CN105471567B - A kind of data transmission method, transmitting website and receiving station based on OFDM - Google Patents
A kind of data transmission method, transmitting website and receiving station based on OFDM Download PDFInfo
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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
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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
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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
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/1469—Two-way operation using the same type of signal, i.e. duplex using time-sharing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W99/00—Subject matter not provided for in other groups of this subclass
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
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Abstract
The present invention provides a kind of data transmission methods based on OFDM, and for J transmitting website simultaneously to a receiving station transmission data, J is positive integer, including：Available band is divided into N number of basic sub-band by receiving station, the M respectively monopolized for J transmitting website schedulingjA basic sub-band, j ∈ [1, J],J is positive integer；J transmitting website carries out IFFT processing to respectively OFDM data to be transmitted respectively, wherein it is M that j-th of transmitting website carries out length to datajThe specimen sample rate of the IFFT processing of × K points, use is Mj×fs；To IFFT, treated that data are modulated respectively for J transmitting website, wherein j-th of transmitting website modulates data on MjOn a basic sub-band；J transmitting website is respectively in respectively exclusive MjEmit data on a basic sub-band；Receiving station receives the data that J transmitting website is sent simultaneously in the range of N number of basic sub-band, carries out the FFT processing of N × K points, the specimen sample rate of use is N × fs.This method allows bandwidth ability not peer-to-peer communications, while allowing multi-user while accessing.
Description
The application is a divisional application of a parent application with an application date of 2012, 03 and 23, an application number of 201280012991.4 and an invention name of 'an OFDM-based data transmission method and a transmitting station'.
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a method and a system for data transmission based on OFDM.
Background
In the WLAN technology based on 802.11 series standards, multi-user transmission is implemented through Carrier Sense Multiple Access (CSMA), i.e., Multiple Stations (STAs) cannot Access to a CAP at the same time, but only Access in a time-sharing manner, and even if the CAP has an idle spectrum resource, the STAs cannot use the Access. For example, in an 802.11n system, a CAP may occupy 40MHz bandwidth resources and may be divided into 2 20MHz sub-bands, and an STA can only communicate with the CAP using the entire 40MHz bandwidth or one of the 20MHz sub-bands, but two STAs supporting 20MHz bandwidths cannot respectively occupy one of the 20MHz sub-bands to communicate with the CAP at the same time, and only can communicate with the CAP using a primary channel in the 40MHz bandwidth in different time periods, and the 20MHz secondary channel is idle, which causes a waste of spectrum resources.
Orthogonal Frequency Division Multiple Access (OFDMA) is a Multiple Access method adopted in a mobile communication system, and a plurality of mobile terminals (MS) occupy different subcarrier groups in an available bandwidth to communicate with a Base Station (BS) at the same time, thereby improving the spectrum utilization.
In the existing WLAN, both the STA and the CAP must adopt the same bandwidth configuration when communicating, for example, in an 802.11n system, the STA and the CAP either adopt a bandwidth of 40MHz or a bandwidth of 20MHz when communicating, if the CAP supports a bandwidth of 40MHz in one WLAN network, and there are two STAs of 20MHz, the CAP can only adopt a bandwidth configuration of 20MHz to communicate with the STA competing for the primary channel resource, thereby causing a waste of 20MHz spectrum resource. In future wlan technologies, the bandwidth available to CAP may reach 80MHz or more, and if the above bandwidth configuration scheme is continued, it will cause more waste of spectrum resources.
In the OFDMA scheme, although multiple terminals may occupy different subcarriers to communicate with the base station simultaneously, the receiving end and the transmitting end need to support the same bandwidth configuration, that is, the number of FFT points of an Inverse Fast Fourier Transform (IFFT) module at the transmitting end and a Fast Fourier Transform (FFT) module at the receiving end must be the same. In addition, the multiple access mode of uplink OFDMA has higher requirement on synchronization. In the time domain, signals transmitted by a plurality of mobile terminals (MS) need to arrive at a Base Station (BS) at the same time so as not to cause intersymbol interference and intersymbol interference; in the frequency domain, because the carrier crystal oscillator frequency precision of a plurality of MS transmitters is different and the deviation of the carrier crystal oscillator frequency of the BS is different, the frequency offset of each MS signal reaching the BS is different, and the OFDM modulation is sensitive to the frequency offset, so that the frequency offset from each MS signal needs to be corrected to be correctly demodulated, otherwise, multi-user interference is caused. Therefore, in the OFDMA system, time synchronization and frequency synchronization are key issues, and a complex synchronization algorithm is required. In the wireless lan system, if the multiple access method of OFDMA is adopted to improve the spectrum efficiency, the equipment cost will increase.
Disclosure of Invention
The invention provides a data transmission method and a transmitting site based on Orthogonal Frequency Division Multiplexing (OFDM), which can realize simultaneous communication between a plurality of transmitting sites and a receiving site, have low complexity and can improve the frequency spectrum utilization rate and the system throughput rate.
The invention provides a data transmission method based on OFDM, which is used for J transmitting sites to transmit data to a receiving site simultaneously, wherein J is a positive integer, and the method comprises the following steps:
the receiving station divides the available frequency band into N basic frequency sub-bands, and schedules respective exclusive M for J transmitting stationsjA basic sub-band, J ∈ [1, J ]],j is a positive integer;
j transmitting sites respectively carry out IFFT processing on OFDM data to be transmitted, wherein the jth transmitting site carries out IFFT processing on the data with the length of MjIFFT processing of XK points with a sample sampling rate of Mj×fs；
J transmitting stations respectively modulate the data after IFFT processing, wherein the jth transmitting station modulates the data to MjA plurality of basic frequency sub-bands;
j transmitting sites respectively in respective exclusive MjTransmitting data on a plurality of fundamental sub-bands;
receiving stationSimultaneously receiving data sent by J transmitting sites in the range of N basic sub-bands, and carrying out FFT processing of N multiplied by K points, wherein the sampling rate of the adopted samples is N multiplied by fs。
Preferably, the receiving station generates a control signaling, which includes a bitmap for indicating the J basic subbands to be scheduled; sending the control signaling; each transmitting station analyzes the bitmap for indicating the scheduled basic frequency sub-band by receiving the control signaling, and knows the scheduled MjA basic sub-band.
