CN101489286B - Broadcast signal transmitting method and apparatus in wireless communication network - Google Patents
Broadcast signal transmitting method and apparatus in wireless communication network Download PDFInfo
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- CN101489286B CN101489286B CN2008100326566A CN200810032656A CN101489286B CN 101489286 B CN101489286 B CN 101489286B CN 2008100326566 A CN2008100326566 A CN 2008100326566A CN 200810032656 A CN200810032656 A CN 200810032656A CN 101489286 B CN101489286 B CN 101489286B
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Abstract
The present invention provides a method which is used for transmitting broadcast signal in a transmitter of network device of wireless communication network and a device thereof, and a method which is used for processing the received broadcast signal in a receiver of network device of wireless communication network and a device thereof, wherein, through using the circulating prefix which has different length with the single-broadcast signal and/or pilot signal with different density for the broadcast signal, the defect that all signals use the circulating prefix with same length and pilot signal with same density in prior art, thereby realizing optimized balancing between spectrum utilization and communication performance.
Description
Technical field
The present invention relates to wireless communication system, relate in particular to the method and the device that in transmitter, are used to send broadcast singal, and in receiver, be used for method and device that the broadcast singal that receives is handled.
Background technology
Current, multi-carrier modulation technology has been widely used in wireless communication field, for example orthogonal frequency division multiplexi (OFDM) and OFDMA technology (OFDMA) etc.Because multi-carrier modulation technology has the ability of very strong anti-narrow band interference and anti-multipath decline, and on each subcarrier, also has flat fading characteristic, adopts the receiver of this kind technology to have simple complexity of equalization.Similarly, being referred to as technological single-carrier frequency division multiple access (SC-FDMA) system (being called DFT-expansion ofdm system again) of OFDM class with OFDM, OFDM also is a kind of advanced person's wireless transmission scheme.OFDM class technology is widely used in the high-data-rate wireless communication system; The for example fusion of wireless lan (wlan)/Wireless Fidelity (Wi-Fi) and wireless MAN/micro-wave access global inter communication technology (WiMAX) becomes the popular candidate technologies of 3G Long Term Evolution (LTE) air interface.Hereinafter, the OFDM symbol in the ofdm system, OFDMA symbol and the SC-FDMA symbol in the SC-FDMA system in the OFDMA system are referred to as the OFDM/A symbol.
In existing wireless communication system based on multi-carrier modulation, a physical transfer frame typically is the minimum transmission units with some OFDM/A symbol, and is as shown in Figure 1.Shown in the frame structure; Leading (Preamble) that be made up of an OFDM/A symbol and a CP (Cyclic Prefix) is positioned at frame head so that carry out time synchronized; The CP that each OFDM/A symbol is added has unified length, and the distribution of pilot signal (Pilot) is uniform.Wherein, be labeled as 51 be pilot frequency carrier wave (being used to carry the subcarrier of pilot signal), all the other then are data carrier (being used to carry the subcarrier that data are non-carrier signal).
Usually, the length of CP should be grown to avoid intersymbol interference (ISI, Inter-Symbol Interference) as far as possible, and simultaneously, as a kind of redundancy that does not comprise useful information, CP is short in as far as possible again to realize high frequency band efficient.Generally speaking, the length of CP equals the maximum delay expansion of wireless channel.In addition, pilot frequency carrier wave in the frequency domain should satisfy sampling theorem at interval, and promptly pilot frequency carrier wave at interval should be greater than the correlation bandwidth of wireless channel, and correlation bandwidth generally equals the inverse of wireless channel time delay expansion (delay spread).Like this, just can utilize the method for frequency domain interpolation contiguous channel to be estimated, know the channel frequency response that does not have the OFDM/A of pilot signal symbol based on pilot signal.
Shown in Figure 2 is a simple cordless communication network sketch map; Wherein, for unicast signal, when the base station conduct is made a start; Because base station A, B, C sends independently of one another and the frequency reuse rate is low; Therefore, especially when portable terminal D is positioned at cell edge, its receiver can receive the interference from the signal of base station B, C when receiving the signal that certain certain base station such as base station A ' send.Because presence of intercell interference (ICI) is usually greater than the noise jamming in the system, so the reception of unicast signal mainly is subject to presence of intercell interference.
For broadcast singal; Downlink broadcast signal from core net is published to relevant a plurality of base station A, B and C through radio access network controller (WANC); By these base stations above-mentioned broadcast singal is sent again,, only need carry out simple radio frequency and merge at the receiver place of portable terminal D.It is thus clear that in broadcast singal sent, because the signal that different base station sent is identical, its signal received and mainly receives noise but not the restriction of presence of intercell interference.But; Because a plurality of base stations of transmission broadcast singal are different with the distance between the portable terminal; Broadcast singal from base station far away causes bigger broadcast radio channel time delay expansion; Therefore, compare with unicast signal, broadcast singal needs bigger Cyclic Prefix of length and littler pilot signal of carrier spacing usually.
In fact, frame structure of the prior art (for example shown in Figure 1) is not distinguished unicast signal and broadcast singal, that is, each the OFDM/A symbol in the frame has the Cyclic Prefix and the uniform pilot interval of unified length.In such prior art, if come the length of design cycle prefix specially to broadcast singal, then this Cyclic Prefix will be longer than the needed Cyclic Prefix of unicast signal, will cause the availability of frequency spectrum lower when such frame structure is applied to unicast signal transmission; On the contrary; If special length of coming the design cycle prefix to unicast signal; Then this Cyclic Prefix will be shorter than the needed Cyclic Prefix of broadcast singal, and such frame structure will cause circulating prefix-length to be expanded less than time delay when being applied to the broadcast singal transmission, make communication performance obviously reduce.For example, in the WiMAX network, according to the expansion of the time delay of maximum, the length of CP can be an OFDM symbol lengths 1/4,1/8,1/16 in addition littler.But in case a CP length has been selected in the base station, then this base station will can be not that unicast signal or broadcast singal are adjusted according to signal to be sent.Similarly, if pilot frequency carrier wave is to design to unicast signal specially at interval, then because therebetween at a distance from bigger, the precision of channel estimation of acquisition is very low to broadcast singal; On the contrary, if pilot frequency carrier wave is to design to broadcast singal specially at interval,, wasted too many pilot signal undoubtedly though then it also can be applicable to unicast signal.
