TWI424722B - Method and device for data transmission of orthogonal frequency multiplexing access system - Google Patents

Description

Orthogonal frequency division multiplexing access system data transmission method and device

The invention relates to a low complexity data transmission method and device designed for orthogonal frequency division multiplexing access system, in particular to demodulation and equalization processing of signals in time domain, which is different from traditional utilization. Fast Fourier Transform (FFT) is a method of processing in the frequency domain. The design of the present invention can be applied to both the transceiver architecture in single-antenna and multi-antenna communication systems.

Traditional communication systems use only a single carrier to transmit data, and the entire available bandwidth is only used by one user to transmit data. Orthogonal frequency division multiplexing system is a multi-carrier modulation transmission technology. The modulation method is to cut the entire available bandwidth into N equal parts, and use 1 subcarrier to transmit data every 1 division. . Since this technique uses orthogonal carriers that are orthogonal to each other to transmit data, and different subcarriers can be distributed to different users, it is called orthogonal frequency division multiplexing. Orthogonal frequency division multiplexing system with high spectrum efficiency, resistance selective frequency fading, multipath Fading, and Inter-Symbol Interference , ISI), can use a simple frequency domain equalizer (FDE), can use adaptive transmission mechanism, simplify the design of the receiver and many other advantages. Based on the above advantages, most of the new generation of wireless communication systems use orthogonal frequency division multiplexing system as the air interfacing technology, including wireless area network (IEEE 802.11a/g/n Wireless Local Area Network, WLAN), wireless. Metropolitan Area Network (IEEE 802.16 Worldwide Interoperability for Microwave Access, WiMAX), Digital Video Broadcasting System for Terrestrial/Handheld (DVB-T/H), Ultra Wide Band System (UWB), 3GPP 3.9 3rd Generation Partner Project for Long-Term Evolution (3GPP LTE), and 3GPP 4G (LTE-Advanced) standards.

In the wireless mobile communication environment, it is affected by multipath interference, wireless channel attenuation (Fading), frequency offset, phase noise, and Additive White Gaussian Noise (AWGN). , which causes an error in detecting the bit. In order to overcome the influence of the wireless channel, the characteristics of the channel must be estimated at the receiving end, and the effect of the wireless channel is compensated by the technique of digital signal processing. The method and device for this compensation is a so-called equalizer. The method of channel estimation can be divided into frequency domain and time domain channel estimation methods according to the domain it calculates. In the time domain, we want to estimate the Channel Impulse Response (CIR), which is the position and size of the multipath in time. In the frequency domain, we want to estimate the channel frequency response (CFR), which is the distribution of the impulse response in the frequency domain. As for the estimation part of the channel pulse/frequency response, it is usually assisted by a training sequence or a pilot signal, and the linear interpolation method and the maximum similarity method (Maximum Likelihood) are used. , ML), and a known method such as Linear Minimum Mean Squared Error (LMMSE). Since the rotation integral in the time domain is equivalent to the multiplication in the frequency domain, after the channel frequency response is estimated, the effect of the channel can be eliminated by dividing the received signal directly by the channel frequency response. This is called the Zero-Forcing technique. In addition, a more complex linear minimum mean square error method can be used to obtain better results. Conventionally, in the orthogonal frequency division multiplexing access system, the data is received in the frequency domain, and the fast Fourier transform is used to perform signal conversion between the time domain and the frequency domain. Similar concepts are mentioned in the following Taiwan patents. : 200501646, 200541251, 200605845, 200711413, 200740155, 200830771, 200832977, and 201002001, and the like. However, the method adopted by the above invention needs to convert the entire orthogonal frequency division multiplex symbol (Symbol) to the frequency domain, and then take out the resource block allocated by the system, and the number of secondary carriers included in the resource block is only It is a small part of the number of subcarriers included in the entire orthogonal frequency division multiplex symbol, so it is less efficient and more complicated. For example, in the 3GPP LTE standard, the number of secondary carriers included in the entire orthogonal frequency division multiplex symbol is 2048, and the number of secondary carriers included in one resource block is 12.

