CN101488932B - Broadcast channel positioning method, apparatus and system in OFDM system - Google Patents
Broadcast channel positioning method, apparatus and system in OFDM system Download PDFInfo
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Abstract
The invention provides a positioning method, device and system of broadcast channel in Orthogonal Frequency Division Multiplexing (OFDM) system, which relates to the technical field of communication and improves the capture performance of the system. The method thereof includes the following steps: partial OFDM symbols of main broadcast channel of time slot in the OFDM system are adjacent to synchronizing channel and are positioned in front of the synchronizing channel; the OFDM symbols of the synchronizing channel use fixed cycle prefix length; and the position of the OFDM symbols of the main broadcast channel is determined by the fixed cycle prefix length, the OFDM symbols of the synchronizing channel and the position relation of the main broadcast channel and the synchronizing channel. The application of the embodiment of the invention can improve the capture performance of the system.
Description
Technical field
The present invention relates to communication technical field, relate in particular to localization method, the Apparatus and system of broadcast channel in OFDM (OFDM) system.
Background technology
In system of broadband wireless communication, because bandwidth greater than coherence bandwidth, make that channel is a frequency-selective channel, and OFDM (OFDM) technology is a kind of technology of effective solution frequency selectivity problem.
Transmission means as a kind of multicarrier; OFDM converts one group of low-speed parallel data flow transmitted into through the data flow with high-speed transfer; On one group of mutually orthogonal subcarrier, transmit simultaneously, system is reduced the susceptibility of multidiameter fading channel frequency selectivity greatly.
In the ofdm system, the OFDM frame is made up of a series of superframe, and each superframe comprises a plurality of frames, and every frame comprises a plurality of OFDM symbols.A superframe comprises one or more synchronizing channels (SCH) or broadcast channel (BCH) at least, and each synchronizing channel or broadcast channel take one or several OFDM symbol.
Wherein, each OFDM symbol all comprises two parts: Cyclic Prefix (CP, cycle prefix) and useful symbolic component.Wherein, the repetition of the last one piece of data of the normally useful symbolic component of Cyclic Prefix.The introducing of Cyclic Prefix under the situation of channel delay less than Cyclic Prefix, can be eliminated ISI (intersymbol interference) and ICI (inter-carrier interference) problem in the OFDM wireless communication system.If but the length of Cyclic Prefix is long, then can bring additional overhead.Because the difference of the size of each sub-district and channel delay expansion, therefore different circulating prefix-lengths possibly adopted in different sub-districts, under the prerequisite that guarantees elimination intersymbol interference and inter-carrier interference, reduces the expense of Cyclic Prefix as far as possible.
When terminal equipment inserts ofdm system, at first to obtain Time and Frequency Synchronization with the signal of some sub-districts in the system.This process of relating to Time and Frequency Synchronization from nothing is exactly the cell search process of terminal equipment.Cell searching is the process accomplishing down time-frequency synchronization and catch cell ID (CELL ID).The process of Cell searching is accomplished by broadcast channel and synchronizing channel together, and terminal equipment obtains regularly synchronous and Frequency Synchronization and cell ID through synchronizing channel, and obtains system information and cell-specific information through broadcast channel.
Accomplish whole cell search process, terminal equipment at first through the OFDM symbol at synchronizing channel place obtain regularly synchronously, information such as Frequency Synchronization and cell ID.Afterwards, obtain the information that send the sub-district through broadcast channel again.Behind the position of the OFDM symbol of knowing the synchronizing channel place; Owing to have Cyclic Prefix between each symbol; Therefore terminal equipment need be known the length information of Cyclic Prefix, could confirm the distance between broadcast channel and the synchronizing channel, thereby confirms the position of broadcast channel place OFDM symbol.
Have following several method can know the length information of Cyclic Prefix in the prior art: the one, utilize synchronizing channel to carry the length information of Cyclic Prefix; The 2nd, with synchronizing channel itself, the OFDM symbol between synchronizing channel and the broadcast channel adopts the Cyclic Prefix of regular length, and the length information of the Cyclic Prefix of other OFDM symbols carries through broadcast channel; The 3rd, the distance between blind detection synchronizing channel and the broadcast channel.
But in realizing process of the present invention, the inventor finds to exist at least in the prior art following problem:
If utilize synchronizing channel to carry the length information of Cyclic Prefix, will certainly increase the number of synchronization channel sequence, increase the complexity that terminal equipment is caught synchronizing sequence, and reduce the synchronization acquistion performance.If with synchronizing channel itself, and the Cyclic Prefix of the employing of the OFDM symbol between synchronizing channel and broadcast channel regular length, but do not need may increase unnecessary spending under the scene of long loop prefix at some.And if detection synchronizing channel blindly and the distance between the broadcast channel then can cause the reduction of system acquisition performance.
Summary of the invention
On the one hand, embodiments of the invention provide the localization method of broadcast channel in a kind of ofdm system.Utilize the described method of the embodiment of the invention, can improve the performance of system acquisition among the OFDM.
The localization method of broadcast channel adopts following technical scheme in the embodiments of the invention ofdm system:
The localization method of broadcast channel in a kind of ofdm system, described method comprises the steps:
The shared OFDM symbol of the main broadcast channel of part time slot is adjacent with synchronizing channel in the said ofdm system, and is positioned at before the said synchronizing channel;
The shared OFDM symbol of said synchronizing channel adopts the fixed cycles prefix length;
Through said fixed cycles prefix length, the length of the shared OFDM symbol of synchronizing channel, and the position of said main broadcast channel and synchronizing channel relation are confirmed the position of the OFDM symbol that main broadcast channel is shared.Embodiments of the invention; Because the main broadcast channel in the part time slot among the OFDM is positioned at synchronizing channel adjacent position before, the shared OFDM symbol of synchronizing channel adopts the fixed cycles prefix length; And the fixed cycles prefix length is known for terminal equipment; Therefore, after the length that has obtained the shared OFDM symbol of synchronizing channel, utilize said fixed cycles prefix length; And the adjacent position of main broadcast channel and synchronizing channel relation, the position at main broadcast channel place in just can confirming.Therefore, utilize embodiments of the invention, can navigate to the position of broadcast channel place OFDM symbol fast, improved the performance of system acquisition.
