CN1521968A - Generation method and transmission method for new training signal in orthogonal frequency division multiplexing system - Google Patents
Generation method and transmission method for new training signal in orthogonal frequency division multiplexing system Download PDFInfo
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Abstract
A method for producing new training symbols in orthogonal frequency division multiplexing system, the orthogonal frequency division multiplexing communication system has N sub-carriers, wherein L of them are being used, each transmission frame arrangement includes downlink sub-frames and uplink sub-frames, the leading portions of the downlink sub-frames are switch-in leaders for producing a new training symbol in base station, the training symbol is transmitted in downlink sub-frames, its position is controlled by the downlink control information. The training symbol maps the known position from No. n to No. M uplink sub-frame starting from the present frame on as the random switch-in time slot.
Description
Technical field
The present invention relates to OFDM (OFDM) communication technology, particularly the transmission method of the production method of new training symbol and this training symbol in the ofdm system.
Background technology
In a lot of ofdm communication systems, for example IEEE802.16a and high-performance metropolitan area network standard (Hiperman), all adaptive antenna (AAS) but technology obtains system gain as a selecting technology.In such system, when the AAS technology is adopted in the base station (hereinafter to be referred as the AAS base station, corresponding system claims the AAS system), the sub-district of this base station services can be supported to adopt the terminal (hereinafter to be referred as the AAS terminal) of AAS technology simultaneously and do not adopted the terminal (hereinafter to be referred as non-AAS terminal) of AAS technology.But when the AAS technology is not adopted in the base station (hereinafter to be referred as non-AAS base station, corresponding system claims non-AAS system), non-AAS terminal can only be supported in the sub-district of this base station services.In the sub-district of non-AAS base station services, non-AAS starting up of terminal or when restarting can be intercepted descending (from the base station to the terminal, as follows) channel, determines the beginning of downlink frame by specific training sequence, again by the beginning of the frame downlink broadcast information of decoding.Know the random access time slot of up (, as follows) subframe from terminal to base station by the mapping relations of some specific downlink broadcast information.When a certain non-AAS terminal was thought initial connecting system, this terminal can be come connecting system by certain competition access mechanism at these random access time slots by the broadcast message mapping.In the sub-district of AAS base station services, non-AAS terminal inserts the process of AAS system and the process of the non-AAS of access system is the same.Concerning the AAS terminal, if the energy of the downstream signal that this AAS terminal receives is high enough to the downlink broadcast information of can decoding, to insert the process that the AAS systematic procedure can insert the AAS system with non-AAS terminal be the same for this AAS terminal so.In the sub-district of AAS base station services, because the sub-district covers and antenna beam moulding or other reasons, have some such AAS terminals sometimes, these terminals are before connecting system, because the not high enough so that downlink broadcast information of can not decoding of energy of the downstream signal that receives.But because specific training sequence is the form cause base station by power ascension, these terminals can be caught the beginning that specific training sequence is known frame.Such terminal just only knows the beginning of frame but can not separate broadcast message, thereby do not know the random access time slot by the broadcast message mapping.In order to allow these terminals can insert the AAS system, in up channel, use some time slots, arrange in advance the position of these time slots, and the beginning of frame is known relatively, does not need broadcast message to shine upon.We claim that these known time slots are AAS alarm time slot.When this part terminal is wanted connecting system, show that to the alarm signal of AAS base station this terminal is the AAS terminal by certain competition access mechanism at AAS alarm time slot.Simultaneously, the AAS base station by measure wherein transmit adjust to the beam forming of terminal and to the proprietary map information of this terminal emission make this terminal can with the AAS base station communication.In the AAS system of present IEEE802.16a 256 OFDM patterns and lining, high-performance metropolitan area network planning (Hiperman), last L the OFDM symbol that defines each FDD sub-frame of uplink is as AAS alarm time slot, and last L the OFDM symbol that defines each TDD sub-frame of uplink is as AAS alarm time slot.Though definition AAS alarm time slot mainly is at the AAS terminal of those downlink broadcast information of can not decoding when the initial condition, also can do initial access to any AAS terminal.That is to say that when initial condition any AAS terminal downlink broadcast information that can not need to decode is directly come connecting system by AAS alarm time slot.
