CN104065593A - Physical frame sending method and system - Google Patents
Physical frame sending method and system Download PDFInfo
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- CN104065593A CN104065593A CN201310086273.8A CN201310086273A CN104065593A CN 104065593 A CN104065593 A CN 104065593A CN 201310086273 A CN201310086273 A CN 201310086273A CN 104065593 A CN104065593 A CN 104065593A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0204—Channel estimation of multiple channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
Abstract
The invention provides a physical frame sending method and system, wherein the method and the system are applied to a base station side and/or a terminal side in an orthogonal frequency division multiplexing (OFDM) system. The method comprises the steps that a physical frame is sent; an OFDM symbol which is used for channel estimation is comprised in a lead code of the physical frame; and the number of subcarriers which bear a nonzero value in the OFDM symbol is less than or equal to the number of data subcarriers in the OFDM symbol which is used for bearing data in the physical frame. The system comprises a frame organizing unit which is used for organizing the physical frame to be sent and a sending unit which is used for sending the physical frame organized by the frame organizing unit. The lead code of the physical frame comprises the OFDM symbol which is used for channel estimation. The number of the subcarriers which bear the nonzero value in the OFDM symbol is less than or equal to the number of the data subcarriers in the OFDM symbol which is used for bearing the data in the physical frame. According to the invention, the design complexity is simplified; power allocation can be concentrated on the subcarriers of limited number; and the ability to prevent noise interference is improved.
Description
Technical field
The present invention relates to the crossing domain of computer network and radio communication, relate in particular to a kind of sending method and system of physical frame.
Background technology
At current wireless communication field, people are more and more higher to the requirement of wireless transmission rate, larger bandwidth is a conventional solution, but the use that the frequency selectivity of wireless channel is large bandwidth has brought restriction, multi-carrier OFDM (Orthogonal Frequency Division Multiplexing, OFDM) appearance of technology has solved this restriction greatly, and along with the high speed development of chip technology, OFDM technology obtains a wide range of applications.In actual ofdm communication system, need to design corresponding lead code and assist the application of OFDM technology, such as standards such as IEEE802.11g/n/ac, lead code is comprised of 3 different parts of function conventionally, these 3 parts realize by 3 different sequences respectively, a sequence is used for realizing time synchronized function, and a sequence is used for realizing channel estimation function, and a sequence is used for realizing signaling function.For realizing the sequence of time synchronized function, need to there is good correlation in time domain, from frequency domain, nonzero value in sequence is not connected, and in sequence, be spacedly distributed (if dc point position be sequence centre position carrying be null value, regard it as so nonzero value).In common design, between every a pair of nonzero value, have 2 null values at least, and then in the OFDM symbol of each carrying time synchronized sequence, the subcarrier number of carrying nonzero value is much smaller than the number of data subcarrier in the OFDM symbol of carrying data; For the sequence that realizes channel estimation function, need to cover as much as possible the wide or subcarrier of the subband of all divisions, to the channel information on the wide or subcarrier of all subbands can be provided, therefore in common design, the subcarrier number of carrying nonzero value in the OFDM symbol of Bearer Channel estimated sequence will at least equal to carry the number sum of data subcarrier and pilot sub-carrier in the OFDM symbol of data; The sequence that realizes signaling function is relevant to concrete communication system.