Second aspect, embodiments of the invention provide the localization method of broadcast channel in other a kind of ofdm system.Utilize the described method of the embodiment of the invention, can improve the performance of system acquisition among the OFDM.
The localization method of broadcast channel adopts following technical scheme in the embodiments of the invention ofdm system:
The localization method of broadcast channel in a kind of ofdm system, described method comprises the steps:
The shared OFDM symbol of the main broadcast channel of part time slot is adjacent with synchronizing channel in the said ofdm system, and is positioned at after the said synchronizing channel;
The shared OFDM symbol of said main broadcast channel adopts the fixed cycles prefix length;
Through said fixed cycles prefix length, the length of the OFDM symbol that said synchronizing channel is shared, and the position of said main broadcast channel and synchronizing channel relation are confirmed the position of the OFDM symbol that main broadcast channel is shared.
Embodiments of the invention; Because the main broadcast channel in the part time slot among the OFDM; Be positioned at synchronizing channel adjacent position afterwards, the shared OFDM symbol of main broadcast channel adopts the fixed cycles prefix length, and the fixed cycles prefix length is known for terminal equipment.Therefore, after the length that has obtained the shared OFDM symbol of synchronizing channel, utilize said fixed cycles prefix length, and the adjacent position of main broadcast channel and synchronizing channel relation, just can confirm the position that main broadcast channel belongs to.Therefore, utilize embodiments of the invention, can navigate to the position of broadcast channel place OFDM symbol fast, improved the performance of system acquisition.
The third aspect, embodiments of the invention provide the device of the location of broadcast channel in a kind of ofdm system.Utilize the described device of the embodiment of the invention, can improve the performance of system acquisition among the OFDM.
The device of embodiments of the invention system acquisition adopts following technical scheme:
The positioner of broadcast channel in a kind of ofdm system, said device comprises:
First receiving element is used for receiving the time slot of ofdm system, and the center is divided and comprised a main broadcast channel in the time slot at least, and synchronizing channel;
First positioning unit; Be used for through the preset synchronizing channel fixed cycles prefix length of said part time slot; The length of the shared OFDM symbol of synchronizing channel and the position of main broadcast channel and synchronizing channel concern, confirm the position of the OFDM symbol that main broadcast channel is shared.
Embodiments of the invention; Preset in the part time slot that first positioning unit utilizes first receiving element to be received; Synchronizing channel fixed cycles prefix length; The length of the shared OFDM symbol of synchronizing channel and the position of main broadcast channel and synchronizing channel relation just can be confirmed the position that main broadcast channel belongs to.Therefore, utilize embodiments of the invention, can navigate to the position of broadcast channel place OFDM symbol fast, improved the performance of system acquisition.
Fourth aspect, embodiments of the invention provide the device of the location of broadcast channel in a kind of ofdm system.Utilize the described device of the embodiment of the invention, can improve the performance of system acquisition among the OFDM.
The device of embodiments of the invention system acquisition adopts following technical scheme:
The positioner of broadcast channel in a kind of ofdm system, said device comprises:
Second receiving element is used for receiving the time slot of ofdm system, and the center is divided and comprised a main broadcast channel in the time slot at least, and synchronizing channel;
The 3rd positioning unit; Be used for fixed cycles prefix length through the preset main broadcast channel of affiliated portion part time slot; The length of the shared OFDM symbol of synchronizing channel and the position of main broadcast channel and synchronizing channel concern, confirm the position of the OFDM symbol that main broadcast channel is shared.
Embodiments of the invention; Preset in the part that the 3rd positioning unit utilizes second receiving element to be received; The fixed cycles prefix length of main broadcast channel; The length of the shared OFDM symbol of synchronizing channel and the position of main broadcast channel and synchronizing channel relation just can be confirmed the position that main broadcast channel belongs in the first.Therefore, utilize embodiments of the invention, can navigate to the position of broadcast channel place OFDM symbol fast, improved the performance of system acquisition.
The 5th aspect, embodiments of the invention provide the system of the location of broadcast channel in a kind of ofdm system.Utilize the described system of the embodiment of the invention, can improve the performance of system acquisition among the OFDM.
The navigation system of broadcast channel in a kind of ofdm system, said system comprises: base station unit, and terminal equipment;
Wherein, the said base station unit of base station unit comprises:
The frame division unit is used for the part time slot of ofdm system is divided at least two parts, and wherein first comprises a main broadcast channel at least, and second portion comprises a synchronizing channel at least;
The position is provided with the unit, is used for the OFDM symbol that said main broadcast channel is shared, is arranged to be positioned at the adjacent position before or after the shared OFDM symbol of second portion;
Definition unit is used to set the shared OFDM symbol of second portion and adopts the fixed cycles prefix length or set the shared OFDM symbol employing fixed cycles prefix length of said main broadcast channel;
Described terminal equipment comprises:
Search unit is used for searching the synchronizing channel of the part time slot of said ofdm system;
Positioning unit is used for through said fixed cycles prefix length, and the length of the shared OFDM symbol of synchronizing channel, confirms the position of the OFDM symbol that main broadcast channel is shared.
Utilize the described system of the embodiment of the invention, can navigate to the position of the broadcast channel place OFDM symbol in the subframe fast, improved the performance of system acquisition.