AAS system definition AAS alarm time slot does initial access for the AAS terminal, does initial access especially for those the AAS terminals that can not decode downlink broadcast information when initial condition.This AAS alarm time slot all can exist at each FDD or TDD sub-frame of uplink.Because the AAS system will support non-AAS terminal and AAS terminal simultaneously, when not having AAS terminal or AAS terminal fewer in the AAS system, the AAS alarm time slot that every frame all exists will become extra expense.Simultaneously, insert non-AAS system, and this AAS terminal is can not decode downlink broadcast information the time when initial condition in the AAS terminal.This terminal does not also know whether current system is the AAS system, it can suppose that there is AAS alarm time slot in this system, determine that according to the position of the training sequence that captures supposition exists but the position of actual non-existent AAS alarm time slot, and launch alarm signal at the AAS alarm time slot that this supposition exists.In fact have the upward signal (from the signal of terminal to base station) of other non-AAS terminal in the AAS alarm time slot that this supposition exists, alarm signal will become a serious disturbance signal like this.
Summary of the invention
The purpose of this invention is to provide a kind of down channel in the AAS system introduces a new training symbol to indicate this system is the AAS system, the training sequence of the similar frame of this training symbol beginning but be different from this training sequence can guarantee anyly can capture the AAS terminal that frame starts training sequence and can capture this beacon signal like this.
For achieving the above object, the production method of new training symbol in a kind of ofdm system, described orthogonal FDM communication system has N subcarrier, use therein subcarrier is L, every transmission frame-form comprises descending sub frame and sub-frame of uplink, the beginning of descending sub frame is an access lead, and described method comprises step:
In the base station, produce a kind of new training symbol;
Described training symbol transmits in descending sub frame, and described training symbol is controlled by Downlink Control Information at the transmission location of descending sub frame;
Described training symbol maps from present frame backward the n of number be random access time slot to the known location of m sub-frame of uplink.
The present invention can avoid the interference of AAS terminal to non-AAS system, indicates whether current system is the AAS system owing to introduced the AAS indicating device for the AAS system.The AAS terminal only captures the AAS indicating device could come connecting system by AAS alarm time slot.Because non-AAS system does not have the AAS indicating device, the AAS terminal is come connecting system by AAS alarm time slot never in non-AAS system so, has so just avoided interference.Owing to introduce the AAS indicating device, and AAS indicating device and AAS alarm time slot bundle, and so just there is no need all to place AAS alarm time slot at each sub-frame of uplink, so just might reduce the extra expense of bringing owing to AAS alarm time slot.AAS indicating device and its corresponding transmission method that the present invention describes are realized extremely easily, particularly to EEE802.16a and the current standard of high-performance metropolitan area network standard (Hiperman), only need very little change.
Description of drawings
Fig. 1 is the tdd frame structure in conjunction with the AAS indicating device, and wherein the AAS indicating device transmits by hinting obliquely at descending sub frame of a new DL-MAP unit, and FCH is a frame control head.
Fig. 2 is the frame structure example of time division duplex (TDD) system, comprises descending sub frame, sub-frame of uplink, and a transmit receive separation and a receipts are at interval.
Fig. 3 is the frame structure example of Frequency Division Duplexing (FDD) (FDD) system, comprises descending sub frame and sub-frame of uplink.
Fig. 4 is a downstream data traffic, is made up of the downlink business segmentation.
Fig. 5 is a uplink service, is made up of the uplink service segmentation.
Fig. 6 is when not having the AAS indicating device, the flow graph of terminal connecting system.
Fig. 7 is an AAS indicator structure one, and wherein Tg represents the length of Cyclic Prefix, and Tb represents the length of an OFDM data symbol, the symbol of AI and the opposite in sign of A.
Fig. 8 is an AAS indicator structure two, and wherein Tg represents the length of Cyclic Prefix, and Tb represents the length of an OFDM data symbol, the symbol of AI and the opposite in sign of A.The symbol of BI and the opposite in sign of B.
