WO2006077620A1 - Ofdm-cdma通信システムにおける送信方法および送信装置 - Google Patents
Ofdm-cdma通信システムにおける送信方法および送信装置 Download PDFInfo
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Classifications
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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
- H04L5/0016—Time-frequency-code
- H04L5/0019—Time-frequency-code in which one code is applied, as a temporal sequence, to all frequencies
-
- 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
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0212—Channel estimation of impulse response
- H04L25/0216—Channel estimation of impulse response with estimation of channel length
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2646—Arrangements specific to the transmitter only using feedback from receiver for adjusting OFDM transmission parameters, e.g. transmission timing or guard interval length
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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
- H04L5/0058—Allocation criteria
- H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
- H04L25/0228—Channel estimation using sounding signals with direct estimation from sounding signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
Definitions
- the present invention relates to a transmission method and transmission apparatus in an OFDM-CDMA communication system, and in particular, subcarriers are grouped into subcarriers having similar or equivalent propagation environments (for example, power), and channelization codes are provided.
- the present invention relates to a transmission method and a transmission apparatus in an OFDM-CDMA communication system that transmits a subcarrier component multiplied by a subcarrier component in the same group.
- a multi-carrier communication system is attracting attention.
- the multi-carrier communication method wide-band high-speed data transmission can be realized, and the influence of frequency selective fading can be reduced by narrowing each subcarrier.
- OFDM Orthogonal Frequency Division Multiplexing
- the frequency utilization efficiency can be further increased.
- intersymbol interference can be improved. The influence can be eliminated.
- OFDM-CDMA multi-carrier CDMA
- each symbol is spread (for example, multiplied by a spread code (channelization code) of length N corresponding to the spreading factor) to create a number of subcarrier components, and the subcarrier components Are transmitted on the corresponding subcarriers.
- a spread code channelization code
- Fig. 12 shows a configuration example of a transmitter (base station) of an OFDM-CDMA communication system.
- the data modulation unit 11 modulates user transmission data and converts it into a complex baseband signal (symbol) having an in-phase component and a quadrature component.
- the time multiplexing unit 12 time-multiplexes pilots of multiple symbols (common pilots) before transmission data.
- Serial parallel converter 13 is input The data is converted into parallel data of M symbols, and each symbol is branched into N and input to the spreading unit 14.
- the spreading unit 14 includes M multiplication units 14 and 14, and each multiplication unit 14
- one branching symbol is multiplied by a length N channelization code (C1 CN) to perform spreading processing, and each channelization code chip (Cl,... ⁇ Outputs SI-SN which is a signal spread by CN).
- C1 CN channelization code
- SI-SN channelization code chip
- the spreading unit 14 spreads in the frequency direction by multiplying each of M symbols by a channelization code consisting of C1 CN.
- the channelization codes used for spreading differ for each user and control channel, and the channelization codes for each user and control use codes orthogonal to each other.
- the code multiplexing unit 15 code-multiplexes the subcarrier signal generated as described above with the subcarrier signal of another user or the control subcarrier signal generated by the same method. That is, the adding unit 15-15 of the code multiplexing unit 15 performs the subcarrier for each subcarrier.
- An IFFT (Inverse Fast Fourier Transform) unit 16 performs IFFT (inverse Fourier transform) processing on the subcarrier signals input in parallel and converts them into M ⁇ N subcarrier signal components (OFDM signals) on the time axis.
- the guard interval insertion unit 17 inserts a guard inverter of a predetermined length into the OFDM signal, the quadrature modulation unit 18 performs orthogonal modulation on the OFDM signal with the guard interval inserted, and the radio transmission unit 19 Up-conversion and high-frequency amplification are transmitted from the antenna.
- the total number of subcarriers is (number of parallel sequences M) X (spreading factor N).
- the pilot is time-multiplexed on all subcarriers, and fading compensation (channel estimation Z channel compensation) can be performed for each subcarrier on the receiving side.
- FIG. 13 is a configuration example of a receiving apparatus of the OFDM-CDMA communication system.
- Radio receiver 21 performs frequency conversion processing on the received multicarrier signal, and quadrature demodulator 22 receives the received signal. Is subjected to orthogonal demodulation processing.
