WO2010018987A2 - 다중 반송파 시스템에서 데이터 전송 방법 및 전송기 - Google Patents
다중 반송파 시스템에서 데이터 전송 방법 및 전송기 Download PDFInfo
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- WO2010018987A2 WO2010018987A2 PCT/KR2009/004489 KR2009004489W WO2010018987A2 WO 2010018987 A2 WO2010018987 A2 WO 2010018987A2 KR 2009004489 W KR2009004489 W KR 2009004489W WO 2010018987 A2 WO2010018987 A2 WO 2010018987A2
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- 238000000034 method Methods 0.000 title claims description 19
- 239000000969 carrier Substances 0.000 claims abstract description 51
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- 238000004891 communication Methods 0.000 description 14
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- 101000741965 Homo sapiens Inactive tyrosine-protein kinase PRAG1 Proteins 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0027—Scheduling of signalling, e.g. occurrence thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0602—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using antenna switching
- H04B7/0604—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using antenna switching with predefined switching scheme
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0026—Transmission of channel quality indication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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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
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0023—Time-frequency-space
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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
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
- H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
- H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
- H04B2201/70706—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation with means for reducing the peak-to-average power ratio
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Definitions
- the present invention relates to wireless communications, and more particularly, to an apparatus and method for supporting multiple carriers.
- Wireless communication systems are widely deployed to provide various kinds of communication services such as voice and data.
- a wireless communication system is a multiple access system capable of supporting communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.).
- multiple access systems include code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, time division multiple access (TDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, and single carrier frequency (SC-FDMA). division multiple access) system.
- CDMA code division multiple access
- FDMA frequency division multiple access
- TDMA time division multiple access
- OFDMA orthogonal frequency division multiple access
- SC-FDMA single carrier frequency division multiple access
- SC-FDMA has almost the same complexity as OFDMA, but has a lower peak-to-average power ratio (PAPR) due to the single carrier property. Since low PAPR is beneficial to the UE in terms of transmission power efficiency, SC-FDMA is a 3rd Generation Partnership Project (3GPP) TS 36.211 V8.2.0 (2008-03) "Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E- UTRA); physical channels and modulation (Release 8) ", is adopted for uplink transmission in 3GPP long term evolution (LTE).
- 3GPP 3rd Generation Partnership Project
- Wireless communication systems generally use one bandwidth for data transmission.
- the second generation wireless communication system uses a bandwidth of 200KHz ⁇ 1.25MHz
- the third generation wireless communication system uses a bandwidth of 5MHz ⁇ 10MHz.
- next-generation wireless systems continue to expand their bandwidth to 20 MHz or more.
- a multi-carrier system has emerged that defines a carrier having one bandwidth and a center frequency and enables data transmission and / or reception over a wide range of carriers over a plurality of carriers.
- both narrow and wide bandwidths are supported simultaneously. For example, if one carrier corresponds to a bandwidth of 5 MHz, four carriers are used to support a maximum bandwidth of 20 MHz.
- SC-FDMA the efficiency of a power amplifier due to low PAPR can be improved.
- it is not disclosed how to configure SC-FDMA in a multi-carrier system can maintain a low PAPR.
- the present invention provides a transmitter and method for supporting SC-FDMA in a multi-carrier system.
- the present invention also provides a transmitter and method having a low PAPR in a multi-carrier system.
- a transmitter in a multi-carrier system, includes a plurality of transmit antennas, a processor for processing user data, and a single carrier frequency division multiple access (SC-FDMA) that receives the user data and is transmitted through the plurality of transmit antennas.
- SC-FDMA signal generator for generating symbols.
- the SC-FDMA signal generator may independently perform inverse fast fourier transform (IFFT) on each of the plurality of transmit antennas, and each of the plurality of transmit antennas may be associated with each of a plurality of carriers.
- IFFT inverse fast fourier transform
- the SC-FDMA signal generator is configured to perform at least one DFT unit for performing Discrete Fourier Transform (DFT) on the user data to generate DFT spread symbols, and perform an IFFT on the DFT spread symbols to perform the SC- It may include a plurality of IFFT unit for generating FDMA symbols, each disposed in the plurality of transmit antennas.
- the SC-FDMA signal generator may further include a subcarrier mapper disposed between the DFT unit and the plurality of IFFT units.
- a data transmission method in a multi-carrier system is to spread the user data by the Discrete Fourier Transform (DFT) to generate DFT spread symbols, to generate a control sequence corresponding to the control data from the base sequence, and to the Discrete DFT (discrete) Fourier Transform) Performs a first inverse fast Fourier transform (IFFT) on the spread symbols to transmit through a first transmit antenna, and performs a second IFFT independently of the first IFFT on the control sequence to perform a second Transmitting via a transmit antenna.
- DFT Discrete Fourier Transform
- IFFT inverse fast Fourier transform
- 1 shows a wireless communication system.
- FIG. 2 shows a structure of a radio frame in 3GPP LTE.
- 3 is an exemplary diagram showing a resource grid for one uplink slot in 3GPP LTE.
- 5 is an exemplary diagram illustrating a multi-carrier.
- FIG. 6 is a block diagram illustrating an example of a SC-FDMA signal generator according to the prior art.
- FIG. 7 is a block diagram illustrating a transmitter supporting SC-FDMA according to an embodiment of the present invention.
- FIG. 8 is a block diagram illustrating an SC-FDMA signal generator according to an embodiment of the present invention.
- FIG. 9 is a block diagram illustrating an SC-FDMA signal generator according to another embodiment of the present invention.
- FIG. 10 is a block diagram illustrating an SC-FDMA signal generator according to another embodiment of the present invention.