Description of drawings
Fig. 1 is the flow chart of the localization method of broadcast channel in the embodiments of the invention ofdm system;
Fig. 2 is among the embodiment one of the localization method of broadcast channel in the embodiments of the invention ofdm system, the structural representation of subframe;
Fig. 3 is among the embodiment two of the localization method of broadcast channel in the embodiments of the invention ofdm system, the structural representation of subframe;
Fig. 4 is among the embodiment three of the localization method of broadcast channel in the embodiments of the invention ofdm system, the structural representation of subframe;
In Fig. 5 embodiments of the invention ofdm system among the embodiment four of the localization method of broadcast channel, the structural representation of subframe;
In Fig. 6 embodiments of the invention ofdm system among the embodiment five of the localization method of broadcast channel, the structural representation of subframe;
In Fig. 7 embodiments of the invention ofdm system among the embodiment six of the localization method of broadcast channel, the structural representation of subframe;
Another flow chart of the localization method of broadcast channel in Fig. 8 embodiments of the invention ofdm system;
In Fig. 9 embodiments of the invention ofdm system among the embodiment seven of the localization method of broadcast channel, the structural representation of subframe;
In Figure 10 embodiments of the invention ofdm system among the embodiment eight of the localization method of broadcast channel, the structural representation of subframe;
In Figure 11 embodiments of the invention ofdm system among the embodiment nine of the localization method of broadcast channel, the structural representation of subframe;
The structure chart of the positioner of broadcast channel in Figure 12 embodiments of the invention ofdm system;
Another structure chart of the positioner of broadcast channel in Figure 13 embodiments of the invention ofdm system;
The sketch map of the navigation system of broadcast channel in Figure 14 embodiments of the invention ofdm system.
Embodiment
For solving in the prior art; Owing to utilize synchronizing channel (SCH) to carry cyclic prefix information; And make the difficulty of terminal equipment when catching synchronizing sequence increase, and the system acquisition performance that causes reduces, or because the problem of the system acquisition performance reduction that the distance between blind detection synchronizing channel (SCH) and the broadcast channel (BCH) causes; The localization method of broadcast channel in the embodiments of the invention ofdm system; With the main broadcast channel in the part time slot among the OFDM, be arranged to be positioned at synchronizing channel adjacent position before, and the shared OFDM symbol of synchronizing channel adopts the fixed cycles prefix length.Because said fixed cycles prefix length is known for terminal equipment; Therefore; After the length that has obtained the shared OFDM symbol of synchronizing channel; Utilize said fixed cycles prefix length, and the position of main broadcast channel and synchronizing channel relation, the position at main broadcast channel place in just can determining.
Describe for ease, in an embodiment of the present invention, the part time slot in the ofdm system is divided into two parts at least.Wherein first comprises a main broadcast channel at least, and second portion comprises synchronizing channel at least.But it should be noted that " first ", " second portion " in the embodiment of the invention can not limit the technical scheme of the embodiment of the invention, those skilled in the art should not receive the restriction of this kind description in embodiment of the present invention.
In an embodiment of the present invention, described time slot comprises several OFDM symbols.
For the advantage of the technical scheme that makes the embodiment of the invention is clearer, embodiments of the invention are done further to specify below in conjunction with accompanying drawing.
As shown in Figure 1, the localization method of broadcast channel comprises the steps: in the embodiments of the invention ofdm system
S1: the shared OFDM symbol of the main broadcast channel of part time slot in the said ofdm system, adjacent with synchronizing channel, and be positioned at before the said synchronizing channel;
S2: the shared OFDM symbol of said synchronizing channel adopts the fixed cycles prefix length;
S3: through said fixed cycles prefix length, the length of the shared OFDM symbol of synchronizing channel, and the position of said main broadcast channel and synchronizing channel relation are confirmed the position of the OFDM symbol that main broadcast channel is shared.
Can find out through top implementation process, utilize embodiments of the invention, avoid the low problem of system acquisition performance in the prior art, can navigate to the position of broadcast channel place OFDM symbol fast, improve the performance of system acquisition.
Wherein, the synchronizing channel that is comprised in the second portion can be primary synchronization channel, is used for the bearing system parameter, information such as system bandwidth.Primary synchronization channel generally carries information such as cell ID.It generally is to be used for carrying out timing, frequency offset estimating and identification cell ID.
So in the said process; When described synchronizing channel was primary synchronization channel, described step S4 just was specially and is, through said fixed cycles prefix length; And the length of the shared OFDM symbol of said primary synchronization channel, confirm the position of the OFDM symbol that main broadcast channel is shared.
Certainly, described second portion also can comprise an auxiliary synchronization channel at least, is used for carrying cell identity information.In this case, primary synchronization channel does not carry cell identity information.
Equally, described first also can comprise an auxilliary broadcast channel at least, is used for carrying sector special parameter etc.At this moment; In order to navigate to auxilliary broadcast channel by main broadcast channel; Include said auxilliary broadcast channel by the shared OFDM symbol of described main broadcast channel; And the circulating prefix-length information of main broadcast channel, the circulating prefix-length in this cyclic prefix information that main broadcast channel is entrained is called " normal cyclic prefix length "." normal cyclic prefix length " described here is corresponding with foregoing " fixed cycles prefix length ".Described " fixed cycles prefix length " stipulates that in wireless communication protocol so for terminal equipment, this parameter is known." normal cyclic prefix length " then is to be provided with as required by the base station, for example, can be set to 20us, 40us or the like.Therefore, this parameter is unknown for terminal equipment, must obtain corresponding circulating prefix-length information through the main broadcast channel of decoding, and could confirm auxilliary position of broadcast channel.
Respectively with various embodiment, be example below, describe first and second portion in said subframe with leading (Preamble) subframe, when comprising broadcasting or the synchronizing channel of varying number and kind, the detailed process of embodiments of the invention.
Embodiment one
As shown in Figure 2; First in leading subframe comprises a main broadcast channel P-BCH; Second portion comprises a primary synchronization channel P-SCH, and the Cyclic Prefix that the primary synchronization channel P-SCH of second portion adopts is fixed cycles prefix length (fixed CP length).Main broadcast channel is positioned at the adjacent position before the second portion primary synchronization channel.