It can be seen that there are still many shortcomings in the above-mentioned methods of use, which is not a good design, but needs to be improved.

In view of the shortcomings derived from the above-mentioned conventional methods, the inventor of the present invention has improved and innovated, and after years of painstaking research, he finally succeeded in research and development of the data transmission of the multi-antenna orthogonal frequency division multiplexing system. Method and device.

[Object of the Invention]

The object of the present invention is to provide a device and a method and a device for transmitting and receiving data designed by an orthogonal frequency division multiplexing access system, which are arranged in a comb configuration manner at a transmitting end of an orthogonal frequency division multiplexing access system. One or more sets of resource blocks are allocated to the users who need to transmit data, and the resource blocks are taken out at the user receiving end by using the resource blocks in the time domain orthogonal characteristics, and other resource blocks are eliminated.

The second object of the present invention is to eliminate the interference between received signals caused by multiple paths by using the channel matrix formed by the channel pulse wave response in the time domain. Finally, the Fourier transform is used to convert the signal from the time domain back to the frequency domain and complete the reception of the signal. The estimated portion of the channel impulse response is estimated by the aid of known pilot signals. The design of the present invention can be applied to both the transceiver architecture in single-antenna and multi-antenna communication systems.

The method for transmitting and receiving data of the orthogonal frequency division multiplexing access system for achieving the above object of the invention is firstly arranged at the transmitting end of the orthogonal frequency division multiplexing access system, and is arranged in a comb configuration manner in the frequency domain. Multiple sets of resource blocks are given to users who need to transfer data. A resource block is composed of a plurality of secondary carriers and is a basic unit of radio resource configuration. The concept of group configuration simplifies the configuration of radio resources and reduces the transmission of control signals. The product of the number of secondary carriers included in a resource block and the number of available resource blocks is equal to the length of the fast Fourier transform, but generally the guard frequency bands (Guard Bands) on both sides of the reserved center frequency for waveform shaping (Pulse Shaping) ) To reduce the interference to adjacent frequency signals, only some of the available resource blocks will be used in practice. The so-called comb configuration refers to grouping subcarriers within the available bandwidth at the same frequency interval, and the product of the frequency interval and the number of subcarriers in the resource block is equal to the available bandwidth. The resource block generated by the comb configuration is a periodic signal in the time domain after the inverse fast Fourier transform (IFFT), and the period is the sampling time and the number of subcarriers in the resource block. product. After all the resource blocks are configured, they are combined and then subjected to orthogonal frequency division multiplexing modulation processing.

At the user receiving end, the received signal is the data of all the resource blocks mixed together. The prior art practice is to use the fast Fourier transform to convert the received signal from the time domain back to the frequency domain, and then take out the assigned resource block. This practice is less efficient for users who only need to retrieve one of the resource blocks. Using comb configuration techniques of resource blocks, resource blocks have orthogonal characteristics in the time domain. Therefore, the present invention proposes to utilize the orthogonal characteristic to multiply the periodic signal by a specific phase rotation sequence at the user receiving end, thereby taking out the allocated resource block and eliminating other resource blocks. Since the method does not need to solve the data of all resource blocks, it only processes the resource blocks assigned by the system, thereby greatly reducing the complexity of the receiver and improving the receiving efficiency.