- FIG. 11 is a block diagram illustrating an SC-FDMA signal generator according to another embodiment of the present invention.
- FIG. 12 is a block diagram illustrating an SC-FDMA signal generator according to another embodiment of the present invention.
- FIG. 13 is a block diagram illustrating an SC-FDMA signal generator according to another embodiment of the present invention.
- FIG. 14 is a block diagram illustrating an SC-FDMA signal generator according to another embodiment of the present invention.
- 15 is a block diagram illustrating an SC-FDMA signal generator according to another embodiment of the present invention.
- 16 is a block diagram illustrating an SC-FDMA signal generator according to another embodiment of the present invention.
- 17 is a block diagram illustrating a receiver according to an embodiment of the present invention.
- FIG. 18 is a block diagram illustrating an SC-FDMA signal generator according to an embodiment of the present invention.
- FIG. 19 is a block diagram illustrating an SC-FDMA signal generator according to another embodiment of the present invention.
- 21 shows an example of a PUSCH transmission.
- 22 shows an example of PUCCH and PUSCH transmission.
- FIG. 23 shows another example of a PUCCH and a PUSCH transmission.
- FIG. 24 shows another example of a PUCCH and a PUSCH transmission.
- the wireless communication system 10 includes at least one base station (BS) 11. Each base station 11 provides a communication service for a particular geographic area (generally called a cell) 15a, 15b, 15c. The cell can in turn be divided into a number of regions (called sectors).
- the user equipment (UE) 12 may be fixed or mobile, and may include a mobile station (MS), a user terminal (UT), a subscriber station (SS), a wireless device, a personal digital assistant (PDA), It may be called other terms such as a wireless modem and a handheld device.
- MS mobile station
- UT user terminal
- SS subscriber station
- PDA personal digital assistant
- the base station 11 generally refers to a fixed station communicating with the terminal 12, and may be referred to as other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), an access point, and the like. have.
- eNB evolved-NodeB
- BTS base transceiver system
- uplink means communication from the terminal to the base station.
- a transmitter may be part of a base station, and a receiver may be part of a terminal.
- uplink a transmitter may be part of a terminal, and a receiver may be part of a base station.
- a radio frame consists of 10 subframes, and one subframe consists of two slots. Slots in a radio frame are numbered from 0 to 19 slots.
- the time taken for one subframe to be transmitted is called a transmission time interval (TTI).
- TTI may be referred to as a scheduling unit for data transmission.
- one radio frame may have a length of 10 ms
- one subframe may have a length of 1 ms
- one slot may have a length of 0.5 ms.
- the structure of the radio frame is merely an example, and the number of subframes included in the radio frame or the number of slots included in the subframe may be variously changed.
- the uplink slot includes a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain and N UL resource blocks (RBs) in the frequency domain.
- the OFDM symbol is for representing one symbol period.
- the OFDM symbol may be a multiple access scheme such as OFDMA, SC-FDMA, clustered SC-FDMA, or N ⁇ SC-FDMA, and may be referred to as an SC-FDMA symbol, an OFDMA symbol, or a symbol interval according to a system.
- the resource block includes a plurality of subcarriers in the frequency domain.
- the number NUL of resource blocks included in an uplink slot depends on an uplink transmission bandwidth set in a cell.
- Each element on the resource grid is called a resource element.
- Resource elements on the resource grid may be identified by an index pair (k, l) in the slot.
- an exemplary resource block includes 7 ⁇ 12 resource elements including 7 OFDM symbols in the time domain and 12 subcarriers in the frequency domain, but the number of subcarriers and the OFDM symbols in the resource block is equal to this. It is not limited. The number of OFDM symbols or the number of subcarriers included in the resource block may be variously changed.
- the resource block means a general frequency resource. In other words, if the resource blocks are different, the frequency resources are different.
- the number of OFDM symbols may change depending on the length of a cyclic prefix (CP). For example, the number of OFDM symbols is 7 for a normal CP and the number of OFDM symbols is 6 for an extended CP.
- CP cyclic prefix
- the subframe 4 shows a structure of an uplink subframe in 3GPP LTE.
- the subframe includes a plurality of SC-FDMA symbols (or OFDM symbols) in the time domain and a plurality of subcarriers in the frequency domain.
- the subframe includes two consecutive slots in the time domain.
- the uplink subframe may be divided into a region in which a physical uplink control channel (PUCCH) carrying uplink control information is allocated in a frequency domain and a data region in which a physical uplink shared channel (PUSCH) carrying user data is allocated.
- PUCCH for one UE is allocated as an RB pair in a subframe, and RBs belonging to the RB pair occupy different subcarriers in each of two slots. This is said that the RB pair allocated to the PUCCH is frequency hopping at the slot boundary.
- Spectrum aggregation (or bandwidth aggregation, also called carrier aggregation) is to support a plurality of carriers.
- Carrier is defined as bandwidth and center frequency.
- Spectral aggregation is introduced to support increased throughput, to prevent cost increases due to the introduction of wideband radio frequency (RF) devices, and to ensure compatibility with existing systems. For example, if four carriers are allocated as granularity in a carrier unit having a 5 MHz bandwidth, a maximum bandwidth of 20 MHz may be supported.
- RF radio frequency
- Spectral aggregation can be divided into contiguous spectral aggregation between continuous carriers in the frequency domain and non-contiguous spectral aggregation between discontinuous carriers.
- the number of carriers aggregated between the downlink and the uplink may be set differently. The case where the number of downlink carriers and the number of uplink carriers are the same is called symmetric aggregation, and when the number is different, it is called asymmetric aggregation.
