CN101383811B - Frame structure in communication system, frame receiving method and device thereof - Google Patents

Frame structure in communication system, frame receiving method and device thereof Download PDF

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CN101383811B
CN101383811B CN2007100456353A CN200710045635A CN101383811B CN 101383811 B CN101383811 B CN 101383811B CN 2007100456353 A CN2007100456353 A CN 2007100456353A CN 200710045635 A CN200710045635 A CN 200710045635A CN 101383811 B CN101383811 B CN 101383811B
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reference symbol
time slot
channel estimation
data division
estimation results
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CN101383811A (en
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简相超
吴涛
师延山
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Spreadtrum Communications Shanghai Co Ltd
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Spreadtrum Communications Shanghai Co Ltd
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Abstract

The invention discloses a frame structure, a frame receiving method and a device in a communication system, which improve the receiving performance of a terminal and reduce the complexity of a terminal receiver on the premise of keeping constant spectrum effectiveness. The technical proposal is as follows: a time slot structure of the frame structure is composed of a leading reference symbol part and a data part; the leading reference symbol part is composed of a cyclic prefix and a reference symbol basic code which is divided into a first reference symbol basic code and a second reference symbol basic code; wherein the second reference symbol basic code is partially distributed at the front end of a time slot as a front reference symbol; the cyclic prefix and the first reference symbol basic code form a rear reference symbol and are partially distributed at the rear end of the time slot; and the data part is positioned between the front reference symbol part and the rear reference symbol part. The invention is applied in the field of mobile communication.

Description

Frame structure in a kind of communication system and frame method of reseptance and device
Technical field
The present invention relates to frame structure and frame method of reseptance and device in the communication system, relate in particular to frame structure and frame method of reseptance and device that the reference symbol with complete in a kind of communication system is distributed in the time slot two ends.
Background technology
In traditional broadcast system, analog television broadcast for example is in order to expand the coverage area, the adjacent transmission platform uses different frequency to avoid the phase mutual interference, same frequency must ability be multiplexing in addition at certain distance, Here it is multiple frequency network, MFN (Multi-Frequency Network, MFN) mode.Under this mode, one road signal need take several times frequency bandwidth, has consumed valuable frequency spectrum resource.
Along with being becoming tight frequency spectrum resource day and the development of signal processing technology, the networking mode of SFN becomes focus.So-called single frequency network (SFN) is meant that the same time of several transmitting stations launch same signal on same frequency, with the reliable covering of realization to certain service area.The largest benefit that single frequency network is brought is the raising of spectrum efficiency.Send one road signal in the coverage and only need a frequency, for the television broadcasting of the big bandwidth of need, this advantage is more outstanding.The diversity that a plurality of transmitting station synchronous workings are brought makes that also the reliability that receives is enhanced, and obtains better program coverage rate.In addition, by adjustment and optimization to transmit network (as the height of the quantity of transmitter, distribution, individual transmitter, transmitting power etc.), also can reduce total power consumption, alleviate interference, even change the distribution of overlay area as required easily and flexibly near other networks.
The proposition and the multi-carrier modulation of single frequency network interrelate, for example OFDM (OrthogonalFrequency Division Multiplexing, OFDM).(LongTerm Evolution LTE) in the standard of being worked out, has introduced OFDM to the Long Term Evolution project of 3GPP normal structure, adopts orthogonal frequency division multiplexing multiple access (OFDMA) mode.When it works in TDD mode, a kind of frame structure wherein, basic identical with the frame structure of present TD-SCDMA system.
For cdma system, under the single frequency network pattern, come from the signal of different base station, can be moved terminal and think multipath signal, and then carry out diversity and handle.But to a certain extent, the CDMA single frequency network increases to the disposal ability of its receiver.A main change is, receiver want to tolerate more long delay and its power may with the suitable multipath signal of main footpath signal.Therefore, between each base station regularly synchronously, the data synchronization that sends, the receptivity of portable terminal is had a significant impact.
Fig. 1 shows a typical cell mobile communication systems.This system is by a plurality of sub-districts 100 1～100 zConstitute, a base station (NodeB) 101 is wherein respectively arranged in each sub-district 1～101 z, there is the user terminal (UE) 102 of some in the while in this sub-district service range 1～102 kFor example, to sub-district 100 1, each user terminal 102 1～102 kBy with affiliated Serving cell in base station 101 1Keep to connect, finish and other communication equipment between communication function.The channel that communicates between user terminal and the base station is called as up channel from the channel of user terminal to base station direction, and the channel from the base station to the user terminal direction is called as down channel.Base station 101 1～101 zControlled and managed by radio network controller (RNC) 103 again.By base station 101 1～101 z, radio network controller 103 and other network element devices together, just constituted land radio access web (UTRAN) 110.
TD-SCDMA is a part of 3G standard.There are a plurality of carrier resources a sub-district of present TD-SCDMA system.
Fig. 2 shows the frame structure of TD-SCDMA system.This structure is according to providing in low spreading rate time division duplex (LCR-TDD) pattern (1.28Mcps) among 3G collaborative project (3GPP) the standard TS 25.221 (Release 4).The spreading rate of TD-SCDMA system is 1.28Mcps, and the length of each radio frames (Radio Frame) 200 is 10ms, and is divided into two subframes 201 that structure is identical 0, 201 1, the length of each subframe is 5ms, i.e. 6400 chips.Wherein, (for example subframe 201 for the subframe in each TD-SCDMA system 0) (TS0～TS6) 202 can be divided into 7 time slots again 0～202 6, two pilot time slots (descending pilot frequency time slot (DwPTS) 203 and uplink pilot time slot (UpPTS) 205) and protection (Guard) 204 at interval.Further, the TS0 time slot 202 0Be used to bearing system broadcast channel and other possible downlink traffic channel; And TS1～TS6 time slot 202 1～202 6Then be used to carry the uplink and downlink Traffic Channel.It is synchronous that uplink pilot time slot (UpPTS) 205 and descending pilot frequency time slot (DwPTS) 203 are used to set up initial uplink and downlink respectively.TS0～TS6 time slot 202 0～202 6Length is 0.675ms or 864 chips, wherein comprise data segment (Data Part 1) 208 and (Data Part 2) 210 that two segment lengths are 352 chips, and a middle segment length is the reference symbol of 144 chips---in lead sign indicating number (Midamble) sequence 209.Middle guiding code sequence 209 is significant in the TD-SCDMA system, comprise cell ID, channel estimating and synchronously modules such as (comprising Frequency Synchronization) all to use it.The protection that descending pilot frequency time slot (DwPTS) 203 comprises 32 chips at interval 211 and one long be descending synchronous code (SYNC-DL) code word 206 of 64 chips, its effect is cell ID and sets up initial synchronisation; And uplink pilot time slot (UpPTS) comprise one long be uplink synchronous code (SYNC-UL) code word 207 of 128 chips, subscriber terminal equipment utilizes it to carry out relevant up access procedure.At TS1～TS6 time slot 202 1～202 6Between a transfer point (Switching Point) 212 is arranged.When the up-downgoing ratio was 3: 3, transfer point (Switching Point) 212 was positioned at TS3～TS4 time slot 202 3～202 4Between, at this moment, the employed up Dedicated Traffic Channel of user terminal is dispensed on TS1～TS3 time slot 202 1～202 3In, the descending TS4～TS6 time slot 202 that then is distributed in usually 4～202 6In.