The device for transmitting and receiving data of the orthogonal frequency division multiplexing access system proposed by the invention comprises five major units: a resource block extractor, a channel pulse wave response estimator, a channel matrix generator, a time domain equalizer, And the Fourier converter. First, the received fundamental frequency digital signal is input to the resource block extractor, and the user's resource block is taken out from the received signal by using the orthogonal principle. The above synchronous actions can be implemented using conventional techniques, such as a Matched Filter and a Sliding Correlator. Next, an unknown pilot pulse signal is used to estimate the unknown channel pulse wave response in the channel pulse wave response estimator. The pilot signal here is composed of one or more groups of resource blocks, and the channel pulse wave response can be obtained by the same method as the foregoing resource block grabber. Then, in the channel matrix generator, based on the results obtained by the channel pulse response estimator, a channel matrix is generated for subsequent equalization processing. In general, the length of the channel pulse response will be greater than the length of the resource block, so the Wrapped CIR is required to conform to the channel effect actually encountered by the resource block during the radio channel transmission. Then, in the time domain equalizer, the channel matrix is used to eliminate the signal interference caused by the multiple paths, and the elimination method may be Zero-Forcing technology or linear minimum mean square error method. In the orthogonal frequency division multiplexing access system, the conventional equalization processing is performed in the frequency domain. According to the foregoing technique for extracting resource blocks in the time domain, the present invention further proposes to simultaneously perform equalization processing in the time domain, on the one hand, maintaining a design of a high efficiency and low complexity receiver architecture, and on the other hand, obtaining a conventional frequency. The equalization process performed in the field has the same effect. Finally, the Fourier converter is used to restore the equalized signal to the data in the frequency domain to complete the demodulation and reception of the data. If the length of the resource block is a power of 2, a fast Fourier converter can be further used to obtain a lower complexity effect.

The invention relates to a low complexity data transmission method and device designed for an orthogonal frequency division multiplexing access system, which is assigned in a comb configuration manner at a transmitting end of an orthogonal frequency division multiplexing access system. A plurality of sets of resource blocks are used by a user who needs to transmit data, and at the user receiving end, the resource blocks are used to extract the allocated resource blocks in the time domain orthogonal characteristics, and other resource blocks are eliminated, and this method has It is different from the traditional practice of using Fast Fourier Transform to process in the frequency domain. In addition, the present invention proposes to use the channel matrix formed by the channel pulse wave response in the time domain to eliminate the interference between the received signals caused by the multiple paths. Finally, the Fourier transform is used to convert the signal from the time domain back to the frequency domain and complete the reception of the signal.

Referring to FIG. 1 , the architecture diagram of the orthogonal frequency division multiplexing access system of the present invention includes a pilot signal block 101, a resource block 1 102, a resource block R 103, a reserved block 104, and a secondary carrier. Configuration unit 105, orthogonal frequency division multiplexing modulator 106, intermediate frequency/radio frequency transmitter 107, radio channel 108, intermediate frequency/RF receiver 1 109, orthogonal frequency division multiplexing demodulator 1 110, data The detector 1 111, the intermediate frequency/RF receiver N _rb 112, the orthogonal frequency division multiplexing demodulator N _rb 113, and the data detector N _rb 114. The upper half of the figure is the transmitter part, the lower part is the receiver part, and the middle is the radio channel that passes through the radio wave transmission process. The resource block configures the basic unit for the radio resource, and the system assigns one to several resource blocks to the user requesting the spectrum resource. A resource block includes a plurality of subcarriers. For example, a resource block in a 3GPP LTE system includes 12 subcarriers, which is equivalent to a spectrum resource of 180 kHz, and a resource of a PUSC (Partial Usage of Sub-Channels) architecture in an IEEE WiMAX system. The block contains 24 subcarriers, which is equivalent to 263KHz spectrum resources. FIG resource block in a spectrum resource for all resource blocks 1102 to N _rb N _rb represents the system resource blocks 103, N _rb 3GPP LTE system is at most 110, N _rb in IEEE WiMAX System The maximum pilot signal block 101 in FIG. 1 is used to transmit a known pilot signal, which can provide an offset between the characteristics of the channel estimated by the receiving end and the time frequency. The reserved block 104 in FIG. 1 does not place any data for use as a guard band for waveform shaping to reduce interference to adjacent frequency signals. The above three blocks will be sent to the secondary carrier configuration unit 105 for the configuration of the secondary carrier.