- the size (ie bandwidth) of the multiple carriers may be different. For example, assuming that five carriers are used for the configuration of the 70 MHz band, 5 MHz carrier (carrier # 0) + 20 MHz carrier (carrier # 1) + 20 MHz carrier (carrier # 2) + 20 MHz carrier (carrier # 3) It may be configured as a + 5MHz carrier (carrier # 4).
- a multiple carrier system refers to a system supporting multiple carriers based on spectral aggregation.
- Adjacent spectral and / or non-adjacent spectral aggregation may be used in a multi-carrier system, and either symmetric or asymmetric aggregation may be used.
- the mth carrier of the M carriers has a bandwidth of N IFFT, m ⁇ ⁇ f m .
- N IFFT, m indicates the IFFT size of the m-th carrier, ⁇ f m indicates the subcarrier spacing of the m-th carrier.
- the IFFT size and the subcarrier spacing may be different for different carriers or may be the same.
- the m-th carrier has a center frequency (f c, m) of the center (center frequency), the center frequency of each carrier may be arranged at regular intervals or irregular intervals.
- SC-FDMA Single-carrier frequency division multiple access
- DFT discrete Fourier transform
- IFFT inverse fast Fourier transform
- FIG. 6 is a block diagram illustrating an example of a SC-FDMA signal generator according to the prior art.
- the DFT size and the IFFT size are increased by the size of the extended bandwidth.
- the DFT unit 310 performs a DFT having a size corresponding to the entire bandwidth, and the subcarrier mapping unit 320 maps the frequency domain signal on which the DFT is performed to each subcarrier.
- the time domain signal generated by the IFFT unit 330 is transmitted for each carrier.
- the SC-FDMA signal generator 300 although the PAPR can be reduced according to the subcarrier mapping method, the DFT size and the IFFT size are too large, which greatly increases the complexity of the transmitter.
- a subband refers to a resource allocation unit allocated to each user, and one or more subbands may correspond to one carrier.
- the transmitter 400 includes a processor 410, an SC-FDMA signal generator 430, and a CP inserter 450.
- the processor 410 processes the input information bits to generate data symbols.
- the processor 410 performs channel coding and mapping according to modulation schemes such as binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), and quadrature amplitude modulation (m-QAM), thereby complex data symbol values. Create them.
- the data processor 410 may include a channel encoder (not shown) for performing channel coding and a mapper (not shown) for performing mapping, and may include a plurality of channel encoders and a plurality of mappers.
- the processor 410 may generate a control sequence corresponding to the control signal and / or the reference signal based on the base sequence.
- the basic sequence may be a constant amplitude zero auto-correlation (CAZAC) sequence or a pseudo-random (PN) sequence having good PAPR characteristics.
- the control sequence may be obtained in various ways, such as multiplying, transforming, cutting, and cyclic shift of the base sequence according to the control data, which will be described later.
- the SC-FDMA signal generator 430 spreads user data into a discrete fourier transform (DFT), maps it to a subcarrier, and performs an inverse fast fourier transform (IFFT) to generate a time domain signal (called an SC-FDMA symbol). .
- the SC-FDMA signal generator 430 may perform IFFT after subcarrier mapping without DFT spreading for the control sequence. This is because if the control sequence has a good PAPR characteristic, it can be regarded as a DFT spreading sequence and there is no need to perform DFT spreading again.
- the SC-FDMA signal generator 430 may perform an independent IFFT for each transmit antenna, and a detailed structure thereof will be described later.
- DFT spread frequency domain symbols may be mapped in subband units.
- the subbands may be continuous or discontinuous.
- the CP inserter 450 inserts a cyclic prefix (CP) into the SC-FDMA symbols, and the SC-FDMA symbols with the CP are inserted through Nt transmit antennas 490-1, ..., 490-Nt. Is sent.
- CP cyclic prefix
- the SC-FDMA signal generator 430 supports multiple carriers. When there are a plurality of carriers in the system bandwidth, there may be several cases as follows depending on the number M of carriers and the number Nt of transmission antennas.
- the carrier and the transmission antenna may be mapped 1: 1.
- a plurality of carriers may be mapped to one transmit antenna according to the channel state of the carrier or the transmit antenna.
- At least one transmit antenna may be mapped to multiple carriers. For example, assume that K (K ⁇ M) carriers are mapped to one transmit antenna. Even if PAPR increases due to K carriers, a transmission antenna is determined according to a specific criterion, and data for K carriers is transmitted through the determined transmission antenna. The remaining transmit antenna transmits data for other carriers. Specific criteria may use Signal-to-Interfernce Plus Noise Ratio (SINR). For example, K carriers may be mapped to a transmit antenna having the highest SINR, and remaining carriers may be mapped to another transmit antenna.
- SINR Signal-to-Interfernce Plus Noise Ratio
- the transmission antennas to which each carrier is mapped may be selected.
- transmit antennas may be mapped to different carriers.
- subcarrier mapper for subcarrier mapping is omitted between the DFT and the IFFT, but after the DFT spreading, subcarrier mapping in various ways may be performed before the IFFT is performed.
- the SC-FDMA signal generator 500 includes a first DFT unit 510a, a second DFT unit 510b, a third DFT unit 510c, a first IFFT unit 530a, a second IFFT unit 530b, and a first 3 includes IFFT unit 530c.
- SC-FDMA symbols for the first transmit antenna are generated through the first DFT unit 510a and the first IFFT unit 530a and transmitted on the first carrier.
- SC-FDMA symbols for the second transmit antenna are generated via the second DFT unit 510b and the second IFFT unit 530b and transmitted on the second carrier.
- SC-FDMA symbols for the third transmit antenna are generated via the third DFT unit 510c and the third IFFT unit 530c and are transmitted on the third carrier.