- the timing synchronization / guard interval removal unit 23 removes the guard interval GI from the received signal after inputting the timing synchronization of the received signal, and inputs the guard interval GI to the FFT (Fast Fourier Transform) unit 24.
- the FFT unit 24 performs FFT calculation processing at the FFT window timing and converts the time domain signal into MXN subcarrier signals (subcarrier samples).
- the channel estimation unit 25 performs channel estimation for each subcarrier using the time-multiplexed pilot on the transmission side, obtains a channel compensation value for each subcarrier and inputs it to the channel compensation unit 26.
- the despreading unit 27 includes a number of multiplication units 27-27, and the multiplication unit 27 is assigned to the user.
- the carrier component is multiplied and output, and the other multiplication units perform the same arithmetic processing.
- the fading-compensated signal is despread by the channelization code (spreading code) assigned to each user, and the signal of the desired user is extracted from the code-multiplexed signal by this despreading.
- the synthesis unit 28-28 outputs the multiplication unit 27-27 power, respectively.
- the parallel data composed of ⁇ ⁇ ⁇ ⁇ symbols is generated by calculation, the parallel-serial conversion unit 29 converts the parallel data into serial data, and the data demodulation unit 30 demodulates the transmission data.
- the subcarrier components assigned the same numbers in FIG. 14 are spread and transmitted as subcarriers for one symbol.
- each symbol is spread by being multiplied by a channelization code (spreading code) having a code length of 4 at the time of transmission.
- despreading processing is performed at each timing, and one symbol is demodulated from four chips with the same numbers as in FIG. It is.
- multiple data communication can be performed by multiplying each user data by different channelization codes and spreading at the same time t.
- the channelization codes of each user and control data are orthogonal to each other, so that they do not interfere with each other.
- OFDM-CDMA Unlike systems that spread in the time direction, such as W-CDMA, OFDM-CDMA causes frequency selective fading due to multipath. Even if the amplitude of each chip is aligned in the time direction, the fluctuation may increase in the frequency direction. If the amplitudes of the chips are not equal, the orthogonality of the spread code is lost, and the components of other codes are mixed to deteriorate the reception characteristics.
- An example will be described below using downlink communication, but the same method can be applied to uplink communication.
- frequency selective fading occurs.
- the base station power is allocated to each subcarrier (frequency) even when the base station power is allocated to each subcarrier (frequency), when the terminal (mobile station) receives it, the power of each subcarrier is affected by the influence of the propagation path (channel). Is different. This is due to reflections from buildings, etc., due to multipath where radio waves transmitted from the base station arrive at the mobile station at multiple timings.
- the OFDM-CDMA communication system is characterized by multiplexing data at the same time and frequency by multiplying orthogonal channelization codes. This orthogonality is received
- the object of the present invention is to transmit N subcarrier components obtained by multiplying symbol data by a spreading code with a spreading factor of N using a subcarrier having the same propagation environment (reception power and reception amplitude).
- reception power and reception amplitude the reception amplitude fluctuation of the N subcarrier components on the receiving side is reduced.
- Another object of the present invention is to transmit N subcarrier components obtained by multiplying symbol data by a spreading code having a spreading factor of N, and the N subcarrier components on the receiving side and spreading of other users. This is to ensure that the orthogonality with the code is not lost and to prevent other users' signals from causing interference.
- Another object of the present invention is to reduce the degree of error reception on the receiving side. Another object of the present invention is to assign N subcarrier components multiplied by a spreading code to each subcarrier in order of frequency and transmit the subcarrier from the transmitting device to the receiving device when the communication environment is good. The correspondence information between the component and subcarrier should not be transmitted.
- Another object of the present invention is that when the spreading factor is small, N subcarrier components multiplied by a spreading code are assigned to each subcarrier in frequency order and transmitted, so that the subcarrier component is transmitted from the transmitting device to the receiving device. And subcarrier correspondence information is not transmitted.
- Another object of the present invention is to assign N subcarrier components multiplied by spreading codes to each subcarrier in frequency order when frequency fading is large, and to transmit each subcarrier component in order of frequency.
