CN101282258A - Evolvement system being compatible with variable frequency range Wimax system, frame as well as generating method thereof - Google Patents
Evolvement system being compatible with variable frequency range Wimax system, frame as well as generating method thereof Download PDFInfo
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Abstract
An evolution system, frame compatible with diverse frequency range Wimax systems and a production method thereof are disclosed, sub-carrier wave and circulation prefix of the compatible Wimax system are the same as each other, number N of the evolution system IFFT is determined to be larger than or equal to sum of numbers of IFFTs corresponding to each compatible Wimax system; in accordance with the number and spacing of the sub-carrier wave of the Wimax system, transmission rate of the evolution system is obtained; data points of the signal are transmitted according to the transmission rate as well as coded and modulated; the data points carrying information of diverse frequency range Wimax systems are arrayed at diverse positions of N point IFFT in terms of each system frequency range, these position are not mutually superposed; the arrayed N data points is performed IFFT operation of N point at each time so as to transform to OFDM time frequency symbols, and the circulation prefix having the length same as the Wimax system is added to the OFDM symbols which is then transmitted; a plurality of symbols combine into a frame. The invention enables the terminals of diverse frequency range Wimax systems to be accessible to the evolution system.
Description
Technical field
The present invention relates to digital communicating field, particularly relate to a kind of generation method of new system, frame and frame that can compatible different frequency range Wimax (micro-wave access global inter communication) system.
Background technology
As a kind of multi-carrier transmission pattern, OFDM (OFDM:Orthogonal FrequencyDivision Multiplexing) is converted to one group of low-speed parallel data flow transmitted by the data flow with a high-speed transfer, system is reduced greatly to the susceptibility of multidiameter fading channel frequency selectivity, and the introducing of Cyclic Prefix, further strengthened the ability of the anti-intersymbol interference of system again, bandwidth availability ratio height in addition, realized that characteristics such as simple make OFDM more and more wider in the application of wireless communication field.
Wimax is a kind of wireless access wide band technology based on the OFDM technology, in recent years, because its application mode flexibly, higher spectrum efficiency and more and more being subject to people's attention.At present, the bandwidth commonly used of Wimax system has 5MHz, and 10MHz and 20MHz etc. are multiple.
For the Wimax system, the terminal of different frequency range Wimax can only be linked in the system of its corresponding bandwidth, and this restriction has greatly restricted the development of Wimax.On the other hand, along with the fusion of following wireless communication technology, unified system of broadband wireless communication will occur, and how the Wimax system of different frequency range being smoothly transitted in the unified broadband wireless system also is a problem that merits attention.
Summary of the invention
The technical problem to be solved in the present invention provides the frame generating method of the evolution system of a kind of compatible different frequency range Wimax system, makes the Wimax system terminal of different frequency range can be linked in this evolution system.
In order to solve the problems of the technologies described above, the invention provides the frame generating method of the evolution system of a kind of compatible different frequency range Wimax system, the subcarrier spacing of compatible Wimax system identical with Cyclic Prefix, may further comprise the steps:
(a) determine the points N of evolution system invert fast fourier transformation IFFT, should be more than or equal to the corresponding IFFT of each Wimax system of compatibility sum of counting, count and the subcarrier spacing of Wimax system according to this, obtain the transmission rate of evolution system;
(b) data point that transmits by the transmission rate transmission of determining is carried out coded modulation to it;
(c) data point that will carry different frequency range Wimax system information is arranged in the diverse location of N point IFFT, these position non-overlappings by system's frequency range separately;
(d) N data point after the ordering carried out the IFFT computing that N is ordered at every turn, be converted to the OFDM time-domain symbol, and add the Cyclic Prefix identical with the Wimax system length before the OFDM symbol, launch then, a plurality of OFDM symbols are formed a frame.
Above-mentioned frame generating method also can have following characteristics:
In each frame, the beared information in each OFDM symbol on each original frequency range of Wimax system carries out information-bearing according to the framing rule of this bandwidth Wimax system.
