WO2006054697A1 - 通信装置、通信システム及び通信方法 - Google Patents
通信装置、通信システム及び通信方法 Download PDFInfo
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- WO2006054697A1 WO2006054697A1 PCT/JP2005/021246 JP2005021246W WO2006054697A1 WO 2006054697 A1 WO2006054697 A1 WO 2006054697A1 JP 2005021246 W JP2005021246 W JP 2005021246W WO 2006054697 A1 WO2006054697 A1 WO 2006054697A1
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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
- H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
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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
- H04L1/0002—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
- H04L1/0005—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes applied to payload information
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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
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
- H04L1/0011—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding applied to payload information
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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
- H04L1/0036—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the receiver
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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
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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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
- 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
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0037—Inter-user or inter-terminal allocation
- H04L5/0039—Frequency-contiguous, i.e. with no allocation of frequencies for one user or terminal between the frequencies allocated to another
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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
- H04L5/0064—Rate requirement of the data, e.g. scalable bandwidth, data priority
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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
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0096—Indication of changes in allocation
Definitions
- the present invention relates to a communication apparatus, a communication system, and a communication method, and more particularly, adaptive transmission technology in a subcarrier communication system, that is, communication that performs adaptive modulation and coding in a radio communication orthogonal frequency division multiplexing (OFDM) system.
- the present invention relates to an apparatus, a communication system, and a communication method. Background art
- OFDM technology is now a mainstream technology to solve high-speed wireless data transmission!
- the principle of OFDM technology is that high-speed data to be transmitted is transmitted using a number of orthogonal subcarriers, and the data rate on each subcarrier is relatively low.
- the orthogonality of subcarriers in OFDM improves the spectrum utilization of the system. Since OFDM divides the entire signal bandwidth into multiple narrow subcarrier frequency bands, flat fading occurs when the bandwidth of each subcarrier is smaller than the channel bandwidth. Thus, compared to a monocarrier system, flat fading in OFDM can be realized more easily.
- OFDM technology has been successfully applied to Asymmetric Digital Subscriber Line (ADSL), Digital Television Broadcasting (DVB), and Wireless ATM (WATM) systems.
- ADSL Digital Subscriber Line
- DVD Digital Television Broadcasting
- WATM Wireless ATM
- AMC adaptive modulation 'code key
- BER error rate
- Throughput is the spectrum utilization factor of the system, that is, the amount of information transmitted within a unit spectral bandwidth and unit time.
- the basic idea of AMC technology is to adaptively change one or several of transmission power, symbol transmission rate, coordinate size, code rate and coding mechanism based on the current channel characteristics. When channel conditions are good, a lot of information In the case of poor channel conditions, a small amount of information is transmitted to guarantee a constant reception BER request.
- FIG. 1 is a diagram showing an example of OFDM channel characteristics.
- the two horizontal axes indicate OFDM symbol numbers on the time domain and subcarrier numbers on the frequency domain, respectively, and the vertical axes indicate channel gains corresponding to the OFDM symbols and subcarriers. Due to the time-domain spreading and time-domain spreading of the channel being transmitted, the OFDM channel varies even in the time domain and in the frequency domain.
- AMC AMC based on subcarriers
- AMC AMC based on subbands.
- AMC means that each subcarrier is a minimum unit of adaptation, and transmission is performed using a different modulation scheme and code key scheme for each subcarrier of OFDM.
- AMC based on subcarriers has the problem that the overhead of feedback is too large in addition to the difficulty of realization. In general, it is difficult to implement an AMC method based on subcarriers in an actual system.
- the other most commonly used configuration in OFDM is the subband AMC configuration using independent codes ⁇ , that is, the conventional subband adaptation method.
- FIG. 2 shows conventional subband adaptive modulation and coding.
- a subband here refers to a subcarrier group formed by subcarriers located adjacent to each other in the frequency domain.
- N the total number of subbands.
- one modulation code key block is formed by the same subband in OFDM symbols of several adjacent forces (M in the case of FIG. 2).
- each modulation and coding block has its own channel characteristics. Based on the characteristics, the estimation of the code key modulation parameter and the independent code key are performed.