Like this, terminal equipment at first captures primary synchronization channel in connecting system, realize Time and Frequency Synchronization fast, obtains cell ID.Then, again according to said fixed cycles prefix length, and the length of the shared OFDM symbol of primary synchronization channel, the fast Fourier transform (FFT) size navigates to main broadcast channel.Through the main broadcast channel of decoding, obtain information such as normal cyclic prefix length, system bandwidth.At last, the said auxilliary broadcast channel of decoding obtains the sector special parameter.
Embodiment two
As shown in Figure 3, the first in leading subframe comprises a main broadcast channel, and second portion comprises a primary synchronization channel and an auxiliary synchronization channel, and primary synchronization channel is positioned at the OFDM symbol before the auxiliary synchronization channel.The Cyclic Prefix that the primary synchronization channel of second portion, auxiliary synchronization channel adopt is the fixed cycles prefix length.Main broadcast channel is positioned at the adjacent position before the second portion, and adjacent with primary synchronization channel.
Like this, terminal equipment at first captures primary synchronization channel in connecting system, realize Time and Frequency Synchronization fast.Then, again according to said fixed cycles prefix length, and the length of the shared OFDM symbol of primary synchronization channel, navigate to auxiliary synchronization channel, obtain cell ID.Then, utilize the length and the corresponding fixed cycles prefix length thereof of the shared OFDM symbol of primary synchronization channel again, and the corresponding fixed cycles prefix length of auxiliary synchronization channel, navigate to main broadcast channel.Through the main broadcast channel of decoding, obtain information such as normal cyclic prefix length, system bandwidth.At last, the said auxilliary broadcast channel of decoding obtains the sector special parameter.
Embodiment three
As shown in Figure 4, the first in leading subframe comprises a main broadcast channel, an auxilliary broadcast channel, and said auxilliary broadcast channel takies a plurality of OFDM symbols, is positioned at before the shared OFDM symbol of main broadcast channel; Second portion comprises a primary synchronization channel and an auxiliary synchronization channel, and primary synchronization channel is positioned at the OFDM symbol before the auxiliary synchronization channel.。The Cyclic Prefix that the primary synchronization channel of second portion, auxiliary synchronization channel adopt is the fixed cycles prefix length.Main broadcast channel is positioned at the adjacent position before the second portion.Wherein, the shared OFDM symbol of main broadcast channel includes the normal cyclic prefix length information.
Equally, terminal equipment at first captures primary synchronization channel in connecting system, realize Time and Frequency Synchronization fast.Then, again according to said fixed cycles prefix length, and the length of the shared OFDM symbol of primary synchronization channel, navigate to auxiliary synchronization channel, obtain cell ID.Then, utilize the length and the corresponding fixed cycles prefix length thereof of the shared OFDM symbol of primary synchronization channel again, and the corresponding fixed cycles prefix length of auxiliary synchronization channel, navigate to main broadcast channel.Through the main broadcast channel of decoding, obtain information such as normal cyclic prefix, system bandwidth.Through said normal cyclic prefix length, and the length of the shared OFDM symbol of auxilliary broadcast channel, navigate to auxilliary position of broadcast channel.At last, the said auxilliary broadcast channel of decoding obtains the sector special parameter.
Embodiment four
As shown in Figure 5, the first in leading subframe comprises a main broadcast channel, an auxilliary broadcast channel, and said auxilliary broadcast channel takies a plurality of OFDM symbols, is positioned at before the shared OFDM symbol of main broadcast channel; Second portion comprises a primary synchronization channel.The Cyclic Prefix that the synchronizing channel of second portion adopts is the fixed cycles prefix length.Main broadcast channel is positioned at the adjacent position before the second portion.Wherein, the shared OFDM symbol of main broadcast channel includes the normal cyclic prefix length information.
Equally, terminal equipment at first captures primary synchronization channel in connecting system, realize Time and Frequency Synchronization fast, obtains cell ID.Then, again according to said fixed cycles prefix length, and the length of the shared OFDM symbol of primary synchronization channel, navigate to main broadcast channel.Through said normal cyclic prefix length, and the length of the shared OFDM symbol of auxilliary broadcast channel, navigate to auxilliary position of broadcast channel.At last, the said auxilliary broadcast channel of decoding obtains the sector special parameter.
Embodiment five
As shown in Figure 6, the first in leading subframe comprises a main broadcast channel, an auxilliary broadcast channel, and said auxilliary broadcast channel takies a plurality of OFDM symbols, and is positioned at before the shared OFDM symbol of main broadcast channel; Second portion comprises a primary synchronization channel and an auxiliary synchronization channel, and primary synchronization channel is positioned at the OFDM symbol after the auxiliary synchronization channel.The Cyclic Prefix that the primary synchronization channel of second portion, auxiliary synchronization channel adopt is the fixed cycles prefix length.Main broadcast channel is positioned at the adjacent position before the second portion.Wherein, the shared OFDM symbol of main broadcast channel includes the normal cyclic prefix length information.Different with the frame structure in described in the embodiment three is that main broadcast channel and auxiliary synchronization channel are adjacent.
Terminal equipment at first captures primary synchronization channel P-SCH in connecting system, realize Time and Frequency Synchronization fast.Then, again according to said fixed cycles prefix length, and the length of the shared OFDM symbol of auxiliary synchronization channel, navigate to auxiliary synchronization channel, obtain cell ID.Then, utilize the length and the corresponding fixed cycles prefix length of auxiliary synchronization channel of the shared OFDM symbol of main broadcast channel again, navigate to main broadcast channel.Through the main broadcast channel of decoding, obtain information such as system bandwidth, normal cyclic prefix length.Through said normal cyclic prefix length, and the length of the shared OFDM symbol of auxilliary broadcast channel, navigate to auxilliary position of broadcast channel.At last, the said auxilliary broadcast channel of decoding obtains the sector special parameter.