Broadcast type multimedia services such as mobile TV belong to downlink broadcast class business.In order to provide more multimedia service on a carrier wave, a kind of complete descending special carrier technology is suggested, and promptly all time slots on carrier wave are descending time slot.Special carrier among the TD-SCDMA can be formed single frequency network usually, i.e. the SFN special carrier.Because use the SFN technology, identical signal sends simultaneously in more wide different place, causes the time delay between multipath signal bigger.In order to adapt to bigger time delay, a kind of new frame structure is suggested.
As shown in Figure 3, be TD-SCDMA special carrier structure of time slot schematic diagram.In this structure, time slot 302 is made of a leading reference symbol (PreAmble) part 309 and data division (Data Part) 308.Each leading reference symbol (PreAmble) 309 is made of 313 and reference symbol basic codes of a Cyclic Prefix (CP) (PA Code) 314, and wherein Cyclic Prefix (CP) 313 is identical with the afterbody of reference symbol basic code (PA Code) 314.Cyclic Prefix (CP) 313 is usually designed to 32 or 48 chips, so that adapt to the big situation of SFN network multi-path time delay.Current time slots in the length of this time slot 302 and the TD-SCDMA frame structure (for example 2022) length is identical, i.e. 864 chips.When special carrier,, descending pilot frequency time slot (DwPTS) 203, protection interval 204 and uplink pilot time slot (UpPTS) 205 can be merged in addition, constitute a crack in short-term owing to be downlink business entirely; Its structure is identical with special carrier time slot 302, but data division is shorter, and slot length is 352 chips.
Leading reference symbol (PreAmble) the 309th, reference symbol a kind of.Reference symbol is known in transmitting terminal institute's transmission content and radiation pattern at receiving terminal.User terminal compares the reference symbol that receives and known content, and then realizes channel estimating.If reference symbol is very near with the data distance that will receive, then can be similar to the channel status of deriving data division with channel estimating to reference symbol.
Therefore, from Fig. 3 as seen, there is following problem in leading reference symbol (PreAmble) 309 in the previous section of time slot:
The first, in a time slot 302, data division 308 has only an end that leading reference symbol (PreAmble) 309 is arranged.If user terminal does not receive the leading reference symbol (PreAmble) 310 of this time slot back time slot 303, and the channel estimation results that uses two leading reference symbols (PreAmble) comes interpolation to estimate the channel parameter of data division 308, then can only come the channel status of extrapolated data division 308 according to measurement to leading reference symbol (PreAmble) 309.And extrapolation will cause the data division 308 leading reference symbol of distance (PreAmble) 309 part far away more, and channel estimating performance is poor more, and then receptivity is also poor more.
The second, the aft section of reference symbol basic code (PA Code) 314 and hydraulic circulating head (CP) the 313rd, identical, and the part of the CP between two time slots also is identical, promptly the hydraulic circulating head of time slot i (CP) 313 is identical with hydraulic circulating head (CP) 315 of time slot i+1.Therefore each hydraulic circulating head (CP) and then of the both sides of data division 308.This characteristic helps the reception of user terminal data portion.Yet by the structure of time slot of existing Fig. 3, in the scope of a time slot 302, the two ends of data division 308 do not have the characteristic adjacent with identical CP.
The 3rd, in order to improve the receptivity of data division 308, user terminal needs further to receive leading reference symbol (PreAmble) 310 parts of the affiliated time slot of this data division that time slot afterwards.Then user terminal will just can carry out the channel estimating of data division after receiving leading reference symbol (PreAmble) 310, and and then data portion 308 handle.This has incured loss through delay the processing time of user terminal data portion 308.When user terminal receives professional data transfer rate when higher, for example receive a plurality of time slots continuously, the then minimizing in data portion processing time can improve the requirement to user terminal receiver ability, and then raise the cost.
The 4th, exist under the situation of a plurality of special carriers, when user terminal receives a plurality of broadcasting service, may between different carrier waves, switch.User terminal may when also not receiving leading reference symbol (PreAmble) part of next time slot, just need switch to other frequencies after the content of receiving a time slot.Under this scene, user terminal can't estimate the channel situation of middle data division by two adjacent leading reference symbol (PreAmble) interpolation that receive, and then has reduced the receptivity of data division.
Therefore, for the mobile TV class broadcasting service on the special carrier, the present frame structure that proposes of TD-SCDMA system also needs to be optimized and improves.
Summary of the invention
The objective of the invention is to address the above problem, the frame structure in a kind of communication system is provided, adapt to broadcasting services such as mobile TV, keep spectrum efficiency constant, method is simple and be easy to realize.
Another object of the present invention has provided frame method of reseptance and the device in a kind of communication system, is applicable to the reception of above-mentioned frame structure, in the receptivity that keeps improving under the constant prerequisite of spectrum efficiency terminal, has reduced the complexity of terminal receiver.
Technical scheme of the present invention is: the present invention has disclosed the frame structure in a kind of communication system, the structure of time slot of this frame structure is made of leading reference symbol part and data division, this leading reference symbol is made of a Cyclic Prefix and a reference symbol basic code, it is characterized in that, this reference symbol basic code is divided into the first reference symbol basic code and the second reference symbol basic code, wherein this second partly is distributed in the time slot front end with reference to basic code as preceding reference symbol, this Cyclic Prefix and this first reference symbol basic code are formed the back reference symbol and partly are distributed in the time slot rear end, and this data division is clipped between this preceding reference symbol part and this back reference symbol part.
Frame structure in the above-mentioned communication system, wherein, the preceding reference symbol part of each time slot partly constitutes a complete reference symbol with the back reference symbol of last time slot; The back reference symbol part of each time slot partly constitutes a complete reference symbol with the preceding reference symbol of back one time slot; The preceding reference symbol of each time slot constitutes a complete reference symbol after partly moving the back reference symbol part back and connection of this time slot.
Frame structure in the above-mentioned communication system, wherein, the length of the preceding reference symbol part of each time slot is greater than the length of this time slot Cyclic Prefix.
Frame structure in the above-mentioned communication system, wherein, the equal in length of this preceding reference symbol part and this back reference symbol part.
Frame structure in the above-mentioned communication system, wherein, this reference symbol basic code sequence comprises middle guiding code sequence, Zadoff-Chu sequence, the M sequence of communication system.
