CN1806406A - Apparatus and method for transmitting and receiving a pilot pattern for identification of a base station in an OFDM communication system - Google Patents

Abstract

In a radio communication system that transmits reference signals for identifying a plurality of base stations from the base station to mobile stations, base station identification patterns for identifying base stations are generated by providing a method for dividing a frequency domain in a frequency-time domain given with the frequency domain and a time domain into a plurality of sub-bands. Reference signal patterns are determined in a predetermined time domain within the time domain at each of the sub-bands. In this way, the number of base stations that can be identified is increased.

Description

In orthogonal FDM communication system, send and receive the equipment and the method for the pilot frequency mode that is used for identification of base stations

Technical field

The present invention relates generally to a kind of communication system of utilizing OFDM (OFDM) scheme, relate in particular to a kind of equipment and method that is used to produce the pilot frequency mode (pilot pattern) of identification base station and sends and receive this pilot frequency mode.

Background technology

Popularize at present be used for via the wire/wireless channel on carry out OFDM (OFDM) scheme of high speed data transfer, use a plurality of carrier waves to transmit data.The OFDM scheme is a kind of to the walk abreast conversion and with multi-carrier modulation (MCM) scheme of the parallel code element of changing of a plurality of subcarriers or a plurality of sub-channel modulation of serial input symbol stream.

To be briefly described operation now.

In the communication system of utilizing the OFDM scheme transmitter of (hereinafter being called " ofdm communication system "), come modulating input data with subcarrier by scrambler, encoder and interleaver.Transmitter provides variable-data-rate, and according to this data rate have different encoding rates, the size that interweaves and modulation scheme.Usually, encoder uses 1/2 or 3/4 encoding rate, and is identified for preventing the interleaver size of burst error (burst error) according to the quantity (NCBPS) of the bits of coded of each OFDM code element.

For modulation scheme, use one of Quadrature Phase Shift Keying (QPSK), 8 system phase shift keyings (8PSK), 16 ary quadrature amplitude (16QAM) and 64 system QAM schemes according to data rate.The pilot subcarrier signal of predetermined quantity is added to by the signal of said elements with the sub-carrier modulation of predetermined quantity, and generate the OFDM code element by contrary fast fourier transform (IFFT) piece subsequently.Frequency domain symbols becomes the time domain code element after IFFT handles.In the IFFT piece, will be used for eliminating the multipath channel environment inter symbol interference protection at interval (guard internal) be inserted in the OFDM code element, and the OFDM code element that will insert the protection interval at last is input to radio frequency (RF) processor.The RF processor is converted to the RF signal with input signal, and via this RF signal of spatial emission.

In the receiver of ofdm communication system, carry out the opposite processing of in transmitter, carrying out, and it is added Synchronous Processing.In receiver, must use the previous training code element of setting of the OFDM code element that receives is estimated frequency shift (FS) and symbol offset.Afterwards, by the fast Fourier transform (FFT) piece, come demodulation to remove protection data symbols at interval with a plurality of subcarriers that added a plurality of pilot subcarrier signals.And for the free routing of handling in the actual wireless channel postpones, equalizer is estimated channel condition for the channel signal that receives, and the distorted signals on the actual wireless channel is cancelled from the channel signal that receives.To be converted to bit stream by the data of equalizer channel estimating, and be entered into deinterleaver.Afterwards, by decoder be used for bit stream that the descrambler output of error correction deinterleaves as final data.

As mentioned above, in ofdm communication system, transmitter or base station (BS) is sent to receiver or mobile radio station (MS) with the pilot subcarrier signal.The base station sends data subcarriers (perhaps " data channel ") signal with the pilot subcarrier signal.Here, the pilot subcarrier signal be sent out in order to obtain synchronously, channel estimating and identification of base stations.The pilot subcarrier signal serves as a kind of training sequence, and is used to carry out the channel estimating between transmitter and the receiver.And mobile radio station uses the pilot subcarrier signal to discern their base station.Between transmitter and receiver, the point that sends the pilot subcarrier signal has been reached agreement in advance.As a result, the pilot subcarrier signal serves as a kind of reference signal.

Compare with data channel signal, the base station sends the pilot subcarrier signal, makes the pilot subcarrier signal to have AD HOC or pilot frequency mode simultaneously with the through cell boarder of high relatively transmitted power.Here, the base station sends the pilot subcarrier signal, make to have the special pilot pattern simultaneously by their cell boarders that can go directly because, when mobile radio station enters the sub-district not about its information of present base station.In order to detect its base station, mobile radio station must use the pilot subcarrier signal.Therefore, the base station pilot subcarrier signal of high relatively transmitted power transmission special pilot pattern, thus mobile radio station can detect its base station.