In recent years, industrial circle starts to pay close attention to millimere-wave band, current IEEE (Institute of Electrical andElectronics Engineers, IEEE-USA) normal structure has been formulated the IEEE802.11ad standard that is positioned at 60GHz frequency range, and is advancing the formulation for the IEEE802.11aj standard of Chinese 45GHz and 60GHz frequency range.This wave band usable spectrum is wide, and millimeter wave has following characteristic in radio communication: while 1, propagating in free space, be subject to the impact of Atmospheric Absorption huge, be only applicable to short-distance wireless communication in the situation that of transmit power limited; 2, millimetre wavelength is shorter, and after running into barrier, its launch loss and transmission loss are very large, is substantially only applicable to horizon communication.These propagation characteristics have determined that millimeter wave is mainly applicable to short distance sighting distance scene, such as family parlor, meeting room etc. in personal radio communication field.In this class application scenarios, communication equipment all remains static conventionally, and is arranged in unscreened environment, so the channel between communicating pair is a non-frequency-selective channel.Thereby when utilizing millimeter wave to carry out short distance horizon communication, although bandwidth can reach the rank of gigabit, communication channel is a flat channel.If therefore use OFDM technology, in its lead code for the part of channel estimating without designing according to the channel estimating of subcarrier level.
Summary of the invention
The object of the present invention is to provide a kind of sending method and system of physical frame, adopt this structure meeting under the prerequisite of channel estimating performance, simplify the design of lead code.
For addressing the above problem, the invention provides a kind of sending method of physical frame, be applied to base station side and/or end side in ofdm system, comprising:
Send physical frame;
Wherein, in the lead code of described physical frame, comprise the OFDM symbol for channel estimating; The subcarrier number of carrying nonzero value in described OFDM symbol be less than or equal to described physical frame in for carrying the data subcarrier number of the OFDM symbol of data.
Further,
The subcarrier number of carrying nonzero value for the OFDM symbol of channel estimating equals in described physical frame for carrying the number of the OFDM symbol pilot sub-carrier of data.
Further,
The position of carrying the subcarrier of nonzero value for the OFDM symbol of channel estimating, with in described physical frame for carrying the position consistency of the OFDM symbol pilot sub-carrier of data.
Further,
The subcarrier number of carrying nonzero value for the OFDM symbol of channel estimating is greater than in described physical frame for carrying the number of the OFDM symbol pilot sub-carrier of data, and described for carrying the subset that the index set of the OFDM symbol pilot sub-carrier of data is index set of the described OFDM symbol for the channel estimating subcarrier that carries nonzero value.
Further,
The value of carrying subcarrier number, sub-carrier indices set and the nonzero value of nonzero value for the OFDM symbol of channel estimating is consistent respectively with the value of nonzero value number, sub-carrier indices set and the nonzero value of OFDM symbol for time synchronized.
Further,
The quantity of the described OFDM symbol for channel estimating is greater than 1, and for the part of each OFDM symbols carry channel estimation sequence of channel estimating.
Further,
Start continuous grouping from the beginning of the described frequency domain sequence for channel estimating, every N_c nonzero value be divided into one group, by each grouping be mapped to one by one in order for channel estimating respectively for the OFDM symbol of channel estimating; Wherein, N_c represents the subcarrier number of the nonzero value that each carries for the OFDM symbol of channel estimating.
Further, described method also comprises:
When the described frequency domain sequence for channel estimating is divided into groups, if the not enough N_c of last group nonzero value is individual, by fixed non-zero value or with the nonzero value at the described frequency domain sequence beginning for channel estimating of endless form intercepting, supply.
Further,
By each grouping be mapped to one by one in order for channel estimating respectively for the OFDM symbol of channel estimating on time, if packet count N_z is less than the quantity of the described OFDM symbol for channel estimating, after having shone upon N_z group, adopt endless form, again since first group of mapping, until all corresponding grouping of each OFDM symbol for channel estimating.
Further,
The quantity of the described OFDM symbol for channel estimating is greater than 1, and is carrying the identical frequency domain sequence for channel estimating for each OFDM symbol of channel estimating.
Further,
The described frequency domain sequence for channel estimating is identical for the frequency domain sequence of time synchronized with described lead code.
Correspondingly, the present invention also provides a kind of transmitting system of physical frame, is applied to base station side and/or end side in ofdm system, comprising:
Framing unit, for organizing physical frame to be sent; Wherein, in the lead code of described physical frame, comprise the OFDM symbol for channel estimating; The subcarrier number of carrying nonzero value in described OFDM symbol be less than or equal to described physical frame in for carrying the data subcarrier number of the OFDM symbol of data;
Transmitting element, for sending the good described physical frame of described framing cellular organization.