Preferably, the receiving station sets a bit group for each transmitting station, wherein the bit group is used for indicating basic subband scheduling, and each bit corresponds to one basic subband; m to be scheduled according to the result of the basic sub-band schedulingjSetting M bits corresponding to the basic frequency sub-bands as a first value; sending the bit group to a corresponding transmitting station through a control signaling; the transmitting station receives the control signaling and obtains a bit group for indicating the scheduling of the basic sub-band, wherein each bit corresponds to one basic sub-band; according to M set as a first value in the bit groupjEach bit knows that the corresponding M basic subbands are scheduled.
Preferably, said jth transmitting station modulates data to said MjOn each basic frequency sub-band, independently transmitting on each basic frequency sub-band; alternatively, data is modulated to said MjTransmitting on a combined frequency band of the plurality of elementary sub-bands on said combined frequency band; wherein, M isjThe elementary subbands are contiguous elementary subbands.
Preferably, virtual subcarriers are arranged at two ends of each subband; alternatively, virtual subcarriers are provided at both ends of the combined frequency band.
The invention provides a receiving station, comprising:
a scheduling module for dividing the available frequency band into N basic sub-bands and scheduling the J transmitting sites with respective exclusiveMjA basic sub-band, J ∈ [1, J ]],J and J are positive integers;
a receiving module, configured to receive data sent by J transmitting stations simultaneously within the range of N basic sub-bands, and perform N × K FFT processing, where the sample sampling rate is N × fs。
Preferably, the scheduling module is configured to generate a control signaling, which includes a bitmap for indicating the J basic subbands to be scheduled, and send the control signaling; or, setting a bit group for indicating basic subband scheduling for each transmitting station, wherein each bit corresponds to one basic subband; m to be scheduled according to the result of the basic sub-band schedulingjSetting M bits corresponding to the basic frequency sub-bands as a first value; and sending the bit group to a corresponding transmitting site through a control signaling.
The invention provides a transmitting station, comprising:
a receiving module for obtaining M scheduled by the receiving stationjInformation indicating a basic sub-band, J ∈ [1, J ∈ [ ]],J and J are positive integers; n is the number of basic sub-bands contained in the available frequency band of the system;
a processing module for processing the OFDM data to be transmitted with the length of MjIFFT processing of XK points with a sample sampling rate of Mj×fs；
A modulation module for modulating the IFFT processed data to MjA plurality of basic frequency sub-bands;
a transmitting module for transmitting the signal at MjData is transmitted on a primary sub-band.
Preferably, the first and second liquid crystal films are made of a polymer,the receiving module analyzes the bitmap for indicating the scheduled basic sub-band by receiving a control signaling, and obtains the scheduled MjA plurality of elementary sub-bands; or, a bit group for indicating the basic frequency band scheduling is obtained by receiving a control signaling, wherein each bit corresponds to a basic frequency band; according to M set as a first value in the bit groupjEach bit knows that the corresponding M basic subbands are scheduled.
Preferably, the transmitting module is configured to modulate data to the MjOn each basic frequency sub-band, independently transmitting on each basic frequency sub-band; alternatively, data is modulated to said MjTransmitting on a combined frequency band of the plurality of elementary sub-bands on said combined frequency band; wherein, M isjThe elementary subbands are contiguous elementary subbands.
Preferably, virtual subcarriers are arranged at two ends of each subband; alternatively, virtual subcarriers are provided at both ends of the combined frequency band.
In summary, the technical solution provided in the present invention, based on the OFDM technology and the combined use of sub-bands, allows the transmitting station STA and the receiving station CAP in the wireless communication system to have different bandwidth configurations, the transmitting station STA can adopt a lower configuration to reduce the hardware implementation cost, and the receiving station CAP can adopt a higher configuration to improve the efficiency: spectrum utilization rate, throughput rate, etc., and can realize that a plurality of STAs communicate with the CAP at the same time. In addition, a guard band, namely a virtual carrier, is added at the edge of the sub-band, so that the interference between the sub-bands can be avoided, each sub-band can be independently made into filtering, and a receiving end only needs to perform matched filtering on the whole frequency band and does not need a plurality of baseband receivers to perform matched filtering aiming at different sub-bands; the Cyclic Prefix (CP) is expanded, and the requirement of time synchronization is reduced. The sampling rate of the baseband samples of the receiving end is N times of the sampling rate of the basic sub-band samples, so that the basic sub-band only needs an IFFT/FFT module with N1 points, and the receiving end uses the IFFT/FFT module with N2N 1 points instead of a plurality of parallel IFFT/FFT modules with N1 points to demodulate the information of each sub-band. Therefore, the frequency spectrum utilization rate and the system throughput rate can be improved, a plurality of STAs can communicate with the CAP at the same time, and the cost of the system and the cost of user station equipment do not need to be increased.
For the purposes of the foregoing and related ends, the one or more embodiments include the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative aspects and are indicative of but a few of the various ways in which the principles of the various embodiments may be employed. Other benefits and novel features will become apparent from the following detailed description when considered in conjunction with the drawings and the disclosed embodiments are intended to include all such aspects and their equivalents.