Summary of the invention
To the problems referred to above that exist in the prior art; One object of the present invention is; A kind of new dynamic subframe reorganization scheme of efficient multiplexing physical layer that is used for clean culture and broadcast service is provided; This scheme considered unicast signal is expanded with the different time delay that broadcast singal is faced owing to different multidiameter fading channels, for clean culture, broadcast singal provide CP with appropriate length and the pilot signal with appropriate interval.In addition, also should guarantee higher channel efficiency at the same time, balance precision of channel estimation and pilot tone cost.
For realizing above-mentioned purpose; According to a first aspect of the invention; The method that is used to send broadcast singal in a kind of transmitter of the network equipment at cordless communication network is provided, has it is characterized in that, may further comprise the steps: b. sends with first send mode and the corresponding signal of broadcast singal receives supplementary; Wherein, said first send mode is different from and is used to send and the corresponding signal of unicast signal receives the second used send mode of supplementary.
According to a second aspect of the invention; Provide and be used for method that the broadcast singal from broadcast source that receives is handled in a kind of receiver of the network equipment at cordless communication network; It is characterized in that; May further comprise the steps: A. handles the broadcast singal that receives with first processing mode; Wherein, said first processing mode is different from second processing mode that the unicast signal that receives is handled, and sends and the first used send mode of the corresponding signal reception supplementary of said broadcast singal corresponding to said broadcast source place.
According to a third aspect of the invention we; The broadcaster that is used to send broadcast singal in a kind of transmitter of the network equipment at cordless communication network is provided; It is characterized in that, comprising: broadcast transmitting device is used for sending and the corresponding signal reception of broadcast singal supplementary with first send mode; Wherein, said first send mode is different from and is used to send and the corresponding signal of unicast signal receives the second used send mode of supplementary.
According to a forth aspect of the invention; Provide and be used for broadcast processing apparatus that the broadcast singal from broadcast source that receives is handled in a kind of receiver of the network equipment at cordless communication network; It is characterized in that, comprising: first processing unit is used for first processing mode broadcast singal that receives being handled; Wherein, said first processing mode is different from second processing mode that the unicast signal that receives is handled.
The present invention is through using and the Cyclic Prefix of unicast signal different length and/or the pilot signal of different densities for broadcast singal; Overcome in the prior art defective of pilot signal of all signals being used Cyclic Prefix, the equal densities of equal length, thereby between the availability of frequency spectrum and communication performance, realized the balance of optimizing.
Description of drawings
Through reading the detailed description of non-limiting example being done with reference to following accompanying drawing, it is more obvious that other features, objects and advantages of the present invention will become:
Fig. 1 shows the structural representation according to a physical transfer frame of prior art;
Fig. 2 is the sketch map of a cordless communication network;
Fig. 3 shows according to the broadcast signal transmission method system flow chart in the cordless communication network of embodiment of the present invention;
Fig. 4 is for being used to carry out the transmitter sketch map of broadcast singal transmission in the cordless communication network according to embodiment of the present invention;
Fig. 5 is for being used to carry out the receiver sketch map of broadcast singal transmission in the cordless communication network according to embodiment of the present invention;
Fig. 6 a is the frame structure sketch map according to a specific embodiment of the present invention;
Fig. 6 b is the frame structure sketch map according to a specific embodiment of the present invention;
Fig. 7 a, Fig. 7 b are pilot frequency design sketch map according to a particular embodiment of the invention;
Fig. 8 is the broadcaster block diagram that in the transmitter of the network equipment of cordless communication network, is used to send broadcast singal according to an embodiment of the present invention;
Fig. 9 is for being used for broadcast processing apparatus that the broadcast singal from broadcast source that receives is handled according to an embodiment of the present invention in the receiver of the network equipment of cordless communication network;
Figure 10 is the performance comparison sketch map of the wireless signal signal to noise ratio/Block Error Rate under the present invention and the prior art.
Embodiment
For ease of understanding, following to the concept explanation that wherein occurs to hereinafter:
Hereinafter, the ground that is without loss of generality is that the present invention will be described for example with the OFDM type systematic based on OFDM class technology.It will be apparent to those skilled in the art that; Because thought of the present invention is broadcast singal is used special cyclic prefix and/or pilot density; Therefore; The present invention includes but not limited to the OFDM type systematic applicable to any system that need send pilot tone and/or needs use Cyclic Prefix for broadcasting, unicast signal respectively.