Pilot frequency mode is to produce by the pilot subcarrier signal that is sent by the base station.Just, pilot frequency mode is based on the transmission starting point of the slope and the pilot subcarrier signal of pilot subcarrier signal.Therefore, ofdm communication system can be designed such that the base station has the next identification in order to them of their own unique pilot frequency modes.In addition, consider coherence bandwidth (coherence bandwidth) and produce pilot frequency mode coherence time (coherencetime).

Coherence bandwidth is illustrated in the frequency domain can suppose the maximum bandwidth that channel is constant.Represent correlation time can suppose the maximum time that channel is constant in the time domain.Because correlation bandwidth and in correlation time the hypothesis channel constant, therefore even for coherence bandwidth with only send a pilot subcarrier signal coherence time, also be enough to obtain synchronously, channel estimating and identification of base stations.As a result, can make the transmission maximization of data channel signal, thereby help to improve the whole system performance.In a word, the peak frequency that is used to send the pilot subcarrier signal is coherence bandwidth at interval, and the maximum time that is used to send the pilot subcarrier signal at interval or maximum OFDM symbol time be coherence time at interval.

The base station number that comprises in ofdm communication system is variable.Therefore, in order to discern all base stations, the quantity with pilot frequency mode of Different Slope and different starting points should equal the quantity of base station.Yet, in ofdm communication system,, should consider correlation bandwidth and coherence time in order in time-frequency domain, to send the pilot subcarrier signal.When considering coherence bandwidth and coherence time, restrictively produce pilot frequency mode with Different Slope and different starting points.When not considering that coherence bandwidth and coherence time generate pilot frequency mode, the pilot subcarrier signal coexistence in the pilot frequency mode of expression different base station.In this case, can not use pilot frequency mode identification base station.

Fig. 1 is that schematic illustration is used the figure of a pilot channel transmission based on the point of the pilot subcarrier signal of pilot frequency mode in traditional ofdm communication system.Yet, before the description that provides Fig. 1, suppose among Fig. 1 graphic circle represent the point of actual transmission pilot subcarrier signal, and express the transmission point of pilot subcarrier signal in the mode of (time domain, frequency domain).

With reference to figure 1, (1,1) 101 places send the first pilot subcarrier signal, (2,4) 102 places send the second pilot subcarrier signal, and 103 places send the 3rd pilot subcarrier signal at (3,7) point, (4,10) 104 places send the 4th pilot subcarrier signal, and 105 places send the 5th pilot subcarrier signal at (5,2) point, (6,5) 106 places send the 6th pilot subcarrier signal, and 107 places send the 7th pilot subcarrier signal at (7,8) point, with (8,11) point 108 places send the 8th pilot subcarrier signal.Suppose that in Fig. 18 OFDM code elements are formed an OFDM frame, and 8 pilot subcarrier signals are formed a pilot channel.

In the graphic pilot channel of Fig. 1, starting point is (1,1) 101, and slope is 3.Just, begin to send the pilot subcarrier signal at (1,1) point 101 places.Afterwards, send other pilot subcarrier signals with slope 3.In addition, represent pilot channel by formula (1) based on the pilot frequency mode that in time-frequency domain, sends.

σ _s(j, t)=st+n _j(modN), for j=1 ..., N _p(1)

In formula (1), σ _s(j t) is illustrated in the transmission point that time t has the j pilot channel of slope " s ", n _jBe frequency shift (FS) and the expression point from the first pilot subcarrier signal of the starting point separation of time-frequency domain, N represents the sum of the subcarrier of ofdm communication system, and N _pThe quantity of expression pilot channel.Here, the quantity N of pilot channel _pBefore in ofdm communication system just determined, and all be known transmitter and receiver.

As a result, for the graphic pilot frequency mode of Fig. 1, slope " s " is 3 (s=3), frequency shift (FS) n _jBe 0 (n _j=0), the total N of the subcarrier of ofdm communication system is 11 (N=11), and the quantity N of pilot channel _pBe 1 (N _p=1).

Fig. 2 is that schematic illustration is used the figure of two pilot channels transmissions based on the point of the pilot subcarrier signal of pilot frequency mode in traditional ofdm communication system.Yet, before the description that provides Fig. 2, suppose among Fig. 2 graphic circle represent the point of actual transmission pilot subcarrier signal, and express the transmission point of pilot subcarrier signal in the mode of (time domain, frequency domain).And, suppose that in Fig. 2 coherence bandwidth 201 is corresponding to 6 subcarriers, and coherence time 202 be 1 in time domain, that is, are OFDM code elements coherence time 202.As above supposed, because coherence bandwidth 201 is OFDM code elements corresponding to 6 subcarriers and coherence time 202, so in order to reflect its channel condition, the pilot subcarrier signal must separate and sends at least one OFDM code element by the bandwidth corresponding with being 6 subcarriers to the maximum.