- the subcarrier mapping between the DFT and the IFFT is performed in a continuous or discontinuous subband unit, but the technical spirit of the present invention is not limited to the subcarrier mapping scheme.
- the SC-FDMA signal generator 600 includes a first DFT unit 610a, a second DFT unit 610b, a third DFT unit 610c, a first IFFT unit 630a, a second IFFT unit 630b, and a first 3 includes an IFFT unit 630c.
- the symbols spread by the first DFT unit 610a are transmitted on the first carrier through the first transmission antenna via the first IFFT unit 630a.
- the symbols spread by the second DFT unit 610b are transmitted on the second carrier through the first transmission antenna via the second IFFT unit 630b.
- the symbols spread by the third DFT unit 610c are transmitted on the third carrier through the second transmission antenna via the third IFFT unit 630c.
- the SC-FDMA signal generator 700 includes a first DFT unit 710a, a second DFT unit 710b, a third DFT unit 710c, a first IFFT unit 730a, and a second IFFT unit 730b. do.
- the number of IFFT units 730a and 730b is the same as the number of transmit antennas, but the number of DFT units 710a, 710b and 710c is larger than the number of transmit antennas.
- the symbols spread by the first DFT unit 710a and the second DFT unit 710b are transmitted on the first carrier through the first transmission antenna via the first IFFT unit 730a.
- the symbols spread by the third DFT unit 710c are transmitted on the second carrier through the second transmission antenna via the second IFFT unit 730b.
- FIG. 11 is a block diagram illustrating an SC-FDMA signal generator according to another embodiment of the present invention.
- the total system bandwidth is divided into three carriers, and the transmitter is said to include two transmit antennas.
- the first transmit antenna uses two carriers, and the second transmit antenna uses the other carrier.
- IFFT is performed independently for each transmit antenna. In the control sequence, only IFFT is performed independently and may be transmitted through each transmit antenna.
- the SC-FDMA signal generator 800 includes a first DFT unit 810a, a second DFT unit 810b, a first IFFT unit 830a, a second IFFT unit 830b, and a third IFFT unit 830c. do.
- the number of IFFT units 830a, 830b, and 803c is larger than that of the DFT units 810a and 810b.
- the user data spread by the first DFT unit 810a is transmitted on the first carrier and the second carrier through the first transmission antenna via the first IFFT unit 830a and the second IFFT unit 830b.
- some of the symbols generated by the first DFT unit 810a (which are referred to as DFT spread symbols) may be input to the first IFFT unit 830a and the other may be input to the second IFFT unit 830b.
- symbols spread by the first DFT unit 810a may be equally input to the first IFFT unit 830a and the second IFFT unit 830b, respectively.
- the symbols spread by the second DFT unit 810b are transmitted on the second carrier through the second transmission antenna via the third IFFT unit 830c.
- the SC-FDMA signal generator 900 includes a first DFT unit 910a, a second DFT unit 910b, a first IFFT unit 930a, and a second IFFT unit 930b.
- the SC-FDMA signal generator 900 performs discontinuous mapping in subcarrier mapping from DFT to IFFT.
- the symbols spread by the first DFT unit 910a are mapped to the first IFFT unit 930a, they are discontinuously mapped. Discontinuous mapping may be performed in subband units. For example, when there are three subbands, the first subband and the second subband are mapped to the first carrier, and the third subband is mapped to the second carrier. SC-FDMA symbols that have passed through the first IFFT unit 930a are transmitted on the first carrier through the first transmit antenna. The symbols spread by the second DFT unit 910b are transmitted on the second carrier through the second transmission antenna via the second IFFT unit 930b after continuous subcarrier mapping is performed.
- the SC-FDMA signal generator 1000 includes a first DFT unit 1010a, a second DFT unit 1010b, a third DFT unit 1010c, first IFFT units 1030aa and 1030ab for a first carrier, and a second Second IFFT units 1030ba and 1030bb for a carrier, and third IFFT units 1030ca and 1030cb for a third carrier.
- the symbols spread by the first DFT unit 1010a are divided into two subbands and input to the first IFFT units 1030aa and 1030ab, respectively.
- only IFFT is performed independently and may be transmitted through each transmit antenna.
- SC-FDMA symbols output from the first IFFT 1030aa are transmitted on a first carrier through a first transmit antenna
- SC-FDMA symbols output from the first IFFT 1030ab are first transmitted through a second transmit antenna. Transmitted on a carrier wave.
- the symbols spread by the second DFT unit 1010b are divided into two subbands and input to the second IFFT units 1030ba and 1030bb, respectively.
- SC-FDMA symbols output from the second IFFT 1030ba are transmitted on the second carrier through the first transmit antenna, and SC-FDMA symbols output from the second IFFT 1030bb are transmitted through the second transmit antenna. Transmitted on a carrier wave.
- the symbols spread by the third DFT unit 1010c are divided into two clusters and input to the third IFFT units 1030ca and 1030cb, respectively.
- SC-FDMA symbols output from the third IFFT 1030ca are transmitted on the third carrier through the first transmit antenna, and SC-FDMA symbols output from the third IFFT 1030cb are transmitted through the second transmit antenna. Transmitted on a carrier wave.
- signals mapped to three subbands are transmitted through a first transmit antenna, and signals mapped to the remaining three subbands are transmitted through a second transmit antenna.
- the degree of freedom of subcarrier mapping can be greatly increased without significantly increasing the PAPR of the transmitter.
- the SC-FDMA signal generator 1100 includes a first DFT unit 1110a, a second DFT unit 1110b, a first IFFT unit 1130a, and a second IFFT unit 1130b.