- the number in each code key modulation block in Fig. 2 represents the class to which the code key modulation parameter of the code key modulation block belongs.
- the code modulation parameter corresponding to each code modulation parameter class is determined at an early stage of the system.
- Table 1 shows the relationship among the class, coding parameters, and modulation parameters as an example.
- the present invention is not limited to Table 1.
- FIG. 3 shows a block diagram for realizing a conventional subband adaptation method for OFDM.
- FIG. 3A and FIG. 3B are block diagrams showing a conventional OFDM-AMC system in which OFDM and AMC are combined.
- Fig. 3A is a base station (AP)
- 3B is a mobile terminal (UE).
- the transmission from Figure 3A to Figure 3B uses the AMC mechanism.
- the information bits to be transmitted first pass through the adaptive modulation and encoding unit 301, and the serial modulation symbols that are output are further converted into serial Z parallel converter (SZP) unit 302, inverse fast Fourier transform, respectively.
- SZP serial Z parallel converter
- IFFT inverse fast Fourier transform
- PZS parallel Z-serial conversion
- a guard interval insertion unit 305 inserts a guard interval. Then, it is transmitted via the antenna 3 06.
- PZS parallel Z-serial conversion
- the guard interval inserted first on the transmitting side is removed by the guard interval removing unit 315, and further, Pass through serial Z parallel converter (SZP) unit 314 and fast Fourier transform (FFT) unit 313, respectively, in the time domain.
- SZP serial Z parallel converter
- FFT fast Fourier transform
- the symbol power is converted into the frequency domain, and subjected to parallel Z-serial conversion processing by a parallel Z-serial converter (PZS) unit 312, and finally output by an adaptive demodulation / decoding unit 311 to obtain received data.
- PZS parallel Z-serial converter
- the adaptive transmission from the transmission side in FIG. 3A to the reception side in FIG. 3B is mainly realized by an adaptive modulation / encoding section 301 on the transmission side and an adaptive demodulation / decoding section 311 on the reception side.
- the meaning of adaptive modulation and coding is that the parameters corresponding to the transmitting side are adjusted on the receiving side by adaptively adjusting the modulation and coding parameters on the transmitting side based on the current channel characteristics. If demodulation and decoding are performed using In a general system, the adaptive parameters required by the adaptive demodulation / decoding unit 311 are based on feedback on the receiving side.
- the receiving side Before transmitting each data block, the receiving side always first estimates the channel of transmission to the receiving side by the channel estimation unit 319 and acquires the channel characteristics of each subcarrier of OFDM. Based on these channel characteristics, the receiving side determines the modulation and code parameters used for each subband of OFDM when the transmitting side transmits data at this time by the parameter selection unit 318. There are two uses for the adaptive modulation and code parameters in each subband obtained by the parameter selection unit 318.
- the first application is used as a modulation and code parameter in each subband of OFDM when the transmitting side transmits data at the present time.
- the subband AMC parameter selector 318 on the receiving side selects the modulation and code parameters of each OFDM subband, and then receives the parameter transmitter 320 on the receiving side, the antenna 316 on the receiving side, and the antenna on the transmitting side. These parameters are sent back to the transmission side through a feedback path 306 and parameter reception / extraction unit 307 on the transmission side. After the transmission side extracts these parameters, the AMC control unit 308 controls the adaptive modulation / encoding unit 301.
- the second application is used as a parameter when the receiving side performs demodulation and decoding.
- the receiving side can always obtain accurate information bits only by demodulating and decoding the received data based on the modulation and coding parameters that match the transmitting side. Therefore, after the subband AMC parameter selection unit 318 obtains the AMC parameter, it further sends it to the adaptive demodulation 'decoding unit 317, and the subband AMC parameter selection unit 318 sends it to the adaptive demodulation' decoding unit 317. It must be stored temporarily and used for control of the receiving side's adaptive demodulation 'decoding unit 311.
- FIG. 4A and FIG. 4B subdivide module 309 in FIG. 3A and module 321 in FIG. 3B.
- FIGS. 4A and 4B are diagrams showing a configuration for realizing a conventional subband adaptive modulation / coding scheme.