- the N subcarrier components obtained by multiplying the symbol data by the spreading code are transmitted using subcarriers with close propagation environments (received power and received amplitude), so that the time when the propagation environment is measured and the actual result are measured. Even if a deviation occurs between the times when the data reflecting the above is received, the time deviation is controlled so as not to have an adverse effect.
- Patent Document 1 JP 2001-86093 A
- the present invention creates a number of subcarrier components by multiplying each symbol of a plurality of symbols by a spreading code (channelization code) of length N corresponding to the spreading factor, and corresponding each of the subcarrier components.
- the present invention relates to a transmission method and a transmission apparatus in an OFDM-CDMA communication system that transmits by subcarrier.
- the propagation environment of each subcarrier is acquired, and the subcarriers are grouped for each of N subcarriers in the order of propagation environment.
- N subcarrier components multiplied by the channelization code for each symbol are transmitted on the same group of subcarriers. Also, the transmitting apparatus transmits the correspondence relationship between the subcarrier component and the subcarrier transmitting the subcarrier component to the receiving side so that it can be correctly demodulated.
- N subcarrier components obtained by multiplying the symbol data by a spreading code with a spreading factor of N are transmitted on subcarriers whose propagation environment (reception power and reception amplitude) are close to each other.
- the reception amplitude fluctuations of the N subcarrier components in can be reduced, and the orthogonality between the N subcarrier components on the receiving side and the spreading codes of other users can be prevented from being lost.
- the signals of other users can be prevented from becoming interference, and the degree of error reception can be reduced on the receiving side.
- the receiving device measures the amplitude or power of each subcarrier, notifies the transmitting device of the amplitude or power of each subcarrier as a propagation environment, and the transmitting device groups each subcarrier based on the amplitude or power. Divide. In this way, in the case of the FDD method, It is possible to measure the propagation environment with high accuracy, and to prevent the loss of orthogonality and reduce the degree of error reception.
- each subcarrier is measured by the transmitter, and each subcarrier is grouped based on the amplitude or power.
- the propagation environment is the same on the receiving side and the transmitting side, so the propagation environment is measured by the transmitting device. In this way, there is no need to notify the transmitting device of the propagation environment from the receiving device, which is advantageous in that the amount of communication can be reduced.
- N subcarrier components obtained by multiplying each symbol by a spreading code are assigned to subcarriers in order of frequency. If the communication environment is not good, the N subcarrier components are assigned based on the grouping. Assign carrier components to subcarriers in the same group. In this way, when the communication environment is good, there is no need to transmit the correspondence information between the subcarrier component and the subcarrier that transmits the subcarrier component from the transmission device to the reception device, which is advantageous in that the amount of communication can be reduced. It is.
- N subcarrier components multiplied by the spreading code based on the divide are allocated to subcarriers in the same group, and the fading frequency is large.
- N subcarrier components multiplied by the spreading code are assigned to each subcarrier in order of frequency.
- FIG. 1 is an explanatory diagram of a subcarrier propagation environment.
- FIG. 2 is a configuration diagram of a transmitting apparatus in the OFDM-CDMA communication system of the first embodiment.
- FIG. 3 is a configuration example of a receiving apparatus of an OFDM-CDMA communication system.
- FIG. 4 is a configuration diagram of a transmission apparatus in an OFDM-CDMA communication system according to a second embodiment.
- FIG. 5 is an explanatory diagram of the relationship between delay dispersion (delay spread) and frequency selective fusing.
- FIG. 6 is a block diagram of a transmitting apparatus in an OFDM-CDMA communication system of a third embodiment.
- Fig. 7 is a main part configuration diagram of a receiving apparatus including a delay spread estimation unit.
- FIG. 8 is an explanatory diagram of a delay profile and a delay spread.
- FIG. 9 is a block diagram of a transmitting apparatus in an OFDM-CDMA communication system according to a fourth embodiment.
- FIG. 10 is a block diagram of a transmitter in the OFDM-CDMA communication system of the fifth embodiment.
- FIG. 11 is a configuration diagram of a forging frequency estimation unit.
- FIG. 12 is a configuration example of a transmission side (base station) of a conventional OFDM-CDMA communication system.
- FIG. 13 is a configuration example of a receiving apparatus (mobile station) of a conventional OFDM-CDMA communication system.