Above-mentioned frame generating method also can have following characteristics:
Different frequency range Wimax system is fixed in a frame position in IFFT at least.
The another technical problem that the present invention will solve provides the evolution system of a kind of compatible different frequency range Wimax system, comprises transceiver, makes the Wimax system terminal of different frequency range can be linked in this system.
In order to solve the problems of the technologies described above, the invention provides and comprise transceiver, this transceiver comprises handles coded modulation unit, sequencing unit, invert fast fourier transformation IFFT unit, Cyclic Prefix adding device and transmitter unit successively to signal, it is characterized in that:
The coded modulation unit is used for encoding by the data point that transmits of the evolution system transmission rate transmission of determining, modulation, this transmission rate is determined by the points N of evolution system IFFT and the subcarrier spacing of Wimax system, N is more than or equal to the IFFT of each Wimax system correspondence of the compatibility sum of counting, the subcarrier spacing of compatible different frequency range Wimax system identical;
The data point that described sequencing unit is used for carrying compatible each Wimax system information is arranged in the diverse location of N point IFFT, these position non-overlappings by system's frequency range separately;
Described Cyclic Prefix adding device is used for adding the cyclic prefix CP identical with the Wimax system length before the OFDM symbol, the Cyclic Prefix of compatible different frequency range Wimax system identical.
Further, above-mentioned transceiver also can have following characteristics:
When described sequencing unit was the data point ordering, the position of the data point of different frequency range Wimax system was fixed in a frame at least.
Further, above-mentioned transceiver also can have following characteristics:
Described transceiver is in each frame, and the beared information in each OFDM symbol on each original frequency range of Wimax system carries out information-bearing according to the framing rule of this bandwidth Wimax system.
Another technical problem that the present invention will solve provides the frame of the evolution system of a kind of compatible different frequency range Wimax system, can satisfy the access requirement of the Wimax system terminal of different frequency range.
In order to solve the problems of the technologies described above, the invention provides the frame of the evolution system of a kind of compatible different frequency range Wimax system, comprise a descending sub frame and a sub-frame of uplink, be provided with a transfer point between the subframe, each subframe comprises several OFDM symbols, have Cyclic Prefix before each OFDM symbol, it is characterized in that:
The bandwidth of this evolution system is more than or equal to compatible Wimax system bandwidth sum, and frequency range covered the frequency range of compatible Wimax system;
The subcarrier spacing of this evolution system with the subcarrier spacing of compatible each Wimax system identical, and described Cyclic Prefix with the circulating prefix-length of each Wimax system of compatibility identical;
In compatible each Wimax system of institute original frequency range position, comprised the descending sub frame structure and the sub-frame of uplink structure of corresponding Wimax system-frame in the descending sub frame of described evolution system frame and the sub-frame of uplink respectively.
Further, above-mentioned frame also can have following characteristics: the frame length of described evolution system frame is 5ms.
Further, above-mentioned frame also can have following characteristics: the relation that has integral multiple between the bandwidth of the Wimax system of described compatible different frequency range.
Further, above-mentioned frame also can have following characteristics: the descending sub frame of the Wimax system-frame of different frequency range and the zero-time of sub-frame of uplink, termination time alignment or differ the integral multiple of OFDM symbol and circulating prefix-length sum.
Further, above-mentioned frame also can have following characteristics: the descending sub frame of described evolution system frame and the Wimax system-frame that is comprised and zero-time, the termination time of sub-frame of uplink align or differ the integral multiple of OFDM symbol and circulating prefix-length sum.
Further, above-mentioned frame also can have following characteristics: be provided with the control information of Wimax in the exclusive frequency range of described evolution system frame, the leading Preamble that comprises Wimax, frame control head FCH, downlink channel is described DCD, and uplink channel is described one or more among UCD and the mapping MAP.