FIG. 2 is a schematic diagram of a subcarrier configuration in the frequency domain proposed by the present invention. The so-called comb configuration refers to grouping subcarriers within the available bandwidth at the same frequency interval, and the product of the frequency interval and the number of subcarriers in the resource block is equal to the available bandwidth. In FIG. 2, N _rb represents the number of resource blocks, and N _bk represents the number of subcarriers in the resource block, and the product of the two is the length N ₀ of the orthogonal frequency division multiplex symbol. Vertical arrows represent the location of the data, and open circles represent nothing. Figure 2: The distance between the vertical arrows in the same resource block is the number of resource blocks N _rb , and the vertical arrows in any resource block are staggered from the vertical arrows in other resource blocks. The data of the i- th resource block can be expressed as follows:

The resource block generated by the comb configuration is a periodic signal in the time domain after the inverse fast Fourier transform (IFFT), and the period is the sampling time and the number of subcarriers in the resource block. product. FIG. 3 is a schematic diagram of a subcarrier configuration method proposed in the present invention in the time domain. Hypothesis ( n ) is the i- th resource block, and it has the following relationship in the time domain

It can be seen from the above formula that the subcarrier configuration method proposed by the present invention has a periodicity of the amplitude of the signal of the resource block in the time domain.

The output of the subcarrier configuration unit 105 in FIG. 1 is then sent to the orthogonal frequency division multiplexing modulator 106 to perform conversion between the frequency domain and the time domain, and a Cyclic Prefix (CP) is added to avoid the neighbor. Inter Symbol Interference (ISI). The relationship between the input x ( k ) of the orthogonal frequency division multiplexing modulator 106 and the output x ( n ) is as follows:

Next, digital/analog conversion and base/intermediate/radio frequency conversion are performed in the intermediate frequency/radio frequency transmitter 107. Finally, the antenna is transmitted into the radio channel 108 to complete the signal processing at the transmitting end. At the receiving end, each receiver sequentially sends signals to the intermediate frequency/RF receiver 109/112, the orthogonal frequency division multiplexing demodulator 110/113, and the data detector 111/114 to demodulate and detect each. Information and compensate for the channel effects of their respective encounters. Next, the low complexity data demodulation method and apparatus designed by the present invention for the above system will be described, in particular, the part of the orthogonal frequency division multiplexing demodulator 110/113.

Please refer to FIG. 4, which is a block diagram of a receiver of the orthogonal frequency division multiplexing access system of the present invention, including five major units: a resource block extractor 401, a channel pulse wave response estimator 402, and a channel matrix generator 403. The time domain equalizer 404 and the Fourier transformer 405. First, the received fundamental frequency digital signal is input to the resource block extractor 401, and the user's resource block is taken out from the received signal by using the orthogonal principle. The signal received by the receiving end can be expressed as follows:

among them, Is a N _bk × 1 vector signal. Therefore, the operation principle of the resource block extractor 401 is as follows:

among them ( n ) represents the output of the resource block extractor 401. FIG. 5 is a detailed structural diagram of the resource block extractor 401. The delay 501 in FIG. 5 represents the delay of the N _bk sampling point, and the phase rotator 502 is used to multiply the output of each delay 501 by the respective coefficients to change the phase, and finally add all the phase rotators in the adder 503. The output of 502.

The output of the resource block extractor 401 is the resource block to which the receiver is assigned, and other resource blocks have been eliminated. Next, radio channel estimation is performed in the channel pulse response estimator 402 using known pilot signals. Since the pilot signal is also assigned in the form of a resource block, the pilot signal and the channel frequency response it represents can be taken out by the same method as the resource block extractor 401. Hypothesis For the resource block of the pilot signal, For the output of the channel pulse response estimator 402, the relationship between the two can be expressed as:

Where A ^(p) is the channel matrix, and its content is the channel pulse response of the package. For background noise vector. The A ^(p) channel matrix is as follows:

In the above formula The pulse response of the channel for the package. In general, the length of the channel pulse wave response will be greater than the length of the resource block, so the channel pulse wave response needs to be wrapped to conform to the channel effect actually encountered by the resource block during the radio channel transfer process. In the subsequent equalization process, it is not necessary to find the true channel pulse wave response, and only the A ^(p) can be used to compensate the channel effect.