Embodiment six
As shown in Figure 7, the first in leading subframe comprises a main broadcast channel, an auxilliary broadcast channel, and said auxilliary broadcast channel takies a plurality of OFDM symbols; Second portion comprises a primary synchronization channel and an auxiliary synchronization channel, and primary synchronization channel is positioned at before the auxiliary synchronization channel.Main broadcast channel, auxilliary broadcast channel adopts normal cyclic prefix length, and the Cyclic Prefix that primary synchronization channel and auxiliary synchronization channel adopt is the fixed cycles prefix length.Main broadcast channel is positioned at the adjacent position before the second portion.Wherein, the shared OFDM symbol of main broadcast channel includes the normal cyclic prefix length information.
So like this, terminal equipment at first captures primary synchronization channel in connecting system, realize Time and Frequency Synchronization fast.Then, according to the shared OFDM symbol numbers and the corresponding fixed cycles prefix length of auxiliary synchronization channel of said primary synchronization channel, navigate to auxiliary synchronization channel again, obtain cell ID.
Then, utilize the corresponding fixed cycles prefix length of auxiliary synchronization channel again, and the length and the corresponding fixed cycles prefix length thereof of the shared OFDM symbol of primary synchronization channel, navigate to main broadcast channel.Through the main broadcast channel of decoding, obtain information such as system bandwidth, normal cyclic prefix length.Through said normal cyclic prefix length; And the length and the corresponding fixed cycles prefix length thereof of the shared OFDM symbol of the length of the shared OFDM symbol of primary synchronization channel and corresponding fixed cycles prefix length, auxiliary synchronization channel thereof, navigate to auxilliary position of broadcast channel.At last, the said auxilliary broadcast channel of decoding obtains the sector special parameter.
In addition, embodiments of the invention also provide the localization method of broadcast channel in other a kind of ofdm system.As shown in Figure 8, the described method of embodiments of the invention comprises the steps:
T1: the shared OFDM symbol of the main broadcast channel of part time slot in the said ofdm system, adjacent with synchronizing channel, and be positioned at after the said synchronizing channel;
T2: the shared OFDM symbol of said main broadcast channel adopts the fixed cycles prefix length;
T3: through said fixed cycles prefix length, the length of the OFDM symbol that said synchronizing channel is shared, and the position of said main broadcast channel and synchronizing channel relation are confirmed the position of the OFDM symbol that main broadcast channel is shared.
Embodiments of the invention; Because the main broadcast channel in the part time slot among the OFDM; Be positioned at synchronizing channel adjacent position afterwards, the shared OFDM symbol of main broadcast channel adopts the fixed cycles prefix length, and the fixed cycles prefix length is known for terminal equipment.Therefore, after the length that has obtained the shared OFDM symbol of synchronizing channel, utilize said fixed cycles prefix length, and the adjacent position of main broadcast channel and synchronizing channel relation, just can confirm the position that main broadcast channel belongs to.Therefore, utilize embodiments of the invention, can navigate to the position of broadcast channel place OFDM symbol fast, improved the performance of system acquisition.
Different with embodiment shown in Figure 1 is, among this embodiment, main broadcast channel is to be positioned at adjacent position after the synchronizing channel.Therefore, for the correct main position of broadcast channel that identifies, must make its circulating prefix-length adopt fixing circulating prefix-length.
Equally, below respectively with various embodiment, be example with the conductor frame, first and second portion in said subframe are described, when comprising broadcasting or the synchronizing channel of varying number and kind, the detailed process of embodiments of the invention.
Embodiment seven
As shown in Figure 9, the first in leading subframe comprises a main broadcast channel, an auxilliary broadcast channel, and said auxilliary broadcast channel takies a plurality of OFDM symbols, is positioned at after the shared OFDM symbol of main broadcast channel; Second portion comprises a primary synchronization channel and an auxiliary synchronization channel, and primary synchronization channel is positioned at before the auxiliary synchronization channel.Auxiliary synchronization channel, main broadcast channel adopt the fixed cycles prefix length, and the Cyclic Prefix that primary synchronization channel and auxilliary broadcast channel adopt is a normal cyclic prefix length.Main broadcast channel is positioned at the adjacent position after the second portion.Wherein, the shared OFDM symbol of main broadcast channel includes the normal cyclic prefix length information.
Terminal equipment at first captures primary synchronization channel in connecting system, realize Time and Frequency Synchronization fast.Then, according to the fixed cycles prefix length of said auxiliary synchronization channel, the OFDM symbol lengths that primary synchronization channel is shared navigates to auxiliary synchronization channel again, obtains cell ID.
Then, utilize the length and the corresponding circulating prefix-length of main broadcast channel of the shared OFDM symbol of auxiliary synchronization channel again, navigate to main broadcast channel.Through the main broadcast channel of decoding, obtain information such as system bandwidth, normal cyclic prefix length.Through said normal cyclic prefix length, and the length of the shared OFDM symbol of main broadcast channel, navigate to auxilliary position of broadcast channel.At last, the said auxilliary broadcast channel of decoding obtains the sector special parameter.
Embodiment eight
Shown in figure 10, the first in leading subframe comprises a main broadcast channel, an auxilliary broadcast channel, and said auxilliary broadcast channel takies a plurality of OFDM symbols, is positioned at after the shared OFDM symbol of main broadcast channel; Second portion comprises a primary synchronization channel and an auxiliary synchronization channel, and primary synchronization channel is positioned at after the auxiliary synchronization channel.Main broadcast channel, primary synchronization channel adopt the fixed cycles prefix length, and the Cyclic Prefix that auxilliary broadcast channel and auxiliary synchronization channel adopt is a normal cyclic prefix length.Main broadcast channel is positioned at the adjacent position after the second portion.Wherein, the shared OFDM symbol of main broadcast channel includes the normal cyclic prefix length information.