Fig. 9 is the AAS terminal inserts the AAS system by the AAS indicating device a flow graph.
Embodiment
In a lot of ofdm systems, for example IEEE802.16a and high-performance metropolitan area network standard (Hiperman) have all comprised the communication mode of time division duplex (TDD) and Frequency Division Duplexing (FDD) (FDD).With respect to this dual mode two kinds of different transmission frame-forms are arranged, example as these two kinds of frame structures is distinguished as shown in Figures 2 and 3, in these two kinds of frame structures, each frame has all comprised descending sub frame and sub-frame of uplink, and wherein TDD also comprises the transmitting-receiving gap and sends out and receive the gap.The beginning of descending sub frame is long access lead, and this long access lead is a kind of specific training sequence, is used to determine the beginning of each frame.Followed by long access lead be frame control head information, this information is some control informations, is used for illustrating current frame length, type of service, current channel quality etc.Simultaneously, frame control head has also comprised descending map information (DL-MAP) and up map information (UL-MAP), and wherein DL-MAP shines upon the data service segmentation situation of current descending sub frame, comprises the position, the user of use etc.; UL-MAP shines upon the data service segmentation situation of current sub-frame of uplink or next sub-frame of uplink, comprises the position, the user of use etc., the information that while UL-MAP also shines upon random access time slot and bandwidth request time slot.Fig. 4 and Fig. 5 are respectively the illustrations of downstream data traffic and uplink service.Concerning the AAS system, some known position of sub-frame of uplink is defined as a known traffic segment in advance, be AAS alarm time slot, corresponding to 802.16 256 OFDM (P802.16a/D7-2003.1) system pattern and HipermanOFDM pattern (BRAN031d89-2002.12 BRAN031d88-2002.12), AAS alarm time slot is a last L OFDM symbol of current sub-frame of uplink.
DL-MAP unit and UL-MAP unit shine upon the different business segmentation in descending sub frame and the sub-frame of uplink respectively.The form of DL-MAP is as shown in table 1, and the time started is wherein represented the starting position of this segmentation with respect to the frame beginning, and the different downlink business segmentation of sign indicating number (DIUC) expression is used in different descending segmentations.Equally, also there is similar form in UL-MAP.
Concerning a certain non-AAS terminal, when this terminal will insert current system, at first want the decoded frame control head to obtain position by the random access time slot of UL-MAP mapping, carry out initial random access procedure at random access time slot then.Concerning a certain AAS terminal, if this terminal can the decoded frame control head and want to carry out initial random access at random access time slot, this process and non-AAS terminal is the same so.Otherwise this terminal can directly be carried out initial random access by AAS alarm time slot.Insert flow graph as shown in Figure 6.
The present invention introduces a new downlink business segmentation for the AAS system, is referred to as the AAS indicating device.We distribute a new descending segmentation to use sign indicating number for this AAS indicating device, contain this descending segmentation and use the DL-MAP of sign indicating number to indicate the position at this AAS indicating device place.Fig. 1 is the illustration of AAS indicating device in the frame structure of TDD system.
The AAS indicating device is a kind of known in advance access lead, and two kinds of structures can be arranged:
First kind of structure as shown in Figure 7, this indicating device comprises two parts, first is made of a Cyclic Prefix and an OFDM symbol, this OFDM is made of four subdivisions, wherein first is identical with the 3rd subdivision, second is identical with the 4th subdivision and be the contrary sign of the first and the 3rd subdivision, and second portion is to be made of a Cyclic Prefix and an OFDM symbol, and this OFDM is made of two identical repeating parts.
Second kind of structure as shown in Figure 8, this indicating device comprises two parts, first is made of a Cyclic Prefix and an OFDM symbol, this OFDM is made of four subdivisions, wherein first is identical with the 3rd sub-subdivision, second is identical with the 4th subdivision and be the contrary sign of the first and the 3rd subdivision, and second portion is to be made of a Cyclic Prefix and an OFDM symbol, and this OFDM symbol is made of two repeating parts with contrary sign.