The present invention has also disclosed the frame method of reseptance in a kind of communication system, comprising:
Receive wireless signal, obtain baseband signal after the radio frequency processing, the structure of time slot of frame structure is made of leading reference symbol part and data division, this leading reference symbol is made of a Cyclic Prefix and a reference symbol basic code, this reference symbol basic code is divided into the first reference symbol basic code and the second reference symbol basic code, wherein this second partly is distributed in the time slot front end with reference to basic code as preceding reference symbol, this Cyclic Prefix and this first reference symbol basic code are formed the back reference symbol and partly are distributed in the time slot rear end, and this data division is clipped between this preceding reference symbol part and this back reference symbol part;
Current time slots is carried out the frequency shift (FS) calibration;
Judge whether to exist the channel estimating event memory of the complete reference symbol in last time slot data division rear end and the preceding reference symbol part that has received a back time slot;
If have the channel estimating event memory of the complete reference symbol in last time slot data division rear end and the preceding reference symbol part that has received a back time slot, then do channel estimating one time, and the channel estimation results that the result of this channel estimating and the complete reference symbol in last time slot rear end of having stored are carried out is carried out obtaining behind the interpolation arithmetic channel estimation results of the data division of current time slots at the complete reference symbol of current time slots data division rear end;
The channel estimation results of the reference symbol that if there is no last time slot data division rear end is complete, and/or do not receive the back one time slot preceding reference symbol part, then the back reference symbol of current time slots rear end partly is placed on before the preceding reference symbol part of current time slots front end, carry out channel estimating to connect into complete reference symbol, with the result of this channel estimating channel estimation results as the current time slots data division;
This channel estimation results of storage current time slots data division;
Utilize this channel estimation results of the data division of current time slots, the value of demodulation current time slots data division.
Frame method of reseptance in the above-mentioned communication system, wherein, the preceding reference symbol part of each time slot partly constitutes a complete reference symbol with the back reference symbol of last time slot; The back reference symbol part of each time slot partly constitutes a complete reference symbol with the preceding reference symbol of back one time slot; The preceding reference symbol of each time slot constitutes a complete reference symbol after partly moving the back reference symbol part back and connection of this time slot.
Frame method of reseptance in the above-mentioned communication system, wherein, the length of the preceding reference symbol part of each time slot is greater than the length of this time slot Cyclic Prefix.
Frame method of reseptance in the above-mentioned communication system, wherein, the equal in length of this preceding reference symbol part and this back reference symbol part.
Frame method of reseptance in the above-mentioned communication system, wherein, this reference symbol basic code sequence comprises middle guiding code sequence, Zadoff-Chu sequence, the M sequence of communication system.
Based on above-mentioned frame method of reseptance, the present invention has also disclosed the frame receiving system in a kind of communication system, and this device comprises:
Radio-frequency module, receive wireless signal, obtain baseband signal after the radio frequency processing, the structure of time slot of frame structure is made of leading reference symbol part and data division, this leading reference symbol is made of a Cyclic Prefix and a reference symbol basic code, this reference symbol basic code is divided into the first reference symbol basic code and the second reference symbol basic code, wherein this second partly is distributed in the time slot front end with reference to basic code as preceding reference symbol, this Cyclic Prefix and this first reference symbol basic code are formed the back reference symbol and partly are distributed in the time slot rear end, and this data division is clipped between this preceding reference symbol part and this back reference symbol part;
Channel estimation module comprises:
The frequency shift (FS) alignment unit, receiving baseband signal carries out the frequency shift (FS) calibration to time slot;
The channel estimation process unit, if have the channel estimating event memory of the complete reference symbol in last time slot data division rear end and the preceding reference symbol part that has received a back time slot, then do channel estimating one time at the complete reference symbol of current time slots data division rear end, export first channel estimation results, the channel estimation results of the reference symbol that if there is no last time slot data division rear end is complete and/or do not receive the back one time slot preceding reference symbol part, then the back reference symbol of current time slots rear end partly is placed on before the preceding reference symbol part of current time slots front end, carry out channel estimating to connect into complete reference symbol, output second channel estimated result;
Interpolating module, first channel estimation results of reception current time slots from this channel estimation process unit in conjunction with the channel estimation results of last time slot, obtains first channel estimation results of current time slots data division behind interpolation arithmetic;
Select module, if have the channel estimating of the complete reference symbol in last time slot data division rear end and the preceding reference symbol part that has received a back time slot, then receive this first channel estimation results from this interpolating module, channel estimation results output as the current time slots data division, the channel estimating event memory of the reference symbol that if there is no last time slot data division rear end is complete and/or do not receive the back one time slot preceding reference symbol part, then from this channel estimation process unit, receive this second channel estimated result, export behind the channel estimation results as the current time slots data division;
Memory module receives the output valve of this selection module, and the channel estimation results of exporting last time slot data division is to this interpolating module;
Data demodulation module receives the channel estimation results of the current time slots data division of this selection module output, the value of demodulation current time slots data division.
Frame receiving system in the above-mentioned communication system, wherein, the preceding reference symbol part of each time slot partly constitutes a complete reference symbol with the back reference symbol of last time slot; The back reference symbol part of each time slot partly constitutes a complete reference symbol with the preceding reference symbol of back one time slot; The preceding reference symbol of each time slot constitutes a complete reference symbol after partly moving the back reference symbol part back and connection of this time slot.
Frame receiving system in the above-mentioned communication system, wherein, the length of the preceding reference symbol part of each time slot is greater than the length of this time slot Cyclic Prefix.
Frame receiving system in the above-mentioned communication system, wherein, the equal in length of this preceding reference symbol part and this back reference symbol part.
Frame receiving system in the above-mentioned communication system, wherein, this reference symbol basic code sequence comprises middle guiding code sequence, Zadoff-Chu sequence, the M sequence of communication system.
The present invention has disclosed the frame method of reseptance in a kind of communication system in addition, comprising:
Receive wireless signal, obtain baseband signal after the radio frequency processing, the structure of time slot of frame structure is made of leading reference symbol part and data division, this leading reference symbol is made of a Cyclic Prefix and a reference symbol basic code, this reference symbol basic code is divided into the first reference symbol basic code and the second reference symbol basic code, wherein this second partly is distributed in the time slot front end with reference to basic code as preceding reference symbol, this Cyclic Prefix and this first reference symbol basic code are formed the back reference symbol and partly are distributed in the time slot rear end, and this data division is clipped between this preceding reference symbol part and this back reference symbol part;
Current time slots is carried out the frequency shift (FS) calibration;
If both there had been the channel estimation results of the complete reference symbol in last time slot data division rear end, receive the preceding reference symbol part of back one time slot again, then the complete reference symbol of current time slots data division rear end is carried out channel estimating, and with the channel estimation results interpolation of the complete reference symbol of last time slot data back-end after obtain the channel estimation results of current time slots data division;
If neither there is the channel estimation results of the complete reference symbol in last time slot data division rear end, do not receive the preceding reference symbol part of back one time slot again, then the back reference symbol of current time slots rear end partly is placed on before the preceding reference symbol part of current time slots front end, carry out channel estimating to connect into complete reference symbol, obtain the channel estimation results of current time slots data division;
If there is the channel estimation results of the complete reference symbol in last time slot data division rear end, but do not receive the preceding reference symbol part of back one time slot, then the back reference symbol of current time slots rear end partly is placed on before the preceding reference symbol part of current time slots front end, carry out channel estimating to connect into complete reference symbol, the channel estimation results of the reference symbol that channel estimation results and last time slot rear end is complete obtains the channel estimation results of current time slots data division behind interpolation arithmetic;
The channel estimation results of the reference symbol that if there is no last time slot data division rear end is complete, but receive the preceding reference symbol part of back one time slot, then the back reference symbol of current time slots rear end partly is placed on before the preceding reference symbol part of current time slots front end, carry out channel estimating to connect into complete reference symbol, and the reference symbol that current time slots data division rear end is complete carries out channel estimating, then these two channel estimation results done the channel estimation results that obtains the current time slots data division behind the interpolation arithmetic;
The channel estimation results of storage current time slots data division;
Utilize this channel estimation results of the data division of current time slots, the value of demodulation current time slots data division.
