
  • the length of each symbol is less than the length of time that the user terminal transmits the symbol of the data signal.
  • the frequency band in which the plurality of subcarriers respectively occupied by the user terminal in the respective symbols overlaps with the frequency band occupied by the user terminal in the symbol of the transmitted data signal.
  • a user terminal based on single carrier frequency division multiple access comprising: Means for occupying a number of subcarriers in one symbol and occupying a number of subcarriers interleaved with a subcarrier presence position occupied in the previous symbol in at least one other symbol; and
  • An uplink pilot multiplexing method based on single carrier frequency division multiple access includes the following steps:
  • the network side divides each user terminal that participates in uplink pilot multiplexing into different user terminal groups; and separately allocates pilot multiplexing resources for each user terminal group;
  • the network side allocates the pilot multiplexing resources allocated to each user terminal group to each user terminal in the group respectively;
  • Each user terminal occupies a plurality of subcarriers in a specified symbol for pilot signal transmission according to a pilot multiplex resource indication delivered by the network side;
  • Pilot signal transmission is performed in at least one other symbol occupying a plurality of subcarriers that are not identical to the subcarriers occupied in the designated symbol; the symbols are time division multiplexed with the symbol of the user terminal transmitting the data signal.
  • each user terminal performs cyclic shift of the same shift amount for each subcarrier in each of at least another symbol with reference to each subcarrier position occupied in the designated symbol;
  • Each subcarrier determined later performs pilot signal transmission.
  • the frequency band in which the plurality of subcarriers respectively occupied by the user terminal in the respective symbols overlaps with the frequency band occupied by the user terminal in the symbol of the transmitted data signal.
  • An uplink pilot multiplexing system based on a single carrier frequency division multiple access comprising a network side and a user terminal side, wherein the network side includes:
  • the user terminal side includes: Means for occupying several subcarriers in a specified symbol according to a pilot multiplexing resource indication delivered by the network side, and occupying a plurality of subcarriers that are not identical to the subcarriers occupied in the specified symbol in at least one other symbol ; with
  • the unit for occupying the subcarrier in each symbol in the user terminal performs the same shift amount for each subcarrier in each of the at least one other symbol with the position of each subcarrier occupied in the designated symbol as a reference. Cyclic shift, and occupy each subcarrier determined after shifting.
  • the frequency band in which the plurality of subcarriers respectively occupied by the unit for occupying the subcarrier in each symbol in the respective symbols overlaps with the frequency band occupied by the user terminal in the symbol for transmitting the data signal.
  • the technical solution of the present invention mainly enables the user terminal to perform pilot signal transmission in a plurality of symbols (these symbols are time-division multiplexed with the symbol of the user terminal transmitting the data signal), by occupying a plurality of subcarriers in which the positions are staggered.
  • the user terminal may occupy a number of subcarriers that meet the requirements on the symbols, or may occupy a number of subcarriers that meet the requirements on the symbols under the indication of the network side.
  • the user performs frequency domain multiplexing on multiple pilot symbols, and the receiving end combines the pilot subcarriers on multiple symbols to reduce the occupation of the pilot.
  • the frequency subcarrier average interval thereby increasing the frequency domain sampling rate, thereby improving the effectiveness of frequency domain channel estimation and interpolation processing, and the accuracy of channel estimation.
  • Figure 1 is a schematic diagram showing the shape of a comb-like spectrum of a sequence of data symbols obtained after repeated processing of a data block on a frequency axis;
  • 2 is a schematic diagram of an implementation principle of an existing DFT-S-OFDMA
  • FIG. 3 is a schematic diagram of a typical TTI structure using a half symbol pilot
  • FIG. 4 is a frequency component interval of a data symbol after using a half symbol pilot and a frequency of a pilot symbol. Schematic diagram of the relationship between component intervals;
  • FIG. 5 is a flowchart of a main implementation principle of a pilot multiplexing method based on a single carrier frequency division multiple access technique according to the present invention
  • FIG. 6 is a flowchart of a main implementation principle of a second pilot multiplexing method based on single carrier frequency division multiple access (OFDM) technology according to the present invention
  • FIG. 7 is a schematic diagram of a first example multiplexing manner of data symbols and pilot symbols given by four users in accordance with the principle of the method of the present invention
  • FIG. 8 is a schematic diagram of a second example multiplexing manner of data symbols and pilot symbols given by four users in accordance with the principle of the method of the present invention
  • FIG. 9 is a schematic diagram of a third example multiplexing manner of data symbols and pilot symbols given by four users in accordance with the principle of the method of the present invention.