Correspond to 802.16 256 ofdm system patterns and Hiperman OFDM pattern, the A part in AAS indicator structure one and structure two and the length of AI part are 64, and the length of B and BI is 128.
In ofdm system, known training symbol is on frequency domain known sequences to be done quick inverse-Fourier transform (IFFT) to obtain, and we claim that this kind sequence is a frequency domain training sequence.
If frequency domain training sequence is { p
i| i=-N/2 ..., N/2-1} wherein N is an IFFT length, corresponding OFDM modulated sub-carriers (subcarrier) label of i so, can get known training symbol
In 256 OFDM patterns, always have 256 subcarriers, label respectively from-128 to 127, only with wherein 200 subcarriers, label is-100 to-1 and 1 to 100.
In order to produce the signal of first in AAS indicator structure one and the structure two, adopted following frequency domain training sequence
{p1
i|i＝-100∶100}＝{0，0，+1+j，0，0，0，+1+j，0，0，0，+1+j，0，0，0，+1-j，0，0，0，-1+j，0，0，0，+1+j，0，0，0，+1+j，0，0，0，+1+j，0，0，0，+1-j，0，0，0，-1+j，0，0，0，+1+j，0，0，0，+1+j，0，0，0，+1+j，0，0，0，+1-j，0，0，0，-1+j，0，0，0，+1-j，0，0，0，+1-j，0，0，0，+1-j，0，0，0，-1-j，0，0，0，+1+j，0，0，0，-1+j，0，0，0，-1+j，0，0，0，-1+j，0，0，0，+1+j，0，0，0，-1-j，0，0，0，+1+j，0，0，0，-1-j，0，0，0，+1-j，0，0，0，+1+j，0，0，0，-1-j，0，0，0，-1+j，0，0，0，+1-j，0，0，0，+1+j，0，0，0，-1+j，0，0，0，+1-j，0，0，0，-1-j，0，0，0，+1+j，0，0，0，-1+j，0，0，0，-1-j，0，0，0，+1+j，0，0，0，+1-j，0，0，0，-1-j，0，0，0，+1-j，0，0，0，+1+j，0，0，0，-1-j，0，0，0，-1+j，0，0，0，-1+j，0，0，0，-1-j，0，0，0，+1-j，0，0，0，-1+j，0，0}*W
Here only provide the value of i from-100 to 100, what do not provide is zero, and wherein W is a fixed numeric values.
In order to produce the signal of second portion in the AAS indicator structure one, adopted following frequency domain training sequence
{p2
i|i＝-100∶100}＝{1，0，-1，0，-1，0，-1，0，1，0，1，0，1，0，1，0，-1，0，1，0，-1，0，-1，0，-1，0，1，0，-1，0，1，0，1，0，1，0，1，0，-1，0，1，0，1，0，1，0，-1，0，1，0，-1，0，1，0，1，0，-1，0，-1，0，1，0，-1，0，1，0，-1，0，1，0，1，0，-1，0，1，0，1，0，-1，0，-1，0，-1，0，1，0，-1，0，-1，0，-1，0，-1，0，-1，0，1，0，1，0，0，0，1，0，-1，0，-1，0，1，0，-1，0，1，0，1，0，1，0，1，0，-1，0，1，0，1，0，1，0，1，0，-1，0，1，0，-1，0，-1，0，-1，0，-1，0，1，0，1，0，-1，0，1，0，-1，0，-1，0，-1，0，-1，0，-1，0，-1，0，-1，0，-1，0，1，0，1，0，1，0，-1，0，-1，0，-1，0，1，0，1，0，-1，0，-1，0，-1，0，1，0，-1，0，-1，0，1，0，-1，0，-1，0，-1}*W
Here only provide the value of i from-100 to 100, what do not provide is zero, and wherein W is a fixed numeric values.