Existing downlink frame structure in the OFDM type systematic also can be expressed as form shown in the table 1:
Existing downlink frame structure in the table 1:OFDM type systematic
| Parameter | Value |
| The OFDM/A symbol quantity | M |
| The quantity of an OFDM/A symbol sub-carriers | N |
| The quantity of the subcarrier that is used in OFDM/A symbol | N used |
| The quantity of the OFDM/A symbol that is used to broadcast | M b |
| The length of Cyclic Prefix | CP u |
| The quantity of pilot signal in OFDM/A symbol | P b |
It is thus clear that no matter an OFDM/A symbol is used to transmit unicast signal or broadcast singal, the length that is attached to this OFDM/A symbol Cyclic Prefix before is a steady state value CP
u, and the pilot signal quantity in this OFDM/A symbol also is a steady state value P
b
After introducing the present invention, an example of downlink frame structure is as shown in table 2:
Table 2: the downlink frame topology example in the OFDM type systematic behind introducing the present invention
| Parameter | Value |
| The quantity of OFDM/A symbol | M |
| The quantity of an OFDM/A symbol sub-carriers | N |
| The quantity of the subcarrier that is used in OFDM/A symbol | N used |
| The quantity of the OFDM/A symbol that is used to broadcast | M b |
| The length that is used for the Cyclic Prefix of broadcast singal | CP b |
| The length that is used for the Cyclic Prefix of unicast signal | CP u |
| A quantity that is used for the OFDM/A symbol pilot signal of broadcast singal | P b |
| A quantity that is used for the OFDM/A symbol pilot signal of unicast signal | P u |
Be not difficult to find that core concept of the present invention is that (burst, additional one of OFDM/A symbol burst) has the first length (CP in order to be used for broadcast singal through the comparison sheet 1 and the content of table 2
b) Cyclic Prefix, and add at the OFDM/A symbol that is used for broadcast singal and to have first density (P in each OFDM/A symbol
bIndividual) pilot signal.According to a preferred embodiment of the present invention, CP
b＞CP
uAnd P
b＞P
uThis meets clean culture, broadcast singal characteristic usually, because the length of Cyclic Prefix generally equals the time delay expansion of wireless channel, and broadcast singal is compared with unicast signal, has bigger time delay expansion; And; The carrier spacing of pilot signal generally should be greater than the correlation bandwidth of wireless channel; And correlation bandwidth generally equals the inverse of the time delay expansion of wireless channel, and broadcast singal is compared with unicast signal, has bigger time delay expansion usually; Therefore its correlation bandwidth is less, and the carrier spacing is also just less and pilot signal density is bigger.
Fig. 3 shows according to the broadcast signal transmission method system flow chart in the cordless communication network of embodiment of the present invention; It will be apparent to those skilled in the art that; It is convenient that ordinal relation between each step wherein is merely statement, but not to the restriction of protection range of the present invention.Fig. 4, Fig. 5 then are respectively the transmitter and receiver sketch map that is used to carry out the broadcast singal transmission in the cordless communication network according to embodiment of the present invention.Wherein, In flow chart shown in Figure 3; For for simplicity, omitted not step very closely of some and flesh and blood of the present invention relation, and put it into the specification word segment and detail; To those skilled in the art, above-mentioned omission can not constitute any influence to it on embodiment of the present invention.
Below, with reference to Fig. 3 and combine Fig. 2, Fig. 4, Fig. 5 to come the present invention to be detailed from system perspective.Wherein, sending the downlink broadcast signal with the base station A among Fig. 2 to portable terminal D is example.
In the transmitter at A place, base station as shown in Figure 4, at MAC (media interviews control) layer, scheduler is that broadcast singal distributes special connection identifier (CID, and being used to identify this signal is broadcast singal.In addition, based on shown in the table 2, scheduler also comprises M for the broadcasting service signal allocation in each frame
bOther (M-M in the data area of individual OFDM/A symbol, this frame
b) individual OFDM/A symbol then is used for command transmitting and unicast service signal.
See Fig. 3; In step S1; Portable terminal D measures the broadcast channel between itself and the base station A based on lead code or pilot tone, thereby obtains postponing relevant information such as time delay spreading parameter or maximum delay parameter, and this process can realize based on prior art; For example, estimate that according to lead code or pilot tone the channel response that obtains comes directly to obtain said delay relevant information.It will be apparent to those skilled in the art that; The acquisition of said delay relevant information both can initiatively accomplished by portable terminal D; For example; The operation of periodically carrying out the broadcast channel measurement also can sent indication to portable terminal D to obtain postponing relevant information by base station A, and portable terminal D carries out at the place broadcast channel measurement to be triggered by the said indication from base station A with the operation that obtains the delay relevant information.
In step S2, the delay relevant information that portable terminal D will measure reports to base station A.So that the delay relevant information that base station A is reported based on a plurality of broadcast singal receiving terminals that comprise portable terminal D confirm with first length of the corresponding Cyclic Prefix of broadcast singal and with first density of the corresponding pilot signal of broadcast singal.
According to a variant of this specific embodiment, wherein, system promptly confirmed to postpone relevant information in the network planning stage, and in the course of work after this, no longer upgraded.According to this variant, portable terminal D will need not to postpone the measurement of relevant information, thereby said step S2 can omit.
In step S3; Scheduler among the A of base station is confirmed first length to the used Cyclic Prefix of portable terminal D transmission broadcast singal according to the delay relevant information of portable terminal D report, and sends first density of the used pilot signal of broadcast singal to portable terminal D.Typically, base station A confirms first length of said Cyclic Prefix and first density of pilot tone by a mapping table that comprises circulating prefix-length, pilot density and delay relevant information that prestores as shown in table 3.
Table 3: the mapping table signal that base station A prestores
| The i predetermined condition that postpones relevant information | The first length i | The first density i |
| The ii predetermined condition that postpones relevant information | The first length ii | The first density ii |
| The iii predetermined condition that postpones relevant information | The first length iii | The first density iii |
| ... | ... | ... |
| The S predetermined condition that postpones relevant information | The first length S | The first density S |
Based on table 3; When the delay relevant information of portable terminal D report meets wherein some conditions like the i predetermined condition, with the corresponding first length i of i predetermined condition and the first density i be first density of the pilot signal of first length of the selected Cyclic Prefix of doing the broadcast singal that is used to mail to portable terminal D and the being used to broadcast singal that mails to portable terminal D.