Further,
In the described physical frame of described framing cellular organization, the subcarrier number of carrying nonzero value for the OFDM symbol of channel estimating equals in described physical frame for carrying the number of the OFDM symbol pilot sub-carrier of data.
Further,
In the described physical frame of described framing cellular organization, the position of carrying the subcarrier of nonzero value for the OFDM symbol of channel estimating, with in described physical frame for carrying the position consistency of the OFDM symbol pilot sub-carrier of data.
Further,
In the described physical frame of described framing cellular organization, the subcarrier number of carrying nonzero value for the OFDM symbol of channel estimating is greater than in described physical frame for carrying the number of the OFDM symbol pilot sub-carrier of data, and described for carrying the subset that the index set of the OFDM symbol pilot sub-carrier of data is index set of the described OFDM symbol for the channel estimating subcarrier that carries nonzero value.
Further,
In the described physical frame of described framing cellular organization, the value of carrying subcarrier number, sub-carrier indices set and the nonzero value of nonzero value for the OFDM symbol of channel estimating is consistent respectively with the value of nonzero value number, sub-carrier indices set and the nonzero value of OFDM symbol for time synchronized.
Further,
In the described physical frame of described framing cellular organization, the quantity of the described OFDM symbol for channel estimating is greater than 1, and for the part of each OFDM symbols carry channel estimation sequence of channel estimating.
Further,
Described framing unit, for starting continuous grouping from the beginning of the described frequency domain sequence for channel estimating, is divided into one group by every N_c nonzero value, by each divide into groups to be mapped to one by one in order for channel estimating respectively for the OFDM symbol of channel estimating; Wherein, N_c represents the subcarrier number of the nonzero value that each carries for the OFDM symbol of channel estimating.
Further,
Described framing unit is also for when dividing into groups to the described frequency domain sequence for channel estimating, if not enough N_c of last group nonzero value, supplies by fixed non-zero value or with the nonzero value at the described frequency domain sequence beginning for channel estimating of endless form intercepting.
Further,
Described framing unit also for by each grouping be mapped to one by one in order for channel estimating respectively for the OFDM symbol of channel estimating on time, if packet count N_z is less than the quantity of the described OFDM symbol for channel estimating, after having shone upon N_z group, adopt endless form, again since first group of mapping, until all corresponding grouping of each OFDM symbol for channel estimating.
Further,
In the described physical frame of described framing cellular organization, the quantity of the described OFDM symbol for channel estimating is greater than 1, and is carrying the identical frequency domain sequence for channel estimating for each OFDM symbol of channel estimating.
Further,
In the described physical frame of described framing cellular organization, the described frequency domain sequence for channel estimating is identical for the frequency domain sequence of time synchronized with described lead code.
The present invention has simplified design complexities, and power division can concentrate on the subcarrier of limited quantity, has improved the ability of anti-interference noise, and then has improved the precision of channel estimating.
Accompanying drawing explanation
Fig. 1 is the transmitting system structural representation of a kind of physical frame in the embodiment of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, hereinafter in connection with accompanying drawing, embodiments of the invention are elaborated.It should be noted that, in the situation that not conflicting, the embodiment in the application and the feature in embodiment be combination in any mutually.
In the present embodiment, a kind of sending method of physical frame, is applied to base station and/or end side in ofdm system, comprising:
Send physical frame, wherein, in the lead code of this physical frame, comprise the OFDM symbol for channel estimating, the subcarrier number of carrying nonzero value in described OFDM symbol be less than or equal to this physical frame in for carrying the data subcarrier number of the OFDM symbol of data.