Perhaps, in coherence bandwidth 201, can send a plurality of pilot subcarrier signals.Yet, in this case,, thereby cause reducing of data rate owing to the transmission of pilot subcarrier signal has sent less data channel signal.Therefore, in Fig. 2, in coherence bandwidth 201, only send a pilot frequency channel signal.

With reference to figure 2, illustrate two pilot channels, that is, and first pilot channel and second pilot channel.For first pilot channel, (1,1) 211 places send the first pilot subcarrier signal, (2,4) 212 places send the second pilot subcarrier signal, and 213 places send the 3rd pilot subcarrier signal at (3,7) point, (4,10) 214 places send the 4th pilot subcarrier signal, and 215 places send the 5th pilot subcarrier signal at (5,2) point, (6,5) 216 places send the 6th pilot subcarrier signal, and 217 places send the 7th pilot subcarrier signal at (7,8) point, with (8,11) point 218 places send the 8th pilot subcarrier signal.For second pilot channel, (1,7) 221 places send the first pilot subcarrier signal, (2,10) 222 places send the second pilot subcarrier signal, and 223 places send the 3rd pilot subcarrier signal at (3,2) point, (4,5) 224 places send the 4th pilot subcarrier signal, and 225 places send the 5th pilot subcarrier signal at (5,8) point, (6,11) 226 places send the 6th pilot subcarrier signal, and 227 places send the 7th pilot subcarrier signal at (7,3) point, with (8,6) point 228 places send the 8th pilot subcarrier signal.

As a result, for first pilot channel, slope " s ₁" be 3 (s ₁=3), frequency shift (FS) n _jBe 0 (n _j=0), the total N of the subcarrier of ofdm communication system is 11 (N=11).In addition, for second pilot channel, slope " s ₂" be 3 (s ₂=3), frequency shift (FS) n _jBe 6 (n _j=6), the total N of the subcarrier of ofdm communication system is 11 (N=11).For pilot frequency mode, first pilot channel has identical pilot frequency mode with second pilot channel, because the frequency shift (FS) n of second pilot channel _jBy correlation bandwidth 201 be defined as next pilot channel of first pilot channel coherence time 202, and the quantity N of pilot channel _pBe 2 (N _p=2).

Fig. 3 is the figure of all possible slope of the pilot frequency mode in the schematic illustration tradition ofdm communication system.With reference to figure 3, according to coherence bandwidth 201 with limit the possible slope and the slope quantity of pilot frequency mode coherence time 202, that is, be used to send the possible slope and the slope quantity of pilot frequency channel signal.Suppose coherence bandwidth 201 be 6 and coherence time 202 be 1, as describing,, then exist 6 possible slope s=0 (301) to s=5 (306) for pilot frequency mode if the slope of pilot frequency mode is an integer in conjunction with Fig. 2.Just, in this case, the possible slope of pilot frequency mode becomes one of integer 0 to 5.When the possible slope quantity of pilot frequency mode is 6, this means that the quantity of the base station that the use pilot frequency mode can be identified in ofdm communication system of satisfying above-mentioned condition is 6.In addition, the pilot subcarrier signal that separates by coherence bandwidth 201 of shaded circles shown in Figure 3 308 expressions.

Determine all possible slope of pilot frequency mode by formula (2).

$s_{\mathrm{val}}=\[0,...,\frac{B_c-1}{T_c}---\left(2\right)$

In equation (2), s _ValThe possible slope of pilot frequency mode in the expression ofdm communication system.Although the slope of pilot frequency mode is integer preferably, the slope of pilot frequency mode needs not to be integer.And, in formula (2), T _cThe quantity of forming the primitive of coherence time in the expression time domain.In Fig. 3, the primitive of forming coherence time is the OFDM code element, therefore, and T _cThe quantity of expression OFDM code element.In addition, in formula (2), B _cThe quantity of the basic subcarrier unit of the coherence bandwidth in the frequency domain is formed in expression.

In fact, the maximum number of representing the possible slope of pilot frequency mode by formula (3).

$S_{\mathrm{no}\_\max }=\frac{B_c}{T_c}---\left(3\right)$

In formula (3), S _{No_max}The maximum number of the possible slope of pilot frequency mode in the expression ofdm communication system.