- adaptive modulation / encoding section 301 includes adaptive encoding section 401, interleaving section 402 and adaptive modulation section 403, and the data output from adaptive modulation / encoding section 301 is serial.
- the signal is sent to an inverse fast Fourier transform (IFFT) unit 303 via a Z parallel conversion (SZP) unit 302.
- IFFT inverse fast Fourier transform
- SZP Z parallel conversion
- the AMC control unit 308 on the transmission side performs an adaptive modulation / encoding unit 301 based on the modulation and code key parameters of each subband for which the parameter reception / extraction unit 307 in FIG. Control.
- independent code modulation is performed on each subband of OFDM. That is, every subband has its own modulation and coding parameters.
- the AMC control unit 308 controls the adaptive modulation / encoding unit 301 according to the acquired code parameter C and modulation parameter M of each subband. Further, the AMC control unit 308 further obtains the number of information bits to be transmitted for each subband based on the encoding parameter and the modulation parameter M, and thereby generates the corresponding interleave matrix IT.
- the interleaving unit 402 of the adaptive modulation / encoding unit 301 is controlled.
- On the sending side, 404 data is obtained after AMC. This in turn includes data to be transmitted in subbands 1, 2,... N, and the modulation and coding schemes are (C, M), (C, M), Hence, (C, M), respectively.
- AMC parameters necessary for the transmission side to transmit each data block are also fed back from the reception side. That is, before transmitting each data block on the transmitting side, the AMC parameter must be selected for the data block transmitted on the transmitting side by the receiving side first.
- the procedure for selecting parameters on the receiving side is to first perform channel estimation based on the received signal. Channel estimation is based on pilot Or blind channel estimation. Thereafter, channel estimation section 319 sends the acquired channel characteristics of each subcarrier of OFDM to subband AMC parameter selection section 318.
- the subband AMC parameter selection unit 318 first analyzes the performance of each subband in OFDM, and then, the AMC parameter suitable for each subband. Select.
- the AMC parameters obtained in this way are sent back to the transmitting side through the feedback channel, and are used for actual adaptive modulation and coding operations when the transmitting side performs transmission, while the receiving side's Used in the demodulation / decoding control unit 409.
- the parameter storage unit 410 for storing the parameters acquired at the present time is required.
- the adaptive demodulation / decoding unit 311 on the reception side includes an adaptive demodulation unit 408, a dingering unit 407, and an adaptive decoding unit 406.
- the adaptation method using the conventional subband independent codes as shown in FIGS. 3A to 4B can effectively reduce the degree of difficulty in realizing adaptation.
- the feedback overhead of the system can be effectively reduced.
- such a method still has a drawback that the diversity capability between subbands cannot be effectively used.
- Diversity is an important method for improving wireless transmission quality.
- the diversity mentioned here is: the sender uses a certain resource to increase the redundancy of information, transforms or attenuates redundant information as independently as possible, and the receiver receives the information. It is a technique to obtain a certain system gain by combining and using them comprehensively. Briefly, this is a technique in which transmission is performed simultaneously using a plurality of routes, and a loss of a route on the receiving side is compensated by another route.
- This application covers the basics of the conventional independent coding scheme using subbands in OFDM adaptive modulation and coding, and combines the subbands in a certain method to form subband groups. If a joint code is applied to, a patent for the method is sought.
- each subband independently selects parameters and performs sign coding, so the method of the present application seems to go against the conventional AMC concept.
- this method applies diversity between subbands, A larger coding gain can be obtained.
- the modulation code key parameter in the subband group is selected by the method proposed here, transmission throughput is not lost as compared with the conventional method.
- An object of the present invention is to combine all subbands on the frequency domain of a subcarrier communication system based on a certain rule to form several subband groups, and then to each subband group.
- the conventional subband adaptation method by selecting the modulation and code parameters used when performing joint code, the system spectrum utilization, especially fast fading and channel estimation Communication equipment, communication system, and communication method that can improve the spectrum utilization rate under error, reduce the difficulty of adaptation, and reduce the feedback overhead. Is to provide.