  • FIG. 10 is a schematic diagram of a fourth example multiplexing manner of data symbols and pilot symbols given by taking six users and three pilots as an example according to the principle of the method of the present invention
  • FIG. 11 is a schematic diagram of a fifth example multiplexing manner of data symbols and pilot symbols given by taking 6 users and 3 pilots as an example according to the principle of the method of the present invention. detailed description
  • the design of the present invention is to provide a scheme in which multiple users can frequency-multiplex multiplex pilot symbols, so that the interval between pilot sub-carriers in the frequency domain of pilot symbols becomes smaller, so as to obtain a better channel. Estimate the effect of interpolation processing.
  • FIG. 5 is a flowchart of a main implementation principle of a pilot multiplexing method based on single carrier frequency division multiple access (OFDM) technology, which is mainly used in a channel estimation period (such as a channel or Within a few TTIs, at least two pilot multiplexed processing is performed between the symbol-time multiplexed pilot symbols of the data signal transmitted by the user, and the main implementation process is as follows: Step 10: In a single carrier frequency division multiple access system, the user terminal occupies several subcarriers in one symbol, and performs pilot signal transmission processing based on the occupied plurality of subcarriers; the symbol and the symbol of the user terminal transmitting the data signal Time division multiplexing, and the length of the symbol is smaller than the length of time for the user terminal to transmit the data signal, that is, the symbol used for transmitting the pilot signal and the symbol for transmitting the data signal do not overlap in the time domain, and are smaller than The length of time the user sends the symbol of the data signal.
  • OFDM single carrier frequency division multiple
  • Step 20 The user terminal occupies a plurality of subcarriers interleaved with the subcarrier existence position occupied in the foregoing symbol in at least another symbol, and performs a transmission process of the pilot signal based on the occupied several subcarriers;
  • the relationship between each symbol and the symbol of the user terminal transmitting the data signal is the same as described above, that is, each symbol does not overlap with the symbol for transmitting the data signal in the time domain, and is smaller than the length of time that the user transmits the symbol of the data signal.
  • the frequency band in which the plurality of subcarriers occupied by the user terminal in the symbol for transmitting the pilot signal may overlap with the frequency band occupied by the user terminal in the symbol for transmitting the data signal.
  • FIG. 6 is a flowchart of a main implementation principle of a second pilot multi-frequency frequency division multiple access based pilot multiplexing method according to the present invention, which relates to multiple participating pilot multiplexing on the network side.
  • the user terminal performs the process of grouping, and the user terminal in the group performs pilot multiplexing processing according to the indication of the network side.
  • the main implementation process is as follows:
  • Step 100 The network side divides each user terminal that participates in uplink pilot multiplexing into different user terminal groups.
  • Step 110 The network side separately allocates corresponding pilot multiplexing resources for each of the user terminal groups separated by the foregoing;
  • Step 120 The network side separately distributes the pilot multiplexing resources allocated to each user terminal group to each user terminal in the corresponding group;
  • Step 130 Each user terminal first occupies several subcarriers in a specified symbol according to the pilot multiplexing resource indication information sent by the network side, and performs pilot signal transmission processing based on the occupied subcarriers;
  • the specified symbol does not overlap with the symbol of the user terminal transmitting the data signal in the time domain (instant time multiplexing).
  • Step 140 The network side performs, in at least another symbol, a transmission process of a pilot signal by using a plurality of subcarriers that are not identical to the subcarriers occupied in the designated symbol (that is, may be completely different or partially different); preferably The user terminal may perform cyclic shift processing of the same shift amount on each subcarrier by using each subcarrier position occupied in the designated symbol as a reference on other additional symbols, and then occupy each sub-determined after the shift processing.
  • the carrier performs transmission processing of the pilot signal.
  • the relationship between each of the other symbols mentioned herein and the symbol of the user terminal transmitting the data signal is the same as described above, i.e., each symbol does not overlap with the symbol used to transmit the data signal in the time domain.
  • the frequency band in which the plurality of subcarriers occupied by the user terminal in each symbol for transmitting the pilot signal may overlap with the frequency band occupied by the user terminal in the symbol for transmitting the data signal.