Frame method of reseptance in the above-mentioned communication system, wherein, the preceding reference symbol part of each time slot partly constitutes a complete reference symbol with the back reference symbol of last time slot; The back reference symbol part of each time slot partly constitutes a complete reference symbol with the preceding reference symbol of back one time slot; The preceding reference symbol of each time slot constitutes a complete reference symbol after partly moving the back reference symbol part back and connection of this time slot.
Frame method of reseptance in the above-mentioned communication system, wherein, the length of the preceding reference symbol part of each time slot is greater than the length of this time slot Cyclic Prefix.
Frame method of reseptance in the above-mentioned communication system, wherein, the equal in length of this preceding reference symbol part and this back reference symbol part.
Frame method of reseptance in the above-mentioned communication system, wherein, this reference symbol basic code sequence comprises middle guiding code sequence, Zadoff-Chu sequence, the M sequence of communication system.
Based on above-mentioned frame method of reseptance, the present invention has also disclosed the frame receiving system in a kind of communication system, comprising:
Radio-frequency module, receive wireless signal, obtain baseband signal after the radio frequency processing, the structure of time slot of this frame structure is made of leading reference symbol part and data division, this leading reference symbol is made of a Cyclic Prefix and a reference symbol basic code, this reference symbol basic code is divided into the first reference symbol basic code and the second reference symbol basic code, wherein this second partly is distributed in the time slot front end with reference to basic code as preceding reference symbol, this Cyclic Prefix and this first reference symbol basic code are formed the back reference symbol and partly are distributed in the time slot rear end, and this data division is clipped between this preceding reference symbol part and this back reference symbol part;
Channel estimation module comprises:
The frequency shift (FS) alignment unit, receiving baseband signal carries out the frequency shift (FS) calibration to time slot;
The channel estimation process unit comprises:
The first channel estimation process unit partly is placed on the back reference symbol of current time slots rear end before the preceding reference symbol part of current time slots front end, carries out channel estimating to connect into complete reference symbol;
Second channel is estimated processing unit, and the complete reference symbol behind the current time slots data division is carried out channel estimating;
Interpolating module, connect this first channel estimation process unit and this second channel estimation processing unit, at the channel estimation results that has last time slot data division rear end complete reference symbol and do not receive under the situation of preceding reference symbol part of back one time slot, receive the channel estimation results of this first channel estimation process unit, in conjunction with the complete reference mark channel estimated result behind the last time slot data division, carry out exporting as first channel estimation results behind the interpolation arithmetic; At the channel estimation results that has last time slot data division rear end complete reference symbol and receive under the situation of preceding reference symbol part of back one time slot, receive this second channel and estimate the channel estimation results of processing unit, in conjunction with the complete reference mark channel estimated result behind the last time slot data division, carry out exporting as the second channel estimated result behind the interpolation arithmetic; At the channel estimation results that does not have last time slot data division rear end complete reference symbol and receive under the situation of preceding reference symbol part of back one time slot, receive this first channel estimation process unit and this second channel and estimate the channel estimation results of processing unit, carry out exporting as the 3rd channel estimation results behind the interpolation arithmetic;
Select module, not only there is the channel estimation results of last time slot data division rear end complete reference symbol but also do not receive under the preceding reference symbol situation partly of back one time slot, select this first channel estimation results of this interpolating module, as the channel estimation results output of current time slots data division; Not only there is the channel estimation results of last time slot data division rear end complete reference symbol but also receive under the preceding reference symbol situation partly of back one time slot, receive this second channel estimated result of this interpolating module, as the channel estimation results output of current time slots data division; Receive again at the channel estimation results that neither has last time slot data division rear end complete reference symbol under the preceding reference symbol situation partly of back one time slot, receive the 3rd channel estimation results of this interpolating module, as the channel estimation results output of current time slots data division; Do not receive again at the channel estimation results that neither has last time slot data division rear end complete reference symbol under the preceding reference symbol situation partly of back one time slot, receive the output valve of this first channel estimation process unit of this channel estimation module, as the channel estimation results output of current time slots data division;
Memory module receives the output valve of this selection module, and the channel estimation results of exporting last time slot data division is to this interpolating module;
Data demodulation module receives the channel estimation results of the current time slots data division of this selection module output, the value of demodulation current time slots data division.
Frame receiving system in the above-mentioned communication system, wherein, the preceding reference symbol part of each time slot partly constitutes a complete reference symbol with the back reference symbol of last time slot; The back reference symbol part of each time slot partly constitutes a complete reference symbol with the preceding reference symbol of back one time slot; The preceding reference symbol of each time slot constitutes a complete reference symbol after partly moving the back reference symbol part back and connection of this time slot.
Frame receiving system in the above-mentioned communication system, wherein, the length of the preceding reference symbol part of each time slot is greater than the length of this time slot Cyclic Prefix.
Frame receiving system in the above-mentioned communication system, wherein, the equal in length of this preceding reference symbol part and this back reference symbol part.
Frame receiving system in the above-mentioned communication system, wherein, this reference symbol basic code sequence comprises middle guiding code sequence, Zadoff-Chu sequence, the M sequence of communication system.
The present invention contrasts prior art following beneficial effect: by improvement and the present invention designed frame method of reseptance and the device of the present invention to frame structure, to be used for the two ends that the channel estimating reference symbol is distributed in the time slot data division, like this when the reference symbol of the previous time slot rear end of this a time slot reference symbol part and a back time slot front end is partly launched and is received, channel estimating all can be carried out according to complete reference symbol in this time slot rear and front end, interpolation obtains the channel parameter data of data division then, and this moment, the frame structure of receptivity and prior art was consistent.
The present invention does not exist or is not received when handling in last time slot rear end reference symbol part or back one time slot front end reference symbol part, can partly join together to constitute a complete reference symbol to this time slot rear end reference symbol part and front end reference symbol, do the average channel estimation of channel estimating then as this time slot data division.But not the channel estimating of employed extrapolation mode in the prior art has solved the problem one that the prior art frame structure exists.Also improved simultaneously the channel estimation problems that can't receive under the next time slot reference symbol situation, i.e. the problem four of prior art frame structure existence.
The present invention has been distributed to the two ends of time slot by a complete reference symbol, therefore Cyclic Prefix (CP) and reference symbol basic code (PA Code) is recycled part, can appear at the adjacent two ends of this time slot data division, solve the problem two that the prior art frame structure exists.
In addition, the reference symbol that distributes at the time slot two ends allows receiver under the situation that does not receive next time slot reference symbol, just carries out channel estimating, and can guarantee certain performance.With respect to the end point of a time slot, even receive the whole reference symbol of next time slot front end, the time started of carrying out this reference mark channel estimation makes moderate progress the problem three of its existence also early than existing frame structure.