As from the foregoing, the present invention does not need to carry out the modification of any software or hardware to the Wimax terminal of various bandwidth, just can be the Wimax network smooth evolution of various bandwidth to same network.Advantage of the present invention is that the Wimax system of various bandwidth can be inserted in the system simultaneously, realizes backward compatibility, thereby can carry out centralized dispatching and management to the Wimax system of various bandwidth, improves the availability of frequency spectrum.In addition, the more smooth evolution of high bandwidth system communication such as also can realize from Wimax to 4G.Further, also can allow the terminal of system after the evolution use the resource of Wimax system, promptly realize forward compatibility.
Description of drawings
Fig. 1 is the generative process schematic diagram of the OFDM symbol of a compatible different frequency range Wimax of the embodiment of the invention;
Fig. 2 is the functional unit schematic diagram of embodiment of the invention evolution system transceiver;
Fig. 3 is the structural representation in the embodiment of the invention frame.
Embodiment
The Wimax system of a plurality of different frequency ranges of the present invention can use the various bandwidth of Wimax definition, but the Wimax of different frequency range should use same group bandwidth, promptly have the relation of integral multiple between two bandwidth, and CP length should be consistent.Insert same evolution system, the bandwidth of this evolution system is more than or equal to compatible Wimax system bandwidth sum, frequency range need cover the frequency range of these Wimax systems, on the structure of frame, also need to continue the essential characteristic of some Wimax system-frame, the same with the Wimax system, the present invention adopts the technology based on OFDM when modulation.
Can be with reference to frame structure shown in Figure 3, the frame length of a frame is 5ms (being not limited to this), and bandwidth is 44.8MHz, comprises a plurality of subcarriers that equate at interval, and it is that 5MHz and bandwidth are the frequency range of two Wimax systems of 10MHz that its frequency range has covered bandwidth.As shown in the figure, comprise a descending sub frame and a sub-frame of uplink in the frame, be provided with a transfer point between each subframe, the transfer point between descending sub frame and the sub-frame of uplink can be adjusted.All comprise several OFDM symbols in each descending sub frame and the sub-frame of uplink, all have CP (Cyclic Prefix, Cyclic Prefix) before each OFDM symbol.For fear of between the Wimax of different frequency range system, and the interference between Wimax system and the evolution system, the subcarrier spacing of whole system is identical with the Wimax system, and the length of the CP that has before each OFDM symbol also equals the CP length of all Wimax systems.
There is shown the residing in time position of Wimax symbol of carrying 5MHz bandwidth and 10MHz bandwidth.In this embodiment, descending first OFDM symbol aligned of 5MHz bandwidth and 10MHz bandwidth Wimax, and and the alignment of the frame head of entire frame structure, in fact can not line up between this three, can differ the length sum of an integer OFDM symbol and CP, descending last the OFDM symbol of 5MHz bandwidth and 10MHz bandwidth Wimax can align, and also can not line up, but must also differ the length sum of an integer OFDM symbol and CP.Also similar to sub-frame of uplink.Be can align zero-time, termination time of the descending sub frame of Wimax system of different frequency range and sub-frame of uplink also can not line up.The zero-time of the sub-frame of uplink zero-time of Wimax system and evolution system and termination time, descending sub frame and termination time can be alignd and also can not lined up.
In addition, in this example, the frequency range of two Wimax systems lays respectively at the upper and lower and the boundary alignment of evolution system frequency range, but not and be confined to this, can not be positioned at any position, the bandwidth non-overlapping copies of different Wimax system.
In each Wimax system original frequency range position, comprised the descending sub frame structure of corresponding Wimax system-frame in the descending sub frame of evolution system frame, comprised the sub-frame of uplink structure of corresponding Wimax system-frame in the sub-frame of uplink of evolution system frame.As shown in Figure 3, provided in these structures the Wimax system some control signalings of essential carrying, as Preamble, FCH, that stipulates among the MAP etc., these control signalings and Wimax is the same, the relevant position that is carried on original frequency range gets final product.