The subcarrier number of preferably, carrying nonzero value for the OFDM symbol of channel estimating equals in this physical frame for carrying the number of the OFDM symbol pilot sub-carrier of data; Number and the position of for the OFDM symbol of channel estimating, carrying the subcarrier of nonzero value, and for carrying number and the position consistency of the OFDM symbol pilot sub-carrier of data.
Preferably, the subcarrier number of carrying nonzero value for the OFDM symbol of channel estimating is greater than in this physical frame for carrying the number of the OFDM symbol pilot sub-carrier of data, and for carrying the subset that the index set of the OFDM symbol pilot sub-carrier of data is index set of OFDM symbol for the channel estimating subcarrier that carries nonzero value;
Preferably, the value of carrying subcarrier number, sub-carrier indices set and the nonzero value of nonzero value for the OFDM symbol of channel estimating is consistent respectively with the value of nonzero value number, sub-carrier indices set and the nonzero value of OFDM symbol for time synchronized;
Preferably, for the OFDM symbol quantity of channel estimating, be greater than 1, and for the part of each OFDM symbols carry channel estimation sequence of channel estimating.
By several application examples, the present invention is further described below.
Application example one
In adopting the system of OFDM technology, if IFFT (the Inverse Fast-Fourier-Transformation that system adopts N to order, Fast Fourier Transform Inverse) computing, in the OFDM symbol of carrying data, for carrying the subcarrier number of data, being N_d, is N_p for carrying the subcarrier number of pilot tone; Wherein: N_d and N_p sum are less than N, and N_d is greater than N_p.Lead code part before the OFDM symbol of carrying data, comprise for 1 of channel estimating above OFDM symbol, in each OFDM symbol, carrying the identical frequency domain sequence for channel estimating, the subcarrier number of carrying nonzero value on each OFDM symbol is N_c, and wherein N_c is less than the value of N_d.
Application example two
In adopting the system of OFDM technology, if the IFFT computing that system adopts N to order, in the OFDM symbol of carrying data, is N_d for carrying the subcarrier number of data, for carrying the subcarrier number of pilot tone, be N_p; Wherein, N_d and N_p sum are less than N, and N_d is greater than N_p.Lead code part before the OFDM symbol of carrying data, comprise for 1 of channel estimating above OFDM symbol, in each OFDM symbol, carrying the identical frequency domain sequence for channel estimating, the subcarrier number of carrying nonzero value on each OFDM symbol is N_c, and wherein N_c equals the value of N_p.
Application example three
In adopting the system of OFDM technology, if the IFFT computing that system adopts N to order, in the OFDM symbol of carrying data, is N_d for carrying the subcarrier number of data, for carrying the subcarrier number of pilot tone, be N_p; Pilot tone shared sub-carrier positions in OFDM symbol be (P1, P2 ..., PN_P); Wherein, N_d and N_p sum are less than N, and N_d is greater than N_p.Lead code part before the OFDM symbol of carrying data, comprise for 1 of channel estimating above OFDM symbol, in each OFDM symbol, carrying the identical frequency domain sequence for channel estimating, the subcarrier number of carrying nonzero value on each OFDM symbol is N_c, and wherein N_c equals the value of N_p, and at the OFDM symbol for channel estimating, the position of the subcarrier of carrying nonzero value is (P1, P2 ..., PN_P).
Application example four
In adopting the system of OFDM technology, if the IFFT computing that system adopts N to order, in the OFDM symbol of carrying data, is N_d for carrying the subcarrier number of data, for carrying the subcarrier number of pilot tone, be N_p; The sub-carrier positions that pilot tone takies in OFDM symbol for (P1, P2 ..., PN_P); Wherein, N_d and N_p sum are less than N, and N_d is greater than N_p.Lead code part before the OFDM symbol of carrying data, comprise for 1 of channel estimating above OFDM symbol, in each OFDM symbol, carrying the identical frequency domain sequence for channel estimating, the subcarrier number of carrying nonzero value on each OFDM symbol is N_c, and wherein N_c is greater than the value of N_p, but be less than N_d, and at the OFDM symbol for channel estimating, the position of the subcarrier of carrying nonzero value at least comprises (P1, P2, ..., PN_P).