- the communication device of the present invention includes channel estimation means for performing channel estimation for each subband, and modulation parameters and code parameters based on the result of the channel estimation for each subband group including a plurality of subbands.
- Parameter determining means for determining the parameter information
- parameter information transmitting means for transmitting parameter information, which is information on the modulation parameter and the encoding parameter determined by the parameter determining means, to the communication partner, and parameter information transmission
- Receiving means for receiving a received signal including data modulated and encoded for each of the subband groups at the communication partner by the modulation parameter of the parameter information transmitted by the means and the encoding meter; and the receiving means
- the modulation signal determined by the parameter determination means and the received signal received at A data acquisition means is provided that demodulates and decodes each subband group with an encoding parameter to acquire the data included in the received signal.
- a communication system of the present invention is a communication system including a base station apparatus that transmits modulated and encoded data, and a communication terminal apparatus that receives the data.
- the communication terminal apparatus has channel estimation means for performing channel estimation for each subband, and parameter determination for determining a modulation parameter and a code key parameter for each subband group based on the result of the channel estimation.
- a reception means for receiving a reception signal including data modulated and encoded for each subband group by the base station apparatus using a parameter of the transmitted parameter information; and a reception signal received by the reception means For each subband group, the modulation parameter and the encoding parameter of the parameter information
- Data extraction means for adjusting and decoding and extracting the data contained in the received signal, wherein the base station apparatus transmits the modulation parameter and encoding of the parameter information transmitted by the transmission means. It adopts a configuration comprising adaptive modulation 'coding means for modulating and encoding according to parameters, and data transmission means for transmitting data modulated and encoded by the adaptive modulation' coding means.
- a channel estimation is performed for each subband, and a modulation parameter and a code parameter are determined for each subband group having a plurality of subband forces based on the result of the channel estimation.
- a communication terminal apparatus receiving a reception signal including the data transmitted by the base station apparatus; And demodulating and decoding the received signal for each subband group with the modulation parameter and the encoding parameter of the parameter information, and extracting the data included in the received signal.
- FIG. 3A Block diagram showing the configuration of the transmission side of a conventional OFDM- AMC system
- FIG. 3B Block diagram showing the configuration of the receiving side of a conventional OFDM- AMC system
- FIG. 4A A diagram showing a module including a conventional adaptive modulation and coding unit on the transmission side.
- FIG. 4B is a diagram showing a conventional adaptive demodulation on the receiving side 'module including a decoding unit.
- FIG. 5A is a block diagram showing the configuration of the transmission side of the OFDM-AMC system according to the embodiment of the present invention.
- FIG. 5B is a block diagram showing a configuration of the receiving side of the OFDM-AMC system according to the embodiment of the present invention.
- FIG. 6A is a diagram showing a module including a transmission-side adaptive modulation 'code key section according to an embodiment of the present invention.
- FIG. 6B is a diagram showing a module including a receiving-side adaptive demodulation 'decoding unit according to an embodiment of the present invention.
- FIG. 7 is a diagram showing an adaptive modulation and coding method according to the embodiment of the present invention.
- FIG. 8 shows an example of a subband group according to the embodiment of the present invention.
- FIG. 9 shows an example of a subband group according to the embodiment of the present invention.
- FIG. 10 is a diagram showing an example of a subband group according to the embodiment of the present invention.
- FIG. 11 is a diagram showing a comparison result of performance between adaptive modulation and coding according to an embodiment of the present invention and conventional adaptive modulation and coding.
- FIG. 12 is a diagram showing a comparison result of performance between adaptive modulation and coding according to the embodiment of the present invention and conventional adaptive modulation and coding.
- the present invention relates to independent subband code modulation in the conventional OFDM adaptive modulation code
- subbands are combined in a certain manner to form subband groups, and joint codes are performed on each subband group.
- the present invention proposes various methods for subbands as subband groups, and also proposes a method for selecting parameters of modulation and code key used when performing joint code key in the subband. These will be described later.
- FIG. 5A and FIG. 5B are diagrams showing an OFDM-AMC system configuration for realizing the method of the present invention.
- the system to which the OFDM-AMC of the present invention is applied has the following differences.