Drawings
Fig. 1 is a flowchart of a data transmission method based on OFDM according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating a wireless communication system architecture according to the prior art;
FIG. 3 is a block diagram of baseband parts of a multiband OFDM transmitting end and a receiving end according to an embodiment of the present invention;
FIGS. 4(a), (b), (c) and (d) are schematic diagrams of several sub-band divisions according to embodiments of the present invention;
FIGS. 5(a) and 5(b) are schematic diagrams of another two sub-band divisions in FIG. 4 (b);
fig. 6 is a block diagram of a transmitting station according to an embodiment of the present invention;
fig. 7 is a block diagram of a receiving station according to an embodiment of the present invention;
fig. 8 is a block diagram of an apparatus for transmitting a resource indication according to an embodiment of the present invention;
fig. 9 is a block diagram of a receiving apparatus for resource indication according to an embodiment of the present invention;
FIG. 10 is a block diagram of an apparatus for transmitting a resource indication according to another embodiment of the present invention;
fig. 11 is a block diagram of another apparatus for receiving a resource indication according to an embodiment of the present invention.
Detailed Description
The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of embodiments of the invention encompasses the full ambit of the claims, as well as all available equivalents of the claims. Embodiments of the invention may be referred to herein, individually or collectively, by the term "invention" merely for convenience and without intending to voluntarily limit the scope of this application to any single invention or inventive concept if more than one is in fact disclosed.
In view of the deficiencies in the prior art, the present invention provides a multi-user data transmission scheme for medium and short distance wireless communication, which equally divides the available frequency band of the system into N basic sub-bands (also referred to as sub-channels) based on OFDM and a corresponding synchronization mechanism by using a multi-user access scheme similar to OFDMA, wherein the bandwidth of a transmitting end (i.e., STA) transceiver may be the basic sub-band or a frequency band of a combination of sub-bands, and the bandwidth of a receiving end (i.e., CAP) transceiver may be the N basic sub-bands according to specific situations. The basic sub-band is assumed to be 20MHz, the receiving site transceiver bandwidth can be 20MHz,40MHz and 80MHz, namely, for the STA receiver only supporting 20MHz bandwidth, the invention can also receive and transmit CAP signal of 80MHz bandwidth, thus, the invention can realize that a plurality of STAs can communicate with CAP by using different sub-band resources based on OFDM modulation technology, and reduce the time-frequency synchronization requirement and synchronization precision required by OFDMA system.
The data transmission method based on OFDM provided by the present invention is used for J transmitting stations to transmit data to one receiving station at the same time, J is a positive integer, as shown in fig. 1, the method includes:
step S101: the receiving station divides the available frequency band into N basic frequency sub-bands, and schedules respective exclusive M for J transmitting stationsjA basic sub-band, J ∈ [1, J ]],j is a positive integer;
step S102: j transmitting sites respectively carry out IFFT processing on OFDM data to be transmitted, wherein the jth transmitting site carries out IFFT processing on the data with the length of MjIFFT processing of XK points with a sample sampling rate of Mj×fs；
Step S103: j transmitting stations respectively modulate the data after IFFT processing, wherein the jth transmitting station modulates the data to MjA plurality of basic frequency sub-bands;
step S104: j transmitting sites respectively in respective exclusive MjTransmitting data on a plurality of fundamental sub-bands;
step S105: the receiving station receives the data sent by J transmitting stations in the range of N basic sub-bands at the same time, and performs FFT processing of N multiplied by K points, and the sampling rate of the adopted samples is N multiplied by fsAnd obtaining the data sent by each transmitting station.
Transmitting site j supports at least MjA bandwidth of the base sub-band; the receiving station supports at least the bandwidths of the N fundamental sub-bands. For example, a STA supporting an 80MHz bandwidth may occupy 20MHz,40MHz, or 80MHz to transmit data. Similarly, a CAP supporting an 80MHz bandwidth may also receive data in the 20MHz,40MHz, or 80MHz range.
M abovejAnd N parameter configuration byMedia Access control layer (MAC) layer implementation, MjThe value of (a) can be configured by the CAP according to the bandwidth capability and allocable resources supported by the jth STA. The value of N is configured by CAP according to the requirement of bandwidth resource. In a specific implementation, the STA may send a resource request to the CAP, where the resource request carries a bandwidth capability supported by the STA, and the CAP configures, according to the bandwidth capability supported by the STA and a current allocable resource, a basic subband for the STA, and carries information of the basic subband configured for the STA to the STA by sending a response message. The STA can package the resource request into an independent resource request frame and initiate the resource request to the CAP in a competition mode; the resource request may also be sent to the CAP along with the data frame when the data frame is transmitted upstream. In addition, the CAP may also allocate uplink transmission resources to the STAs in a polling manner.
Preferably, the transmitting station may send the resource request on a basic sub-band to improve transmission resource utilization.
An embodiment of the present invention provides a resource indication method, where a CAP schedules transmission resources for an STA, and the method specifically includes:
step 1: scheduling one or more subchannels;
step 2: generating a control signaling comprising a bitmap for indicating one or more sub-channels to be scheduled;
and step 3: and sending the control signaling.
The sub-channel may be a sub-carrier in a carrier aggregation system, or may be a sub-channel (also referred to as a basic sub-band) in a spectrum aggregation system.
The resource indication method is suitable for uplink resource indication and is also suitable for downlink resource indication.
Correspondingly, the embodiment of the present invention further provides a resource indication method, where the STA identifies a resource indication and transmits data on a scheduled resource, and the method specifically includes:
step 1: receiving a control signaling, analyzing a bitmap for indicating the scheduled sub-channels, and obtaining one or more scheduled sub-channels;
step 2: communicating information on the scheduled one or more subchannels.
The resource indication method is suitable for uplink resource indication and is also suitable for downlink resource indication. In connection with the STA uplink transmission of the present invention: the CAP schedules transmission resources for J STAs, and for any STA: CAP according to M scheduled for jth STAjA basic sub-band for generating a control signaling including M for indicating the scheduling for the jth STAjA bitmap of the elementary subbands; and sending the control signaling. After receiving the control signaling, the corresponding STA analyzes the bitmap for indicating the scheduled basic sub-band to obtain the M scheduled for the corresponding STAjA plurality of elementary sub-bands; m in scheduling for itjData is communicated on one of the fundamental sub-bands.