According to a specific embodiment of the present invention, the base station A place mapping table as shown in table 3 that can not prestore, the ground that replaces, the scheduler among the A of base station calculates according to specific algorithm, thereby generates first a suitable length and one first density.For example; Select in a plurality of subscriber channel time delay expansion measured values the maximum delay expansion as said first length; Perhaps; Be that broadcast singal adopts the Cyclic Prefix longer than the maximum delay length of wireless channel, for example, the length of maximum delay multiply by a coefficient (for example 1.2) be used as said first length.This belongs to those skilled in the art's common practise, will not give unnecessary details.
According to another specific embodiment of the present invention; Scheduler among the A of base station does not rely on the delay relevant information of portable terminal D feedback and confirms said first length and first density; And be to use the first pre-set length and first density; In the transmission course of down link, the said first pre-set length and first density do not change usually.
In step S4, the information of the original position of first length that base station A will confirm and first density and indication broadcast area sends to portable terminal D via the downlink signaling channel.Wherein, For reducing the expense of signaling channel; Can give different signs for the first different length, first density, and the corresponding relation of prestore at portable terminal D place said sign and corresponding first length, first density, thus; Base station A only needs the said sign of transmission on the downlink signaling channel; In the corresponding relation that prestores, search based on the said sign that base station A sends by portable terminal D again, can know said first length and first density exactly, thereby use it for processing the broadcast singal that receives.
Above-mentioned steps is primarily aimed at the MAC layer operation that carries out in the transmitter, and based on the instruction of MAC layer scheduler, the operation principle of the physical layer transmission model shown in Fig. 4 Lower Half will be described in following steps:
In step S5, base station A judges whether signal to be sent (burst) is broadcast singal, particularly, can carry out said judgement for the CID that this broadcast singal distributed according to scheduler before this.In fact, the broadcasting in the downstream signal to be sent at base station A place, unicast signal possibly be to intert each other, and therefore, through step S5, signal to be sent is sorted is broadcast singal and unicast signal shown in Fig. 4 Lower Half high order end.
After this among the step S6, in physical layer, according to respective coding and modulation scheme, base station A carries out chnnel coding, interweaves and modulates unicast signal and broadcast singal respectively.After subcarrier mapping and IFFT conversion subsequently; Determined first length according to the MAC layer; Base station A is additional Cyclic Prefix with first length before the OFDM/A symbol that is used to broadcast, and to being used for the OFDM/A symbol of clean culture, can be its additional Cyclic Prefix with second length based on prior art; Wherein, said first length is different from and is preferably more than said second length.
In the last framing procedure, the pilot tone pattern that the pilot signal that is used for broadcast singal according to first length and the indication of the CP that is used to broadcast has first density, base station A according to a predefined frame structure at broadcast area reorganization OFDM symbolic construction.In the said downlink frame that generates, the pilot tone of inserting at the OFDM/A symbol that is used for broadcasting has first density, and additional CP with first length is arranged.
It will be apparent to those skilled in the art that; Based on core concept of the present invention; Various used now or in the future can applicable frame structure in the present invention all can be suitable for, be example with a kind of simple frame structure below, wherein; Suppose that all subchannels all are used to transmit broadcast singal in the long frame of 2ms, shown in Fig. 6 a, 6b.Wherein, in structure shown in Fig. 6 a, comprised 8 OFDM/A symbols, structure shown in Fig. 6 b then comprises 7 OFDM/A symbols.Not shown ground, be shown in each OFDM/A symbol to have added density be the pilot signal of first density, each shown CP then has first length.The difference of two kinds of structures shown in Fig. 5 a and the 5b is that the latter takies OFDM/A symbol still less, but each OFDM/A symbol has been endowed longer CP.
The comparison of the pilot signal density of the OFDM/A symbol that is used for broadcasting is discussed in the present invention and the prior art below again.It will be appreciated by those skilled in the art that and have ripe pilot tone placement schemes in the prior art.For example, can whenever insert an OFDM/A symbol that is called frequency pilot sign at a distance from several OFDM/A symbols (being generally a frame), all subchannels in this frequency pilot sign all will be used for channel estimating.Again for example, also can in each OFDM/A symbol, respectively insert several pilot signals, thereby utilize the parton channel in each OFDM/A symbol to carry out channel estimating.The former is called as block pilot tone insertion, and its hypothesis channel satisfies the condition of slow fading; The latter is called as Comb Pilot and inserts, and it can satisfy the situation that channel constantly changes.Again further, the structure of pilot signal can be divided into the pilot configuration of square profile, instructs frequently signal on time domain and frequency domain two directions, all to become to be spacedly distributed; Block pilot configuration refers on time-axis direction, periodically insert pilot signal, and this cycle must be satisfied sampling theorem, and pilot signal has taken all subcarriers on frequency axis; And the Comb Pilot structure, referring on frequency axis, uniformly-spaced insert pilot signal, pilot signal is continuous pectination on time shaft.The present invention can confirm pilot signal as stated above, but is that with the prior art difference the present invention can be presented as specifically that for broadcast singal uses the pilot signal bigger than unicast signal density the insertion of frequency pilot sign or pilot signal is more frequent.
Shown in Fig. 7 a, 7b, according to this example, the present invention reuses pilot frequency design of the prior art, and is that unicast service distributes sparse pilot tone based on prior art, and coming based on the present invention is that broadcasting service is distributed more intensive pilot tone.
Below, refer again to the step S7 shown in Fig. 3, S8 and combine receiver shown in Fig. 5 to come portable terminal D is received the operation behind the signal that base station A sends in step S6.
