CN101001234A - Method for sending signal by orthogonal frequency division multiplex system and method of cell search - Google Patents
Method for sending signal by orthogonal frequency division multiplex system and method of cell search Download PDFInfo
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- CN101001234A CN101001234A CN 200610011145 CN200610011145A CN101001234A CN 101001234 A CN101001234 A CN 101001234A CN 200610011145 CN200610011145 CN 200610011145 CN 200610011145 A CN200610011145 A CN 200610011145A CN 101001234 A CN101001234 A CN 101001234A
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Abstract
This invention discloses a method for transmitting signal by an emission end of an OFDM system and a search method of local areas by mobile terminals, in which, the emission end transmits local area ID signal on a last OFDM symbol of the sub-frame and the mobile station realizes the area search by synchronization of sub-frames, area identification and synchronization of OFDM, which sets local area ID signals on the last OFDM symbol and transmits it, and sends the system information at the position closing to the pilot symbol on the sub-frame with fixed circular prefix, so that, mobile terminals can finish the search without testing circular prefix.
Description
Technical field
The present invention relates to digital communicating field, particularly relate to a kind of based on OFDM (OrthogonalFrequency Division Multiplex, OFDM) transmitting terminal of technology sends the method for signal, and the method for corresponding mobile you Cell searching.
Background technology
As a kind of multi-carrier transmission pattern, OFDM is converted to one group of low-speed parallel data flow transmitted by the data flow with a high-speed transfer, system is reduced greatly to the susceptibility of multidiameter fading channel frequency selectivity, and the introducing of Cyclic Prefix, further strengthened the anti-intersymbol interference (Inter-symbolInterference of system again, ISI) ability, in addition bandwidth availability ratio height, realize that characteristics such as simple make OFDM more and more wider in the application in radio communication basin, such as, wlan system all is based on the system of OFDM technology based on WiMax system of orthogonal frequency division multiplexing multiple access etc.
" 3GPP; TR25.814 " Physical Layer Aspects for Evolved UTRA (release7) " has provided the various technical schemes of Long Term Evolution (LTE) after the W-CDMA; wherein also is the most noticeable scheme based on the downlink scenario of OFDM technology.
For general ofdm system, each OFDM symbol all comprises two parts: Cyclic Prefix and useful symbolic component, wherein, the repetition of the normally useful symbolic component of Cyclic Prefix part back one piece of data.In order to be applied to different channel circumstances, a plurality of options are all arranged usually based on the circulating prefix-length of the communication system of OFDM technology.Such as in the LTE system that adopts the OFDM technology, for the application scenarios that super covering far away or multicast, broadcast message transmit, system can select the symbol of long loop prefix for use; For general application, system can select the symbol of short Cyclic Prefix for use.
When the initial connecting system of travelling carriage, at first will to obtain sequential synchronous with the signal of some sub-districts in the system, it is this that to relate to the synchronous process of sequential from nothing be exactly the cell search process of travelling carriage.But the diversity of circulating prefix-length has brought very burden for the Cell searching of travelling carriage: travelling carriage does not also have and get in touch in the sub-district, can not know the circulating prefix-length that the sub-district is selected for use naturally.And according to existing technical scheme, travelling carriage must be known the circulating prefix-length that the sub-district is selected for use earlier, just might correctly receive the information that the sub-district sends.
How tackling the influence that the diversity of circulating prefix-length causes to Cell searching is a challenging problem, a universal scheme is that travelling carriage is attempted the circulating prefix-length that all sub-districts may be adopted, and determines the circulating prefix-length that adopt the sub-district according to certain principle.But the circulating prefix-length of cell selecting changes along with the application scenarios difference, adopts this method can significantly increase the Cell searching time and the implementation complexity of travelling carriage, can't satisfy the requirement of contemporary communication system.
Summary of the invention
Be diversity, the realization complicated problems long that solves existing circulating prefix-length to the time that Cell searching brings, the object of the present invention is to provide a kind of ofdm system transmitting terminal subframe processing method and small region search method, make Cell searching realize lacking simple, search time.
To achieve these goals, the invention provides the method that a kind of ofdm system transmitting terminal sends signal, transmitting terminal sends the cell ID signal on last OFDM symbol of one or more subframes.
Above-mentioned ofdm system transmitting terminal sends the method for signal, wherein, and the position transmitting system information of close frequency pilot sign in subframe.
Above-mentioned ofdm system transmitting terminal sends the method for signal, and wherein, described system information is identical or adjacent with frequency pilot sign residing symbol in subframe.
Above-mentioned ofdm system transmitting terminal sends the method for signal, wherein, and transmitting system information on the subframe that the fixed cycles prefix is arranged.