The embodiment of the present invention further provides another resource indication method, including:
step 1: setting a bit group for indicating subchannel scheduling, wherein each bit corresponds to a subchannel;
step 2: setting one or more bits corresponding to one or more scheduled sub-channels as a first value according to the result of the sub-channel scheduling;
and step 3: and sending the bit group through a control signaling.
The sub-channel may be 1 sub-carrier in a carrier aggregation system, or may be one sub-channel in a spectrum aggregation system.
Correspondingly, the embodiment of the present invention further provides a resource indication method, where the STA identifies a resource indication and transmits data on a scheduled resource, and the method specifically includes:
step 1: receiving a control signaling;
step 2: obtaining a bit group for indicating subchannel scheduling, wherein each bit corresponds to a subchannel;
and step 3: obtaining that one or more corresponding sub-channels are scheduled according to one or more bits set as a first value in the bit group;
and 4, step 4: communicating information on the scheduled one or more subchannels.
The resource indication method is suitable for uplink resource indication and is also suitable for downlink resource indication. In connection with the STA uplink transmission of the present invention: the CAP presets a bit group for indicating basic sub-band scheduling, wherein each bit corresponds to a basic sub-band; the CAP schedules transmission resources for one or more STAs, and for any STA: CAP according to M scheduled for jth STAjOne basic sub-band, M to be scheduledjM corresponding to each basic sub-bandjAnd setting the bit as a first value, and sending the bit group through a control signaling. After receiving the control signaling, the corresponding STA obtains a bit group for indicating basic subband scheduling, and according to M set as a first value in the bit groupjEach bit knows the corresponding MjThe base sub-bands are scheduled; at the scheduled MjInformation is conveyed on one of the elementary subbands.
To further illustrate the resource allocation indication scheme provided by the present invention, a specific uplink and downlink scheduling signaling field is provided herein for allocating uplink or downlink transmission resources, see table 1.
TABLE 1
Wherein the 20MHz subchannel location for which the scheduling signaling is valid is indicated using b5b4b3b 2. b2Indicating that this scheduling is valid for subchannel 0 and invalid otherwise. b3This scheduling is indicated as valid for subchannel 1, otherwise invalid. b4This scheduling is indicated by 1 to be valid for subchannel 2 and otherwise invalid. b5This scheduling is indicated by 1 to be valid for subchannel 3, otherwise invalid.
The embodiment of the invention provides a simple resource allocation mode facing to carrier aggregation, and the bitmap is used for indicating the component carrier to which the resource allocation indication is suitable in the resource allocation indication signaling, so that the control signaling overhead is saved, and the control signaling detection complexity is reduced.
The implementation of the present invention to allow STAs with different supported bandwidth capabilities to communicate with the CAP will be described in detail below.
The jth transmitting station can modulate the data to the MjOn each elementary sub-band, independently transmitted. The jth transmitting station may also modulate data to the MjThe basic sub-bands are transmitted on a combined frequency band. Wherein, M isjThe elementary subbands are contiguous elementary subbands. Preferably, a plurality of transmitting sites can share the same basic sub-band by adopting a space division multiplexing mode.
In the data transmission method provided by the embodiment of the invention, when a plurality of transmitting stations transmit data, carrier frequency offsets are respectively set for the transmitting stations so as to determine the carrier center frequencies of the transmitting stations. That is, the jth transmitting station can shift the M by spectrumjData on the individual elementary sub-bands is modulated to a designated radio frequency band. Accordingly, the receiving station receives the data of the corresponding transmitting station on the corresponding radio frequency band.
In the data transmission method provided by the invention, the baseband part adopts Inverse Fast Fourier Transform (IFFT)/Fast Fourier Transform (FFT) to process, and the receiving station adopts the FFT length different from that of the transmitting station:
if the basic sub-band uses K-point IFFT/FFT module, if the transmitting station occupies MjThe length of IFFT/FFT module of each basic sub-band at transmitting site is MjxK points, and the IFFT/FFT block length of the receiving station is NxK points. That is, the transmitting station performs the data length of M before performing the spectrum shiftjIFFT processing of multiplied by K points; and the receiving station carries out FFT processing with the length of N multiplied by K points on the data received in the N basic sub-band ranges. Where K denotes the number of subcarriers included in one basic subband.
When the transmitting station carries out IFFT processing, the sampling rate of the adopted sample is Mj×fs(ii) a When the receiving station carries out FFT processing, the sampling rate of the adopted sample is Nxfs。fsRepresenting the input sample sampling rate of the IFFT/FFT for one fundamental sub-band.
If the transmitting station and the receiving station support the same bandwidth, the IFFT/FFT subcarrier number and the sampling rate of the transmitting station and the receiving station are the same.
If there are multiple transmitting sites in the system, the bandwidths supported by the transmitting sites are different, and on the premise of meeting the bandwidth configuration requirement, the multiple transmitting sites can transmit data to the receiving site by using the respective bandwidth configurations within the bandwidth range supported by the receiving site.
Before the jth transmitting station carries out spectrum shifting, only M needs to be carried outjAnd carrying out shaping filtering processing on the data on the basic sub-bands. Before FFT processing, the receiving station may perform matched filtering processing on the data received in the N basic sub-band ranges.
Preferably, guard bands can be set at the edges of the sub-bands to reduce filtering requirements and reduce inter-user interference. Virtual subcarriers may be provided at both ends of each subband. Preferably, virtual subcarriers may also be provided at both ends of the combined frequency band.