Corresponding with the framing operation at base station A place, behind a physical transfer frame that receives from base station A, the receiver at portable terminal D place is at first separated the frame operation to it, and this requires portable terminal D to know the frame structure that use in A place, base station.Particularly, base station A can will indicate the indication information of said frame structure to issue portable terminal D with said first length, first density in step S4 before this.Alternatively; Can prestore at the portable terminal D place indication information of the said frame structure of said indication of system; In the term of validity of this frame structure, base station A uses this frame structure to carry out framing operation always, thus guarantee that portable terminal D can be correct it is separated the frame operation.After this frame structure lost efficacy, system upgraded the frame structure that portable terminal D place prestores again.
Through the said frame of separating, the transmission frame that receives is decomposed into unicast signal and broadcast singal.But, be used for also adding CP before the OFDM/A symbol of clean culture, and also adding CP before the OFDM/A symbol that is used to broadcast with first length with second length.Because first length is different with second length; Therefore; Which signal receiver need know is unicast signal; Which signal is a broadcast singal, thereby according to first length of in step S4, knowing before this and preset or come to remove CP exactly for separating the signal that frame obtains with second length of base station A agreement.
So in step S7, whether the OFDM/A symbol that has a CP that portable terminal D judge frame goes out is broadcast singal.The scheduler of MAC layer that particularly, still can be through base station A is that the special CID that broadcast singal is given carries out said judgement.
If the judged result that obtains among the step S7 negates, promptly said OFDM/A symbol is used for unicast signal, and then corresponding second length of basis and unicast signal is come is that it removes CP to portable terminal D; Thereby obtained removing the OFDM/A symbol that is used for clean culture of CP, and then through the FFT conversion, according to pilot frequency design; Carry out the channel estimating of unicast tunnel based on pilot signal with second density; The result of channel estimating is used to the equilibrium treatment of unicast signal, after this, this signal is carried out operations such as demodulation, decoding until obtaining original unicast data according to demodulation, the decoding process of preset unicast signal; Wherein, Said demodulation, decoding process are corresponding with modulation, the coded system at base station A place, and this process belongs to those skilled in the art's common practise, does not repeat them here.
If the judged result that obtains among the step S7 is sure, promptly said OFDM/A symbol is used for broadcast singal, and then portable terminal D will come to remove its CP for this OFDM/A symbol according to first length of knowing among the step S4.Thereby obtained removing the OFDM/A symbol that is used to broadcast of CP.After this, after the FFT conversion, according to the for example pilot frequency design shown in Fig. 7 b, broadcast channel is estimated, and the result of channel estimating is used for the equilibrium treatment of broadcast singal based on pilot signal with first density.After this, based on preset and the corresponding demodulation of modulation, coded system, decoding process base station A place, said broadcast singal through equilibrium treatment is handled, to obtain original broadcast data.
As previously mentioned, if base station A uses fixing first length and first density to send broadcast singal, said first length and first density then should correspondingly prestore at portable terminal D place.
According to a variant of the present invention; Wherein, Base station A is the additional Cyclic Prefix with first length of OFDM/A symbol that is used for broadcast singal; And it is additional second length that Cyclic Prefix had of OFDM/A symbol that is used for unicast signal that said first length is different from, and still, base station A is used for the OFDM/A symbol use of broadcast singal and the identical pilot signal density of OFDM/A symbol that is used for unicast signal.
According to another variant of the present invention; Wherein, Base station A is that the OFDM/A symbol that is used for broadcast singal uses the pilot signal with first density; And said first density is different from second density that is had for the employed pilot signal of OFDM/A symbol that is used for unicast signal, and still, base station A is that the Cyclic Prefix that the OFDM/A symbol added that is used for broadcast singal has identical length with the Cyclic Prefix that is added for the OFDM/A symbol that is used for unicast signal.According to actual conditions, system can or change between above-mentioned each routine said scheme under the control in artificial control automatically.
Fig. 8 is the broadcaster block diagram that in the transmitter of the network equipment of cordless communication network, is used to send broadcast singal according to an embodiment of the present invention.Shown in broadcaster 10 typically be disposed among each base station shown in Figure 2, below be that example describes just with wherein base station A.Shown in broadcaster 10 comprise first judgment means 100, broadcast transmitting device 101, said broadcast transmitting device 101 comprises that specifically broadcast pilot dispensing device 1010, broadcast pilot density confirms that device 1011, broadcasting prefix dispensing device 1012 and broadcasting prefix length confirm device 1013.
Following with reference to Fig. 8 and combine Fig. 2, Fig. 4 to come said broadcaster 10 is described.At first; Receive delay relevant information by unshowned receiving system among a Fig. 8 by portable terminal D report; The delay relevant information that receives will be provided for broadcast pilot density confirm device 1011 and broadcasting prefix length confirm device 1013; Said broadcast pilot density confirms that device 1011 and said broadcasting prefix length confirm that device 1013 confirms to send to portable terminal D the length of the used Cyclic Prefix of broadcast singal according to the said delay relevant information of portable terminal D report, and to the density of the used pilot signal of portable terminal D transmission broadcast singal.Typically, broadcast pilot density confirms that device 1011 and broadcasting prefix length confirm that device 1013 confirms said circulating prefix-length and pilot density by a mapping table that comprises circulating prefix-length, pilot density and postpone relevant information that prestores shown in table 3 in the preceding text.According to a specific embodiment of the present invention; The process of said definite pilot density realizes through the mode of confirming a pilot frequency design; Wherein, said pilot frequency design comprises the pilot frequency design of the pilot tone that is used for broadcast singal and the pilot frequency design that is used for the pilot tone of unicast signal.
First length of determining is provided for broadcasting prefix dispensing device 1012, and said first density of determining then is provided for broadcast pilot dispensing device 1010.