- FIG. 14 is an explanatory diagram of spreading in the frequency direction for each symbol in the OFDM-CDMA communication system.
- FIG. 15 is an explanatory diagram of a subcarrier propagation environment.
- the transmitter multiplies each symbol by a spreading code (channelization code) of length N (N chips) corresponding to the spreading factor to create a plurality of subcarrier components.
- Each subcarrier component is transmitted on the corresponding subcarrier.
- the transmitter divides subcarriers into groups of N subcarriers in descending order of received power, and N subcarriers obtained by multiplying channelization codes. The component is transmitted on the same group of subcarriers.
- FIG. 2 is a configuration diagram of a transmitting apparatus (base station) in the OFDM-CDMA communication system of the first embodiment.
- This transmitting apparatus multiplies each symbol of M symbols by a spreading code corresponding to a spreading factor to create a plurality of subcarrier components, and each of the plurality of subcarrier components is a corresponding subcarrier.
- Send is a configuration diagram of a transmitting apparatus (base station) in the OFDM-CDMA communication system of the first embodiment.
- This transmitting apparatus multiplies each symbol of M symbols by a spreading code corresponding to a spreading factor to create a plurality of subcarrier components, and each of the plurality of subcarrier components is a corresponding subcarrier.
- a spreading code corresponding to a spreading factor
- Uplink signal receiver 31 receives the signal transmitted from the mobile station, and subcarrier propagation environment acquisition unit 32 demodulates the signal from the mobile station to receive reception environment information for each subcarrier, for example, received power value for each subcarrier. (Square of received amplitude) and received quality are acquired and input to the subcarrier group determining unit 33.
- the subcarrier group determination unit 33 divides all subcarriers into first to first M groups by N subcarriers in descending order of received power, and subcarrier components S—S Assigned to the second dal
- N subcarriers of a group are assigned to subcarrier component S S, and the Mth group
- N subcarriers are assigned to subcarrier components S — S.
- the received power values close to each other are grouped into the same subcarrier group.
- the correspondence relationship between the subcarrier component and the subcarrier is input to the rearrangement unit 46 and the control signal generation unit 34.
- the control signal creation unit 34 creates a control signal for notifying the mobile station of the correspondence information, spreads the control signal with a control spreading code, and inputs the control signal to the code multiplexing unit 45.
- the data modulation unit 41 modulates user transmission data and converts it into a complex baseband signal (symbol) having an in-phase component and a quadrature component.
- Time multiplexing part 42 is a pie of multiple symbols Time multiplexed before the transmitted data.
- the serial / parallel conversion unit 43 converts the input data into parallel data of M symbols, and each symbol is N-branched and input to the spreading unit 44.
- the spreading unit 44 has M multiplication units 44.
- Each chip C, C,... C of the channelization cord is individually connected to N branch thins.
- the subcarrier signal S—S for multicarrier transmission using M ⁇ N subcarriers is output from the spreading section 14. That is, the diffusion part 44
- the code multiplexing unit 45 code-multiplexes the subcarrier signal generated as described above with the subcarrier signal of another user or the control subcarrier signal generated by the same method. That is, the code multiplexing unit 45 synthesizes and outputs a subcarrier signal for a plurality of users and a control subcarrier signal corresponding to each subcarrier for each M X N subcarriers.
- the rearrangement unit 46 uses the correspondence relationship between the subcarrier component S 1 S and the subcarrier f 1 f input from the subcarrier group determination unit 33 to correspond to the subcarrier component S—S.
- the subcarrier component S-S corresponds to the first group of subcarriers F, F, F,.
- the IFFT unit 47 performs IFFT (inverse Fourier transform) processing on the subcarrier signals input in parallel and converts them into M ⁇ N subcarrier signal components (OFDM signals) on the time axis.
- the guard interval insertion unit 48 inserts a guard interval of a predetermined length into the OFDM signal, the orthogonal modulation unit 49 performs orthogonal modulation on the OFDM signal with the guard interval inserted, and the radio transmission unit 50 up-converts to a radio frequency. At the same time, it is amplified by high frequency and transmitted from the antenna.
- the transmission unit is formed by the configuration from the rearrangement unit 46 to the transmission radio unit 50.