In the data transmission method provided in the embodiment of the present invention, when there are multiple transmitting stations transmitting data, the cyclic prefix CP length TCP of the wireless communication system is set to satisfy the following conditions:
TCP≥2δ+τm
where 2 δ is the two-way propagation delay, τ, experienced by the signal from the transmitting site to the maximum allowable coverage radiusmMultipath delay spread.
Preferably, in the embodiment of the present invention, the sub-band wideband can be 20 MHz; and/or Mj1, 2, 4; and/or k 256; and/or baseband sample sampling rate fs＝20MHz。
Preferably, MjCan take the value of MjN is a natural number. Preferably, n may be 0, 1 or 2.
The present invention is described in detail below with reference to specific embodiments in order to make the principles, features and advantages of the invention clearer.
Fig. 2 is a schematic block diagram of a transmitting end and a receiving end, and the embodiment of the present invention only relates to a part of modules of a baseband in the transmitting end and the receiving end, and therefore, modules which are not related to the present invention in the source, the rf, the sink and the baseband shown in fig. 2 are not described again here.
First, the whole frequency band of the system is equally divided into N basic sub-bands for each STA station in the system to use.
In this embodiment, the whole bandwidth of the system is W-80 MHz, which is equally divided into N-4 basic sub-bands, each basic sub-band bandwidth B is 20MHz, it is assumed that each basic sub-band can only be occupied by one transmitting station STA alone, and one STA can use one or more basic sub-bands to transmit data to the CAP. The STA supports 20MHz,40MHz and 80MHz bandwidths, the CAP supports 20MHz,40MHz and 80MHz bandwidths, and when the CAP has 80MHz bandwidth receiving capability, data transmitted by any sub-band combination can be received simultaneously. Fig. 3 is a block diagram of baseband modules when 4 stations STA1 to STA4 with 20MHz bandwidth respectively occupy different sub-bands to transmit data to a CAP with 80MHz bandwidth.
Fig. 3 shows that 4 STAs transmit data to CAP, represented by STAs 1 to 4, each STA occupying a basic sub-band, i.e., 20MHz bandwidth, and X1 to X4 represent data from the corresponding STA. Fig. 3 only shows modules closely related to IFFT/FFT when implementing multiband OFDM transmission, and other modules in a complete transceiver, such as encoding, constellation point mapping, stream parsing, channel estimation, MIMO detection, decoding, etc., are not described herein again.
The subband division in the embodiment of the present invention is shown in fig. 4 (a).
Fig. 4 is a schematic diagram of an equivalent baseband for subband division, for convenience, the negative frequency concept used in the 802.11n standard may be followed; the spectrum of negative frequencies is shifted to positive frequencies, but there is essentially no difference between the two. The CAP uses a band of [ -40MHz,40MHz ] with a bandwidth of 80MHz, and the center frequency f0 is 0. Fig. 4 illustrates only the case of a single STA antenna, and the same applies to the case where STAs and CAPs are exclusive sub-bands of multiple antennas and multiple STAs share a sub-band by space division multiplexing.
Fig. 4(a) is a schematic diagram of the frequency bands occupied by the 4 STAs in fig. 3, where f0 is 0, STA1 uses [ -40MHz, -20MHz ] band, center frequency f1 is-30 MHz, STA2 uses [ -20MHz,0MHz ] band, center frequency f2 is-10 MHz, STA3 uses [0MHz,20MHz ] band, center frequency f3 is 10MHz, STA4 uses [20MHz,40MHz ] band, and center frequency f4 is 30 MHz.
The signal model for subband division shown in fig. 4(a) is described as follows. To transmit 4 channels of 20MHz signals in parallel, each channel of signals may be separated in the frequency domain to ensure orthogonality, i.e. modulated to non-overlapping frequency bands. Number of subcarriers Nfft (number of IFFT/FFT transformed points), sampling interval Ts, and sampling frequency fsThe corresponding relationship between the two is as follows:
Turepresenting the duration of an OFDM symbol. Center frequency f of baseband signalcWhen the subcarrier spacing is Δ F of 78.125kHz at 0, the number of subcarriers Nfft (the number of IFFT/FFT transformed points) and the sampling interval T used in this embodiment are equal to each othersAnd a sampling frequency fsThe correspondence between them is shown in table 1.
TABLE 1
| Bandwidth B | Number of subcarriers Nfft | Sampling interval Ts | Sampling frequency fs |
| 20MHz | 256 | 50ns | 20MHz |
| 40MHz | 512 | 25ns | 40MHz |
| 80MHz | 1024 | 12.5ns | 80MHz |
Sampling frequency f in Table 1sFor the lowest sampling rate, values larger than those shown in table 1 may be adjusted.
In this embodiment, the center frequencies of the 4 channels of signals are respectively f 1-30 MHz, f 2-10 MHz, f 3-10 MHz, and f 1-30 MHz, and exactly occupy a continuous 80MHz channel, and the subcarrier offset values corresponding to the center frequencies of the respective channels of signals are respectively: -384 af, -128 af, 384 af.
Referring to fig. 3 and 4(a), in this embodiment, data of each STA is first subjected to IFFT conversion with Nfft1 being 256 points (number of subcarriers), a sampling interval of baseband samples (sampling interval of an IFFT module input sample point) is 50ns, then subjected to D/a (D/a part includes low-pass filtering), and then subjected to spectrum shifting, center frequencies are respectively f1 to f4, where f1 being f0-30, f2 being f0-10, f3 being f0+10, and f4 being f0+30, the unit is MHz, and the data is processed by other baseband modules, a radio frequency channel and a channel and then received by the CAP, the data received by the CAP is also processed by the radio frequency channel and other baseband modules, the sampling interval of the baseband sample point of the CAP is 12.5ns, and the data received by Nfft2 being 1024 points is subjected to FFT conversion, that is capable of taking out data of different STAs from corresponding frequency bands and performing subsequent processing.