Terminal equipment at first captures primary synchronization channel in connecting system, realize Time and Frequency Synchronization fast.Then, utilize the length of the shared OFDM symbol of auxiliary synchronization channel again, and the fixed cycles prefix length of primary synchronization channel, navigate to auxiliary synchronization channel, obtain cell ID.Then, utilize the length of the shared OFDM symbol of auxiliary synchronization channel, and the length and the circulating prefix-length thereof of the shared OFDM symbol of primary synchronization channel, and the circulating prefix-length of main broadcast channel, navigate to main broadcast channel.Through the main broadcast channel of decoding, obtain information such as system bandwidth, normal cyclic prefix length.Through said normal cyclic prefix length, and the length of the shared OFDM symbol of main broadcast channel, navigate to auxilliary position of broadcast channel.At last, the said auxilliary broadcast channel of decoding obtains the sector special parameter.
Embodiment nine
Shown in figure 11, the first in leading subframe comprises a main broadcast channel, an auxilliary broadcast channel, and said auxilliary broadcast channel takies a plurality of OFDM symbols, is positioned at after the shared OFDM symbol of main broadcast channel; Second portion comprises a primary synchronization channel.Primary synchronization channel and auxilliary broadcast channel adopt normal cyclic prefix length, and the Cyclic Prefix that main broadcast channel adopts is a normal cyclic prefix length.Main broadcast channel is positioned at the adjacent position after the second portion.Wherein, the shared OFDM symbol of main broadcast channel includes the normal cyclic prefix length information.
Terminal equipment at first captures primary synchronization channel in connecting system, realize Time and Frequency Synchronization fast, obtains cell ID.Then, utilize the length of the shared OFDM symbol of primary synchronization channel again, and the fixed cycles prefix length of main broadcast channel, navigate to main broadcast channel.Through the main broadcast channel of decoding, obtain information such as system bandwidth, normal cyclic prefix length.Through said normal cyclic prefix length, and the length of the shared OFDM symbol of main broadcast channel, navigate to auxilliary position of broadcast channel.At last, the said auxilliary broadcast channel of decoding obtains the sector special parameter.
Can draw through the above embodiments, the frame structure of said subframe is not limited to above-mentioned several kinds of enumerating.But no matter frame structure how, its principle is identical.
In addition, embodiments of the invention also provide the positioner of broadcast channel in a kind of ofdm system.
Shown in figure 12, the said device of the embodiment of the invention comprises: first receiving element and first positioning unit.Wherein,
First receiving element is used for receiving the time slot of ofdm system, and the center is divided and comprised a main broadcast channel in the time slot at least, and synchronizing channel;
First positioning unit; Be used for through the preset synchronizing channel fixed cycles prefix length of said part time slot; The length of the shared OFDM symbol of synchronizing channel and the position of main broadcast channel and synchronizing channel concern, confirm the position of the OFDM symbol that main broadcast channel is shared.
Embodiments of the invention; Preset in the part that first positioning unit utilizes first receiving element to be received; Synchronizing channel fixed cycles prefix length; The length of the shared OFDM symbol of synchronizing channel and the position of main broadcast channel and synchronizing channel relation just can be confirmed the position at main broadcast channel place, thereby avoid the low problem of system acquisition performance in the prior art.Therefore, utilize embodiments of the invention, can navigate to the position of broadcast channel place OFDM symbol fast, improved the performance of system acquisition.
In addition, shown in figure 11, the described device of the embodiment of the invention also comprises:
First resolution unit, the main broadcast channel that is used to decode obtains said normal cyclic prefix length;
Second positioning unit is used for according to said normal cyclic prefix length, and the position of the shared OFDM symbol of said auxilliary broadcast channel, confirms the position of the OFDM symbol that said auxilliary broadcast channel is shared.
When adopting embodiment one to embodiment six described frame structures, the operation principle of the said device of the embodiment of the invention is identical with the principle of method embodiment, repeats no more at this.
In addition, embodiments of the invention also provide the positioner of broadcast channel in a kind of ofdm system.
Shown in figure 13, the described device of the embodiment of the invention comprises: the second sub-frame division unit and the 3rd positioning unit.Wherein,
Second receiving element is used for receiving the time slot of ofdm system, comprises a main broadcast channel in the part time slot at least, and synchronizing channel;
The 3rd positioning unit; Be used for fixed cycles prefix length through the preset main broadcast channel of part time slot; The length of the shared OFDM symbol of synchronizing channel and the position of main broadcast channel and synchronizing channel concern, confirm the position of the OFDM symbol that main broadcast channel is shared.
Embodiments of the invention; Preset in the part that the 3rd positioning unit utilizes second receiving element to be received; The fixed cycles prefix length of main broadcast channel; The length of the shared OFDM symbol of synchronizing channel and the position of main broadcast channel and synchronizing channel relation just can be confirmed the position at main broadcast channel place in the first, thereby avoid the low problem of system acquisition performance in the prior art.Therefore, utilize embodiments of the invention, can navigate to the position of broadcast channel place OFDM symbol fast, improved the performance of system acquisition.
In addition, the described device of embodiments of the invention also comprises:
Second resolution unit, the main broadcast channel that is used to decode obtains said normal cyclic prefix length;
The 4th positioning unit is used for according to said normal cyclic prefix length, and the position of the shared OFDM symbol of said auxilliary broadcast channel, confirms the position of the OFDM symbol that said auxilliary broadcast channel is shared.
When adopting embodiment seven to embodiment nine described frame structures, the operation principle of the said device of the embodiment of the invention is identical with the principle of method embodiment, repeats no more at this.
At last, embodiments of the invention also provide the navigation system of broadcast channel in a kind of ofdm system.