First judgment means 100 judges according to the CID of signal (burst) whether it is broadcast singal; If signal to be sent is a broadcast singal, then come to send the Cyclic Prefix that has the pilot signal of first density and have first length for said broadcast singal by broadcast pilot dispensing device 1010 and broadcasting prefix dispensing device 1012.If signal to be sent is a unicast signal, then can follow scheme of the prior art, for its transmission has the pilot signal of first density and the Cyclic Prefix with first length.
Fig. 9 is for being used for broadcast processing apparatus that the broadcast singal from broadcast source that receives is handled according to an embodiment of the present invention in the receiver of the network equipment of cordless communication network.Shown in broadcast processing apparatus 20 typically be disposed among the portable terminal D shown in Figure 2, below be that example describes just with communicating by letter between portable terminal D and the base station A.Shown in broadcast processing apparatus 20 comprise first processing unit 200, postpone estimation unit 201, delay report device 202 and second judgment means 203; Particularly, said first processing unit 200 comprises: broadcast channel estimation unit 2000, Auxiliary Processing Unit 2001 and broadcasting prefix removal device 2002.
Following with reference to Fig. 9 and combine Fig. 2, Fig. 5 to come said broadcast processing apparatus 20 is described.At first, estimate the time delay that broadcast singal produced, postpone relevant information thereby generate from base station A by said delay estimation unit 201.The said delay relevant information that generates is provided for said delay report device 202.
After this, the said delay relevant information that will be generated by delay report device 202 reports to base station A, so that base station A confirms to be used for the pilot density (first density) and the CP length (first length) of broadcast singal in view of the above.
After the downlink frame from base station A arrives; Corresponding with the framing operation at base station A place; Behind a physical transfer frame that receives from base station A; By the unshowned frame device (function class is similar to the frame module of separating shown in Fig. 5) of separating among a Fig. 9 it is separated the frame operation, this requires portable terminal D to know the frame structure that use in A place, base station.Said frame structure can be notified before this by base station A and give portable terminal D, perhaps is stored in portable terminal D place by appointment in advance.Alternatively; Can prestore at the portable terminal D place indication information of the said frame structure of said indication of system; In the term of validity of this frame structure, base station A uses this frame structure to carry out framing operation always, thus guarantee that portable terminal D can be correct it is separated the frame operation.After this frame structure lost efficacy, system upgraded the frame structure that portable terminal D place prestores again.
Through the said frame of separating, the transmission frame that receives is decomposed into unicast signal and broadcast singal.But, be used for also adding CP before the OFDM/A symbol of clean culture, and also adding CP before the OFDM/A symbol that is used to broadcast with first length with second length.Because first length is different with second length; Therefore; Which signal receiver need know is unicast signal, and which signal is a broadcast singal, thereby according to first length of knowing before this and preset or come to remove CP exactly for separating the signal that frame obtains with second length of base station A agreement.
So each that is obtained by second judgment means, 203 judge frames is additional to have whether the OFDM/A symbol of a CP is broadcast singal.The scheduler of MAC layer that particularly, still can be through base station A is that the special CID that broadcast singal is given carries out said judgement.
If the judged result that second judgment means 203 obtains negates; Be that said OFDM/A symbol is used for unicast signal; Then its judged result is informed a not shown clean culture prefix removal device; Come corresponding second length of basis and unicast signal to come to remove CP by said clean culture prefix removal device for it; Thereby obtained removing the OFDM/A symbol that is used for clean culture of CP, and then through the FFT conversion, by unicast tunnel estimation unit (not shown among Fig. 9) according to pilot frequency design; Carry out the channel estimating of unicast tunnel based on pilot signal with second density; The result of channel estimating is an equilibrium treatment that is used for the device place that unicast signal is carried out auxiliary processing is used for unicast signal, and after this, this device carries out operations such as demodulation, decoding until obtaining original unicast data according to demodulation, the decoding process of preset unicast signal again to this signal; Wherein, Said demodulation, decoding process are corresponding with modulation, the coded system at base station A place, and the said device that is used for unicast signal is carried out auxiliary processing can be served as by Auxiliary Processing Unit shown in Figure 9 2001, also can be a unshowned device that unicast signal is carried out auxiliary processing that is exclusively used in Fig. 9.
If the judged result that obtains in second judgment means 203 is sure; Be that said OFDM/A symbol is used for broadcast singal; Then its judged result is informed said broadcasting prefix removal device 2002, remove its CP based on first length of knowing for this OFDM/A symbol by said broadcasting prefix removal device 2002 again.Thereby obtained removing the OFDM/A symbol that is used to broadcast of CP.After this; After the FFT conversion; Broadcast channel estimation unit 2000 is estimated broadcast channel based on the pilot signal with first density, and the result of channel estimating is transferred to the equilibrium treatment that Auxiliary Processing Unit 2001 is used for broadcast singal according to the for example pilot frequency design shown in Fig. 7 b.After this, Auxiliary Processing Unit 2001 is handled said broadcast singal through equilibrium treatment, to obtain original broadcast data based on preset and the corresponding demodulation of modulation, coded system, decoding process base station A place.