Under the condition of not considering time deviation, frequency deviation and interference noise, the situation that a receiving end baseband receives continuous signals of different carrier frequencies is assumed as follows:
sampling the signal, and taking t as nTs
For a receiver with 80MHz bandwidth, N1024,substituting the formula to obtain:
and performing 1024-point FFT on r (n) to demodulate the signal W, X, Y, Z.
In order to ensure that the signal periods are consistent, the sampling rates of the input data of the FFT modules are different for signals with different bandwidths. In the bandwidth of 20MHz, 256-point FFT, the sampling period should be 50 ns; and under the bandwidth of 80MHz, 1024 points of FFT, the sampling period is 12.5 ns.
In the embodiment of the present invention, the sub-bands are combined for each station, for example, two sub-bands may be combined into one sub-band for use, or all sub-bands may be combined into one sub-band for use. The subband combination method in this embodiment is shown in fig. 4(b), 4(c), and 4 (d).
Fig. 4(b) shows a sub-band division that two STAs with a bandwidth of 20MHz and one STA with a bandwidth of 40MHz share an 80MHz spectrum, where the center frequencies of the three sub-bands are respectively f 1-30 MHz, f 2-0, and f 3-30 MHz. In addition, fig. 4(b) shows two further modifications, as shown in fig. 5.
Fig. 4(c) shows a sub-band division scheme in which two STAs with a bandwidth of 40MHz share an 80MHz spectrum, and the center frequencies of the two sub-bands are f 1-20 MHz and f 2-20 MHz, respectively.
Fig. 4(d) shows a sub-band division that a STA with a bandwidth of 80MHz occupies all the spectrum of 80MHz, and the center frequency of the sub-band is f1 ═ 0.
Fig. 4(b) shows a case where two STAs with 20MHz bandwidth and one STA with 40MHz bandwidth share an 80MHz spectrum, and the band distribution can also be changed, as shown in fig. 5.
When the CAP is configured for 40MHz or 80MHz bandwidth, it is allowed to have free fundamental sub-bands or combinations of fundamental sub-bands within its spectrum.
If the transmitting station and the receiving station support the same bandwidth, the IFFT/FFT subcarrier numbers and the sampling rates of the transmitting station STA and the receiving station are the same;
if there are multiple transmitting sites in the system, the bandwidths supported by the transmitting sites are different, and on the premise of meeting the bandwidth configuration requirement, the multiple transmitting sites can transmit data to the receiving site by using the respective bandwidth configurations within the bandwidth range supported by the receiving site.
For example, if the available bandwidth of the system bandwidth is 40MHz, the CAP supports 40MHz, the STA supports 20MHz or 40MHz, and the CAP supports simultaneous transmission of two STAs. If the available bandwidth of the system is 20MHz, the frequency band may also be divided continuously, and each STA uses a part of resources in the frequency band, but the center frequency of each STA is the same as CAP, and no additional spectrum shifting (center frequency offset) is performed.
Each of the sub-bands occupied by the STAs has a respective virtual sub-carrier, and is disposed at the edge (both ends) of the sub-band to serve as a guard band. Each STA only needs to do the shaping filtering over its supported bandwidth alone, rather than over the entire W. And the CAP performs shaping filtering on the whole bandwidth W, so that the CAP can flexibly support STAs with different bandwidth configurations.
In order to eliminate or minimize Inter-Symbol Interference (ISI) and multi-user Interference, a reasonable synchronization mechanism needs to be designed in the system, and specifically, a Cyclic Prefix (CP) is introduced, and the length of the CP varies with a transmission mode, a frame structure and a corresponding protocol, so that the length of the CP in the system needs to be designed to meet the requirement. In the embodiment of the invention, when receiving the downlink frame sent by the CAP of the receiving station, the transmitting station STA can determine a time point t0 according to the synchronous preamble of the downlink frame, each STA calculates the uplink transmission time by taking the respective estimated time point as the reference, and the CP length in the system is designed to ensure that the bidirectional propagation delay 2 delta and the multipath delay expansion tau from the STA with the farthest coverage distance to the CAP are ensuredmConsidering the time synchronization error, all the multi-path signals of the STA can be in the CP rangeInter-arrival STAs, without causing inter-symbol interference (ISI) and multiuser interference.
In the embodiment of the invention, when a plurality of transmitting stations transmit data, the cyclic prefix CP length TCP of the wireless communication system is set to meet the following conditions:
TCP≥2δ+τm。
an embodiment of the present invention further provides a transmitting station, as shown in fig. 6, including:
a receiving module 601, configured to obtain M scheduled by a receiving station for the receiving stationjInformation indicating a basic sub-band, J ∈ [1, J ∈ [ ]],J and J are positive integers; n is the number of basic sub-bands contained in the available frequency band of the system;
a processing module 602, configured to perform length M on OFDM data to be transmittedjIFFT processing of XK points with a sample sampling rate of Mj×fs；
A modulation module 603 for modulating the IFFT processed data to MjA plurality of basic frequency sub-bands;
a transmitting module 604 for transmitting the signal at the MjData is transmitted on a primary sub-band.
Preferably, the receiving module 601, by receiving a control signaling, parses the bitmap for indicating the scheduled basic sub-band to obtain the scheduled MjA plurality of elementary sub-bands; or,
obtaining a bit group for indicating basic subband scheduling by receiving a control signaling, wherein each bit corresponds to a basic subband; according to M set as a first value in the bit groupjEach bit knows that the corresponding M basic subbands are scheduled.
Preferably, the transmitting module 604 is used for transmittingData modulation to said MjOn each basic frequency sub-band, independently transmitting on each basic frequency sub-band; alternatively, data is modulated to said MjTransmitting on a combined frequency band of the plurality of elementary sub-bands on said combined frequency band; wherein, M isjThe elementary subbands are contiguous elementary subbands.