Application example five
In adopting the system of OFDM technology, if the IFFT computing that system adopts N to order, in the OFDM symbol of carrying data, is N_d for carrying the subcarrier number of data, for carrying the subcarrier number of pilot tone, be N_p; The sub-carrier positions that pilot tone takies in OFDM symbol for (P1, P2 ..., PN_P); Wherein, N_d and N_p sum are less than N, and N_d is greater than N_p.Lead code part before the OFDM symbol of carrying data, comprise the OFDM symbol for time synchronized, in each OFDM symbol, carrying the identical frequency domain sequence for time synchronized, the subcarrier number of carrying nonzero value on each OFDM symbol is N_s, and N_s is less than N_d, suppose that the frequency domain sequence for time synchronized is S.Above-mentioned lead code part also comprises for 1 of channel estimating above OFDM symbol, in each OFDM symbol, carrying the identical frequency domain sequence for channel estimating, this frequency domain sequence is sequence S, and lead code is partly same sequence for the frequency domain sequence of channel estimating and time synchronized.
Application example six
In adopting the system of OFDM technology, if the IFFT computing that system adopts N to order, in the OFDM symbol of carrying data, is N_d for carrying the subcarrier number of data.Lead code partly comprises n the OFDM symbol for channel estimating, the sub-carrier number that carries nonzero value in each OFDM symbol is N_c, wherein N_c is less than N_d, the number that is used for the frequency domain sequence nonzero value of channel estimating is N_e, wherein N_e is greater than N_c, start continuous grouping from the beginning of the frequency domain sequence for channel estimating so, every N_c nonzero value is divided into one group, if not enough N_c of last group nonzero value, can supply for the nonzero value at the frequency domain sequence beginning of channel estimating by fixed non-zero value or with endless form intercepting.Suppose that packet count is N_z, each grouping is mapped to respectively to n the OFDM symbol for channel estimating in order, if n equals N_z, i.e. mapping one to one; If n is greater than N_z, shone upon so after N_z group, adopt endless form, then since first group of mapping, until n mapping; If n is less than N_z, can select n group to be mapped on n OFDM symbol according to predefined preference pattern so, for example choose the front n group in N_z group, or choose the rear n group in N_z group, or choose the middle n group in N_z group.
In addition, in the present embodiment, a kind of transmitting system of physical frame, is applied to base station side and/or end side in ofdm system, as shown in Figure 1, comprising:
Framing unit, for organizing physical frame to be sent; Wherein, in the lead code of described physical frame, comprise the OFDM symbol for channel estimating; The subcarrier number of carrying nonzero value in described OFDM symbol be less than or equal to described physical frame in for carrying the data subcarrier number of the OFDM symbol of data;
Transmitting element, for sending the good described physical frame of described framing cellular organization.
Preferably,
In the described physical frame of described framing cellular organization, the subcarrier number of carrying nonzero value for the OFDM symbol of channel estimating equals in described physical frame for carrying the number of the OFDM symbol pilot sub-carrier of data.
Preferably,
In the described physical frame of described framing cellular organization, the position of carrying the subcarrier of nonzero value for the OFDM symbol of channel estimating, with in described physical frame for carrying the position consistency of the OFDM symbol pilot sub-carrier of data.
Preferably,
In the described physical frame of described framing cellular organization, the subcarrier number of carrying nonzero value for the OFDM symbol of channel estimating is greater than in described physical frame for carrying the number of the OFDM symbol pilot sub-carrier of data, and described for carrying the subset that the index set of the OFDM symbol pilot sub-carrier of data is index set of the described OFDM symbol for the channel estimating subcarrier that carries nonzero value.