Above-mentioned ofdm system transmitting terminal sends the method for signal, wherein, sends the cell ID signal on the subframe that the fixed cycles prefix is arranged.
In order better to realize above-mentioned purpose, the present invention also provides the small region search method of mobile you in a kind of ofdm system, wherein, comprises the steps:
The synchronizing sub-frame step from receiving the extracting data sub-frame sync signal, obtains synchronizing sub-frame or frame synchronization;
Cell identification signal extraction and optimum subdistrict identification step, utilize synchronizing sub-frame information, extract the useful symbolic component of each last OFDM symbol of subframe, carry out discrete Fourier transform (DFT), extracting data after the conversion goes out to be used to indicate the cell ID signal of sub-district, and utilize the cell ID signal and the local reference signal of the sign sub-district of extracting to mate, obtain the cell ID signal that optimum subdistrict adopts;
System information demodulation and OFDM symbol synchronizing step, travelling carriage extraction system information obtains symbol regularly by demodulating system message, finishes Cell searching, and described system information is positioned on the position of close frequency pilot sign of subframe of fixed cycles prefix.
The small region search method of mobile you in the above-mentioned ofdm system, wherein for the coherent demodulation system, described cell identification step comprises that also utilizing cell ID signal and local reference signal coupling to obtain optimum subdistrict adopts pilot signal; Described OFDM symbol synchronizing step comprises that also travelling carriage extracts the pilot signal of optimum subdistrict.
Ofdm system transmitting terminal subframe processing method of the present invention and small region search method, by sending on last OFDM symbol that the cell ID signal is arranged on subframe, the position transmitting system information of close frequency pilot sign in subframe, and transmitting system information on the subframe that the fixed cycles prefix is arranged, mobile you need not detect circulating prefix-length and just finish Cell searching, realize that simply, the Cell searching time is short.
Description of drawings
Fig. 1 is the OFDM schematic symbol diagram;
Fig. 2 (a) and Fig. 2 (b) are respectively the subframe schematic diagram of different circulating prefix-lengths;
Fig. 3 is the schematic flow sheet of small region search method of the present invention.
Embodiment
In ofdm system, a frame is divided into several subframes, and the length of subframe is a prior determined value, because the difference of application scenarios, a kind of circulating prefix-length is selected for each subframe by system from multiple circulating prefix-length.
Fig. 1 is the OFDM schematic symbol diagram, and the part of filling left oblique line among Fig. 1 in the rectangle frame is the Cyclic Prefix of OFDM symbol.That does not fill content in the rectangle frame is the useful symbolic component of OFDM symbol, the repetition of the normally useful symbolic component of Cyclic Prefix part back one piece of data.At receiver end, during receiver demodulating ofdm signal, the content of Cyclic Prefix part all can be received machine usually and abandon, and therefore, before demodulation, receiver must obtain the position of the useful symbolic component of OFDM symbol in advance.
Because the difference of application scenarios, a kind of circulating prefix-length is selected for each subframe by system from multiple circulating prefix-length, and Fig. 2 (a) and Fig. 2 (b) are respectively the subframe schematic diagram of different circulating prefix-lengths, and the length of subframe is an individual determined value as can be seen from Figure.
Fig. 2 (a) sign be a subframe that adopts long loop prefix, wherein, the part of filling left oblique line in the rectangle frame is the Cyclic Prefix of OFDM symbol, that does not fill content in the rectangle frame is the useful symbolic component of OFDM symbol; Fig. 2 (b) sign be a subframe that adopts short Cyclic Prefix, wherein, the part of filling right oblique line in the rectangle frame is the Cyclic Prefix of OFDM symbol, that does not fill content in the rectangle frame is the useful symbolic component of OFDM symbol.
Shown in Fig. 2 (a) and Fig. 2 (b),, in the subframe of the short Cyclic Prefix of employing 7 OFDM symbols are arranged because the difference of circulating prefix-length has 6 OFDM symbols in the subframe of employing long loop prefix.LTE system based on the OFDM technology has just adopted and Fig. 2 (a) and the similar frame structure of Fig. 2 (b).For the application scenarios that super covering far away or multicast, broadcast message transmit, system can select the subframe of long loop prefix for use, and at this moment, each subframe has 6 symbols, can reduce the received signal intersymbol interference; For general application, system can select the subframe of short Cyclic Prefix for use, and at this moment, each subframe has 7 symbols, can improve the throughput of system.
Shown in Fig. 2 (a) and Fig. 2 (b), no matter how many circulating prefix-lengths that subframe adopts is, the useful symbolic component of last symbol of subframe aligns in time, this explanation, last symbol of each subframe of demodulation as long as obtain synchronizing sub-frame, does not need to determine the circulating prefix-length of this symbol, and synchronizing sub-frame can realize by sending a sub-frame sync signal at transmitting terminal, belongs to very mature technique.