Preferably, the transmitting module 604 further sets virtual subcarriers at two ends of each of the subbands; alternatively, virtual subcarriers are provided at both ends of the combined frequency band.
Preferably, the transmitting module 604 may also share the same basic sub-band with other transmitting stations by using space division multiplexing.
Preferably, the bandwidth of the fundamental sub-band is 20 MHz.
Preferably, K is 256.
Preferably fs-20 MHz.
Preferably, M is 2n, and n is a natural number. Preferably, n is 0, 1 or 2.
An embodiment of the present invention further provides a receiving station, as shown in fig. 7, including:
a scheduling module 701, configured to divide an available frequency band into N basic sub-bands, and schedule M exclusive to J transmitting stationsjA basic sub-band, J ∈ [1, J ]],J and J are positive integers;
a receiving module 702, configured to receive data sent by J transmitting stations simultaneously within a range of N basic sub-bands;
a processing module 703 configured to perform N × K FFT on the received data at a sample sampling rate of N × fsAnd obtaining the data sent by each transmitting station.
Preferably, the scheduling moduleBlock 701 for generating a control signaling comprising M indicating being scheduledjA bitmap of each basic sub-band and sending the control signaling; or
Setting a bit group for indicating basic sub-band scheduling for each transmitting site, wherein each bit corresponds to a basic sub-band; m to be scheduled according to the result of the basic sub-band schedulingjM corresponding to each basic sub-bandjEach bit is set to a first value; and sending the bit group to a corresponding transmitting site through a control signaling.
The embodiment of the invention also provides a data transmission system based on the OFDM. The system can be used for medium-short distance wireless communication, and the available frequency band of the system is equally divided into N basic frequency sub-bands. The system comprises: the transmitting station and the receiving station for receiving data transmitted from the J transmitting stations within the N basic sub-band ranges as described above. If there are multiple transmitting sites in the system, the bandwidths supported by the transmitting sites are different, and on the premise of meeting the bandwidth configuration requirement, the multiple transmitting sites can transmit data to the receiving site by using the respective bandwidth configurations within the bandwidth range supported by the receiving site.
An embodiment of the present invention further provides a device for sending a resource indication, as shown in fig. 8, including:
a scheduling module 801 for scheduling one or more subchannels;
an encapsulating module 802, connected to the scheduling module 801, configured to generate a control signaling according to the scheduled one or more sub-channels, where the control signaling includes a bitmap for indicating the scheduled one or more sub-channels;
a sending module 803, connected to the encapsulating module 802, for sending the control signaling.
The sub-channel may be 1 sub-carrier in a carrier aggregation system, or one sub-channel in a spectrum aggregation system.
The resource indication may be an indication of an uplink resource or a downlink resource.
An embodiment of the present invention further provides a receiving apparatus for resource indication, which is used in cooperation with the resource indicating apparatus, and is configured to receive a resource indication, as shown in fig. 9, where the receiving apparatus includes:
a receiving module 901, configured to receive a control signaling;
an analyzing module 902, connected to the receiving module 901, configured to analyze a bitmap used for indicating a scheduled sub-channel in the control signaling, so as to obtain one or more scheduled sub-channels;
a sending module 903, connected to the parsing module 902, for transmitting information on the scheduled one or more sub-channels.
The sub-channel may be 1 sub-carrier in a carrier aggregation system, or one sub-channel in a spectrum aggregation system.
The resource indication may be an indication of an uplink resource or a downlink resource.
An embodiment of the present invention further provides another apparatus for sending a resource indication, as shown in fig. 10, including:
a scheduling module 1001, configured to set a bit group for indicating subchannel scheduling, where each bit corresponds to a subchannel;
an encapsulating module 1002, connected to the scheduling module 1001, configured to set, according to a result of subchannel scheduling, one or more bits corresponding to one or more scheduled subchannels as a first value;
a sending module 1003, connected to the encapsulating module 1002, configured to send the bit group through a control signaling.
The sub-channel may be 1 sub-carrier in a carrier aggregation system, or may be one sub-channel in a spectrum aggregation system.
The resource indication may be an indication of an uplink resource or a downlink resource.
An embodiment of the present invention further provides a receiving apparatus for resource indication, which is used in cooperation with the another resource indication apparatus, and is configured to receive a resource indication, as shown in fig. 11, where the receiving apparatus includes:
a receiving module 1101, configured to receive a control signaling;
an analyzing module 1102, connected to the receiving module 1101, configured to analyze the control message, and obtain a bit group for indicating sub-channel scheduling, where each bit corresponds to a sub-channel;
a sending module 1103, connected to the parsing module 1102, for knowing that one or more sub-channels corresponding to the one or more bits set as the first value in the bit group are scheduled, and transmitting information on the scheduled one or more sub-channels.
The sub-channel may be 1 sub-carrier in a carrier aggregation system, or may be one sub-channel in a spectrum aggregation system.
The resource indication may be an indication of an uplink resource or a downlink resource.
In summary, the technical solution provided in the present invention, based on the OFDM technology and the combined use of sub-bands, allows the transmitting station STA and the receiving station CAP in the wireless communication system to have different bandwidth configurations, the transmitting station STA can adopt a lower configuration to reduce the hardware implementation cost, and the receiving station CAP can adopt a higher configuration to improve the efficiency: spectrum utilization rate, throughput rate, etc., and can realize that a plurality of STAs communicate with the CAP at the same time. In addition, a guard band, namely a virtual carrier, is added at the edge of the sub-band, so that the interference between the sub-bands can be avoided, each sub-band can be independently made into filtering, and a receiving end only needs to perform matched filtering on the whole frequency band, so that a plurality of baseband receivers do not need to perform matched filtering aiming at different sub-bands, the Cyclic Prefix (CP) is expanded, and the requirement of time synchronization is lowered. The sampling rate of the baseband samples of the receiving end is N times of the sampling rate of the basic sub-band samples, so that the basic sub-band only needs an IFFT/FFT module with N1 points, and the receiving end uses the IFFT/FFT module with N2N 1 points instead of a plurality of parallel IFFT/FFT modules with N1 points to demodulate the information of each sub-band. Therefore, the system throughput rate of the frequency spectrum utilization rate can be improved, a plurality of STAs can communicate with the CAP at the same time, and the cost of the system and the cost of user station equipment do not need to be increased.