In order to produce the signal of second portion in the AAS indicator structure two, adopted following frequency domain training sequence { p3
i|i＝-100∶100}＝{0-1 0 1 0 1 0 1 0 1 0 1 0 1 0-10-1 0 1 0-1 0 1 0-1 0 1 0 1 0 1 0-1 0-10 1 0-1 0 1 0-1 0-1 0 1 0 1 0 1 0 1 0-10-1 0-1 0 1 0 1 0 1 0 1 0-1 0 1 0 1 0 1 0-1 0 1 0 1 0 1 0 1 0 -1 0-1 0-1 0-1 0-1 0-1 0 1 0 1 0 1 0-1 0 -1 0 1 0 1 0 1 0 1 0-1 0-1 0 1 0-1 0 1 0 1 0 1 0 1 0-1 0-1 01 0 1 0-1 0-1 0 1 0 -1 0 1 0 1 0 1 0 1 01 0 1 0 1 0-1 0 1 0 -1 0 1 0-1 0-1 0-1 0-1 0-1 0 1 0-1 0-1 0 -1 0-1 0 1 0-1 0 1 01 0-1 0}*W
Here only provide the value of i from-100 to 100, what do not provide is zero, and wherein W is a fixed numeric values.
According to above-mentioned frequency domain training sequence, sequence is carried out the BPSK modulation on the subcarrier of the subchannel of correspondence, when realizing, can require suitably to adjust average power according to the conditioned disjunction power emission of air traffic channel, promptly adjust the value of W, just can reach the purpose of power ascension or power pressure drop.Through after the IFFT, obtain corresponding AAS indicating device.
The AAS indicating device can be put into any position of FCH back in the descending sub frame, but needs a new DL-MAP unit to hint obliquely at its position.Correspond to 802.16 256 ofdm system patterns and HipermanOFDM pattern, the present invention has introduced a new DL-MAP unit as shown in Table 2.The DUIC value of this unit is 15, and the value of Kuo Zhan DIUC is in 3 to 15 one simultaneously.The other-end of communicating by letter with BS with regard to assurance is known the position of this AAS indicating device by this information of decoding like this, thereby skips this traffic segment.
The present invention introduces the AAS indicating device, and to indicate current system be the AAS system, in the AAS system in conjunction with the AAS indicating device, when the AAS terminal wants to come preliminary examination to insert this system by AAS alarm time slot, must at first will catch this AAS indicating device.Can know that so just current system is the AAS system, and have AAS alarm time slot.
The AAS indicating device indicates not only whether current system is the AAS system, also indicates present frame whether to have AAS alarm time slot simultaneously.The AAS base station is when scheduling resource, guarantee that the AAS indicating device bundles, that is to say, when when there is the AAS indicating device in current descending sub frame, just there is AAS alarm time slot certainly in so current sub-frame of uplink, corresponding to 802.16 256 ofdm system patterns and Hiperman OFDM pattern, AAS alarm time slot is a last L OFDM symbol of current sub-frame of uplink.Otherwise just there is not AAS alarm time slot in current sub-frame of uplink.
In the AAS system in conjunction with the AAS indicating device, the AAS terminal at first will be determined the starting position of frame by the access lead of frame beginning when start or restarting.If this terminal is want to come connecting system by AAS warning time slot, search descending sub frame so and see and have the AAS indicating device.After finding the AAS indicating device, this terminal is determined the position of the AAS alarm time slot that in advance just defines by the beginning of present frame, carry out system at AAS alarm time slot then and initially insert.Flow graph as shown in Figure 9.
Based on the method difference of AAS base station at scheduling resource, AAS indicating device that another is general and AAS alarm time slot binding scheme are that n (n is more than or equal to the 0) sub-frame of uplink that the AAS indicating device indication of current descending sub frame is counted from present frame backward exists AAS alarm time slot to m (m is more than or equal to n) sub-frame of uplink.Corresponding to 802.16 256 ofdm system patterns and Hiperman OFDM pattern, if there is the AAS indicating device in current descending sub frame, so from present frame backward n (n is more than or equal to the 0) sub-frame of uplink of number be AAS alarm time slot to last L OFDM symbol of m (m is more than or equal to n) sub-frame of uplink.