- the sub-band loop AMC parameter selection unit 504 which is a parameter determination unit, included in the module 505 shown in FIG. 5B selects the AMC parameter of the sub-band group, and the sub-band AMC included in the module 321 in FIG. 3B.
- Parameter selector 316 selects the AMC parameters for each subband. This is because, in the conventional OFDM-AMC system, the unit of subband adaptive modulation and coding is subband, whereas in the OF DM-AMC system of the present invention, adaptive modulation and coding is used. This is because the unit is a subband group.
- the OFDM-AMC system of the present invention includes a series of feedback loops in the order of the parameter transmission unit 320, the reception-side antenna 316, the transmission-side antenna 306, and the transmission-side parameter reception 'extraction unit 307 in FIG. 5B.
- the AMC parameters related to the subband group as parameter information which is information on the modulation parameters and the coding parameters, are transmitted in the subband as in the conventional OFDM-AMC system shown in FIG. This is not an AMC parameter.
- adaptive transmission control section 501 includes AMC control section 308 shown in FIG. Has been replaced.
- the transmitting side performs adaptive modulation and coding for subband duplication in OFDM! ⁇ ⁇
- Subband groups are formed by combining OFDM subbands based on the combination pattern. Therefore, the adaptive transmission control unit 501 must control the AMC of the subband group in the adaptive modulation / code unit 301, while transmitting in each subband group. Controls the serial Z-parallel converter (SZP) 302 after adaptive modulation and coding so that information bits are mapped and transmitted to the corresponding subband in OFDM after coding and modulation. Must be done.
- SZP serial Z-parallel converter
- adaptive reception control section 503 is replaced with adaptive demodulation / control section 317 shown in FIG. 3B.
- the adaptive reception control unit 503 must control the adaptive demodulation-decoding unit 311 that is a data acquisition means! /
- parallel Z-serial conversion (PZS) which is the previous stage of adaptive demodulation and decoding, must be performed. Control is also performed on the unit 312 to synthesize and demodulate and decode received symbols in the same subband group.
- Module 502 of FIG. 5A and module 505 of FIG. 5B are subdivided and shown in FIGS. 6A and 6B.
- FIG. 6A and FIG. 6B are diagrams showing a configuration for realizing the method proposed by the present invention.
- the unit of adaptive modulation and code key is not a subband but a subband group.
- the output 603 of the adaptive modulation / code unit 301 sequentially includes transmission data in subband groups 1, 2,... K, and the modulation scheme and coding scheme are (C 1, M 2), (C , M), «, (C, M), where K is a subband divided within OFDM
- the transmission side stores the combination pattern storage unit 601 and, based on the subband combination pattern, the serial Z parallel conversion (SZP) unit 302 Control must also be performed for serial Z-parallel conversion, whereby the information bits transmitted in each subband group are mapped and transmitted to the corresponding subbands in OFDM after the sign and modulation. To do.
- SZP serial Z parallel conversion
- the receiving side On the receiving side, the difference from the conventional subband adaptation shown in FIG. And the unit of sign y is a subband group which is not a subband.
- the receiving side also has a combination pattern storage unit.
- the parallel Z-serial conversion (PZS) unit 312 must also control the parallel Z-serial conversion, so that the same sub-band of OFDM can be controlled.
- the received symbols in the band group are combined and demodulated and decoded.
- the subband group AMC parameter selection unit 504 is also different from FIG. 4B.
- the parameter selection unit 411 selects and acquires the parameters of each of the OFDM subbands, and is further stored in the combination pattern storage unit 607 based on the combination pattern.
- the adaptive parameter of each subband group of OFDM must be selected.
- FIG. 7 is a flowchart showing processing for realizing the adaptive coding scheme and modulation scheme of the embodiment of the present invention. Specifically, the process of realizing the technology of the present invention is as follows.
- the receiving side determines adaptive modulation and coding parameters in each subband group in the transmitting side OFDM, and feeds back the determined parameters to the transmitting side.
- This process consists of channel estimation on the receiving side (step 901), adaptive parameter selection for each OFDM subband (step 902), adaptive parameter selection for each OFDM subband group (step 903), and parameter feedback (step 921). including.