The bandwidth that does not belong to the Wimax system can be distributed to any system based on OFDM, and the present invention does not make concrete regulation to other regional message structure of frame.This does not influence the access of Wimax system terminal, does not promptly influence the realization of backward compatibility.
Introduce the launching technique of present embodiment evolution system frame below, may further comprise the steps:
Step 110 is determined the points N of invert fast fourier transformation IFFT, and N should be more than or equal to the corresponding IFFT of each Wimax system of compatibility sum of counting, and multiply by the subcarrier spacing of Wimax system with N, obtains the transmission rate of evolution system;
In an embodiment, the compatible Wimax bandwidth of has two kinds, and a kind of is 5MHz, and a kind of is 10MHz.The Wimax system of 5MHz correspondence wherein, it is 512 points that its IFFT counts; It is 1024 points that the Wimax system of 10MHz correspondence, its IFFT count.Therefore the IFFT of evolution system counts and is decided to be 4096 points.The subcarrier spacing of the Wimax system of 5MHz and 10MHz bandwidth is 10.9375kHz, and then the sample frequency of evolution system is 10.9375kHz*4096=44.8MHz.The sample frequency of the Wimax system of various bandwidth is the same with corresponding former Wimax with its corresponding transmission rate.
Below be the operation that the evolution system transceiver carries out:
Step 120 by the data point that the transmission rate transmission of determining transmits, is encoded, is modulated it, adopts the technology based on OFDM during modulation;
In an embodiment, obtain 4096 data points on the frequency domain altogether, wherein the data point corresponding to the 5MHz bandwidth has 512 points, corresponding to the data point of 10MHz bandwidth 1024 points is arranged.
Step 130 sorts to data point, and the data point of carrying different frequency range Wimax system information is arranged in the diverse location of N point IFFT by system's frequency range separately, these position non-overlappings and fixing in a frame at least;
So just can realize the information-bearing of different frequency range Wimax system on different frequencies.If contain the Wimax of certain bandwidth in this OFDM symbol, then the frequency location in the Wimax of this bandwidth each OFDM symbol in frame is constant, realizes that also the Wimax of different frequency range is not overlapping on frequency simultaneously.
As shown in Figure 1, in a frame, 512 of 5MHz bandwidth Wimax system are carried on preoperative 4098 the 1st o'clock to the 512nd of IFFT, and 1024 of 10MHz bandwidth Wimax system are carried on preoperative 4098 the 3075th o'clock to the 4098th of IFFT.Certainly be not limited thereto, also can be on other aspects, as long as guarantee the invariant position of each frequency range correspondence in each OFDM symbol.
Step 140, N data point after the ordering carried out the IFFT computing that N is ordered at every turn, be converted to the OFDM time-domain symbol, and add that before symbol (as hypothesis CP length is 1/8 of an OFDM symbol lengths to the CP identical with Wimax length, certainly be not limited thereto), launch then, a plurality of OFDM symbols are formed a frame;
Step 150, in a frame, the beared information of each Wimax system carries out information-bearing according to the framing rule of this bandwidth Wimax in each OFDM symbol.
By above step, just can be used to produce the OFDM symbol that meets the evolution system frame structure, carried the Wimax information of 5MHz and these two kinds of bandwidth of 10MHz on this symbol.
As shown in Figure 2, the evolution system of above-mentioned compatible different frequency range Wimax system comprises that transceiver comprises coded modulation unit, sequencing unit, IFFT unit, Cyclic Prefix adding device and transmitter unit.Wherein:
The coded modulation unit is used for encoding by the data point that transmits of the evolution system transmission rate transmission of determining, modulation outputs to sequencing unit;
The data point that sequencing unit is used for carrying different frequency range Wimax system information is arranged in the diverse location of N point IFFT by system's frequency range separately, and these position non-overlappings and fixing in a frame at least output to the IFFT unit then;
The IFFT unit is used for N data point after the ordering being carried out the IFFT computing that N is ordered at every turn, is converted to the OFDM time-domain symbol, outputs to the Cyclic Prefix adding device;
The Cyclic Prefix adding device is used for adding the CP identical with the Wimax system length before the OFDM symbol, outputs to transmitter unit;
Transmitter unit is used for the OFDM symbol of the described CP of having is launched by eating dishes without rice or wine.