Fig. 4 is that schematic illustration does not have correct estimation not consider coherence bandwidth and the figure of the operation of the pilot frequency mode that produces in traditional ofdm communication system.Yet, before the description that provides Fig. 4, suppose among Fig. 4 graphic circle represent the point of actual transmission pilot subcarrier signal, and express the transmission point of pilot subcarrier signal in the mode of (time domain, frequency domain).And, suppose that in Fig. 4 coherence bandwidth 201 is 6 in frequency domain, that is, correlation bandwidth 201 is corresponding to 6 subcarriers, and coherence time 202 be 1 in time domain, that is, are OFDM code elements coherence time 202.Do not consider coherence bandwidth 201 and produce two pilot channels of a pilot frequency mode shown in Figure 4.

Slope s with reference to figure 4, the first pilot channels ₁Be 7 (s ₁=7), and the slope s of first pilot channel ₁=7 surpass the greatest gradient 5 for first pilot channel.And, the slope s of second pilot channel ₂Be 7 (s ₂=7), and the slope s of second pilot channel ₂=7 surpass the greatest gradient 5 for second pilot channel.When the slope of pilot channel surpassed greatest gradient by this way, the slope of pilot channel may be estimated mistakenly.Its detailed description is shown below.

For first pilot channel, (1,1) 411 places send the first pilot subcarrier signal, (2,8) 412 places send the second pilot subcarrier signal, and 413 places send the 3rd pilot subcarrier signal at (3,4) point, (4,11) 414 places send the 4th pilot subcarrier signal, and 415 places send the 5th pilot subcarrier signal at (5,7) point, (6,3) 416 places send the 6th pilot subcarrier signal, and 417 places send the 7th pilot subcarrier signal at (7,10) point, with (8,6) point 418 places send the 8th pilot subcarrier signal.

For second pilot channel, (1,7) 421 places send the first pilot subcarrier signal, (2,3) 422 places send the second pilot subcarrier signal, and 223 places send the 3rd pilot subcarrier signal at (3,10) point, (4,6) 424 places send the 4th pilot subcarrier signal, and 425 places send the 5th pilot subcarrier signal at (5,2) point, (6,9) 426 places send the 6th pilot subcarrier signal, and 427 places send the 7th pilot subcarrier signal at (7,5) point, with (8,1) point 428 places send the 8th pilot subcarrier signal.

Yet, because the slope of the slope of first pilot channel and second pilot channel all surpasses greatest gradient shown in Figure 45, so receiver or the slope of mobile radio station possible errors ground estimation first pilot channel and the slope of second pilot channel.For example, even the slope of first pilot channel is 7, mobile radio station is estimated the slope of first pilot channel according to first pilot signal in first pilot channel and second pilot signal in second pilot channel, thereby the slope of estimating first pilot frequency mode mistakenly is 2 (s _{1, wrong}=2).Because the slope with first pilot channel under the situation of the greatest gradient 5 of not considering first pilot channel is set at 7, that is, coherence bandwidth 201 is 6, therefore, the pilot signal in another pilot channel, promptly, second pilot channel is wrong for the pilot signal in first pilot channel.Similarly, even the slope of second pilot channel is 7, mobile radio station is estimated the slope of second pilot channel according to first pilot signal in second pilot channel and second pilot signal in first pilot channel, thereby the slope of estimating second pilot frequency mode mistakenly is 1 (s _{2, wrong}=1).Because the slope with second pilot channel under the situation of the greatest gradient 5 of not considering second pilot channel is set at 7, that is, coherence bandwidth 201 is 6, so pilot signal in another pilot channel, that is, first pilot channel is wrong for the pilot signal in second pilot channel.

Therefore, because the slope of pilot channel is integer and the characteristic that is limited to coherence bandwidth, the positive slope of pilot channel and the relation between the negative slope such as formula (4) are defined as follows:

s ⁺=(coherence bandwidth)-s ^-(4)

In formula (4), s ⁺The positive slope of expression pilot channel, s ^-The negative slope of expression pilot channel.Positive slope and negative slope form a pair of when satisfying formula (2).

As mentioned above, in traditional ofdm communication system, because, therefore also limited the quantity of possible pilot frequency mode by limiting coherence bandwidth and coherence time the generation of the pilot frequency mode that is used for discerning the base station.Therefore, disadvantageously, when the base station number in the ofdm communication system increased, the quantity of the base station of patterns available pattern recognition was subjected to the restriction of the quantity of possible pilot frequency mode.

Summary of the invention

Therefore, the purpose of this invention is to provide a kind of equipment and method that sends and receive the pilot frequency mode group of the base station that is used for discerning ofdm communication system.