- FIG. 3 shows an example of the configuration of a receiver (mobile station) in an OFDM-CDMA communication system.
- the radio receiver 61 performs frequency conversion processing on the received multicarrier signal, and the quadrature demodulator 62 receives it. A quadrature demodulation process is performed on the received signal.
- the timing synchronization / guard interval removal unit 63 obtains timing synchronization of the received signal, and then removes the guard interval GI from the received signal and inputs it to the FFT unit 64.
- the FFT unit 64 performs FFT calculation processing at the FFT window timing to convert the time domain signal into MXN subcarrier signals (subcarrier samples) S '— S
- the channel estimation unit 65 performs channel estimation for each subcarrier using the time-multiplexed pilot on the transmission side, obtains a channel compensation value for each subcarrier and inputs it to the channel compensation unit 66.
- the channel compensation unit 66 Fading compensation (channel compensation) is performed by multiplying the subcarrier signal by the channel compensation value.
- the power measuring unit 67 calculates received power for each subcarrier using the time-multiplexed pilot. The received power value of each subcarrier is transmitted as propagation environment information to the transmitter in FIG. 2 by a transmitter (not shown).
- the control information demodulator 68 demodulates the control information transmitted from the transmission device in the same manner as data demodulation described later, and subcarrier component S—S and subcarrier f
- the person in charge is acquired and input to the sorting unit 69.
- the sorting unit 69 sorts using this correspondence.
- the subcarrier component S—S is the first group of subcarriers F 1, F 2,
- the despreading unit 70 includes M multiplication units 70-70, and the multiplication unit 70 is assigned to the user.
- the subcarrier component S—S is multiplied and output, and the other multipliers perform the same arithmetic processing.
- the fading-compensated signal is despread by the channelization code assigned to each user, and the signal of the desired user is extracted from the code-multiplexed signal by this despreading.
- the combining unit 71-71 outputs the N multiplication results that also output the multiplication unit 70-70 force respectively.
- the parallel data composed of M symbols is generated, the parallel-serial conversion unit 72 converts the parallel data into serial data, and the data demodulation unit 73 demodulates the transmission data.
- N subcarrier components obtained by multiplying a channelization code with a spreading factor N by symbol data are subcarriers whose propagation environment (reception power, reception amplitude) is close.
- the signal amplitude fluctuation can be reduced.
- the orthogonality between the N subcarrier components on the receiving side and the channelization codes of other users can be prevented from being lost, and the signals of other users can be prevented from becoming interference. Therefore, according to the first embodiment, the degree of error reception on the receiving side can be reduced.
- the propagation environment (reception power) of the subcarrier is measured by the reception device (mobile station), and this is notified to the transmission device (base station) with an uplink signal.
- the FDD (Frequency Divisional Duplex) method is effective because the frequency differs between upstream and downstream.
- the uplink and downlink frequencies are the same, so the propagation environment of downlink signals can be measured on the base station side. According to this method, there is an advantage that it is not necessary to exchange propagation environment information between the mobile station and the base station.
- FIG. 4 is a block diagram of a transmitting apparatus in the OFDM-CDMA communication system of the second embodiment.
- the same reference numerals are given to the same parts as those of the first embodiment of FIG.
- the difference is that a power measurement unit 51 is provided as a subcarrier propagation environment acquisition unit, and the transmission environment (reception power) of each subcarrier is measured and acquired by the transmission apparatus.
- the power measuring unit 51 calculates the received power for each subcarrier using the pilot time-multiplexed with the uplink signal and inputs it to the subcarrier group determining unit 33. Thereafter, the same control as in the first embodiment is performed.
- the conventional method of assigning MXN subcarrier components, which are M symbols multiplied by the channelization code, to MXN subcarriers in frequency order is the correspondence between subcarrier component S—S and subcarrier f 1 f. Must be exchanged between the base station and mobile station
- MXN subcarrier components are assigned to each subcarrier in order of frequency, and when the communication environment is not good, MXN pieces are assigned based on the grouping in the first embodiment. Assign subcarrier components to subcarriers.
- Wave number selective fading is moderate.
- Fig. 5 (B) if the communication environment is not good and the multipath delay spread ⁇ is large, the variation in frequency selective fusing will increase.