In order to realize forward compatibility, the terminal of evolution system can be inserted in Wimax system frequency range, be divided into following several situation:
1) terminal of this evolution system control information of directly reading Wimax in the Wimax system descending subframe from the original frequency range of Wimax system, the Preamble (leading) that comprises Wimax, FCH (Frame Control Head, frame control head), DCD (Downlink Channel Descriptor, downlink channel is described), UCD (Uplink Channel Descriptor, uplink channel is described), MAP control informations such as (mappings), thus in Wimax system frequency range, insert and use resource on the original frequency range of Wimax system.
2) control information of Wimax is set in the exclusive frequency range of evolution system, the terminal of this evolution system can be obtained Wimax in non-Wimax bandwidth control information, thus in Wimax system frequency range, insert and use resource on the original frequency range of Wimax system.
3) the part control information of Wimax is set in the exclusive frequency range of evolution system, the terminal of this evolution system reads the part control information of Wimax in the exclusive frequency range of evolution system, all the other information read from the Wimax system descending subframe of the original frequency range of Wimax system, thereby insert and use the resource on the original frequency range of Wimax system in Wimax system frequency range.
Advantage of the present invention is that the Wimax system of various bandwidth can be inserted in the system simultaneously, thereby can carry out centralized dispatching and management to the Wimax system of various bandwidth, improves the availability of frequency spectrum.In addition, the more smooth evolution of high bandwidth system communication such as also can realize from Wimax to 4G.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (12)
1. the frame generating method of the evolution system of a compatible different frequency range Wimax system, the subcarrier spacing of compatible Wimax system identical with Cyclic Prefix, may further comprise the steps:
(a) determine the points N of evolution system invert fast fourier transformation IFFT, should be more than or equal to the corresponding IFFT of each Wimax system of compatibility sum of counting, count and the subcarrier spacing of Wimax system according to this, obtain the transmission rate of evolution system;
(b) data point that transmits by the transmission rate transmission of determining is carried out coded modulation to it;
(c) data point that will carry different frequency range Wimax system information is arranged in the diverse location of N point IFFT, these position non-overlappings by system's frequency range separately;
(d) N data point after the ordering carried out the IFFT computing that N is ordered at every turn, be converted to the OFDM time-domain symbol, and add the Cyclic Prefix identical with the Wimax system length before the OFDM symbol, launch then, a plurality of OFDM symbols are formed a frame.
2. frame generating method as claimed in claim 1 is characterized in that:
In each frame, the beared information in each OFDM symbol on each original frequency range of Wimax system carries out information-bearing according to the framing rule of this bandwidth Wimax system.
3. frame generating method as claimed in claim 1 is characterized in that:
Different frequency range Wimax system is fixed in a frame position in IFFT at least.
4. the frame of the evolution system of a compatible different frequency range Wimax system, comprise a descending sub frame and a sub-frame of uplink, be provided with a transfer point between the subframe, each subframe comprises several OFDM symbols, have Cyclic Prefix before each OFDM symbol, it is characterized in that:
The bandwidth of this evolution system is more than or equal to compatible Wimax system bandwidth sum, and frequency range covered the frequency range of compatible Wimax system;
The subcarrier spacing of this evolution system with the subcarrier spacing of compatible each Wimax system identical, and described Cyclic Prefix with the circulating prefix-length of each Wimax system of compatibility identical;
In compatible each Wimax system of institute original frequency range position, comprised the descending sub frame structure and the sub-frame of uplink structure of corresponding Wimax system-frame in the descending sub frame of described evolution system frame and the sub-frame of uplink respectively.