Next, A ^(p) is estimated in the channel matrix generator 403. The invention proposes to use =[1,1,.........,1] The pilot signal vector of ^T , so the elements of the channel matrix can be estimated using the forward substitution method. FIG. 6 is a flow chart showing the operation of the channel matrix generator 403. First, 601, the initial value of the parameter t is set to 0 in 602. Then, use the formula in 603 to calculate ( t +1). Then, the value of the parameter t is incremented by 1 in 604 and checked in 605 if it is greater than ( N _bk -2). If no, go back to 603 and calculate the next one. ( t +1). If yes, calculate in 606 (0). Finally, the result of the above steps is used in 607 to generate a channel matrix and end the flow 608. In this example, only one pilot signal resource block is used for description. The same method can be used for multiple groups of pilot signal resource blocks, so that a more accurate channel estimation can be obtained.

After the channel matrix estimation is completed, in the time domain equalizer 404, the channel matrix is used to eliminate signal interference caused by the multiple paths. In the orthogonal frequency division multiplexing access system, the conventional equalization processing is performed in the frequency domain. According to the foregoing technique for extracting resource blocks in the time domain, the present invention further proposes to simultaneously perform equalization processing in the time domain, on the one hand, maintaining a design of a high efficiency and low complexity receiver architecture, and on the other hand, obtaining a conventional frequency. The equalization process performed in the field has the same effect. According to the architecture of the present invention, the channel effect cancellation method may be a Zero-Forcing technique or a linear minimum mean square error method. Hypothesis For the signal after the i- th resource block is equalized, the transmitted data is an uncorrelated signal, and the background noise is energy. Additive White Gaussian Noise (AWGN), the above two equalization methods are shown in the following two equations:

Finally, the Fourier converter 405 is used to restore the equalized signal to the data in the frequency domain to complete the reception and demodulation of the data. The operation of the Fourier converter 405 is as follows:

If the length of the resource block is a power of 2, a fast Fourier converter can be further used to obtain a lower complexity effect.

[Features and effects]

The receiver in the traditional orthogonal frequency division multiplexing access system needs to convert the entire orthogonal frequency division multiplex symbol to the frequency domain after demodulating the resource block assigned by the system, and then take out the system assignment. Resource block. However, the number of secondary carriers included in this resource block is only a small part of the number of secondary carriers included in the entire orthogonal frequency division multiplex symbol, so the method is less efficient and more complicated. The data transmission method and device applied to the orthogonal frequency division multiplexing access system provided by the invention have the following advantages when compared with other conventional technologies:

1. The present invention does not need to solve the data of all resource blocks, and only processes the resource blocks assigned by the system, thereby greatly reducing the complexity of the receiver and improving the receiving efficiency.

2. The present invention further proposes to simultaneously perform equalization processing in the time domain, while maintaining the design of a high efficiency and low complexity receiver architecture, and on the other hand, obtaining the same effect as the equalization processing performed in the conventional frequency domain.

3. The present invention allocates one or more sets of resource blocks in a comb configuration manner at the transmitting end of the orthogonal frequency division multiplexing access system to users who need to transmit data, and obtains the benefits of frequency diversity. The effect of Deep Fading on the decentralized channel reduces the chance of a Burst Error.

The detailed description of the present invention is intended to be illustrative of a preferred embodiment of the invention, and is not intended to limit the scope of the invention. The patent scope of this case.

To sum up, this case is not only innovative in terms of technical thinking, but also has many of the above-mentioned functions that are not in the traditional methods of the past. It has fully complied with the statutory invention patent requirements of novelty and progressiveness, and applied for it according to law. Approved this invention patent application, in order to invent invention, to the sense of virtue.