- the symbols spread by the first DFT unit 1110a are transmitted on a carrier wave through the first transmission antenna via the first IFFT unit 1130a.
- the symbols spread by the second DFT unit 1110b are transmitted on the carrier wave through the second transmission antenna via the second IFFT unit 1130b.
- only IFFT is performed independently and may be transmitted through each transmit antenna.
- Subbands allocated to each of the DFT units 1110a and 1110b may be mapped to the same subcarrier.
- the symbols spread by the first DFT unit 1110a are mapped from the subcarrier # 1 in the first IFFT unit 1130a.
- the symbols spread by the second DFT unit 1110b are mapped to the second.
- the subcarrier # 1 is mapped.
- the SC-FDMA signal generator 1200 includes a first DFT unit 1210a, a second DFT unit 1210b, a first IFFT unit 1230a, and a second IFFT unit 1230b.
- subbands allocated to each of the DFT units 1210a and 1210b may be mapped to different subcarriers.
- the symbols spread by the first DFT unit 1210a are mapped from the subcarrier # 1 in the first IFFT unit 1230a
- the symbols spread by the second DFT unit 1210b are mapped to the first DFT unit.
- the second IFFT unit 1230b is mapped from the subcarrier #L so as not to overlap with the subband allocated to 1210a.
- the SC-FDMA signal generator 1300 includes a first DFT unit 1310a, a second DFT unit 1310b, a first IFFT unit 1330a, and a second IFFT unit 1330b.
- some of the subbands allocated to each of the DFT units 1310a and 1310b may overlap each other, and some may be mapped to different subcarriers.
- the symbols spread by the first DFT unit 1310a are mapped from subcarrier # 1 in the first IFFT unit 1330a, and some of the symbols spread by the second DFT unit 1310b are second.
- the subcarrier # 1 is mapped, and some are mapped from the subcarrier #L in the second IFFT unit 1330b so as not to overlap with the cluster allocated to the first DFT unit 1310a.
- the receiver 1400 includes a CP remover 1410, a channel estimator 1420, an SC-FDMA demodulator 1430, and a processor 1440.
- the received signal received through the receive antenna 1490 is CP removed by the CP remover 1410.
- the channel estimator 1420 estimates a channel from the received signal.
- the channel estimator 1420 may estimate the channels of each subband set independently.
- the transmitter and the receiver may independently exchange signaling for distinguishing a subband set for performing channel estimation or use a predetermined subband set.
- the SC-FDMA demodulator 1430 performs FFT and IDFT to demodulate the received signal on which SC-FDMA modulation has been performed.
- the processor 1440 restores original data by performing demapping and channel decoding on the demodulated signal using the estimated channel.
- the channel estimator 1420 performs channel estimation on the time domain signal at the front end of the SC-FDMA demodulator 1430, but this is only an example.
- the channel estimator 1420 may be arranged after SC-FDMA demodulator 1430 or during SC-FDMA demodulation to perform channel estimation in the frequency domain.
- the SC-FDMA signal generator 1600 includes a first DFT unit 1610a, a second DFT unit 1610b, a first IFFT unit 1630a, a second IFFT unit 1630b, and a third IFFT unit 1630c. do.
- SC-FDMA symbols for the first transmit antenna are generated by the control sequence via the first IFFT unit 1630a and transmitted on the first carrier.
- SC-FDMA symbols for the second transmit antenna are data symbols are generated via the first DFT unit 1610a and the second IFFT unit 1630b and transmitted on the second carrier.
- SC-FDMA symbols for the third transmit antenna are generated through the second DFT unit 1610b and the third IFFT unit 1630c, and transmitted on the third carrier.
- Control sequence is generated based on a sequence having good PAPR characteristics and carries control data.
- Control data includes a channel quality indicator (CQI), a hybrid automatic repeat request (HARQ) ACK / NACK, a rank indicator (RI), a precoding matrix indicator (PMI), and the like.
- CQI channel quality indicator
- HARQ hybrid automatic repeat request
- RI rank indicator
- PMI precoding matrix indicator
- control sequence is called a control sequence in that it carries control data, but the technical idea of the present invention is not limited to the control sequence.
- the spirit of the present invention will be readily applicable to other signals generated based on the basic sequence, for example, a synchronization signal and a reference signal.
- the control sequence is generated to correspond to the control data from the base sequence.
- An example of the basic sequence may be represented as ru, v (n). Where u ⁇ ⁇ 0,1, ..., 29 ⁇ is a sequence group number, v is a base sequence number in the group, and n is an element index, 0 ⁇ n ⁇ M -1, M is the length of the base sequence.
- the length M of the basic sequence may be equal to the number of subcarriers included in one demodulation reference signal symbol in a subframe. For example, if one resource block includes 12 subcarriers and three resource blocks are allocated for data transmission, the length M of the base sequence is 36.
- the basic sequence ru, v (n) can be expressed as the following equation.
- b (n) can be defined as shown in the following table.
- b (n) can be defined as shown in the following table.
- the base sequence r u, v (n) may vary depending on the sequence group number u and the base sequence number v.
- the sequence group number u and the base sequence number v in the group may each change semi-statically or slot by slot.
- group hopping When the sequence group number u changes from slot to slot is called group hopping, and the basic sequence number v in the group changes from slot to slot is called sequence hopping.
- Each of group hopping and sequence hopping may be set by a higher layer of a physical layer.
- the upper layer may be RRC (Radio Resource Control) which plays a role of controlling radio resources between the terminal and the network.
- RRC Radio Resource Control
- the control sequence may use a cyclically shifted sequence from the base sequence.
- the control sequence is generated by cyclically shifting the base sequence by a specific cyclic shift amount corresponding to the control data.