According to a specific embodiment of the present invention, some public system parameters definition of 2ms broadcast area are as shown in table 4:
The public system parameter of table 4:2ms broadcast area
| Parameter | Value |
| Sample frequency f
S＝1/ |
10 megahertzes |
| Significant character part duration T U | 1024xT (102.4 microsecond) |
| The total N of effective subcarrier ST | ?896 |
| The duration of one |
2 milliseconds |
According to this specific embodiment, table 5 and table 6 are depicted as two kinds of special parameters that are respectively the broadcast area definition:
The special parameter of table 5:2ms broadcast area
| Parameter | Value |
| The length C P that is used for the Cyclic Prefix of broadcast singal b | 56xT (5.6 microsecond) |
| Mark space T S | 1080xT (1.08 microsecond) |
| The total N of effective subcarrier used | 897 |
| Targeting signal T p | 290xT (29.0 microsecond) |
| The sum of the OFDM symbol of broadcast area | 9 |
| The duration of one |
2 milliseconds |
The special parameter of table 5:2ms broadcast area
| Parameter | Value |
| Cyclic Prefix duration CP b | 190xT (19 microsecond) |
| Mark space T S | 1214xT (121.4 microsecond) |
| Targeting signal T p | 288xT (28.8 microsecond) |
| The sum of every frame OFDM symbol | 8 |
| The duration of one |
2 milliseconds |
Figure 10 is the performance comparison sketch map of the wireless signal signal to noise ratio/Block Error Rate under the present invention and the prior art.Particularly, carry out emulation relatively through the COST207 channel to prior art and according to Resource Allocation Formula of the present invention, table 6 shows node line of time delay (TDL) parameter of COST207 channel:
| Path number | Time delay [nanosecond] | Average power [dB] | Doppler frequency spectrum | |
| Little | Greatly | |||
| 123456 | ?0?200?400?600?800?1000 | ?0?6000?12000?18000?24000?30000 | 0-6-12-18-24-30 | Jakes (U type spectrum) JakesJakesJakesJakesJakes |
Wherein,, improved the code check of the chnnel coding among the present invention in the simulation process,, increased pilot signal so that two kinds of frame structures have same data transfer rate to compensate it owing to reducing the data transfer rate reduction that the OFDM/A symbolic number causes in order to compare relatively liberally.Correspondingly, Figure 10 shows simulation result.As desired, if broadcast area diffuses through the wireless channel transmission with less time delay, structure then of the present invention can obtain the performance similar with the frame structure of prior art; If broadcast area diffuses through wireless channel transmission (this is a kind of situation of broadcast area) with bigger time delay; Then the frame structure of prior art will cause significant decreased performance by ISI owing to lacking sufficient circulating prefix-length, because rare pilot signal density, make the precision of channel estimation variation; This makes can not transmit broadcast data more reliably; In this situation, frame structure of the present invention obtains tangible performance and improves owing to reduce ISI and increase precision of channel estimation.
More than specific embodiment of the present invention is described.It will be appreciated that the present invention is not limited to above-mentioned specific implementations, those skilled in the art can make various distortion or modification within the scope of the appended claims.
Claims (13)
1. a method that in the transmitter of the network equipment of cordless communication network, is used to send broadcast singal is characterized in that, may further comprise the steps:
A. signal letter sorting to be sent is broadcast singal and unicast signal;
B. send with the corresponding signal of broadcast singal with first send mode and receive supplementary, wherein, said first send mode is different from transmission and receives the second used send mode of supplementary with the corresponding signal of unicast signal, and wherein, this step comprises:
-b1. confirms one first density; Comprise according to the delay relevant information of being reported by one or more broadcast reception ends of said broadcast singal and confirm said first density; Wherein, said delay relevant information is corresponding with the time delay that present networks equipment is produced when the respective broadcast receiving terminal sends broadcast singal;
-determined first density is sent to receiving terminal;
-b2. sends and the corresponding pilot signal of said broadcast singal with determined said first density, and wherein, said first density is different from and is used to send second density used with the corresponding pilot signal of unicast signal.
2. method according to claim 1 is characterized in that, said cordless communication network adopts multi-carrier modulation, and said signal receives supplementary and comprises Cyclic Prefix, and said step b comprises:
Ii. send and the corresponding Cyclic Prefix with first length of broadcast singal, wherein, said first length is different from second length that is had with the corresponding Cyclic Prefix of unicast signal.
3. method according to claim 2 is characterized in that, among the said step b, before said step I i, also comprises:
I. confirm said first length;
Said step I i also comprises:
-send and the corresponding Cyclic Prefix of broadcast singal with determined said first length, wherein, said first length is different from second length that is had with the corresponding Cyclic Prefix of unicast signal.
4. method according to claim 3 is characterized in that, said step I also comprises:
-according to the delay relevant information of being reported by one or more broadcast reception ends of said broadcast singal; Confirm said first length; Wherein, said delay relevant information is corresponding with the time delay that present networks equipment is produced when the respective broadcast receiving terminal sends broadcast singal.
5. one kind is used for method that the broadcast singal from broadcast source that receives is handled in the receiver of the network equipment of cordless communication network, it is characterized in that, may further comprise the steps:
-reception is from first density of broadcast source;
-transmission frame that receives is decomposed into unicast signal and broadcast singal;
A. with first processing mode broadcast singal that receives is handled; Wherein, Said first processing mode is different from handles the second used processing mode to the unicast signal that receives; And said first processing mode is sent with the corresponding signal of said broadcast singal corresponding to said broadcast source place and is received the first used send mode of supplementary, and wherein said signal receives supplementary and comprises pilot signal, and this step comprises
-according to have first density come the broadcast channel of said broadcast source and present networks equipment room is estimated with the corresponding pilot signal of said broadcast singal, with acquisition broadcast channel estimated result;
-utilize said broadcast channel estimated result to come the said broadcast singal that receives is handled;
Wherein, said first density is different from second density that is had with the corresponding pilot signal of unicast signal that is used for the unicast tunnel of said broadcast source and present networks equipment room is estimated;
This method also comprises the steps:
I. estimate the time delay that broadcast singal produced of said broadcast source, generate the delay relevant information;
The said delay relevant information that II. will generate reports to said broadcast source;
This first density is to be confirmed to get according to said delay relevant information by said broadcast source.