Preferably,
In the described physical frame of described framing cellular organization, the value of carrying subcarrier number, sub-carrier indices set and the nonzero value of nonzero value for the OFDM symbol of channel estimating is consistent respectively with the value of nonzero value number, sub-carrier indices set and the nonzero value of OFDM symbol for time synchronized.
Preferably,
In the described physical frame of described framing cellular organization, the quantity of the described OFDM symbol for channel estimating is greater than 1, and for the part of each OFDM symbols carry channel estimation sequence of channel estimating.
Preferably,
Described framing unit, for starting continuous grouping from the beginning of the described frequency domain sequence for channel estimating, is divided into one group by every N_c nonzero value, by each divide into groups to be mapped to one by one in order for channel estimating respectively for the OFDM symbol of channel estimating; Wherein, N_c represents the subcarrier number of the nonzero value that each carries for the OFDM symbol of channel estimating.
Preferably,
Described framing unit is also for when dividing into groups to the described frequency domain sequence for channel estimating, if not enough N_c of last group nonzero value, supplies by fixed non-zero value or with the nonzero value at the described frequency domain sequence beginning for channel estimating of endless form intercepting.
Preferably,
Described framing unit also for by each grouping be mapped to one by one in order for channel estimating respectively for the OFDM symbol of channel estimating on time, if packet count N_z is less than the quantity of the described OFDM symbol for channel estimating, after having shone upon N_z group, adopt endless form, again since first group of mapping, until all corresponding grouping of each OFDM symbol for channel estimating.
Preferably,
In the described physical frame of described framing cellular organization, the quantity of the described OFDM symbol for channel estimating is greater than 1, and is carrying the identical frequency domain sequence for channel estimating for each OFDM symbol of channel estimating.
Preferably,
In the described physical frame of described framing cellular organization, the described frequency domain sequence for channel estimating is identical for the frequency domain sequence of time synchronized with described lead code.
One of ordinary skill in the art will appreciate that all or part of step in said method can come instruction related hardware to complete by program, described program can be stored in computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of above-described embodiment also can realize with one or more integrated circuits.Correspondingly, each the module/unit in above-described embodiment can adopt the form of hardware to realize, and also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
The foregoing is only the preferred embodiments of the present invention, be not intended to limit protection scope of the present invention.According to summary of the invention of the present invention; also can there be other various embodiments; in the situation that not deviating from spirit of the present invention and essence thereof; those of ordinary skill in the art are when making according to the present invention various corresponding changes and distortion; within the spirit and principles in the present invention all; any modification of doing, be equal to replacement, improvement etc., within protection scope of the present invention all should be included in.
Claims (22)
1. a sending method for physical frame, is applied to base station side and/or end side in OFDM (OFDM) system, comprising:
Send physical frame;
Wherein, in the lead code of described physical frame, comprise the OFDM symbol for channel estimating; The subcarrier number of carrying nonzero value in described OFDM symbol be less than or equal to described physical frame in for carrying the data subcarrier number of the OFDM symbol of data.
2. the method for claim 1, is characterized in that:
The subcarrier number of carrying nonzero value for the OFDM symbol of channel estimating equals in described physical frame for carrying the number of the OFDM symbol pilot sub-carrier of data.
3. method as claimed in claim 2, is characterized in that:
The position of carrying the subcarrier of nonzero value for the OFDM symbol of channel estimating, with in described physical frame for carrying the position consistency of the OFDM symbol pilot sub-carrier of data.
4. the method for claim 1, is characterized in that:
The subcarrier number of carrying nonzero value for the OFDM symbol of channel estimating is greater than in described physical frame for carrying the number of the OFDM symbol pilot sub-carrier of data, and described for carrying the subset that the index set of the OFDM symbol pilot sub-carrier of data is index set of the described OFDM symbol for the channel estimating subcarrier that carries nonzero value.
5. the method for claim 1, is characterized in that:
The value of carrying subcarrier number, sub-carrier indices set and the nonzero value of nonzero value for the OFDM symbol of channel estimating is consistent respectively with the value of nonzero value number, sub-carrier indices set and the nonzero value of OFDM symbol for time synchronized.