101. . . Pilot signal block

102. . . Resource block 1

103. . . Resource block N _rb

104. . . Reserved block

105. . . Subcarrier configuration unit

106. . . Orthogonal frequency division multiplexing modulator

107. . . IF/RF transmitter

108. . . Radio channel

109. . . IF/RF Receiver 1

110. . . Orthogonal frequency division multiplexing demodulation transformer 1

111. . . Data detector 1

112. . . IF/RF receiver N _rb

113. . . Orthogonal frequency division multiplexing demodulator N _rb

114. . . Data detector N _rb

401. . . Resource block extractor

402. . . Channel pulse wave estimator

403. . . Channel matrix generator

404. . . Time domain equalizer

405. . . Fourier converter

501. . . Delayer

502. . . Phase rotator

503. . . Adder

Please refer to the detailed description of the present invention and the accompanying drawings, and the technical contents of the present invention and its effects can be further understood; the related drawings are:

1 is a structural diagram of an orthogonal frequency division multiplexing access system proposed by the present invention;

2 is a schematic diagram of a subcarrier configuration in a frequency domain proposed by the present invention;

FIG. 3 is a schematic diagram of a method for configuring a secondary carrier according to the present invention in a time domain;

4 is a block diagram of a receiver applied to an orthogonal frequency division multiplexing access system according to the present invention;

FIG. 5 is a structural diagram of a resource block extractor applied to a receiver of an orthogonal frequency division multiplexing access system according to the present invention; FIG.

FIG. 6 is a flow chart showing the operation of the channel matrix generator applied to the receiver of the orthogonal frequency division multiplexing access system according to the present invention.

101. . . Quantum Key Generator Type A

102. . . Quantum channel

103. . . Quantum Key Generator Type B

104. . . End router

105. . . Traditional passage

106. . . Core router

107. . . Quantum key server

108. . . Key channel

109. . . User equipment

110. . . Built-in synchronous clock function and quantum random number generator

Claims (23)