  • phase rotation factor of the kth user data symbol is ⁇ ( )
  • the pilot of one half of the user length of the user is 2 ⁇ , of which
  • Medium L indicates the number of repetitions of the data block, and [J indicates rounding down.
  • the corresponding correspondence is 0, 2, 1, and 3, that is, when there are 4 users performing single-carrier frequency division multiplexing
  • the phase offsets of the 4 users in the data portion are 0, 1, respectively. 2,3, and the phase offset in the pilot portion is 0, 2, 1, 3, respectively, and the phase rotation is in two steps, which is equivalent to each of the two comb teeth in the data portion.
  • the users are grouped into two groups, and the two users alternately occupy pilot subcarriers that have spectral overlap with their own data subcarriers. That is to say, the order of user multiplexing in the data is 0, 1, 2, 3, and the order of user multiplexing in the pilot is 0, 2, 1, and 3.
  • the phase offsets of the four users are 2, 0, 3, 1, respectively, and the phase rotation is performed in twice the step size, which is equivalent to the user division of each of the two comb teeth in the data portion.
  • a group ie, user 0, 1 is a group, users 2, 3 are a group
  • users 0, 1 are interleaved with each other and the data subcarriers of user 0 have spectral overlap.
  • the frequency subcarriers, the users 2, 3 interleaved and the data subcarriers of the user 2 have spectrally overlapping pilot subcarriers; in the second pilot symbol, the two users in the same group exchange the sequences, and then interleaved and occupied
  • Corresponding pilot subcarriers ie, pilot subcarriers that are also interleaved with users 0 and 1 and have data overlaps with user 0's data subcarriers, user 2, 3 interleaved and user 2's data subcarriers have spectral overlap Pilot subcarriers).
  • FIG. 8 a schematic diagram of a multiplexing manner of a second embodiment of data symbols and pilot symbols given by taking four users as an example according to the above method of the present invention
  • the receiving end may combine the subcarriers in the two pilot symbols, which is equivalent to reducing the subcarrier spacing of the pilot symbols in the frequency domain, as shown in FIG. 7 by user 0, respectively occupying two pilot symbols.
  • the number of pilot subcarriers is half of the number of data subcarriers occupied in the data symbols.
  • the receiving end combines the pilot subcarriers of the two pilot symbols to obtain the pilot subcarrier spacing of user 0.
  • the interval of the data subcarriers is the same.
  • the receiving end does not need to perform interpolation processing.
  • interpolation processing is required, and the above prior art can be adopted.
  • the FFT interpolation algorithm performs the difference processing), and a better interpolation processing effect can be obtained.
  • FIG. 9 is a schematic diagram showing a third example multiplexing manner between data symbols and pilot symbols given by four users according to the principle of the method of the present invention; as shown in the figure, users 0 and 2 are divided.
  • users 0 and 2 alternately occupy subcarriers overlapping with data subcarriers occupied by user 2 on data symbols, respectively, between different pilot symbols
  • the user 1, 3 alternately occupying subcarriers overlapping with data subcarriers occupied by user 0 on the data symbols, respectively, between different pilot symbols.
  • the single carrier frequency division multiplexing system configures three or more pilot symbols dispersed in time for the user, the same group of users may be alternately occupied and users between the multiple pilot symbols.
  • FIG. 10 is a schematic diagram showing a fourth example multiplexing manner of data symbols and pilot symbols given by taking six users and three pilot symbols as an example according to the principle of the method of the present invention, where users 0, 1, and 2 are shown. Divided into a group, the users 3, 4, 5 are grouped into one group, and the users 0, 1, and 2 respectively occupy the spectrum overlap of the data subcarriers occupied by the data symbols on the three pilot symbols respectively. The pilot subcarriers, the users 3, 4, 5 respectively occupy the pilot subcarriers whose spectrum overlaps with the data subcarriers occupied by the users 4 and 5 on the data symbols on the 3 pilot symbols.
  • FIG. 11 is a schematic diagram of a fifth example multiplexing manner of data symbols and pilot symbols given by taking six users and three pilot symbols as an example according to the method of the present invention, where each user in pilot 2 is occupied.