Therefore, ofdm system transmitting terminal of the present invention sends the method for signal, at transmitting terminal, all include one or more subframe (perhaps frame) synchronizing signal in every frame, according to application scenarios, a kind of circulating prefix-length is selected for each subframe by system from multiple circulating prefix-length, and, all include one or more subframe (perhaps frame) synchronizing signal in every frame; On last OFDM symbol of one or more subframes, send the cell ID signal simultaneously, wherein can on whole carrier waves of this OFDM symbol, send, also can on the part carrier wave, send, the latter, promptly this OFDM symbol can also send other signals except that sending the cell ID signal.
Simultaneously, ofdm system transmitting terminal subframe processing method of the present invention one or more in transmitting terminal can also be in conjunction with following 3 carry out:
1, near the position transmitting system information of frequency pilot sign, this system information comprises the information that is used to indicate the subframe circulating prefix-length, resource allocation information etc.Such as, frequency pilot sign is positioned at first symbol of each subframe, and at this moment, system can be in last symbol transmitting system message of first symbol of certain subframe and/or second symbol and/or subframe; For another example, frequency pilot sign is positioned at second symbol of each subframe, and at this moment, system can be in first symbol and/or second symbol and/or the 3rd symbol transmitting system message of certain subframe; Certainly, frequency pilot sign only just has in the coherent demodulation system, does not have frequency pilot sign in the non-coherent demodulation system.Frequency pilot sign is to divide on the OFDM symbol frequency domain, but the position of close frequency pilot sign can be close on the time domain, also can be close on the frequency domain, perhaps haves both at the same time.Lay special stress on a bit, if system is with last symbol transmitting system message of subframe, mobile you need not detect circulating prefix-length just can extract system information;
2, system's transmitting system information on the subframe of fixed cycles prefix; With the LTE system is example, and two kinds of Cyclic Prefix are arranged, the subframe that has use long loop prefix, the subframe that has is with short Cyclic Prefix.Concrete with short still with long, by the transmitting terminal decision, and travelling carriage how transmitting terminal is selected is ignorant.The fixing implication here is: transmitting terminal is fixing with long loop prefix or short Cyclic Prefix subframe transfer system information, never change, and, transmitting terminal is fixing with the still short Cyclic Prefix subframe transfer system information of long loop prefix, be that transmitting terminal and travelling carriage consult in advance, fixing such as the regulation transmitting terminal with long loop prefix subframe transfer system information.
3, system sends the cell ID signal that is used for identifying cells on the subframe of fixed cycles prefix, the fixing implication in this place with the 2nd in identical.
Among the present invention, in addition in conjunction with above-mentioned first and thirdly the time, mobile you need not detect the identification that circulating prefix-length just can be finished optimum subdistrict at transmitting terminal;
Among the present invention, at transmitting terminal during, even at a high speed in addition in conjunction with above-mentioned first, under the channel condition of high latency expansion, only utilize the frequency pilot sign that system information closes on most just can demodulating system information, both improved the performance of system information demodulation, saved the Cell searching time again;
Among the present invention, during in addition in conjunction with above-mentioned second, need not detect circulating prefix-length just can demodulating system information at transmitting terminal.
Among the present invention, during in addition in conjunction with above-mentioned second, as shown in Figure 3, at mobile you, the cell search process of travelling carriage comprises the steps: at transmitting terminal
The synchronizing sub-frame step, from receiving the extracting data sub-frame sync signal, the acquisition synchronizing sub-frame (or frame synchronization, utilize sub-frame sync signal can obtain synchronizing sub-frame certainly, but in some cases, can also obtain frame synchronization), synchronizing sub-frame belongs to mature technology, does not give unnecessary details at this, and sub-frame sync signal has certain specific character usually: as good time domain autocorrelation, characteristics such as time domain symmetry are very easy to extract;
Cell identification signal extraction and optimum subdistrict identification step, utilize synchronizing sub-frame information, extract the useful symbolic component of each last symbol of subframe, carry out discrete Fourier transform (DFT), can extract the cell ID signal that is used to indicate the sub-district the data after conversion, and utilize the cell ID signal and the local reference signal of the sign sub-district of extracting to mate, obtain the cell ID signal that optimum subdistrict adopts.Extraction above-mentioned, matching process all are mature technologies, do not do at this and give unnecessary details.Correspondingly, if again in conjunction with thirdly above-mentioned, for the coherent demodulation system, travelling carriage is also known the pilot signal that optimum subdistrict adopts;
System information demodulation and OFDM sign synchronization step, because system message is used fixing circulating prefix-length, travelling carriage need not detect circulating prefix-length, just system information can be proposed, correspondingly, if again in conjunction with thirdly above-mentioned, for the coherent demodulation system, can extract the pilot signal of optimum subdistrict, by demodulating system message, travelling carriage can obtain symbol timing accurately, utilizes this symbol regularly (promptly to determine the zero-time of each symbol), broadcast message or other control information of travelling carriage in can any subframe optional sign of demodulation, Cell searching is finished.