- a cyclically shifted sequence r u, v (n, Ics) may be generated by performing a cyclic shift from the basic sequence r u, v (n) as shown in the following equation.
- 2 ⁇ Ics / 12 is a CS (cyclic shift) amount
- Ics is a CS index indicating a CS amount (0 ⁇ Ics ⁇ 12, and Ics is an integer).
- each IFFT or transmission antenna may be easily applied to a multi-carrier system by corresponding to each carrier.
- the SC-FDMA signal generator 1700 includes a first DFT unit 1710a, a second DFT unit 1710b, IFFT units 1730aa and 1730ab for the first carrier, and an IFFT unit 1730b for the second carrier. do. SC-FDMA symbols for the first transmit antenna are generated by the control sequence via the IFFT unit 1730aa and transmitted on the first carrier.
- the data symbols spread by the first DFT unit 1710a are IFFTed by the IFFT unit 1730ab and transmitted on the first carrier through the second transmission antenna.
- the same subband may be allocated to the control sequence and the data symbols transmitted on the first carrier or different subbands may be allocated.
- the data symbols spread by the second DFT unit 1710b are input to the IFFT unit 1730b.
- SC-FDMA symbols output from the IFFT unit 1730b are transmitted on the second carrier through the third transmit antenna.
- control sequences and data symbols are independently IFFT and are transmitted through different transmit antennas.
- PUCCH Physical channels
- PUSCH Physical channels
- the existing 3GPP LTE does not consider the multi-carrier at all, and prohibits simultaneous transmission of PUSCH and PUCCH in order to maintain a single carrier characteristic. Therefore, an example in which the above-described embodiment is applied to transmission of a PUCCH and a PUSCH in a multi-carrier system will be described.
- the first PUCCH 1801 is transmitted on the first carrier through the first antenna
- the second PUCCH 1802 is transmitted on the second carrier through the second antenna.
- the first PUCCH 1801 and the second PUCCH 1802 indicate that they are allocated to the same time / frequency domain, but may be allocated to different time / frequency domains.
- the plurality of PUCCHs are transmitted on different carriers through different antennas.
- the plurality of PUCCHs are transmitted through different subframes.
- transmission of different subframes means that the first subframe to which the first PUCCH belongs and the second subframe to which the second PUCCH belongs are transmitted on different antennas and / or different carriers.
- the 21 shows an example of a PUSCH transmission.
- the first PUSCH 1901 is transmitted on the first carrier through the first antenna
- the second PUSCH 1902 is transmitted on the second carrier through the second antenna.
- the plurality of PUSCHs are transmitted through different subframes.
- the 22 shows an example of PUCCH and PUSCH transmission.
- the PUCCH 2001 is transmitted on the first carrier through the first antenna, and the PUSCH 2002 is transmitted on the second carrier through the second antenna.
- PUCCH 2001 and PUSCH 2002 are transmitted on different subframes.
- FIG. 23 shows another example of a PUCCH and a PUSCH transmission. This is a case where PUCCH and PUSCH are simultaneously transmitted on one carrier in one subframe.
- the PUCCH 2101 is transmitted through the first antenna, and the PUSCH 2102 is transmitted through the second antenna.
- the PUCCH 2101 and the PUSCH 2102 are transmitted on the same carrier through different antennas in one subframe.
- the first PUCCH 2201 and the PUSCH 2202 are transmitted on the first carrier through the first antenna
- the second PUCCH 2203 is transmitted on the second carrier through the second antenna.
- the PUCCH and the PUSCH are transmitted through the first antenna