- ⁇ ⁇ ⁇ subcarrier components are arranged in order of frequency. If it is assigned to a carrier and the communication environment is not good, that is, if the variation in frequency-selective fading is large and the code orthogonality collapses greatly, the number of MX is reduced based on the grouping in the first embodiment. Assign subcarrier components to subcarriers.
- FIG. 6 is a block diagram of a transmitting apparatus in the OFDM-CDMA communication system of the third embodiment.
- the same reference numerals are given to the same parts as those of the first embodiment of FIG. The difference is that a communication environment acquisition unit 52 and a group determination control unit 53 are provided.
- the communication environment acquisition unit 52 demodulates the signal from the mobile station to acquire communication environment information, for example, delay spread, and inputs it to the group decision control unit 53.
- the loop decision control unit 53 determines the quality of the communication environment based on the size of the delay spread. If the delay spread is shorter than the set value and the communication environment is good, the subcarrier component S
- Subcarrier group decision unit N 1 N to assign S to subcarrier f 1 f in order of frequency
- the subcarrier group determining unit 33 is instructed to assign the subcarrier component to the subcarrier based on the loop division as in the first embodiment.
- the subcarrier group determining unit 33 If the subcarrier group determining unit 33 is instructed to assign the subcarrier components to the subcarriers in order of frequency, the subcarrier group determining unit 33 inputs the fact to the rearranging unit 46 and the control signal creating unit 34. Components S—S in frequency order and subcarrier f order
- control signal creation unit 34 creates a control signal for notifying the mobile station that the correspondence relationship between the subcarrier components and the subcarriers is in order of frequency, and spreads the control signal using a control spreading code. To the code multiplexer 45.
- the subcarrier group determination unit 33 is based on the grouping of the first embodiment. If it is instructed to assign subcarrier components to subcarriers, each subcarrier is grouped into first, first, and first M groups by N subcarriers in descending order of received power as in the first embodiment. Assign subcarrier components S—S in order of M
- the control signal creation unit 34 creates a control signal for notifying the correspondence information to the mobile station, and spreads the control signal with a control spreading code and inputs it to the code multiplexing unit 45.
- the rearrangement unit 46 receives the subcarrier component S—S input from the subcarrier group determination unit 33 and the subcarrier f.
- the key component S—S is input in parallel to the IFFT unit 47 terminal corresponding to the corresponding subcarrier.
- FIG. 7 is a block diagram of the main part of a receiving apparatus provided with a delay spread estimation unit 81. The same parts as those in FIG.
- the FFT unit 64 performs an FFT calculation process on the OFDM symbol data, and M ⁇ N signals S ′ — S
- channel estimation is performed for each subcarrier using pilots multiplexed on the transmission side.
- the subcarrier signal is multiplied by a channel compensation value to compensate for fading.
- the IFFT calculation unit 81a of the delay spread 81 performs IFFT calculation on the M X N channel estimation values C to C output from the channel estimation unit 65, and M X N per OFDM symbol period shown in FIG.
- Output a delay profile consisting of samples. Each sample value indicates the strength of the received wave (direct wave, delayed wave) in the multipath.
- each sample value in the delay profile is small below the set level. Value.
- the delay spread detector 81b detects this delay time M as a delay spread and outputs it.
- the delay spread indicates the spread of multinoses, and can be used to judge the reception status of mobile stations. If the delay spread is large, the maximum delay time is large and the reception state is bad. If the delay spread is small, the maximum delay time is small and the reception state is good.
- the delay spread is measured by the receiving device (mobile station) and transmitted to the transmitting device (base station).
- the delay spread of each mobile station is measured on the base station side.
- the amount increases with increasing diffusivity. For example, in the case of the propagation environment shown in FIG. 1, if the spreading factor is 2, only adjacent subcarriers are used, so the difference in amplitude is not so large. On the other hand, when the spreading factor is 8, a maximum of 7 sub-carriers are used, so the amplitude difference becomes large, the orthogonality is greatly lost, and the characteristic deterioration is increased.
- FIG. 9 is a block diagram of a transmitting apparatus in the OFDM-CDMA communication system of the fourth embodiment. The same parts as those of the first embodiment of FIG. The difference is that a group decision control unit 85 for specifying a subcarrier group decision method based on the spreading factor is provided.