By method and apparatus of the present invention, the frame structure that is suitable for broadcasting services such as mobile TV can be provided in communication system, and provide corresponding receiving equipment, method is simple, be easy to realize, keeping farthest improving receptivity under the constant situation of spectrum efficiency, reduced the implementation complexity of terminal.
Description of drawings
Fig. 1 is the rough schematic of typical cell mobile communication systems.
Fig. 2 is the schematic diagram of TD-SCDMA frame structure in the prior art.
Fig. 3 is the frame structure schematic diagram that is used for the TD-SCDMA special carrier in the prior art.
Fig. 4 is the frame structure schematic diagram that the present invention is used for TD-SCDMA.
Fig. 5 is the method flow diagram that receives an embodiment of wireless signal with frame structure form shown in Figure 4 of the present invention.
Fig. 6 is the receiving system schematic diagram of Fig. 5 embodiment correspondence.
Fig. 7 is the memory module among Fig. 6 embodiment and the schematic diagram of interpolating module.
Fig. 8 is the method flow diagram that receives another embodiment of wireless signal with frame structure form shown in Figure 4 of the present invention.
Fig. 9 is the receiving system schematic diagram of Fig. 8 embodiment correspondence.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
Embodiments of the invention are that example is come descriptor frame structure and method of reseptance and device with the TD-SCDMA system all, those skilled in the art as can be known, the TD-SCDMA here only is an example, and frame structure of the present invention and method of reseptance thereof and device extend to any communication system.
Fig. 4 shows the frame structure of the TD-SCDMA of being used for of the present invention.See also Fig. 4, with time slot 403 is example, time slot 403 is divided into leading reference symbol part (PreAmble) and data division (Data Part) 408, and leading reference symbol part (PreAmble) is made of 417 and reference symbol basic codes of a Cyclic Prefix (CP) (PA Code).In the present invention, reference symbol basic code (PA Code) is divided into the first reference symbol basic code (PA Code Part A) the 418 and second reference symbol basic code (PA Code PartB) 415.Wherein the second reference symbol basic code (PA Code Part B) 415 is as preceding reference symbol part, be placed on the front end of time slot 403, the Cyclic Prefix (CP) 417 and the first reference symbol basic code (PA CodePart A) 418 constitutes back reference symbol part 412, is distributed in the rear end of time slot 403.Reference symbol part and back reference symbol part 412 were middle before data division 408 was clipped in.
The back reference symbol part 411 of last time slot 402 and the preceding reference symbol part 415 of this time slot 403 just constitute a complete reference symbol.Similarly, the preceding reference symbol part 419 of back reference symbol part 412 of this time slot 403 and back one time slot 404 just constitutes a complete reference symbol.The preceding reference symbol part 415 of this time slot 403 is connected back reference symbol part 412 back of this time slot, constitutes a complete reference symbol.
For each time slot, the length of its preceding reference symbol part (PA Code Part B) is greater than the length of Cyclic Prefix in this time slot (CP).Reference symbol basic code sequence comprises the TD-SCDMA system
Step S16: utilize the channel estimation results of the data division of current time slots i, the value of demodulation current time slots i data division.
Should be understood that above-mentioned steps circulation carries out.
Based on above-mentioned frame method of reseptance, the invention allows for a kind of frame receiving system.Fig. 6 shows an embodiment of device, sees also Fig. 6, and device 20 comprises: radio-frequency module 21, channel estimation module 22, memory module 23, interpolating module 24, selection module 25 and data demodulation module 26.
Radio-frequency module 21 receives wireless signal, exports baseband signal after radio frequency processing.Frame structure embodiment as shown in Figure 4 is identical, does not repeat them here.Channel estimation module 22 comprises frequency shift (FS) alignment unit (not shown) and channel estimation process unit (not shown), and frequency shift (FS) alignment unit receiving baseband signal carries out the frequency shift (FS) calibration to current time slots i.A judgement at first can be done in the channel estimation process unit, judges whether to exist the channel estimation results of the complete reference symbol in last time slot i-1 data division rear end and the preceding reference symbol part that whether has received a back time slot i+1.If have the channel estimation results of the complete reference symbol in last time slot i-1 data division rear end and the preceding reference symbol part that has received a back time slot i+1, then do channel estimating one time at the complete reference symbol of current time slots i data division rear end, the output estimated value is to interpolating module 24.The channel estimating event memory of the reference symbol that if there is no last time slot i-1 data division rear end is complete and/or do not receive the back one time slot i+1 preceding reference symbol part, then the back reference symbol of current time slots i rear end partly is placed on before the preceding reference section of current time slots front end, connect into complete reference symbol and carry out channel estimating, export to as the second channel estimated result and select module 25.
Interpolating module 24 receives the channel estimation value of last time slot i-1 from memory module 23, receive first channel estimation results of current time slots i from the channel estimation process unit of channel estimation module 22, obtains first channel estimation results behind the interpolation arithmetic.
When the channel estimating event memory that has the complete reference symbol in last time slot i-1 data division rear end and when having received the preceding reference symbol part of a back time slot i+1, select module 25 to select first channel estimation results of this interpolating module output, as the channel estimation results output of current time slots data division; When the channel estimating event memory that does not have the complete reference symbol in last time slot i-1 data division rear end and/or when not receiving the preceding reference symbol part of back one time slot i+1, select module 25 directly with the channel estimation results output of the second channel estimated result of this channel estimation module output as the current time slots data division.
It (is the PN sequences such as middle guiding code sequence, Zadoff-Chu sequence and M sequence that the channel of current time slots i data division is estimated that memory module 23 receives the output valve of selecting modules 25.Preferably, the equal in length of preceding reference symbol part in the same time slot and back reference symbol part.That is, for example in time slot 403, the preceding reference symbol part (i.e. the second reference symbol basic code 415) and the back equal in length of reference symbol part 412.
According to above-mentioned frame structure, the present invention proposes a kind of method of reseptance to this frame.Fig. 5 shows the flow process of method of reseptance, sees also Fig. 5, is the detailed description to each step in this method flow below.
Step S10: receive wireless signal, obtain baseband signal after the radio frequency processing.
This frame structure sees also the foregoing description, does not repeat them here.
Step S11: current time slots i is carried out the frequency shift (FS) calibration, and wherein i represents the numbering of time slot, is natural number.
Step S12: judge whether to exist the channel estimating event memory of the complete reference symbol in last time slot i-1 data division rear end, and the preceding reference symbol part that whether has received a back time slot i+1.If exist the channel estimating event memory of the complete reference symbol in last time slot i-1 data division rear end also to receive the preceding reference symbol part of back one time slot i+1 simultaneously, then enter step S13, otherwise enter step S14.
Step S13: the complete reference symbol at current time slots i data division rear end is done channel estimating one time, and the channel estimation results that channel estimation results and the complete reference symbol in last time slot i-1 rear end of having stored are carried out carried out interpolation arithmetic, obtain the channel estimation results of the data division of current time slots i.
For example, complete reference symbol (combination of the preceding reference symbol part 419 of back reference symbol part 412 and time slot 404) at current time slots 403 data division rear ends is done channel estimating one time, the channel estimation results of the reference symbol (combination of the back reference symbol part 411 of time slot 402 and the preceding reference symbol part 415 of time slot 403) that this channel estimation results and last time slot 402 rear ends of having stored are complete carries out interpolation arithmetic, obtains the channel estimation results of the data division of current time slots 403.