- the PUCCH and / or the PUSCH are transmitted through the second antenna.
- the number of carriers, the number of transmit antennas, the number of DFT units, the number of IFFT units, and subcarrier mapping are only examples and not limitations.
- FIG. 21 and FIG. 22 may be combined to be implemented, and a plurality of embodiments may be selectively implemented.
Abstract
Description
u | b(0),..., b(11) |
0 | -1 1 3 -3 3 3 1 1 3 1 -3 3 |
1 | 1 1 3 3 3 -1 1 -3 -3 1 -3 3 |
2 | 1 1 -3 -3 -3 -1 -3 -3 1 -3 1 -1 |
3 | -1 1 1 1 1 -1 -3 -3 1 -3 3 -1 |
4 | -1 3 1 -1 1 -1 -3 -1 1 -1 1 3 |
5 | 1 -3 3 -1 -1 1 1 -1 -1 3 -3 1 |
6 | -1 3 -3 -3 -3 3 1 -1 3 3 -3 1 |
7 | -3 -1 -1 -1 1 -3 3 -1 1 -3 3 1 |
8 | 1 -3 3 1 -1 -1 -1 1 1 3 -1 1 |
9 | 1 -3 -1 3 3 -1 -3 1 1 1 1 1 |
10 | -1 3 -1 1 1 -3 -3 -1 -3 -3 3 -1 |
11 | 3 1 -1 -1 3 3 -3 1 3 1 3 3 |
12 | 1 -3 1 1 -3 1 1 1 -3 -3 -3 1 |
13 | 3 3 -3 3 -3 1 1 3 -1 -3 3 3 |
14 | -3 1 -1 -3 -1 3 1 3 3 3 -1 1 |
15 | 3 -1 1 -3 -1 -1 1 1 3 1 -1 -3 |
16 | 1 3 1 -1 1 3 3 3 -1 -1 3 -1 |
17 | -3 1 1 3 -3 3 -3 -3 3 1 3 -1 |
18 | -3 3 1 1 -3 1 -3 -3 -1 -1 1 -3 |
19 | -1 3 1 3 1 -1 -1 3 -3 -1 -3 -1 |
20 | -1 -3 1 1 1 1 3 1 -1 1 -3 -1 |
21 | -1 3 -1 1 -3 -3 -3 -3 -3 1 -1 -3 |
22 | 1 1 -3 -3 -3 -3 -1 3 -3 1 -3 3 |
23 | 1 1 -1 -3 -1 -3 1 -1 1 3 -1 1 |
24 | 1 1 3 1 3 3 -1 1 -1 -3 -3 1 |
25 | 1 -3 3 3 1 3 3 1 -3 -1 -1 3 |
26 | 1 3 -1 -3 3 -3 1 -1 -1 3 -1 -3 |
27 | -3 -1 -3 -1 -3 3 1 -1 1 3 -3 -3 |
28 | -1 3 -3 3 -1 3 3 -3 3 3 -1 -1 |
29 | 3 -3 -3 -1 -1 -3 -1 3 -3 3 1 -1 |
u | b(0),..., b(23) |
0 | -1 3 1 -3 3 -1 1 3 -3 3 1 3 -3 3 1 1 -1 1 3 -3 3 -3 -1 -3 |
1 | -3 3 -3 -3 -3 1 -3 -3 3 -1 1 1 1 3 1 -1 3 -3 -3 1 3 1 1 -3 |
2 | 3 -1 3 3 1 1 -3 3 3 3 3 1 -1 3 -1 1 1 -1 -3 -1 -1 1 3 3 |
3 | -1 -3 1 1 3 -3 1 1 -3 -1 -1 1 3 1 3 1 -1 3 1 1 -3 -1 -3 -1 |
4 | -1 -1 -1 -3 -3 -1 1 1 3 3 -1 3 -1 1 -1 -3 1 -1 -3 -3 1 -3 -1 -1 |
5 | -3 1 1 3 -1 1 3 1 -3 1 -3 1 1 -1 -1 3 -1 -3 3 -3 -3 -3 1 1 |
6 | 1 1 -1 -1 3 -3 -3 3 -3 1 -1 -1 1 -1 1 1 -1 -3 -1 1 -1 3 -1 -3 |
7 | -3 3 3 -1 -1 -3 -1 3 1 3 1 3 1 1 -1 3 1 -1 1 3 -3 -1 -1 1 |
8 | -3 1 3 -3 1 -1 -3 3 -3 3 -1 -1 -1 -1 1 -3 -3 -3 1 -3 -3 -3 1 -3 |
9 | 1 1 -3 3 3 -1 -3 -1 3 -3 3 3 3 -1 1 1 -3 1 -1 1 1 -3 1 1 |
10 | -1 1 -3 -3 3 -1 3 -1 -1 -3 -3 -3 -1 -3 -3 1 -1 1 3 3 -1 1 -1 3 |
11 | 1 3 3 -3 -3 1 3 1 -1 -3 -3 -3 3 3 -3 3 3 -1 -3 3 -1 1 -3 1 |
12 | 1 3 3 1 1 1 -1 -1 1 -3 3 -1 1 1 -3 3 3 -1 -3 3 -3 -1 -3 -1 |
13 | 3 -1 -1 -1 -1 -3 -1 3 3 1 -1 1 3 3 3 -1 1 1 -3 1 3 -1 -3 3 |
14 | -3 -3 3 1 3 1 -3 3 1 3 1 1 3 3 -1 -1 -3 1 -3 -1 3 1 1 3 |
15 | -1 -1 1 -3 1 3 -3 1 -1 -3 -1 3 1 3 1 -1 -3 -3 -1 -1 -3 -3 -3 -1 |
16 | -1 -3 3 -1 -1 -1 -1 1 1 -3 3 1 3 3 1 -1 1 -3 1 -3 1 1 -3 -1 |
17 | 1 3 -1 3 3 -1 -3 1 -1 -3 3 3 3 -1 1 1 3 -1 -3 -1 3 -1 -1 -1 |
18 | 1 1 1 1 1 -1 3 -1 -3 1 1 3 -3 1 -3 -1 1 1 -3 -3 3 1 1 -3 |
19 | 1 3 3 1 -1 -3 3 -1 3 3 3 -3 1 -1 1 -1 -3 -1 1 3 -1 3 -3 -3 |
20 | -1 -3 3 -3 -3 -3 -1 -1 -3 -1 -3 3 1 3 -3 -1 3 -1 1 -1 3 -3 1 -1 |
21 | -3 -3 1 1 -1 1 -1 1 -1 3 1 -3 -1 1 -1 1 -1 -1 3 3 -3 -1 1 -3 |
22 | -3 -1 -3 3 1 -1 -3 -1 -3 -3 3 -3 3 -3 -1 1 3 1 -3 1 3 3 -1 -3 |
23 | -1 -1 -1 -1 3 3 3 1 3 3 -3 1 3 -1 3 -1 3 3 -3 3 1 -1 3 3 |
24 | 1 -1 3 3 -1 -3 3 -3 -1 -1 3 -1 3 -1 -1 1 1 1 1 -1 -1 -3 -1 3 |
25 | 1 -1 1 -1 3 -1 3 1 1 -1 -1 -3 1 1 -3 1 3 -3 1 1 -3 -3 -1 -1 |
26 | -3 -1 1 3 1 1 -3 -1 -1 -3 3 -3 3 1 -3 3 -3 1 -1 1 -3 1 1 1 |
27 | -1 -3 3 3 1 1 3 -1 -3 -1 -1 -1 3 1 -3 -3 -1 3 -3 -1 -3 -1 -3 -1 |
28 | -1 -3 -1 -1 1 -3 -1 -1 1 -1 -3 1 1 -3 1 -3 -3 3 1 1 -1 3 -1 -1 |
29 | 1 1 -1 -1 -3 -1 3 -1 3 -1 1 3 1 -1 3 1 3 -3 -3 1 -1 -1 1 3 |
Claims (12)
- 다중 반송파 시스템에서 전송기에 있어서,복수의 전송 안테나;사용자 데이터를 처리하는 프로세서; 및상기 사용자 데이터를 입력받아 상기 복수의 전송 안테나를 통해 전송되는 SC-FDMA(single carrier frequency division multiple access) 심벌들을 생성하는 SC-FDMA 신호 생성기를 포함하되, 상기 SC-FDMA 신호 생성기는 상기 복수의 전송 안테나 각각에 대해 독립적으로 IFFT(inverse Fast Fourier Transform)를 수행하고, 상기 복수의 전송 안테나 각각은 복수의 반송파 각각에 연관되는 전송기.