- the group decision control unit 85 compares the spreading factor N with the set value, and if the spreading factor N is smaller than the set value, assigns the subcarrier component S—S to the subcarrier f 1 f in order of frequency.
- the subcarrier group determination unit 33 is instructed. On the other hand, if the spreading factor N is larger than the set value, the subcarrier group determination unit 33 is instructed to allocate the subcarrier component to the subcarrier based on the loop division as in the first embodiment.
- the subcarrier group determining unit 33 When the subcarrier group determining unit 33 is instructed to assign the subcarrier components to the subcarriers in order of frequency, the subcarrier group determining unit 33 inputs the fact to the rearranging unit 46 and the control signal creating unit 34. S—S in order of frequency, subcarrier f order f Assign to the number.
- the control signal creation unit 34 creates a control signal for notifying the mobile station that the correspondence relationship between the subcarrier component and the subcarrier is in order of frequency, and spreads the control signal with a control spreading code to perform code multiplexing. Enter in part 45.
- the subcarrier group determination unit 33 is instructed to assign subcarrier components to subcarriers based on the grouping in the first embodiment, the subcarriers are determined in descending order of received power as in the first embodiment.
- Each group is divided into first to first M groups, and N subcarrier components S—S are assigned to each group in order.
- the correspondence between the subcarrier component and the subcarrier is input to the rearrangement unit 46 and the control signal generation unit 34.
- the control signal creation unit 34 creates a control signal for notifying the mobile station of this correspondence information, spreads the control signal with a control spreading code, and inputs it to the code multiplexing unit 45.
- the rearrangement unit 46 uses the correspondence relationship between the subcarrier component S—S input from the subcarrier group determination unit 33 and the subcarrier f ⁇ 1 f to obtain a subcarrier component S—S.
- the mobile station needs to measure the propagation environment and feed it back to the base station as in the first embodiment. For this reason, a gap occurs between the time when the propagation environment is measured and the time when the data that reflects the result is actually received.
- the moving speed of the mobile station is fast, the fading fluctuation in the time direction is large, so there is a fear that the propagation environment will change during this time shift.
- MXN subcarrier components each multiplied by the channelization code are multiplied by N based on the grouping in the first embodiment.
- the MXN subcarrier components multiplied by the channelization code are assigned to each subcarrier in order of frequency.
- FIG. 10 is a block diagram of a transmitting apparatus in the OFDM-CDMA communication system of the fifth embodiment, and the same reference numerals are given to the same parts as those of the first embodiment of FIG. The difference is that a fading frequency detection unit 91 and a group determination control unit 92 are provided.
- the fading frequency detector 91 demodulates the signal from the mobile station to detect the fading frequency, and Input to the decision control unit 92. If the fading frequency is greater than the set value, the group decision control unit 92 assigns the subcarrier component S—S to the subcarrier f 1 f in order of frequency.
- the subcarrier group determination unit 33 is instructed to On the other hand, if the fading frequency is smaller than the set value, the subcarrier group determining unit 33 is instructed to assign the subcarrier component to the subcarrier based on the loop division as in the first embodiment.
- the subcarrier group determination unit 33 assigns subcarrier components to each subcarrier in order of frequency.
- the rearrangement unit 46 When instructed to assign, the fact is input to the rearrangement unit 46 and the control signal creation unit 34, and the rearrangement unit 46 sorts the subcarrier components S—S in order of frequency into subcarriers f.
- control signal creation unit 34 creates a control signal for notifying the mobile station that the correspondence relationship between the subcarrier component and the subcarrier is in order of frequency, and spreads the control signal with a control spreading code. To the code multiplexer 45.
- each subcarrier is assigned in descending order of received power as in the first embodiment.
- N subcarriers are grouped into first, first, and first M groups, and N subcarrier components S—S are assigned to each group in order.
- the control signal creation unit 34 creates a control signal for notifying the mobile station of the correspondence information, spreads the control signal with a control spreading code, and inputs the control signal to the code multiplexing unit 45.