Step S14: the back reference symbol of current time slots i rear end partly is placed on before the preceding reference symbol part of current time slots front end, connects into complete reference symbol and carry out channel estimating, obtain the channel estimation results of current time slots i data division.
For example, before the reference symbol part 415, connect into complete reference symbol and carry out channel estimating, before the back reference symbol part 412 of current time slots 403 is placed on directly with the channel estimation results of channel estimation results as current time slots 403 data divisions.
Step S15: the channel estimation results of storage current time slots i data division.The meter result), the channel estimation results of exporting last time slot i-1 data division is to interpolating module 24.
Data demodulation module 26 receives the channel estimation results of the current time slots i data division of selecting module 25 outputs, the value of demodulation current time slots data division, and demodulated output data is for subsequent treatment.
Please continue referring to Fig. 7, memory module 23 is made up of the d type flip flop chain, channel estimation results according to time delay sequential storage/output time solt, be input as by this time slot channel estimation results of selecting module 25 to obtain, be output as the last time slot channel estimation results according to the output of time delay order of storage according to the output of time delay order.
Interpolating module 24 is an adder, be input as by channel estimation module 22 and obtain, be output as the channel parameter after the interpolation according to this time slot channel estimation results of time delay order output and the last time slot channel estimation results according to the output of time delay order of memory module 23 storages.
According to above-mentioned frame structure, the present invention proposes another kind of method of reseptance to this frame.Fig. 8 shows the flow process of method of reseptance, sees also Fig. 8, is the detailed description to each step in this method flow below.
Step S20: receive wireless signal, obtain baseband signal after the radio frequency processing.
This frame structure sees also the foregoing description, does not repeat them here.
Step S21: current time slots i is carried out the frequency shift (FS) calibration, and wherein i represents the numbering of time slot, is natural number.
Step S22: judge whether to exist last time slot i-1 data division rear end the complete reference symbol channel estimation results and whether receive the preceding reference symbol part of back one time slot i+1.Result according to these two Rule of judgment is divided into 4 kinds of situations: forward step S23 (the last Rule of judgment of (being to be) expression is a "Yes", and back one judges that bar is a "No", below similar) when (being to be) in the result; Forward step S26 when in the result being (not, not) to; Be (to be to forward step S24 in the time of not) in the result; Forward step S25 when in the result being (, not being) to.
Step S23: the complete reference symbol behind the current time slots i data division is carried out channel estimating, channel estimation results with obtaining current time slots i data division after the complete reference mark channel estimated result interpolation behind the last time slot i-1 data division of having stored goes to step S27.
Step S24: current time slots i reference symbol is partly connected into complete reference symbol and makes channel estimating, obtain the channel estimation results of current time slots i data division, go to step S27.
Step S25: current time slots i reference symbol is partly connected into complete reference symbol and makes channel estimating, channel estimation results with obtaining current time slots i data division after the channel estimation results interpolation of the last time slot i-1 data division rear end complete reference symbol of having stored goes to step S27.
Step S26: current time slots i reference symbol is partly connected into complete reference symbol and makes channel estimating, obtain the channel estimation results of current time slots i data division with the channel estimation results interpolation of current time slots i data division rear end complete reference symbol, go to step S27.
Step S27: the channel estimation results of storage current time slots i data division.
Step S28: utilize the channel estimation results of current time slots i data division, the value of demodulation current time slots i data division.
Based on the method for the foregoing description, the present invention has also disclosed corresponding frame receiving system, and principle of device sees also Fig. 9.Device 30 comprises: radio-frequency module 31, channel estimation module 32, memory module 33, interpolating module 34, selection module 35 and data demodulation module 36.
Radio-frequency module 31 receives wireless signal, exports baseband signal after radio frequency processing.Frame structure embodiment as shown in Figure 4 is identical, does not repeat them here.Channel estimation module 32 comprises frequency shift (FS) alignment unit (not shown) and channel estimation process unit (not shown), and wherein the frequency shift (FS) alignment unit receives baseband channel, and time slot is carried out the frequency shift (FS) calibration.
The channel estimation process unit comprises the first channel estimation process unit (not shown) and second channel estimation processing unit (not shown), wherein the first channel estimation process unit partly is placed on the back reference symbol of current time slots i rear end before the preceding reference symbol part of current time slots i front end, carries out channel estimating to connect into complete reference symbol.Second channel estimates that the complete reference symbol after processing unit is with current time slots i data division carries out channel estimating.
Interpolating module 34 connects the first channel estimation process unit and second channel is estimated processing unit.Can be divided into three kinds of situations handles: first kind of situation is at the channel estimation results that has last time slot i-1 data division rear end complete reference symbol and do not receive under the preceding reference symbol situation partly of back one time slot i+1, receive the channel estimation results of the first channel estimation process unit, complete reference mark channel estimated result in conjunction with behind the last time slot i-1 data division of memory module 33 outputs carries out exporting as first channel estimation results behind the interpolation arithmetic.Second kind of situation is at the channel estimation results that has last time slot i-1 data division rear end complete reference symbol and receives under the preceding reference symbol situation partly of back one time slot i+1, receive second channel and estimate the channel estimation results of processing unit, complete reference mark channel estimated result in conjunction with behind the last time slot i-1 data division of memory module 33 outputs carries out exporting as the second channel estimated result behind the interpolation arithmetic.The third situation is at the channel estimation results that does not have last time slot i-1 data division rear end complete reference symbol and receives under the situation of preceding reference symbol of back one time slot i+1, receive the first channel estimation process unit and second channel and estimate the channel estimation results of processing unit, carry out exporting as the 3rd channel estimation results behind the interpolation arithmetic.
Select module 35 to connect the interpolating module 34 and the first channel estimation process unit.Select module 35 to be one four and select one selector.First channel estimation results of interpolating module 34 is imported as first, the second channel estimated result of interpolating module 34 is as second input, the 3rd channel estimation results of interpolating module 34 is as the 3rd input, and the output valve of the first channel estimation process unit is as the 4th input.Not only having the channel estimation results of last time slot i-1 data division rear end complete reference symbol but also do not receive under the preceding reference symbol situation partly of back one time slot i+1, with the channel estimation results output of first input as current time slots i data division.Not only having the channel estimation results of last time slot i-1 data division rear end complete reference symbol but also receive under the preceding reference symbol situation partly of back one time slot i+1, with the channel estimation results output of second input as current time slots i data division.Receive again at the channel estimation results that neither has last time slot i-1 data division rear end complete reference symbol under the preceding reference symbol situation partly of back one time slot i+1, with the channel estimation results output of the 3rd input as current time slots i data division.Do not receive again at the channel estimation results that neither has last time slot i-1 data division rear end complete reference symbol under the preceding reference symbol situation partly of back one time slot i+1, with the channel estimation results output of the 4th input as current time slots i data division.
Memory module 33 is received the output valve (being the channel estimation results of current time slots i data division) of selecting module 35, and the channel estimation results of exporting last time slot i-1 data division is to interpolating module 34.