- Channel estimation in step 901 can be performed by using an existing general method such as channel estimation or blind channel estimation based on a pilot.
- step 902 the adaptive parameter selection for each subband of OFDM is performed by using the modulation and code used when performing adaptive transmission for each subband of OFDM in the case of the conventional independent code for each subband.
- the parameters are shown. Since they are independent codes, the parameters in each subband differ depending on the channel characteristics.
- the existing methods for selecting parameters based on channel characteristics are the method based on the lowest signal-to-noise ratio of the subband, the method based on the average signal-to-noise ratio of the subband, the method based on the capacity, and the average signal-to-noise ratio.
- the method based on the average signal-to-noise ratio will be briefly described as an example.
- the threshold of the signal-to-noise ratio (see Table 2) required by various modulation and coding parameters is determined by a method such as theoretical analysis or simulation.
- the throughput capacity ie, the spectrum utilization corresponding to various modulation and coding parameters, is numerically equal to the product of the coding rate and the number of bits contained in each symbol.
- the average signal-to-noise ratio on the inner subcarrier is calculated.
- the modulation and coding parameters where the threshold is lower than the average signal-to-noise ratio for the subband and the throughput capability is the highest are selected as the modulation and coding parameters for the subband.
- Table 2 shows the relationship among coding parameters, modulation parameters, signal-to-noise ratio thresholds, and throughput capability in each class. For example, if the average signal-to-noise ratio in the subband is 0, 2, 4, 6, 8, and according to the parameters shown in Table 2, the class corresponding to the selected modulation and coding parameters is They are 1,1, 2,3,4 respectively. Correspondingly, the number of information bits allocated in the subband is determined (numerically the total number of subcarriers in the subband and the throughput capability corresponding to the selected coding and modulation parameters. Is equal to the product of
- Threshold Pitch Threshold (dB) Ability (bps / Hz
- the adaptive parameter selection for each subband group of OFDM in step 903 was performed by modulating and coding independently for each subband of OFDM in the conventional adaptation method.
- the unit of adaptive transmission is not a subband but a subband group. Therefore, all subbands in the OFDM frequency domain are first made into several subband groups based on a certain combination method (or combination pattern).
- a method of combination there are a method of combining adjacent subbands, a method of combining subbands with a gap, a method of combining all subbands, and a method of combining by other rules.
- the method of combining adjacent subbands is to combine several subbands at adjacent positions with one subband group as shown in FIG. It is a method to do.
- FIG. 8 shows an example of combining adjacent subbands.
- the subband group has a combination pattern of subbands, and the subband is formed by the same number of subcarriers located adjacent to each other in frequency within a specific number of subcarrier modulation symbols.
- N subbands on the frequency domain at the same position in the OFDM time domain are defined as several subband groups.
- subbands located adjacent to each other in frequency are defined as one subband group. That is, subbands in the same shaded pattern in the figure belong to the same subband group.
- FIG. 9 is a diagram showing an example of combining subbands with an open interval.
- subbands whose intervals are opened on the OFDM frequency domain are selected and combined into one subband group. That is, subbands in the same shaded pattern in the figure belong to the same subband group.
- the method of combining all subbands is to combine all subbands in the frequency domain into one subband group as shown in FIG. It is a method to synthesize.
- Figure 10 shows an example of combining all subbands.
- a method of combining according to other rules is assigned within a subband group after the subband group modulation and code key parameters and the number of information bits to be assigned are determined.
- the number of information bits and joint coding parameters are determined as follows. First, the sum of the number of information bits assigned to each subband is obtained to obtain the number of information bits assigned to the entire subband group. Next, the maximum modulation class within each subband is unified for the subband group. The modulation method used for modulation is determined, and then the number of information bits allocated in the subband group and the modulation method power code rate are obtained.
- the highest modulation class in each of the A, B, C, and D subband groups (Here, the modulation class corresponding to subband D is the highest), and 8PSK is used as the uniform modulation parameter for the entire subband group.
- the sum of the number of transmission information bits in each of the four subbands A, B, C, and D obtained by estimation is obtained as the number of information bits transmitted in the subband group.