A data transmission device for orthogonal frequency division multiplexing access system, which allocates one or more groups of resource blocks in a comb configuration manner at the transmitting end of the orthogonal frequency division multiplexing access system, and utilizes resources at the receiving end The blocks are extracted from each other in the time domain orthogonal feature, and other resource blocks are eliminated, including: a secondary carrier configuration unit, configured to perform radio resources in the orthogonal frequency division multiplexing access system, to be used by multiple subcarriers The component resource block is a basic unit of radio resource configuration, and the configuration of the radio resource is simplified by the concept of group configuration, and the transmission of the control signal is reduced. The subcarrier configuration unit is configured in a comb configuration manner within the available bandwidth. The subcarriers are grouped in the same frequency interval, and the product of the frequency interval and the number of subcarriers in the resource block is equal to the available bandwidth; a resource block extractor is utilized from receiving the synchronized baseband digital signal. The orthogonal principle extracts the resource block at the receiving end and eliminates other unnecessary resource blocks; a channel pulse wave response estimator, using known pilot information Estimating the unknown channel pulse wave response; a channel matrix generator that generates a channel matrix based on the results obtained by the channel pulse wave estimator for subsequent equalization; a time domain equalizer that uses the channel matrix to eliminate multiple paths The resulting signal interference; and a Fourier converter that restores the equalized signal to the frequency domain Material, complete signal reception and demodulation. The data transmission device of the orthogonal frequency division multiplexing access system according to claim 1, wherein the resource block extractor cuts the received signal into N _{r b} blocks in units of resource blocks. Then, the orthogonal characteristics of different resource blocks are utilized, and the resource blocks are allocated by the phase rotation and addition of the resource blocks to eliminate other unnecessary resource blocks. The data transmission device of the orthogonal frequency division multiplexing access system according to claim 1, wherein the resource block extractor comprises: a. a plurality of delays, each of which can input The signal delays the Nbk sampling point, Nbk represents the number of subcarriers within the resource block; b. a plurality of phase rotators for multiplying the output of each delay by its respective coefficient to change the phase; and c. an adder, Used to sum the output of all phase rotators. The data transmission device of the orthogonal frequency division multiplexing access system according to claim 1, wherein the channel pulse wave estimator uses the resource block carrying the pilot signal for channel estimation. The data transmission device of the orthogonal frequency division multiplexing access system described in claim 1, wherein the channel pulse wave estimator operates in the same manner as the resource block extractor. The data transmission device of the orthogonal frequency division multiplexing access system according to claim 1, wherein the channel matrix generator estimates the elements of the channel matrix by means of forward iteration. The data transmission device of the orthogonal frequency division multiplexing access system according to claim 1, wherein the time domain equalizer is equalized in the time domain by using a channel matrix generated by the channel matrix generator. . The data transmission device of the orthogonal frequency division multiplexing access system according to claim 1, wherein the conversion length of the Fourier converter is equal to the length of the resource block. The data transmission device of the orthogonal frequency division multiplexing access system described in claim 1, wherein the secondary carrier configuration unit can allocate one or more groups of resource blocks to the receiving end that needs to transmit data. The data transmission device of the orthogonal frequency division multiplexing access system according to claim 1, wherein the subcarrier configuration unit has a periodic resource signal in the time domain. The period is the product of the sampling time and the number of subcarriers in the resource block. The data transmission device of the orthogonal frequency division multiplexing access system according to claim 1, wherein the secondary carrier configuration unit, the secondary carrier in the allocated resource block may retain part of the secondary carrier Use side waves that are used as guard bands and waveform shaping to reduce interference to adjacent frequency signals. The data transmission device of the orthogonal frequency division multiplexing access system according to claim 3, wherein the number of the delay devices of the resource block extractor is equal to the number of resource blocks minus one. The data transmission device of the orthogonal frequency division multiplexing access system described in claim 3, wherein the phase rotator of the resource block extractor The number is equal to the number of resource blocks minus one. The data transmission device of the orthogonal frequency division multiplexing access system according to claim 3, wherein the coefficient used by the phase rotator of the resource block extractor is an exponential function, and the phase is ( -2/N _rb )i , i is the number of the delay corresponding to the phase rotator. The data transmission device of the orthogonal frequency division multiplexing access system described in claim 3, wherein the adder of the resource block extractor is a complex adder. The data transmission device of the orthogonal frequency division multiplexing access system according to claim 3, wherein the input signal of the adder of the resource block extractor is all phase rotators and resource blocks. Input signal of the extractor. The data transmission device of the orthogonal frequency division multiplexing access system described in claim 4, wherein the pilot signal of the channel pulse wave estimator has a value of 1. The data transmission device of the orthogonal frequency division multiplexing access system described in claim 4, wherein the pilot signal of the channel pulse wave estimator is composed of one or more groups of resource blocks. . The data transmission device of the orthogonal frequency division multiplexing access system according to claim 6, wherein the channel matrix of the channel matrix generator is a wrapped channel pulse wave response. The data transmission device of the orthogonal frequency division multiplexing access system according to claim 6, wherein the step of generating the channel matrix generator comprises: a. setting an initial value of the parameter t to 0; b. utilizing Formula calculation ;c. Add 1 to the value of the parameter t and check if it is greater than ( N _bk -2); if the value of t is not greater than ( N _bk -2), return to b and calculate the next If the value of t is greater than ( N _bk -2), proceed to the next step; d. use Formula calculation And e. using the above steps synthesis The channel matrix. The data transmission device of the orthogonal frequency division multiplexing access system described in claim 7, wherein the time domain equalizer, the channel effect elimination method is a Zero-Forcing technology. For example, the data transmission device of the orthogonal frequency division multiplexing access system described in claim 7 is characterized in that the channel effect elimination method of the time domain equalizer is a linear minimum mean square error method. The data transmission device of the orthogonal frequency division multiplexing access system described in claim 8 wherein the Fourier transform has a conversion length of a power of two, and a fast Fourier transform architecture may be employed.