5. frame as claimed in claim 4 is characterized in that:
The frame length of described evolution system frame is 5ms.
6. frame as claimed in claim 4 is characterized in that:
The relation that has integral multiple between the bandwidth of the Wimax system of described compatible different frequency range.
7. frame as claimed in claim 4 is characterized in that:
The descending sub frame of the Wimax system-frame of different frequency range and the zero-time of sub-frame of uplink, termination time alignment or differ the integral multiple of OFDM symbol and circulating prefix-length sum.
8. frame as claimed in claim 4 is characterized in that:
The descending sub frame of described evolution system frame and the Wimax system-frame that is comprised and zero-time, the termination time of sub-frame of uplink align or differ the integral multiple of OFDM symbol and circulating prefix-length sum.
9. frame as claimed in claim 4 is characterized in that:
Be provided with the control information of Wimax in the exclusive frequency range of described evolution system frame, comprise the leading Preamble of Wimax, frame control head FCH, downlink channel is described DCD, and uplink channel is described one or more among UCD and the mapping MAP.
10. the evolution system of a compatible different frequency range Wimax system, comprise transceiver, this transceiver comprises handles coded modulation unit, sequencing unit, invert fast fourier transformation IFFT unit, Cyclic Prefix adding device and transmitter unit successively to signal, it is characterized in that:
The coded modulation unit is used for encoding by the data point that transmits of the evolution system transmission rate transmission of determining, modulation, this transmission rate is determined by the points N of evolution system IFFT and the subcarrier spacing of Wimax system, N is more than or equal to the IFFT of each Wimax system correspondence of the compatibility sum of counting, the subcarrier spacing of compatible different frequency range Wimax system identical;
The data point that described sequencing unit is used for carrying compatible each Wimax system information is arranged in the diverse location of N point IFFT, these position non-overlappings by system's frequency range separately;
Described Cyclic Prefix adding device is used for adding the cyclic prefix CP identical with the Wimax system length before the OFDM symbol, the Cyclic Prefix of compatible different frequency range Wimax system identical.
11. transceiver as claimed in claim 10 is characterized in that:
When described sequencing unit was the data point ordering, the position of the data point of different frequency range Wimax system was fixed in a frame at least.
12. transceiver as claimed in claim 1 is characterized in that:
Described transceiver is in a frame, and the beared information in each OFDM symbol on each original frequency range of Wimax system carries out information-bearing according to the framing rule of this bandwidth Wimax system.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101795154B (en) * | 2009-01-13 | 2013-06-19 | 英特尔移动通信有限责任公司 | Method and device for transferring data |
| CN107395543A (en) * | 2009-11-03 | 2017-11-24 | 英特尔公司 | For supporting the frame structure of big delay extension deployment scenario |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1527512A (en) * | 2003-03-06 | 2004-09-08 | 北京三星通信技术研究有限公司 | Training sign generating and transmitting method in orthogonal frequency-division multiplexing system |
| US8201240B2 (en) * | 2005-09-16 | 2012-06-12 | Nokia Corporation | Simple scalable and configurable secure boot for trusted mobile phones |
| CN100576835C (en) * | 2005-12-12 | 2009-12-30 | 北京北方烽火科技有限公司 | A kind of combined time synchronization method that is used for WiMAX system base-station receiving terminal |
| CN101282261B (en) * | 2007-04-03 | 2011-10-26 | 中兴通讯股份有限公司 | Evolvement system being compatible with variable bandwidth Wimax system, wireless frame as well as generating method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101795154B (en) * | 2009-01-13 | 2013-06-19 | 英特尔移动通信有限责任公司 | Method and device for transferring data |
| CN107395543A (en) * | 2009-11-03 | 2017-11-24 | 英特尔公司 | For supporting the frame structure of big delay extension deployment scenario |
| CN107395543B (en) * | 2009-11-03 | 2021-09-07 | 苹果公司 | Method and base station for supporting frame structure of large delay spread deployment case |
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