- the rearrangement unit 46 uses the correspondence relationship between the subcarrier component S—S and the subcarrier f ⁇ 1 f input from the subcarrier group determination unit 33 to generate a subcarrier.
- the key component S—S is input in parallel to the IFFT unit 47 terminal corresponding to the corresponding subcarrier.
- FIG. 11 is a configuration diagram of a fading frequency estimation unit in the receiving apparatus.
- the receiving unit 101 selects and outputs a pilot signal from the antenna reception signal
- the sampling unit 102 samples the pilot signal at a set period
- the difference calculation unit 103 calculates the level difference between adjacent sampling signals
- the integration unit 104 integrates the difference for a predetermined time
- the fusing frequency estimation unit 105 estimates a fading frequency based on the integration value.
- the fading frequency estimation apparatus in FIG. 11 calculates the slope of the peak portion of the received power waveform by the sampling unit 102, the difference calculation unit 103, and the integration unit 104, and estimates the fading frequency based on the slope. .
- N subcarrier components obtained by multiplying a symbol data by a spreading code having a spreading factor N are transmitted by subcarriers having a close propagation environment (reception power, reception amplitude).
- reception power, reception amplitude the reception amplitude fluctuation of the N subcarrier components on the receiving side can be reduced.
- the orthogonality between the N subcarrier components on the receiving side and the spreading codes of other users can be prevented from being lost, the signals of other users can be prevented from becoming interference, and the receiving accuracy on the receiving side can be improved.
- MXN subcarrier components obtained by multiplying M symbol data by a spreading code of spreading factor N are allocated to each subcarrier in order of frequency.
- the spreading factor is small, MXN subcarrier components obtained by multiplying the M symbol data by the spreading code of spreading factor N are assigned to each subcarrier in order of frequency and transmitted.
- the receiving apparatus there is no need to notify the receiving apparatus of the correspondence relationship between the subcarrier components and the subcarriers from the transmitting apparatus, which is advantageous in that the amount of communication can be reduced.
- N subcarrier components multiplied by spreading codes are assigned to each subcarrier in order of frequency and transmitted.
- spreading factor N Since the N subcarrier components obtained by multiplying the symbol data by the spreading code are transmitted in a subcarrier with a close propagation environment (received power, received amplitude), the time and actual time when the propagation environment is measured Even if a deviation occurs between the times when the data reflecting the result is received, the time deviation can be controlled so as not to have an adverse effect.
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Abstract
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Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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PCT/JP2005/000518 WO2006077620A1 (ja) | 2005-01-18 | 2005-01-18 | Ofdm-cdma通信システムにおける送信方法および送信装置 |
CN2005800465629A CN101099322B (zh) | 2005-01-18 | 2005-01-18 | Ofdm-cdma通信系统的发送方法及发送装置 |
EP20050703755 EP1841112B1 (en) | 2005-01-18 | 2005-01-18 | Transmitting method and transmitting apparatus in ofdm-cdma communication system |
JP2006553774A JP4614977B2 (ja) | 2005-01-18 | 2005-01-18 | Ofdm−cdma通信システムにおける送信方法および送信装置 |
US11/822,354 US8189695B2 (en) | 2005-01-18 | 2007-07-05 | Transmission method and transmission apparatus in an OFDM-CDMA communication system |
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PCT/JP2005/000518 WO2006077620A1 (ja) | 2005-01-18 | 2005-01-18 | Ofdm-cdma通信システムにおける送信方法および送信装置 |
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US11/822,354 Continuation US8189695B2 (en) | 2005-01-18 | 2007-07-05 | Transmission method and transmission apparatus in an OFDM-CDMA communication system |
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EP (1) | EP1841112B1 (ja) |
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WO (1) | WO2006077620A1 (ja) |
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Also Published As
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JPWO2006077620A1 (ja) | 2008-06-12 |
EP1841112A1 (en) | 2007-10-03 |
EP1841112B1 (en) | 2014-06-04 |
EP1841112A4 (en) | 2012-07-04 |
US20070258509A1 (en) | 2007-11-08 |
CN101099322B (zh) | 2012-08-22 |
JP4614977B2 (ja) | 2011-01-19 |
CN101099322A (zh) | 2008-01-02 |
US8189695B2 (en) | 2012-05-29 |
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