Data demodulation module 36 receives the channel estimation results of the current time slots i data division of selecting module 35 outputs, the value of demodulation current time slots data division, and demodulated output data is for subsequent treatment.
The principle of memory module 33 and interpolating module 34 is identical with Fig. 7 embodiment, does not repeat them here.
The foregoing description provides to those of ordinary skills and realizes or use of the present invention; those of ordinary skills can be under the situation that does not break away from invention thought of the present invention; the foregoing description is made various modifications or variation; thereby protection scope of the present invention do not limit by the foregoing description, and should be the maximum magnitude that meets the inventive features that claims mention.

Claims (20)

1. the frame method of reseptance in the communication system comprises:
Receive wireless signal, obtain baseband signal after the radio frequency processing, the structure of time slot of frame structure is made of leading reference symbol part and data division, this leading reference symbol is made of a Cyclic Prefix and a reference symbol basic code, this reference symbol basic code is divided into the first reference symbol basic code and the second reference symbol basic code, wherein this second partly is distributed in the time slot front end with reference to basic code as preceding reference symbol, this Cyclic Prefix and this first reference symbol basic code are formed the back reference symbol and partly are distributed in the time slot rear end, and this data division is clipped between this preceding reference symbol part and this back reference symbol part;
Current time slots is carried out the frequency shift (FS) calibration;
Judge whether to exist the channel estimating event memory of the complete reference symbol in last time slot data division rear end and the preceding reference symbol part that has received a back time slot;
If have the channel estimating event memory of the complete reference symbol in last time slot data division rear end and the preceding reference symbol part that has received a back time slot, then do channel estimating one time, and the channel estimation results that the result of this channel estimating and the complete reference symbol in last time slot rear end of having stored are carried out is carried out obtaining behind the interpolation arithmetic channel estimation results of the data division of current time slots at the complete reference symbol of current time slots data division rear end;
The channel estimation results of the reference symbol that if there is no last time slot data division rear end is complete, and/or do not receive the back one time slot preceding reference symbol part, then the back reference symbol of current time slots rear end partly is placed on before the preceding reference symbol part of current time slots front end, carry out channel estimating to connect into complete reference symbol, with the result of this channel estimating channel estimation results as the current time slots data division;
This channel estimation results of storage current time slots data division;
Utilize this channel estimation results of the data division of current time slots, the value of demodulation current time slots data division.
2. the frame method of reseptance in the communication system according to claim 1 is characterized in that, the preceding reference symbol part of each time slot partly constitutes a complete reference symbol with the back reference symbol of last time slot; The back reference symbol part of each time slot partly constitutes a complete reference symbol with the preceding reference symbol of back one time slot; The preceding reference symbol of each time slot constitutes a complete reference symbol after partly moving the back reference symbol part back and connection of this time slot.
3. the frame method of reseptance in the communication system according to claim 2 is characterized in that, the length of the preceding reference symbol part of each time slot is greater than the length of this time slot Cyclic Prefix.
4. the frame method of reseptance in the communication system according to claim 3 is characterized in that, the equal in length of this preceding reference symbol part and this back reference symbol part.
5. according to the frame method of reseptance in claim 3 or the 4 described communication systems, it is characterized in that this reference symbol basic code sequence comprises middle guiding code sequence, Zadoff-Chu sequence, the M sequence of communication system.
6. the frame receiving system in the communication system, this device comprises radio-frequency module, channel estimation module, interpolating module, selection module, memory module and data demodulation module, wherein:
Radio-frequency module, receive wireless signal, obtain baseband signal after the radio frequency processing, the structure of time slot of frame structure is made of leading reference symbol part and data division, this leading reference symbol is made of a Cyclic Prefix and a reference symbol basic code, this reference symbol basic code is divided into the first reference symbol basic code and the second reference symbol basic code, wherein this second partly is distributed in the time slot front end with reference to basic code as preceding reference symbol, this Cyclic Prefix and this first reference symbol basic code are formed the back reference symbol and partly are distributed in the time slot rear end, and this data division is clipped between this preceding reference symbol part and this back reference symbol part;
Channel estimation module comprises frequency shift (FS) alignment unit and channel estimation process unit, wherein:
The frequency shift (FS) alignment unit, receiving baseband signal carries out the frequency shift (FS) calibration to time slot;
The channel estimation process unit, if have the channel estimating event memory of the complete reference symbol in last time slot data division rear end and the preceding reference symbol part that has received a back time slot, then do channel estimating one time at the complete reference symbol of current time slots data division rear end, export first channel estimation results, the channel estimation results of the reference symbol that if there is no last time slot data division rear end is complete and/or do not receive the back one time slot preceding reference symbol part, then the back reference symbol of current time slots rear end partly is placed on before the preceding reference symbol part of current time slots front end, carry out channel estimating to connect into complete reference symbol, output second channel estimated result;
Interpolating module, first channel estimation results of reception current time slots from this channel estimation process unit in conjunction with the channel estimation results of last time slot, obtains first channel estimation results of current time slots data division behind interpolation arithmetic;
Select module, if have the channel estimating of the complete reference symbol in last time slot data division rear end and the preceding reference symbol part that has received a back time slot, then receive this first channel estimation results from this interpolating module, channel estimation results output as the current time slots data division, the channel estimating event memory of the reference symbol that if there is no last time slot data division rear end is complete and/or do not receive the back one time slot preceding reference symbol part, then from this channel estimation process unit, receive this second channel estimated result, export behind the channel estimation results as the current time slots data division;
Memory module receives the output valve of this selection module, and the channel estimation results of exporting last time slot data division is to this interpolating module;
Data demodulation module receives the channel estimation results of the current time slots data division of this selection module output, the value of demodulation current time slots data division.
7. the frame receiving system in the communication system according to claim 6 is characterized in that, the preceding reference symbol part of each time slot partly constitutes a complete reference symbol with the back reference symbol of last time slot; The back reference symbol part of each time slot partly constitutes a complete reference symbol with the preceding reference symbol of back one time slot; The preceding reference symbol of each time slot constitutes a complete reference symbol after partly moving the back reference symbol part back and connection of this time slot.
8. the frame receiving system in the communication system according to claim 7 is characterized in that, the length of the preceding reference symbol part of each time slot is greater than the length of this time slot Cyclic Prefix.
9. the frame receiving system in the communication system according to claim 8 is characterized in that, the equal in length of this preceding reference symbol part and this back reference symbol part.
10. according to Claim 8 or the frame receiving system in the 9 described communication systems, it is characterized in that this reference symbol basic code sequence comprises middle guiding code sequence, Zadoff-Chu sequence, the M sequence of communication system.