Like Figure 14, the navigation system of broadcast channel in the embodiments of the invention ofdm system comprises: base station unit, and terminal equipment;
Wherein, said base station unit comprises:
The frame division unit is used for the part time slot of ofdm system is divided at least two parts, and wherein first comprises a main broadcast channel at least, and second portion comprises a synchronizing channel at least;
The position is provided with the unit, is used to set the shared OFDM symbol of said main broadcast channel, is positioned at the adjacent position before or after the shared OFDM symbol of second portion;
Definition unit is used to set the shared OFDM symbol of second portion and adopts the fixed cycles prefix length or set the shared OFDM symbol employing fixed cycles prefix length of said main broadcast channel;
Transmitting element is used for sending the part time slot of ofdm system;
Described terminal equipment comprises:
Receiving element is used for receiving the part time slot of ofdm system;
Search unit is used for searching the synchronizing channel of the part time slot of said ofdm system;
Positioning unit is used for through said fixed cycles prefix length, and the position of the OFDM symbol that main broadcast channel is shared is confirmed in the position of the shared OFDM symbol of synchronizing channel.
After the receiving element of terminal equipment is received said subframe, at first confirm the position of synchronizing channel by search unit.Then, according to front embodiment one to nine described different sub frame structure, according to various subframe structures, navigate to the position of the shared OFDM symbol of main broadcast channel by positioning unit.
Utilize the described system of the embodiment of the invention, can navigate to the position of broadcast channel place OFDM symbol fast, improved the performance of system acquisition.
Certainly; Embodiments of the invention also can have a variety of; Under the situation that does not deviate from embodiments of the invention spirit and essence thereof; Those skilled in the art work as can make various corresponding changes and distortion according to embodiments of the invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of embodiments of the invention.
Claims (22)
1. the localization method of broadcast channel in the ofdm system is characterized in that described method comprises the steps:
The shared OFDM symbol of the main broadcast channel of part time slot is adjacent with synchronizing channel in the said ofdm system, and is positioned at before the said synchronizing channel;
The shared OFDM symbol of said synchronizing channel adopts the fixed cycles prefix length;
Through said fixed cycles prefix length, the length of the shared OFDM symbol of synchronizing channel, and the position of said main broadcast channel and synchronizing channel relation are confirmed the position of the OFDM symbol that main broadcast channel is shared.
2. the localization method of broadcast channel is characterized in that in the ofdm system according to claim 1, and said synchronizing channel is a primary synchronization channel.
3. the localization method of broadcast channel is characterized in that in the ofdm system according to claim 1 and 2, and the shared OFDM symbol of said main broadcast channel includes the normal cyclic prefix length information.
4. the localization method of broadcast channel is characterized in that in the ofdm system according to claim 3, also comprises an auxiliary synchronization channel in the said time slot at least.
5. the localization method of broadcast channel in the ofdm system according to claim 4; It is characterized in that; Said through said fixed cycles prefix length; The length of the shared OFDM symbol of synchronizing channel, and the position of said main broadcast channel and synchronizing channel relation, confirm that the step of the position of the OFDM symbol that main broadcast channel is shared comprises:
Through said fixed cycles prefix length, and the length of the shared OFDM symbol of said primary synchronization channel is confirmed the position of said auxiliary synchronization channel; Through the length and the corresponding fixed cycles prefix length and the corresponding fixed cycles prefix length of primary synchronization channel of auxiliary synchronization channel of the shared OFDM symbol of primary synchronization channel, locate the position of the shared OFDM symbol of main broadcast channel;
Perhaps
Through said fixed cycles prefix length, and the length of the shared OFDM symbol of said auxiliary synchronization channel is confirmed the position of said auxiliary synchronization channel; Through the length and the corresponding fixed cycles prefix length of auxiliary synchronization channel of the shared OFDM symbol of auxiliary synchronization channel, locate the position of the shared OFDM symbol of main broadcast channel.
6. the localization method of broadcast channel is characterized in that in the ofdm system according to claim 3, also comprises an auxilliary broadcast channel in the said time slot at least.
7. the localization method of broadcast channel in the ofdm system according to claim 6; It is characterized in that;, said through said fixed cycles prefix length, the length of the shared OFDM symbol of synchronizing channel; And the position of said main broadcast channel and synchronizing channel relation, confirm also to comprise after the step of position of the OFDM symbol that main broadcast channel is shared:
The main broadcast channel of decoding obtains said normal cyclic prefix length;
According to said normal cyclic prefix length, and the length of the shared OFDM symbol of said auxilliary broadcast channel, confirm the position of the OFDM symbol that said auxilliary broadcast channel is shared.
8. the localization method of broadcast channel in the ofdm system is characterized in that described method comprises the steps:
The shared OFDM symbol of the main broadcast channel of part time slot is adjacent with synchronizing channel in the said ofdm system, and is positioned at after the said synchronizing channel;
The shared OFDM symbol of said main broadcast channel adopts the fixed cycles prefix length;
Through said fixed cycles prefix length, the length of the OFDM symbol that said synchronizing channel is shared, and the position of said main broadcast channel and synchronizing channel relation are confirmed the position of the OFDM symbol that main broadcast channel is shared.
9. the localization method of broadcast channel is characterized in that in the ofdm system according to claim 8, and said synchronizing channel is a primary synchronization channel.
10. the localization method of broadcast channel is characterized in that in the ofdm system according to claim 9, and described primary synchronization channel adopts normal cyclic prefix length;
Said through said fixed cycles prefix length, and the length of the shared OFDM symbol of said synchronizing channel confirms that the position of the OFDM symbol that main broadcast channel is shared is specially:
Utilize the shared OFDM symbol lengths of said primary synchronization channel, and said fixed cycles prefix length, confirm said main position of broadcast channel.
11. the localization method of broadcast channel is characterized in that in the ofdm system according to claim 9, also comprises an auxiliary synchronization channel in the said time slot at least.
12. the localization method of broadcast channel is characterized in that in the ofdm system according to claim 11,
When said primary synchronization channel was positioned at before the said auxiliary synchronization channel, said primary synchronization channel adopted normal cyclic prefix length, and said auxiliary synchronization channel adopts the fixed cycles prefix length;
When said primary synchronization channel was positioned at after the said auxiliary synchronization channel, said primary synchronization channel adopted the fixed cycles prefix length, and said auxiliary synchronization channel adopts normal cyclic prefix length.