If in conjunction with thirdly above-mentioned, for the coherent demodulation system, because system information is on the close position of frequency pilot sign, therefore, only utilize the frequency pilot sign that system information closes on most just can demodulating system information, promptly improved the performance of system information demodulation, saved the Cell searching time again.
For the coherent demodulation system, need know the channel estimating of this information correspondence during the information of demodulation subframe circulating prefix-length in advance, this channel estimating can utilize the pilot signal of the optimum subdistrict of pilot signal that the optimum subdistrict that obtains in the cell identification step adopts and reception to finish, in addition, by demodulating system information, can also obtain frame synchronization, if obtained frame synchronization in the synchronizing sub-frame step, the frame synchronization that this step obtains can be thought the synchronizing sub-frame step is obtained reaffirming of frame synchronization.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (9)
1, a kind of ofdm system transmitting terminal sends the method for signal, it is characterized in that transmitting terminal sends the cell ID signal on last OFDM symbol of subframe.
2, ofdm system transmitting terminal according to claim 1 sends the method for signal, it is characterized in that the position transmitting system information of close frequency pilot sign in subframe.
3, ofdm system transmitting terminal according to claim 2 sends the method for signal, it is characterized in that described system information is identical and/or adjacent with frequency pilot sign residing OFDM symbol in subframe.
4, ofdm system transmitting terminal according to claim 1 and 2 sends the method for signal, it is characterized in that transmitting system information on the subframe that the fixed cycles prefix is arranged.
5, ofdm system transmitting terminal according to claim 1 and 2 sends the method for signal, it is characterized in that, sends the cell ID signal on the subframe that the fixed cycles prefix is arranged.
6, ofdm system transmitting terminal according to claim 5 sends the method for signal, it is characterized in that transmitting system information on the subframe that the fixed cycles prefix is arranged.
7, the small region search method of mobile you in a kind of ofdm system is characterized in that, comprises the steps:
The synchronizing sub-frame step from receiving the extracting data sub-frame sync signal, obtains synchronizing sub-frame or frame synchronization;
Cell identification signal extraction and optimum subdistrict identification step, utilize synchronizing sub-frame information, extract the useful symbolic component of each last OFDM symbol of subframe, carry out discrete Fourier transform (DFT), extracting data after the conversion goes out to be used to indicate the cell ID signal of sub-district, and utilize the cell ID signal and the local reference signal of the sign sub-district of extracting to mate, obtain the cell ID signal that optimum subdistrict adopts;
System information demodulation and OFDM symbol synchronizing step, travelling carriage extraction system information obtains symbol regularly by demodulating system message, finishes Cell searching, and described system information is positioned on the position of close frequency pilot sign of subframe of fixed cycles prefix.
8, the small region search method of mobile you in the ofdm system according to claim 7, it is characterized in that, also comprise frame synchronization affirmation step, further obtain frame synchronization after the demodulating system information, synchronizing sub-frame or frame synchronization that the synchronizing sub-frame step obtains are confirmed.
9, the small region search method of mobile you in the ofdm system according to claim 7, it is characterized in that, for the coherent demodulation system, described cell identification step comprises that also utilizing cell ID signal and local reference signal coupling to obtain optimum subdistrict adopts pilot signal; Described OFDM symbol synchronizing step comprises that also travelling carriage extracts the pilot signal of optimum subdistrict; In addition, also comprise a channel estimation steps, utilize the pilot signal of the optimum subdistrict of pilot signal that the optimum subdistrict that obtains in the cell identification step adopts and reception to finish channel estimating.
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| CN106411445B (en) * | 2015-07-31 | 2019-08-27 | 南京中兴软件有限责任公司 | Sending method, synchronous method and the device of synchronization signal in a kind of communication system |
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| CN105553912B (en) * | 2015-12-25 | 2018-12-11 | 魅族科技（中国）有限公司 | Communication means, communication device and the access point of WLAN |
| CN105553912A (en) * | 2015-12-25 | 2016-05-04 | 魅族科技（中国）有限公司 | Communication method and communication device of wireless local area network and access point |
| CN107645769B (en) * | 2016-07-22 | 2019-12-13 | 电信科学技术研究院 | data transmission method and device |
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