In the AAS system in conjunction with the AAS indicating device, the AAS terminal at first will be determined the starting position of frame by the access lead of frame beginning when start or restarting.If this terminal is want to come connecting system by AAS alarm time slot, search descending sub frame so and see and have the AAS indicating device.After finding the AAS indicating device, this terminal by from present frame backward n (n is more than or equal to the 0) frame of number determine to the beginning of every frame of m (m is more than or equal to n) frame the position of the AAS alarm time slot that in advance just defines to carry out system at AAS alarm time slot then and initially insert.
[table 1] DL-MAP cell format
Sentence structure
Length
Note
DL-MAP format content ()
Sign indicating number (DIUC) is used in descending segmentation
4 bits
If (DIUC==15)
The DIUC of expansion
Variable length
Report_IE()_or?AAS_DL_IE()_or?STC_IE()?or?AAS_INDICATOR_IE()
Otherwise
Time started
12 bits
}
[table 2] AAS instigates device to hint obliquely at cell format
Sentence structure
Length
Note
AAS instigate device unit ()
DIUC
4 bits
DIUC＝15
Expansion DIUC
4 bits
(A is more than or equal to 3 for AAS indicating device=A
And A is less than or equal to 15)
Time started
12 bits
Keep }
4 bits
Claims (20)
1. the production method of new training symbol in the ofdm system, described orthogonal FDM communication system has N subcarrier, use therein subcarrier is L, every transmission frame-form comprises descending sub frame and sub-frame of uplink, the beginning of descending sub frame is an access lead, and described method comprises step:
In the base station, produce a kind of new training symbol;
Described training symbol transmits in descending sub frame, and described training symbol is controlled by Downlink Control Information at the transmission location of descending sub frame;
Described training symbol maps from present frame backward the n of number be random access time slot to the known location of m sub-frame of uplink.
2. by the described method of claim 1, it is characterized in that comprising step:
When subscriber access system, the access lead that at first will catch descending sub frame is determined the beginning of frame;
And then whether the searching downlink subframe exist described training symbol, if exist, this user just can be at the random access time slot connecting system of this training symbol maps so;
If there is no, whether access lead and this frame descending sub frame of search of catching next frame so exist described training symbol, find till the random access time slot by this training symbol maps always.
3. by the described method of claim 1, it is characterized in that a described carrier number N=256 subcarrier, label is-128 to 127.
4. by the described method of claim 1, it is characterized in that described training symbol comprises two parts, every part is made up of an OFDM symbol and Cyclic Prefix thereof.
5, by the described method of claim 4, it is characterized in that described OFDM symbol is by inserting frequency domain training sequence on the subcarrier that uses, carrying out inverse-Fourier transform and generate
6. by the described method of claim 4, it is characterized in that described training symbol divides two parts, first is made of a Cyclic Prefix and an OFDM symbol, this OFDM is made of four subdivisions, wherein first is identical with the 3rd subdivision, second is identical with the 4th subdivision and be the contrary sign of the first and the 3rd subdivision, and second portion is to be made of a Cyclic Prefix and an OFDM symbol, and this OFDM is made of two identical repeating parts.