6. method according to claim 5 is characterized in that, said cordless communication network is based on multi-carrier modulation, and said signal receives supplementary and also comprises Cyclic Prefix, and said steps A also comprises:
-remove Cyclic Prefix for said broadcast singal with first length, remove the broadcast singal of Cyclic Prefix with generation;
Wherein, said first length is different from second length that Cyclic Prefix had from the unicast signal of this broadcast source.
7. a broadcaster that in the transmitter of the network equipment of cordless communication network, is used to send broadcast singal is characterized in that, comprising:
First judgment means is used to judge whether signal to be sent is broadcast singal;
Broadcast transmitting device; Be used for sending and the corresponding signal reception of broadcast singal supplementary with first send mode; Wherein, Said first send mode is different from and is used to send and the second used send mode of the corresponding signal reception supplementary of unicast signal, and this broadcast transmitting device comprises:
Broadcast pilot density is confirmed device; Be used for the delay relevant information that basis is reported by one or more broadcast reception ends of said broadcast singal; Confirm one first density; Wherein, said delay relevant information is corresponding with the time delay that a plurality of network equipments that comprise present networks equipment are produced when the respective broadcast receiving terminal sends broadcast singal;
The broadcast pilot dispensing device sends and the corresponding pilot signal of broadcast singal with said first density of confirming, wherein, said first density is different from and is used to send second density used with the corresponding pilot signal of unicast signal;
This broadcaster sends to receiving terminal with said first density.
8. broadcaster according to claim 7 is characterized in that, said cordless communication network adopts multi-carrier modulation, and said signal receives supplementary and comprises Cyclic Prefix, and said broadcast transmitting device comprises:
Broadcasting prefix dispensing device is used to send and the corresponding Cyclic Prefix with first length of broadcast singal, and wherein, said first length is different from second length that is had with the corresponding Cyclic Prefix of unicast signal.
9. broadcaster according to claim 8 is characterized in that, said broadcast transmitting device also comprises:
The broadcasting prefix length is confirmed device, is used for confirming said first length;
Said broadcasting prefix dispensing device also is used for, and sends and the corresponding Cyclic Prefix with determined said first length of broadcast singal, and wherein, said first length is different from second length that is had with the corresponding Cyclic Prefix of unicast signal.
10. according to Claim 8 or 9 described broadcasters, it is characterized in that said broadcasting prefix dispensing device also is used for:
-according to the delay relevant information of being reported by one or more broadcast reception ends of said broadcast singal; Confirm said first length; Wherein, said delay relevant information is corresponding with the time delay that a plurality of network equipments that comprise present networks equipment are produced when the respective broadcast receiving terminal sends broadcast singal.
11. one kind is used for broadcast processing apparatus that the broadcast singal from broadcast source that receives is handled in the receiver of the network equipment of cordless communication network, it is characterized in that, said broadcast processing apparatus receives first density from broadcast source, and comprises:
Separate the frame device, be used for the transmission frame that receives is decomposed into unicast signal and broadcast singal;
Second judgment means is used to judge whether the signal that receives is broadcast singal;
First processing unit is used for first processing mode broadcast singal that receives being handled, and wherein, said first processing mode is different from second processing mode that the unicast signal that receives is handled, and said first processing unit comprises:
The broadcast channel estimation unit is used for when received signal is broadcast singal, comes the broadcast channel of said broadcast source and present networks equipment room is estimated according to the broadcast pilot with first density, to obtain the broadcast channel estimated result;
Auxiliary Processing Unit is used to utilize said broadcast channel estimated result to come the said broadcast singal that receives is handled;
Wherein, said first density is different from and is used for second density that unicast pilot signal had that the unicast tunnel of said broadcast source and present networks equipment room is estimated;
This broadcast processing apparatus also comprises:
Postpone estimation unit, be used to estimate the time delay that broadcast singal produced from a plurality of other network equipments, generate the delay relevant information, wherein, said a plurality of other network equipments comprise said broadcast source;
The delay report device is used for the said delay relevant information that generates is reported to said each other network equipment;
This first density is to be confirmed to get according to said delay relevant information by said broadcast source.
12. broadcast processing apparatus according to claim 11 is characterized in that, said cordless communication network is based on multi-carrier modulation, and said first processing unit also comprises:
Broadcasting prefix removal device is used for when received said signal is broadcast singal, for said broadcast singal is removed the Cyclic Prefix with first length, to generate the broadcast singal of removing Cyclic Prefix;
Wherein, said first length is different from second length that Cyclic Prefix had from the unicast signal of this broadcast source.
13. network equipment in cordless communication network; It is characterized in that, comprise according to each saidly is used for sending the broadcaster of broadcast singal and/or according to each described broadcast processing apparatus that the broadcast singal from broadcast source that receives is handled of claim 11 to 12 in the claim 7 to 10.
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| CN101001233A (en) * | 2006-01-12 | 2007-07-18 | 北京三星通信技术研究有限公司 | Method and equipment for transmitting downlink synchronous channel |
| CN101027882A (en) * | 2004-09-24 | 2007-08-29 | 高通股份有限公司 | Method and apparatus for communication in a system employing differing transmission protocols |
| CN101043496A (en) * | 2006-03-20 | 2007-09-26 | 华为技术有限公司 | Method and apparatus for multiplexing different service pilot resources of multi-carrier communication system |
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| CN101027882A (en) * | 2004-09-24 | 2007-08-29 | 高通股份有限公司 | Method and apparatus for communication in a system employing differing transmission protocols |
| CN101001233A (en) * | 2006-01-12 | 2007-07-18 | 北京三星通信技术研究有限公司 | Method and equipment for transmitting downlink synchronous channel |
| CN101043496A (en) * | 2006-03-20 | 2007-09-26 | 华为技术有限公司 | Method and apparatus for multiplexing different service pilot resources of multi-carrier communication system |
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