6. the method for claim 1, is characterized in that:
The quantity of the described OFDM symbol for channel estimating is greater than 1, and for the part of each OFDM symbols carry channel estimation sequence of channel estimating.
7. method as claimed in claim 6, is characterized in that:
Start continuous grouping from the beginning of the described frequency domain sequence for channel estimating, every N_c nonzero value be divided into one group, by each grouping be mapped to one by one in order for channel estimating respectively for the OFDM symbol of channel estimating; Wherein, N_c represents the subcarrier number of the nonzero value that each carries for the OFDM symbol of channel estimating.
8. method as claimed in claim 7, is characterized in that, also comprises:
When the described frequency domain sequence for channel estimating is divided into groups, if the not enough N_c of last group nonzero value is individual, by fixed non-zero value or with the nonzero value at the described frequency domain sequence beginning for channel estimating of endless form intercepting, supply.
9. method as claimed in claim 7 or 8, is characterized in that:
By each grouping be mapped to one by one in order for channel estimating respectively for the OFDM symbol of channel estimating on time, if packet count N_z is less than the quantity of the described OFDM symbol for channel estimating, after having shone upon N_z group, adopt endless form, again since first group of mapping, until all corresponding grouping of each OFDM symbol for channel estimating.
10. the method for claim 1, is characterized in that:
The quantity of the described OFDM symbol for channel estimating is greater than 1, and is carrying the identical frequency domain sequence for channel estimating for each OFDM symbol of channel estimating.
11. methods as claimed in claim 10, is characterized in that:
The described frequency domain sequence for channel estimating is identical for the frequency domain sequence of time synchronized with described lead code.
The transmitting system of 12. 1 kinds of physical frames, is applied to base station side and/or end side in ofdm system, comprising:
Framing unit, for organizing physical frame to be sent; Wherein, in the lead code of described physical frame, comprise the OFDM symbol for channel estimating; The subcarrier number of carrying nonzero value in described OFDM symbol be less than or equal to described physical frame in for carrying the data subcarrier number of the OFDM symbol of data;
Transmitting element, for sending the good described physical frame of described framing cellular organization.
13. systems as claimed in claim 12, is characterized in that:
In the described physical frame of described framing cellular organization, the subcarrier number of carrying nonzero value for the OFDM symbol of channel estimating equals in described physical frame for carrying the number of the OFDM symbol pilot sub-carrier of data.
14. systems as claimed in claim 13, is characterized in that:
In the described physical frame of described framing cellular organization, the position of carrying the subcarrier of nonzero value for the OFDM symbol of channel estimating, with in described physical frame for carrying the position consistency of the OFDM symbol pilot sub-carrier of data.
15. systems as claimed in claim 12, is characterized in that:
In the described physical frame of described framing cellular organization, the subcarrier number of carrying nonzero value for the OFDM symbol of channel estimating is greater than in described physical frame for carrying the number of the OFDM symbol pilot sub-carrier of data, and described for carrying the subset that the index set of the OFDM symbol pilot sub-carrier of data is index set of the described OFDM symbol for the channel estimating subcarrier that carries nonzero value.
16. systems as claimed in claim 12, is characterized in that:
In the described physical frame of described framing cellular organization, the value of carrying subcarrier number, sub-carrier indices set and the nonzero value of nonzero value for the OFDM symbol of channel estimating is consistent respectively with the value of nonzero value number, sub-carrier indices set and the nonzero value of OFDM symbol for time synchronized.
17. systems as claimed in claim 12, is characterized in that:
In the described physical frame of described framing cellular organization, the quantity of the described OFDM symbol for channel estimating is greater than 1, and for the part of each OFDM symbols carry channel estimation sequence of channel estimating.