The disclosed embodiments are provided to enable those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the scope or spirit of the invention. The above-described embodiments are merely preferred embodiments of the present invention, which should not be construed as limiting the invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A data transmission method based on OFDM, wherein J is a positive integer, and is used for J transmitting stations to transmit data to one receiving station simultaneously, the method comprising:
the receiving station divides the available frequency band into N basic frequency sub-bands, and schedules respective exclusive M for J transmitting stationsjA basic sub-band, J ∈ [1, J ]],j is a positive integer;
j pieces of hairThe transmitting stations respectively carry out IFFT processing on OFDM data to be transmitted, wherein the jth transmitting station carries out IFFT processing on the data with the length of MjIFFT processing of XK points with a sample sampling rate of Mj×fs；
J transmitting stations respectively modulate the data after IFFT processing, wherein the jth transmitting station modulates the data to MjA plurality of basic frequency sub-bands;
j transmitting sites respectively in respective exclusive MjTransmitting data on a plurality of fundamental sub-bands;
the receiving station receives the data sent by J transmitting stations in the range of N basic sub-bands at the same time, and performs FFT processing of N multiplied by K points, and the sampling rate of the adopted samples is N multiplied by fs；
Wherein f issRepresenting the input sample sampling rate of the IFFT/FFT for one fundamental sub-band.
2. The method of claim 1, wherein:
the receiving station generates a control signaling, wherein the control signaling comprises a bitmap for indicating the J scheduled basic sub-bands; sending the control signaling;
each transmitting station analyzes the bitmap for indicating the scheduled basic frequency sub-band by receiving the control signaling, and knows the scheduled MjA basic sub-band.
3. The method of claim 1, wherein:
the receiving site sets a bit group for indicating basic sub-band scheduling for each transmitting site, wherein each bit corresponds to a basic sub-band; m to be scheduled according to the result of the basic sub-band schedulingjSetting M bits corresponding to the basic frequency sub-bands as a first value; sending the bit group to a corresponding transmitting station through a control signaling;
the transmitting station receives the control signaling to obtain a bit group for indicating the basic sub-band scheduling, wherein each bit corresponds to a baseThe sub-band; according to M set as a first value in the bit groupjEach bit knows that the corresponding M basic subbands are scheduled.
4. The method of claim 1, wherein:
said jth transmitting station modulating data to said MjOn each basic frequency sub-band, independently transmitting on each basic frequency sub-band; or,
modulating data to the MjTransmitting on a combined frequency band of the plurality of elementary sub-bands on said combined frequency band; wherein, M isjThe elementary subbands are contiguous elementary subbands.
5. A receiving station, comprising:
a scheduling module for dividing the available frequency band into N basic sub-bands and scheduling respective exclusive M for J transmitting sitesjA basic sub-band, J ∈ [1, J ]],J and J are positive integers;
the receiving module is used for simultaneously receiving data sent by J transmitting sites in the range of the N basic sub-frequency bands;
a processing module for performing N × K point FFT processing on the received data at a sample sampling rate of N × fsObtaining data sent by each transmitting station;
wherein f issRepresenting the input sample sampling rate of the FFT for one fundamental sub-band.
6. A receiving station as claimed in claim 5, characterised in that:
the scheduling module is used for generating a control signaling which comprises a bitmap used for indicating the J scheduled basic sub-bands and sending the control signaling; or
Setting basic sub-frequency for each transmitting stationA bit group with scheduling, wherein each bit corresponds to a basic sub-band; m to be scheduled according to the result of the basic sub-band schedulingjSetting M bits corresponding to the basic frequency sub-bands as a first value; and sending the bit group to a corresponding transmitting site through a control signaling.
7. A transmitting station, comprising:
a receiving module for obtaining M scheduled by the receiving stationjInformation indicating a basic sub-band, J ∈ [1, J ∈ [ ]],J and J are positive integers; n is the number of basic sub-bands contained in the available frequency band of the system;
a processing module for processing the OFDM data to be transmitted with the length of MjIFFT processing of XK points with a sample sampling rate of Mj×fs；
A modulation module for modulating the IFFT processed data to MjA plurality of basic frequency sub-bands;
a transmitting module for transmitting the signal at MjTransmitting data on a plurality of fundamental sub-bands;
wherein f issRepresenting the input sample sampling rate of the IFFT for one fundamental sub-band.
8. The transmitting station of claim 7, wherein:
the receiving module analyzes the bitmap for indicating the scheduled basic sub-band by receiving a control signaling, and obtains the scheduled MjA plurality of elementary sub-bands; or,
obtaining a bit group for indicating basic subband scheduling by receiving a control signaling, wherein each bit corresponds to a basic subband; according to M set as a first value in the bit groupjEach bit knows that the corresponding M basic subbands are scheduled.
9. The transmitting station of claim 7, wherein:
the transmitting module is used for modulating data to the MjOn each basic frequency sub-band, independently transmitting on each basic frequency sub-band; or,
modulating data to the MjTransmitting on a combined frequency band of the plurality of elementary sub-bands on said combined frequency band; wherein, M isjThe elementary subbands are contiguous elementary subbands.
10. The transmitting station of claim 9, wherein:
the transmitting module is also used for setting virtual subcarriers at two ends of each sub-frequency band; or,
virtual subcarriers are provided at both ends of the combined frequency band.
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