- 제 1 항에 있어서,상기 SC-FDMA 신호 생성기는상기 사용자 데이터에 대해 DFT(discrete Fourier Transform)을 수행하여 DFT 확산된 심벌들을 생성하는 적어도 하나의 DFT부와,상기 DFT 확산된 심벌들에 대해 IFFT를 수행하여 상기 SC-FDMA 심벌들을 생성하고, 상기 복수의 전송 안테나에 각각 배치되는 복수의 IFFT부를 포함하는 것을 특징으로 하는 전송기.
- 제 1 항에 있어서,상기 SC-FDMA 신호 생성기는 상기 DFT부와 상기 복수의 IFFT부 사이에 배치되는 부반송파 맵퍼를 더 포함하는 것을 특징으로 하는 전송기.
- 제 1 항에 있어서,상기 프로세서는 기본 시퀀스로부터 제어 데이터에 해당되는 제어 시퀀스를 생성하고,상기 SC-FDMA 신호 생성기는 입력되는 상기 제어 시퀀스에 대해 IFFT를 수행하여 SC-FDMA 심벌을 생성하는 것을 특징으로 하는 전송기.
- 제 4 항에 있어서,상기 제어 데이터는 PUCCH(Physical Uplink Control Channel) 상으로 전송되고, 상기 사용자 데이터는 PUSCH(Physical Uplink Shared Channel) 상으로 전송되는 것을 특징으로 하는 전송기.
- 제 5 항에 있어서,상기 PUCCH와 PUSCH는 주파수 영역에서 서로 다른 부반송파에 할당되는 것을 특징으로 하는 전송기.
- 제 5 항에 있어서,상기 PUCCH와 PUSCH는 동시에 전송되는 것을 특징으로 하는 전송기.
- 다중 반송파 시스템에서 데이터 전송 방법에 있어서,사용자 데이터를 DFT(discrete Fourier Transform) 확산시켜 DFT확산된 심벌들을 생성하고,기본 시퀀스로부터 제어 데이터에 해당되는 제어 시퀀스를 생성하고,상기 DFT(discrete Fourier Transform) 확산된 심벌들에 대해 제1 IFFT(inverse Fast Fourier Transform)를 수행하여 제1 전송 안테나를 통해 전송하고,상기 제어 시퀀스에 대해 상기 제1 IFFT와 독립적으로 제2 IFFT를 수행하여 제2 전송 안테나를 통해 전송하는 것을 포함하는 방법.
- 제 8 항에 있어서,상기 제1 전송 안테나는 제1 반송파와 연관되고, 상기 제2 전송 안테나는 제2 반송파와 연관되는 것을 특징으로 하는 방법.
- 제 8 항에 있어서,상기 제어 시퀀스는 PUCCH(Physical Uplink Control Channel) 상으로 전송되고, 상기 DFT 확산된 심벌들은 PUSCH(Physical Uplink Shared Channel) 상으로 전송되는 것을 특징으로 하는 방법.
- 제 10 항에 있어서,상기 PUCCH와 PUSCH는 주파수 영역에서 서로 다른 부반송파에 할당되는 것을 특징으로 하는 방법.
- 제 10 항에 있어서,상기 제어 시퀀스는 상기 기본 시퀀스를 상기 제어 데이터에 해당되는 순환쉬프트 양만큼 순환 쉬프트시켜 생성되는 것을 특징으로 하는 방법.
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US12/865,102 US8345618B2 (en) | 2008-08-12 | 2009-08-12 | Data transmission method in a multi-carrier system, and transmitter |
CA2730717A CA2730717C (en) | 2008-08-12 | 2009-08-12 | Data transmission method in a multi-carrier system, and transmitter |
GB1102012A GB2475436A (en) | 2008-08-12 | 2009-08-12 | Data transmission method in a multi-carrier system. and transmitter |
MX2011001710A MX2011001710A (es) | 2008-08-12 | 2009-08-12 | Metodo de transmision de datos en un sistema de portadores multiples y transmisor. |
AU2009280459A AU2009280459B2 (en) | 2008-08-12 | 2009-08-12 | Data transmission method in a multi-carrier system, and transmitter |
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US20110002322A1 (en) | 2011-01-06 |
GB201102012D0 (en) | 2011-03-23 |
AU2009280459B2 (en) | 2013-01-17 |
CA2730717A1 (en) | 2010-02-18 |
KR100983958B1 (ko) | 2010-09-27 |
GB2475436A (en) | 2011-05-18 |
CA2730717C (en) | 2015-08-04 |
AU2009280459A1 (en) | 2010-02-18 |
AU2009280459A2 (en) | 2011-01-27 |
US8345618B2 (en) | 2013-01-01 |
KR20100071095A (ko) | 2010-06-28 |
MX2011001710A (es) | 2011-03-30 |
WO2010018987A3 (ko) | 2010-06-17 |
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