11. the frame method of reseptance in the communication system comprises:
Receive wireless signal, obtain baseband signal after the radio frequency processing, the structure of time slot of frame structure is made of leading reference symbol part and data division, this leading reference symbol is made of a Cyclic Prefix and a reference symbol basic code, this reference symbol basic code is divided into the first reference symbol basic code and the second reference symbol basic code, wherein this second partly is distributed in the time slot front end with reference to basic code as preceding reference symbol, this Cyclic Prefix and this first reference symbol basic code are formed the back reference symbol and partly are distributed in the time slot rear end, and this data division is clipped between this preceding reference symbol part and this back reference symbol part;
Current time slots is carried out the frequency shift (FS) calibration;
If both there had been the channel estimation results of the complete reference symbol in last time slot data division rear end, receive the preceding reference symbol part of back one time slot again, then the complete reference symbol of current time slots data division rear end is carried out channel estimating, and with the channel estimation results interpolation of the complete reference symbol of last time slot data back-end after obtain the channel estimation results of current time slots data division;
If neither there is the channel estimation results of the complete reference symbol in last time slot data division rear end, do not receive the preceding reference symbol part of back one time slot again, then the back reference symbol of current time slots rear end partly is placed on before the preceding reference symbol part of current time slots front end, carry out channel estimating to connect into complete reference symbol, obtain the channel estimation results of current time slots data division;
If there is the channel estimation results of the complete reference symbol in last time slot data division rear end, but do not receive the preceding reference symbol part of back one time slot, then the back reference symbol of current time slots rear end partly is placed on before the preceding reference symbol part of current time slots front end, carry out channel estimating to connect into complete reference symbol, the channel estimation results of the reference symbol that channel estimation results and last time slot rear end is complete obtains the channel estimation results of current time slots data division behind interpolation arithmetic;
The channel estimation results of the reference symbol that if there is no last time slot data division rear end is complete, but receive the preceding reference symbol part of back one time slot, then the back reference symbol of current time slots rear end partly is placed on before the preceding reference symbol part of current time slots front end, carry out channel estimating to connect into complete reference symbol, and the reference symbol that current time slots data division rear end is complete carries out channel estimating, then these two channel estimation results done the channel estimation results that obtains the current time slots data division behind the interpolation arithmetic;
The channel estimation results of storage current time slots data division;
Utilize this channel estimation results of the data division of current time slots, the value of demodulation current time slots data division.
12. the frame method of reseptance in the communication system according to claim 11 is characterized in that, the preceding reference symbol part of each time slot partly constitutes a complete reference symbol with the back reference symbol of last time slot; The back reference symbol part of each time slot partly constitutes a complete reference symbol with the preceding reference symbol of back one time slot; The preceding reference symbol of each time slot constitutes a complete reference symbol after partly moving the back reference symbol part back and connection of this time slot.
13. the frame method of reseptance in the communication system according to claim 12 is characterized in that, the length of the preceding reference symbol part of each time slot is greater than the length of this time slot Cyclic Prefix.
14. the frame method of reseptance in the communication system according to claim 13 is characterized in that, the equal in length of this preceding reference symbol part and this back reference symbol part.
15. the frame method of reseptance according in claim 13 or the 14 described communication systems is characterized in that, this reference symbol basic code sequence comprises middle guiding code sequence, Zadoff-Chu sequence, the M sequence of communication system.
16. the frame receiving system in the communication system comprises radio-frequency module, channel estimation module, interpolating module, selection module, memory module and data demodulation module, wherein:
Radio-frequency module, receive wireless signal, obtain baseband signal after the radio frequency processing, the structure of time slot of this frame structure is made of leading reference symbol part and data division, this leading reference symbol is made of a Cyclic Prefix and a reference symbol basic code, this reference symbol basic code is divided into the first reference symbol basic code and the second reference symbol basic code, wherein this second partly is distributed in the time slot front end with reference to basic code as preceding reference symbol, this Cyclic Prefix and this first reference symbol basic code are formed the back reference symbol and partly are distributed in the time slot rear end, and this data division is clipped between this preceding reference symbol part and this back reference symbol part;
Channel estimation module comprises frequency shift (FS) alignment unit and channel estimation process unit, wherein:
The frequency shift (FS) alignment unit, receiving baseband signal carries out the frequency shift (FS) calibration to time slot;
The channel estimation process unit comprises the first channel estimation process unit and second channel estimation processing unit, wherein:
The first channel estimation process unit partly is placed on the back reference symbol of current time slots rear end before the preceding reference symbol part of current time slots front end, carries out channel estimating to connect into complete reference symbol;
Second channel is estimated processing unit, and the complete reference symbol behind the current time slots data division is carried out channel estimating;
Interpolating module, connect this first channel estimation process unit and this second channel estimation processing unit, at the channel estimation results that has last time slot data division rear end complete reference symbol and do not receive under the situation of preceding reference symbol part of back one time slot, receive the channel estimation results of this first channel estimation process unit, in conjunction with the complete reference mark channel estimated result behind the last time slot data division, carry out exporting as first channel estimation results behind the interpolation arithmetic; At the channel estimation results that has last time slot data division rear end complete reference symbol and receive under the situation of preceding reference symbol part of back one time slot, receive this second channel and estimate the channel estimation results of processing unit, in conjunction with the complete reference mark channel estimated result behind the last time slot data division, carry out exporting as the second channel estimated result behind the interpolation arithmetic; At the channel estimation results that does not have last time slot data division rear end complete reference symbol and receive under the situation of preceding reference symbol part of back one time slot, receive this first channel estimation process unit and this second channel and estimate the channel estimation results of processing unit, carry out exporting as the 3rd channel estimation results behind the interpolation arithmetic;
Select module, not only there is the channel estimation results of last time slot data division rear end complete reference symbol but also do not receive under the preceding reference symbol situation partly of back one time slot, select this first channel estimation results of this interpolating module, as the channel estimation results output of current time slots data division; Not only there is the channel estimation results of last time slot data division rear end complete reference symbol but also receive under the preceding reference symbol situation partly of back one time slot, receive this second channel estimated result of this interpolating module, as the channel estimation results output of current time slots data division; Receive again at the channel estimation results that neither has last time slot data division rear end complete reference symbol under the preceding reference symbol situation partly of back one time slot, receive the 3rd channel estimation results of this interpolating module, as the channel estimation results output of current time slots data division; Do not receive again at the channel estimation results that neither has last time slot data division rear end complete reference symbol under the preceding reference symbol situation partly of back one time slot, receive the output valve of this first channel estimation process unit of this channel estimation module, as the channel estimation results output of current time slots data division;
Memory module receives the output valve of this selection module, and the channel estimation results of exporting last time slot data division is to this interpolating module;
Data demodulation module receives the channel estimation results of the current time slots data division of this selection module output, the value of demodulation current time slots data division.
17. the frame receiving system in the communication system according to claim 16 is characterized in that, the preceding reference symbol part of each time slot partly constitutes a complete reference symbol with the back reference symbol of last time slot; The back reference symbol part of each time slot partly constitutes a complete reference symbol with the preceding reference symbol of back one time slot; The preceding reference symbol of each time slot constitutes a complete reference symbol after partly moving the back reference symbol part back and connection of this time slot.
18. the frame receiving system in the communication system according to claim 17 is characterized in that, the length of the preceding reference symbol part of each time slot is greater than the length of this time slot Cyclic Prefix.
19. the frame receiving system in the communication system according to claim 18 is characterized in that, the equal in length of this preceding reference symbol part and this back reference symbol part.
20. the frame receiving system according in claim 18 or the 19 described communication systems is characterized in that, this reference symbol basic code sequence comprises middle guiding code sequence, Zadoff-Chu sequence, the M sequence of communication system.
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