7. by the described method of claim 5, it is characterized in that label for [100 ..., 100] subcarrier on insert frequency domain training sequence { p1 accordingly
i| i=-100: 100} carries out the OFDM symbol and the first of its Cyclic Prefix as this indicating device that inverse-Fourier transform obtains
{ p1 wherein
i| i=-100: 100} is as follows:
{0，0，+1+j，0，0，0，+1+j，0，0，0，+1+j，0，0，0，+1-j，0，0，0，-1+j，0，0，0，+1+j，0，0，0，+1+j，0，0，0，+1+j，0，0，0，+1-j，0，0，0，-1+j，0，0，0，+1+j，0，0，0，+1+j，0，0，0，+1+j，0，0，0，+1-j，0，0，0，-1+j，0，0，0，+1-j，0，0，0，+1-j，0，0，0，+1-j，0，0，0，-1-j，0，0，0，+1+j，0，0，0，-1+j，0，0，0，-1+j，0，0，0，-1+j，0，0，0，+1+j，0，0，0，-1-j，0，0，0，+1+j，0，0，0，-1-j，0，0，0，+1-j，0，0，0，+1+j，0，0，0，-1-j，0，0，0，-1+j，0，0，0，+1-j，0，0，0，+1+j，0，0，0，-1+j，0，0，0，+1-j，0，0，0，-1-j，0，0，0，+1+j，0，0，0，-1+j，0，0，0，-1-j，0，0，0，+1+j，0，0，0，+1-j，0，0，0，-1-j，0，0，0，+1-j，0，0，0，+1+j，0，0，0，-1-j，0，0，0，-1+j，0，0，0，-1+j，0，0，0，-1-j，0，0，0，+1-j，0，0，0，-1+j，0，0}*W
W is a fixed numeric values,
At label be [100 ..., 100] subcarrier on insert frequency domain training sequence { p2 accordingly
i| i=-100: 100} carries out the OFDM symbol and the second portion of its Cyclic Prefix as this indicating device that inverse-Fourier transform obtains
{ p2 wherein
i| i=-100: 100} is as follows:
{1，0，-1，0，-1，0，-1，0，1，0，1，0，1，0，1，0，-1，0，1，0，-1，0，-1，0，-1，0，1，0，-1，0，1，0，1，0，1，0，1，0，-1，0，1，0，1，0，1，0，-1，0，1，0，-1，0，1，0，1，0，-1，0，-1，0，1，0，-1，0，1，0，-1，0，1，0，1，0，-1，0，1，0，1，0，-1，0，-1，0，-1，0，1，0，-1，0，-1，0，-1，0，-1，0，-1，0，1，0，1，0，0，0，1，0，-1，0，-1，0，1，0，-1，0，1，0，1，0，1，0，1，0，-1，0，1，0，1，0，1，0，1，0，-1，0，1，0，-1，0，-1，0，-1，0，-1，0，1，0，1，0，-1，0，1，0，-1，0，-1，0，-1，0，-1，0，-1，0，-1，0，-1，0，-1，0，1，0，1，0，1，0，-1，0，-1，0，-1，0，1，0，1，0，-1，0，-1，0，-1，0，1，0，-1，0，-1，0，1，0，-1，0，-1，0，-1}*W
W is a fixed numeric values.
8. by the described method of claim 4, it is characterized in that training symbol divides two parts, first is made of a Cyclic Prefix and an OFDM symbol, this OFDM is made of four subdivisions, wherein first is identical with the 3rd subdivision, second is identical with the 4th subdivision and be the contrary sign of the first and the 3rd subdivision, and second portion is to be made of a Cyclic Prefix and an OFDM symbol, and this OFDM is made of two opposite repeating parts.
9: by the described method of claim 5, it is characterized in that label for [100 ..., 100] subcarrier on insert frequency domain training sequence { p1 accordingly
i| i=-100: 100} carries out the OFDM symbol and the first of its Cyclic Prefix as this indicating device that inverse-Fourier transform obtains
{ p1 wherein
i| i=-100: 100} is as follows:
{0，0，+1+j，0，0，0，+1+j，0，0，0，+1+j，0，0，0，+1-j，0，0，0，-1+j，0，0，0，+1+j，0，0，0，+1+j，0，0，0，+1+j，0，0，0，+1-j，0，0，0，-1+j，0，0，0，+1+j，0，0，0，+1+j，0，0，0，+1+j，0，0，0，+1-j，0，0，0，-1+j，0，0，0，+1-j，0，0，0，+1-j，0，0，0，+1-j，0，0，0，-1-j，0，0，0，+1+j，0，0，0，-1+j，0，0，0，-1+j，0，0，0，-1+j，0，0，0，+1+j，0，0，0，-1-j，0，0，0，+1+j，0，0，0，-1-j，0，0，0，+1-j，0，0，0，+1+j，0，0，0，-1-j，0，0，0，-1+j，0，0，0，+1-j，0，0，0，+1+j，0，0，0，-1+j，0，0，0，+1-j，0，0，0，-1-j，0，0，0，+1+j，0，0，0，-1+j，0，0，0，-1-j，0，0，0，+1+j，0，0，0，+1-j，0，0，0，-1-j，0，0，0，+1-j，0，0，0，+1+j，0，0，0，-1-j，0，0，0，-1+j，0，0，0，-1+j，0，0，0，-1-j，0，0，0，+1-j，0，0，0，-1+j，0，0}*W
W is a fixed numeric values,
This device will be at label [100 ..., 100] subcarrier on insert frequency domain training sequence { p3 accordingly
i| i=-100: 100} carries out the OFDM symbol and the second portion of its Cyclic Prefix as this indicating device that inverse-Fourier transform obtains
{ p3 wherein