18. systems as claimed in claim 17, is characterized in that:
Described framing unit, for starting continuous grouping from the beginning of the described frequency domain sequence for channel estimating, is divided into one group by every N_c nonzero value, by each divide into groups to be mapped to one by one in order for channel estimating respectively for the OFDM symbol of channel estimating; Wherein, N_c represents the subcarrier number of the nonzero value that each carries for the OFDM symbol of channel estimating.
19. systems as claimed in claim 18, is characterized in that:
Described framing unit is also for when dividing into groups to the described frequency domain sequence for channel estimating, if not enough N_c of last group nonzero value, supplies by fixed non-zero value or with the nonzero value at the described frequency domain sequence beginning for channel estimating of endless form intercepting.
20. systems as described in claim 18 or 19, is characterized in that:
Described framing unit also for by each grouping be mapped to one by one in order for channel estimating respectively for the OFDM symbol of channel estimating on time, if packet count N_z is less than the quantity of the described OFDM symbol for channel estimating, after having shone upon N_z group, adopt endless form, again since first group of mapping, until all corresponding grouping of each OFDM symbol for channel estimating.
21. systems as claimed in claim 12, is characterized in that:
In the described physical frame of described framing cellular organization, the quantity of the described OFDM symbol for channel estimating is greater than 1, and is carrying the identical frequency domain sequence for channel estimating for each OFDM symbol of channel estimating.
22. systems as claimed in claim 21, is characterized in that:
In the described physical frame of described framing cellular organization, the described frequency domain sequence for channel estimating is identical for the frequency domain sequence of time synchronized with described lead code.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310086273.8A CN104065593A (en) | 2013-03-18 | 2013-03-18 | Physical frame sending method and system |
| PCT/CN2013/090487 WO2014146467A1 (en) | 2013-03-18 | 2013-12-26 | Physical frame sending method and system |
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| CN201310086273.8A CN104065593A (en) | 2013-03-18 | 2013-03-18 | Physical frame sending method and system |
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| CN104065593A true CN104065593A (en) | 2014-09-24 |
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| CN201310086273.8A Pending CN104065593A (en) | 2013-03-18 | 2013-03-18 | Physical frame sending method and system |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1501251A2 (en) * | 2003-07-18 | 2005-01-26 | Broadcom Corporation | Frame structure for multicarrier transmission |
| CN1984107A (en) * | 2005-12-12 | 2007-06-20 | 中国科学院上海微系统与信息技术研究所 | Leading sequence of multi-carrier system and its use |
| CN101599938A (en) * | 2009-04-28 | 2009-12-09 | 中国科学院国家授时中心 | A kind of orthogonal frequency division multiplexing (OFDM) ultra wide band system receiver time domain combined synchronization method |
| CN101808066A (en) * | 2009-02-18 | 2010-08-18 | 雷凌科技股份有限公司 | Switching method for long guard interval and short guard interval and module thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8213538B2 (en) * | 2007-05-29 | 2012-07-03 | Qualcomm Incorporated | Methods and apparatus for improved utilization of air link resources in a wireless communications system |
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- 2013-12-26 WO PCT/CN2013/090487 patent/WO2014146467A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1501251A2 (en) * | 2003-07-18 | 2005-01-26 | Broadcom Corporation | Frame structure for multicarrier transmission |
| CN1984107A (en) * | 2005-12-12 | 2007-06-20 | 中国科学院上海微系统与信息技术研究所 | Leading sequence of multi-carrier system and its use |
| CN101808066A (en) * | 2009-02-18 | 2010-08-18 | 雷凌科技股份有限公司 | Switching method for long guard interval and short guard interval and module thereof |
| CN101599938A (en) * | 2009-04-28 | 2009-12-09 | 中国科学院国家授时中心 | A kind of orthogonal frequency division multiplexing (OFDM) ultra wide band system receiver time domain combined synchronization method |
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| WO2014146467A1 (en) | 2014-09-25 |
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Application publication date: 20140924 |