  • the pilot subcarrier position is a cyclic shift of the pilot subcarrier positions in the pilot 1, and the pilot subcarrier shift amounts of different users are the same, and the pilot subcarriers occupied by the users in the pilot 3 are The location is another cyclic shift of the pilot subcarrier positions in the pilot 1.
  • each user's pilot subcarrier has a frequency domain of 3 pilot symbols. Smaller subcarrier spacing.
  • the present invention will have the ability to implement the method
  • the user terminal of the principle is also included in the protection scope, that is, in the user terminal claimed by the present invention, a unit is included, which is capable of performing the occupation of several subcarriers in one symbol and occupying the previous one in at least one other symbol.
  • the subcarriers occupied in the symbols have the processing of a plurality of subcarriers interleaved at a position, and another unit capable of performing transmission processing of pilot signals based on the respective subcarriers occupied in the respective symbols described above, wherein each of the references mentioned herein
  • the symbol used to transmit the pilot signal is time division multiplexed with the symbol of the user terminal transmitting the data signal (ie, does not overlap in the time domain).
  • the network side includes a unit for dividing each user terminal participating in uplink pilot multiplexing into different user terminal groups; a unit for separately assigning pilot multiplexing resources to each user terminal group; and for assigning to The pilot multiplexing resources of each user terminal group are respectively delivered to the units of each user terminal in the corresponding group.
  • the user terminal side includes a pilot multiplexing resource indication information that is sent according to the network side, occupies several subcarriers in a specified symbol, and occupies the subcarrier occupied in the specified symbol in at least another symbol. a unit of several subcarriers having different carriers, and a unit for transmitting pilot signals based on respective subcarriers occupied in each symbol, wherein each symbol for transmitting a pilot signal is occupied by a signal transmitted by a user terminal Symbol time division multiplexing (ie, no overlap in the time domain). Similarly, the unit for occupying subcarriers in each symbol included in the user terminal side may perform respectively on each subcarrier by using, in the at least another symbol, each subcarrier position occupied in the designated symbol as a reference. The cyclic shift of the same shift amount is implemented by occupying each subcarrier determined after the shift.

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Abstract

Ce procédé de multiplexage d'un pilote de liaison ascendante d'après l'accès multiple par répartition en fréquence à simple porteuse permet la transmission par le terminal utilisateur du signal pilote sur une pluralité de sous-porteuses au sein d'un symbole; la transmission du signal pilote sur une pluralité de sous-porteuses entrelacées avec la sous-porteuse utilisées dans le symbole précédent; le multiplexage par répartition temporelle du signal avec le symbole, le terminal utilisateur transmettant le signal de données. Le terminal utilisateur peut transmettre le signal pilote sur une pluralité de sous-porteuses au sein du symbole sous le contrôle du réseau. Parallèlement, on prévoit un terminal utilisateur et un procédé de multiplexage d'un pilote de liaison ascendante d'après l'accès multiple par répartition en fréquence à simple porteuse. Ainsi, l'intervalle entre les sous-porteuses occupé par le signal pilote sur la fréquence peut être réduit, avec pour effet une amélioration de l'interpolation.
PCT/CN2006/002147 2005-08-23 2006-08-23 Procede, systeme et terminal de multiplexage de pilote de liaison ascendante d'apres l'acces multiple par repartition en frequence a simple porteuse WO2007022715A1 (fr)

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CN2006800168203A CN101176285B (zh) 2005-08-23 2006-08-23 基于单载波频分多址的上行导频复用方法、系统及终端

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CN 200510092586 CN1801680A (zh) 2005-08-23 2005-08-23 基于交织频分多址的导频复用方法及其装置
CN200510092586.X 2005-08-23

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CN106034329B (zh) * 2015-03-09 2019-09-17 电信科学技术研究院 一种信号传输方法及装置
US11496990B2 (en) 2017-07-31 2022-11-08 Qualcomm Incorporated Systems and methods to facilitate location determination by beamforming of a positioning reference signal
US11777764B2 (en) 2019-03-28 2023-10-03 Qualcomm Incorporated Sounding reference signal waveform design for wireless communications
US11239967B2 (en) 2019-05-02 2022-02-01 Qualcomm Incorporated Patterns for reference signals used for positioning in a wireless communications system
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CN112751628A (zh) * 2020-12-18 2021-05-04 中国电子科技集团公司第二十研究所 一种多个有限带宽范围内梳状谱干扰信号频点确定方法
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