i|i＝-100∶100}：{0-1 0 1 0 1 0 1 0 1 0 1 0 1 0-10-1 0 1 0-1 0 1 0-1 0 1 0 1 0 10-1 0-1 0 1 0-1 0 1 0-1 0-1 0 10 1 0 1 0 1 0-1 0-1 0-1 0 1 0 10 1 0 1 0-1 0 1 0 1 0 1 0-1 0 10 1 0 1 0 1 0-1 0-1 0-1 0-1 0-10-1 0 1 0 1 0 1 0-1 0-1 0 1 0 10 1 0 1 0-1 0-1 0 1 0-1 0 1 0 10 1 0 1 0-1 0-1 0 1 0 1 0-1 0-10 1 0-1 0 1 0 1 0 1 0 1 0 1 0 10 1 0-1 0 1 0-1 0 1 0-1 0-1 0-10-1 0-1 0 1 0-1 0-1 0-1 0-1 0 10-1 0 1 0 1 0-1 0}*W。
W is a fixed numeric values.
10. the transmission method of new training symbol in the ofdm system, described orthogonal FDM communication system has N subcarrier, and use therein subcarrier is L, and every transmission frame-form comprises descending sub frame and sub-frame of uplink, and described method comprises step:
Training symbol transmits at descending sub frame, and the position of described training symbol in descending sub frame controlled by the frame control head in the descending sub frame.
11., it is characterized in that in frame control head that described training symbol is as shown in table 1 in the control information of descending sub frame transmission by the described method of claim 10, it is 15 that code value is used in descending segmentation wherein, has used expansion DIUC to come this training symbol of mark simultaneously.
12., it is characterized in that in frame control head that training symbol is as shown in table 2 in the control information of descending sub frame transmission by the described method of claim 11, the value of expansion DIUC is from 3 to 15.
13., it is characterized in that in frame control head that training symbol is as shown in table 2 in the control information of descending sub frame transmission by the described method of claim 12, the value of expansion DIUC is 3.
14., it is characterized in that the adaptive antenna system alarm slot transmission of described training symbol binding sub-frame of uplink by the described method of claim 10.
15., it is characterized in that described training symbol indication adaptive antenna system alarm time slot occurs to the known location of m sub-frame of uplink at the n that counts from present frame backward by the described method of claim 14.
16. by the described method of claim 15, it is characterized in that described training symbol indication from present frame backward the n of number be adaptive antenna system alarm time slot to last L OFDM symbol of m sub-frame of uplink.
17. by the described method of claim 16, it is characterized in that the indication of adaptive antenna system indicating device from present frame backward the n of number be adaptive antenna system alarm time slot to last 5 OFDM symbols of m sub-frame of uplink.
18., it is characterized in that described training symbol indication adaptive antenna system alarm time slot occurs in the known location of current sub-frame of uplink by the described method of claim 14.
19., it is characterized in that described training symbol indication adaptive antenna system alarm time slot is a last L OFDM symbol of current sub-frame of uplink by the described method of claim 18.
20., it is characterized in that described training symbol indication adaptive antenna system alarm time slot is last 5 OFDM symbols of current sub-frame of uplink by the described method of claim 19.
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| CN100455110C (en) * | 2005-06-06 | 2009-01-21 | 华为技术有限公司 | Random access channel distribution and access method |
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| US11381362B2 (en) | 2008-04-25 | 2022-07-05 | Nokia Technologies Oy | Apparatus, methods, and computer program products providing an indication of cyclic prefix length |
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