- a weighting operation may be performed on this numerical value. For example, if the channel fluctuation is relatively fast! Since the error of the estimated channel characteristics becomes relatively large, the sum of the number of transmission information bits in the four subbands A, B, C, and D is obtained. After that, weighting by 0.9 is performed, and the total number of information bits in the subband is (0 + 25 6 + 512 + 768) * 0.9 1382.
- the parameter feedback in step 921 is obtained by acquiring the adaptive parameter of each subband group of OFDM on the receiving side, and then returning it to the transmitting side through the feedback channel. Based on this parameter on the transmitting side, the actual operation is performed. I do.
- the transmitting side allocates a number of transmission information bits corresponding to each subband group based on the adaptive parameters in each OFDM subband group fed back from the receiving side, and for each corresponding parameter.
- joint coding and modulation are performed within each subband group (step 911). For example, based on the above assumption, joint modulation and sign key are performed on a subband group formed by four subbands A, B, C, and D. In that case, modulation and sign key parameters are used. Are 8PSK and 1Z 4Turbo codes.
- the modulated symbols are assigned to the corresponding subbands of OFDM and transmitted (step 912).
- serial Z parallel conversion in the serial Z parallel conversion 302 is performed.
- Inverse fast Fourier transform in inverse fast Fourier transform unit 303 parallel / serial conversion in normal Z serial converter 304, and insertion of guard interval in guard interval insertion unit 305.
- the receiving side first removes the guard interval at the guard interval removal 315, the normal Z serial conversion at the serial Z parallel conversion 314, and the high speed FO.
- the data in each subband group of the received OFDM is obtained by performing fast Fourier transform in the Rie transform unit 313, parallel Z serial conversion in the parallel Z serial conversion 312 and controlling the parallel Z serial conversion 312. Is extracted based on the combination pattern of subbands (step 904), and then adaptive demodulation and decoding are performed for each subband group according to the adaptive parameters in each subband group acquired in the first stage.
- the original data to be sent automatically (step 9 05).
- the present invention performs combination and joint code for each subband of OFDM, and efficiently uses the diversity capability between the subbands, thereby making it possible to use the system's vector utilization rate, particularly fast fading and Effectively improves spectrum utilization under channel estimation errors, and reduces adaptation difficulty and feedback overhead.
- FIG. 11 is a diagram showing the results of comparing the performances of the method of the present invention and the conventional method under different feedback delay times.
- FIG. 12 is a diagram showing a result of comparing the performance of the method of the present invention and the conventional method under different channel estimation errors.
- the signal bandwidth of the OFDM system is 10 MHz
- the total number of subcarriers is 1024 and is divided into 16 subbands
- each subband spans 8 OFDM symbols in the time domain.
- Cyclic system convolution (RSC) polynomial in the amount of Turbo code is (13, 11), 4th order iteration for decoding, and maximum posterior probability
- the channel model used for simulation is M.1225 in-vehicle channel model A.
- a method for combining all subbands is used, and an average signal-to-noise ratio parameter estimation method is used for one subband.
Abstract
Description
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EP05807089.7A EP1811700B1 (en) | 2004-11-19 | 2005-11-18 | Communication apparatus, communication system, and communication method |
JP2006545166A JP4838144B2 (ja) | 2004-11-19 | 2005-11-18 | 通信装置、通信システム及び通信方法 |
US11/719,611 US7848439B2 (en) | 2004-11-19 | 2005-11-18 | Communication apparatus, communication system, and communication method |
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EP (2) | EP1811700B1 (ja) |
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CN1780278A (zh) | 2006-05-31 |
US20090147866A1 (en) | 2009-06-11 |
EP3306847A3 (en) | 2018-06-06 |
EP1811700A4 (en) | 2012-05-23 |
JPWO2006054697A1 (ja) | 2008-06-05 |
JP4838144B2 (ja) | 2011-12-14 |
US7848439B2 (en) | 2010-12-07 |
EP1811700A1 (en) | 2007-07-25 |
EP3306847A2 (en) | 2018-04-11 |
EP1811700B1 (en) | 2017-06-14 |
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