13. the localization method of broadcast channel in the ofdm system according to claim 12; It is characterized in that; When said primary synchronization channel is positioned at before the said auxiliary synchronization channel, said through said fixed cycles prefix length, the length of the OFDM symbol that said synchronizing channel is shared; And the position of said main broadcast channel and synchronizing channel relation, confirm that the step of the position of the OFDM symbol that main broadcast channel is shared is specially:
Through the length of the shared OFDM symbol of said primary synchronization channel, and the fixed cycles prefix length of auxiliary synchronization channel is confirmed the position of said auxiliary synchronization channel;
The fixed cycles prefix length that length through the shared OFDM symbol of auxiliary synchronization channel and main broadcast channel are corresponding is located the position of the shared OFDM symbol of main broadcast channel.
14. the localization method of broadcast channel in the ofdm system according to claim 12; It is characterized in that; When said primary synchronization channel is positioned at after the said auxiliary synchronization channel, said through said fixed cycles prefix length, the length of the OFDM symbol that said synchronizing channel is shared; And the position of said main broadcast channel and synchronizing channel relation, confirm that the step of the position of the OFDM symbol that main broadcast channel is shared is specially:
Through the fixed cycles prefix length of said primary synchronization channel, and the length of the shared OFDM symbol of said auxiliary synchronization channel is confirmed the position of said auxiliary synchronization channel;
Through the length of the shared OFDM symbol of auxiliary synchronization channel, the length of the shared OFDM symbol of primary synchronization channel and corresponding fixed cycles prefix length are located the position of the shared OFDM symbol of main broadcast channel.
15. the localization method of broadcast channel is characterized in that in the ofdm system according to claim 11, also comprises an auxilliary broadcast channel in the said time slot at least.
16. the localization method of broadcast channel in the ofdm system according to claim 15; It is characterized in that; Said through said fixed cycles prefix length; The length of the OFDM symbol that said synchronizing channel is shared, and the position of said main broadcast channel and synchronizing channel relation, confirm also to comprise after the step of position of the OFDM symbol that main broadcast channel is shared:
The main broadcast channel of decoding obtains said normal cyclic prefix length;
According to said normal cyclic prefix length, and the length of the shared OFDM symbol of said auxilliary broadcast channel, confirm the position of the OFDM symbol that said auxilliary broadcast channel is shared.
17. the positioner of broadcast channel in the ofdm system is characterized in that said device comprises:
First receiving element is used for receiving the time slot of ofdm system, and the center is divided and comprised a main broadcast channel in the time slot at least, and synchronizing channel;
First positioning unit; Be used for through the preset synchronizing channel fixed cycles prefix length of said part time slot; The length of the shared OFDM symbol of synchronizing channel and the position of main broadcast channel and synchronizing channel concern, confirm the position of the OFDM symbol that main broadcast channel is shared.
18. the positioner of broadcast channel is characterized in that in the ofdm system according to claim 17, said device also comprises:
First resolution unit, the main broadcast channel that is used to decode obtains normal cyclic prefix length;
Second positioning unit is used for according to said normal cyclic prefix length, and the length of the shared OFDM symbol of auxilliary broadcast channel, confirms the position of the OFDM symbol that said auxilliary broadcast channel is shared.
19. the positioner of broadcast channel in the ofdm system is characterized in that said device comprises:
Second receiving element is used for receiving the time slot of ofdm system, and the center is divided and comprised a main broadcast channel in the time slot at least, and synchronizing channel;
The 3rd positioning unit; Be used for fixed cycles prefix length through the preset main broadcast channel of said part time slot; The length of the shared OFDM symbol of synchronizing channel and the position of main broadcast channel and synchronizing channel concern, confirm the position of the OFDM symbol that main broadcast channel is shared.
20. the positioner of broadcast channel is characterized in that in the ofdm system according to claim 19, said device also comprises:
Second resolution unit, the main broadcast channel that is used to decode obtains normal cyclic prefix length;
The 4th positioning unit is used for according to said normal cyclic prefix length, and the length of the shared OFDM symbol of auxilliary broadcast channel, confirms the position of the OFDM symbol that said auxilliary broadcast channel is shared.
21. the navigation system of broadcast channel is characterized in that said system comprises: base station unit, and terminal equipment in the ofdm system;
Wherein, said base station unit comprises:
The position is provided with the unit, is used for the OFDM symbol that the main broadcast channel of said ofdm system part time slot is shared, is arranged to adjacently with synchronizing channel, and is positioned at before the said synchronizing channel;
Definition unit is used to set the shared OFDM symbol of synchronizing channel and adopts the fixed cycles prefix length or set the shared OFDM symbol employing fixed cycles prefix length of said main broadcast channel;
Described terminal equipment comprises:
Search unit is used for searching the synchronizing channel of the part time slot of said ofdm system;
Positioning unit is used for through said fixed cycles prefix length, and the length of the shared OFDM symbol of synchronizing channel, and synchronizing channel and main position of broadcast channel relation are confirmed the position of the OFDM symbol that main broadcast channel is shared.
22. the navigation system of broadcast channel is characterized in that in the ofdm system according to claim 21, said base station unit also comprises:
Transmitting element is used for the time slot to terminal equipment transmission ofdm system;
Said terminal equipment also comprises:
Receiving element is used for receiving the time slot of ofdm system.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1578294A (en) * | 2003-07-08 | 2005-02-09 | 三星电子株式会社 | Method and device for detecting synchronous signal |
| CN1691659A (en) * | 2004-04-23 | 2005-11-02 | 北京三星通信技术研究有限公司 | A method for synchronization in OFDM system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1578294A (en) * | 2003-07-08 | 2005-02-09 | 三星电子株式会社 | Method and device for detecting synchronous signal |
| CN1691659A (en) * | 2004-04-23 | 2005-11-02 | 北京三星通信技术研究有限公司 | A method for synchronization in OFDM system |
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