Another object of the present invention provides the equipment and the method for pilot frequency mode group that a kind of generation is used for discerning the base station of ofdm communication system.

Another purpose of the present invention provides the equipment and the method for quantity of pilot frequency mode that a kind of maximization is used for discerning the base station of ofdm communication system.

According to an aspect of the present invention, the method that provides a kind of generation to be used for independently being identified in the identification of base stations pattern of the base station in the sub-district under the mobile radio station, the reference signal that will be used to discern a plurality of base stations in wireless communication system is sent to mobile radio station from the base station.Described method comprises step: in the frequency-time-domain given with frequency domain and time domain frequency domain is divided into a plurality of subbands; With the reference signal mode of determining at each subband place of a plurality of subbands.

According to a further aspect in the invention, provide a kind of generation to be used for the method for the identification of base stations pattern of the base station that independent identification wireless communication system comprises, in described wireless communication system, whole frequency band is divided into a plurality of sub-bands, send reference signal at the sub-band place, and send data-signal at the sub-band place, get rid of the sub-band that sends reference signal.Described method comprises step: the subband that whole frequency band is divided into predetermined quantity; Consider that pre-domain and predetermined frequency area calculate the possible reference signal mode at each subband place; Select the reference signal mode of predetermined quantity at each subband place, in the middle of the reference signal mode of calculating; With the selected reference signal mode that is combined in each subband place selection, thereby generate the identification of base stations pattern that is used to discern the base station.

According to another aspect of the invention, the method that provides a kind of generation to be used for the identification of base stations pattern of the base station in the sub-district under the independent identification mobile radio station, the reference signal that will be used to discern the base station in wireless communication system is sent to mobile radio station from the base station.Described method comprises step: form a plurality of sub-pieces by frequency domain being divided into a plurality of subbands, and in the frequency-time-domain given with frequency domain and time domain time domain is divided into a plurality of sub-cycles time; With determine reference signal mode at each sub-piece place.

In accordance with a further aspect of the present invention, provide a kind of generation to be used for the method for the identification of base stations pattern of the base station that independent identification wireless communication system comprises, in described wireless communication system, whole frequency band is divided into a plurality of sub-bands, send reference signal at the sub-band place, and send data-signal at the sub-band place, get rid of the sub-band that sends reference signal.Described method comprises step: form a plurality of sub-pieces by the subband that whole frequency band is divided into predetermined quantity, and time domain is divided into sub-cycle time of predetermined quantity; Consider that pre-domain and predetermined frequency area calculate the possible reference signal mode at each sub-piece place; Select the reference signal mode of predetermined quantity at each sub-piece place, in the middle of the reference signal mode of calculating; With the selected reference signal mode of combination, thus the identification of base stations pattern of definite base station.

According to another aspect of the invention, provide and come a kind of method that sends the identification of base stations pattern of the base station that is used for discerning wireless communication system by mobile radio station, in wireless communication system, whole frequency band is divided into a plurality of sub-bands, send reference signal at least one sub-band place, and send data-signal at the sub-band place, get rid of the sub-band that sends reference signal.Described method comprises step: receive parallel data converted signal; Generate and be used to discern the identification of base stations pattern corresponding reference signal of going to the station to meet somebody; Reference signal is inserted parallel data converted signal; Data converted signal reference signal, parallel is inserted in IFFT (contrary fast fourier transform) conversion; The parallel signal of serial conversion IFFT conversion; Predetermined protection blank signal is inserted the signal of serial conversion; Inserted protection signal at interval with transmission.

In accordance with a further aspect of the present invention, a kind of method that is used for receiving by mobile radio station at wireless communication system the identification of base stations pattern be used to discern the base station is provided, in wireless communication system, whole frequency band is divided into a plurality of sub-bands, send reference signal at least one sub-band place, and send data-signal at the sub-band place, get rid of the sub-band that sends reference signal.Described method comprises step: eliminate the protection blank signal at predetermined period from the signal that receives; Protection signal has at interval been eliminated in parallel conversion; The signal of the parallel conversion of FFT (fast fourier transform) conversion; From the signal of FFT conversion, extract reference signal; Base stations detected recognition mode from the reference signal of being extracted; With the base station under the identification mobile radio station.

According to a further aspect in the invention, the equipment that provides a kind of generation to be used for independently being identified in the identification of base stations pattern of the base station in the sub-district under the mobile radio station, the reference signal that will be used to discern a plurality of base stations in wireless communication system is sent to mobile radio station from the base station.Described equipment comprises: subband and reference signal mode quantity calculator are used for frequency domain and the given frequency-time-domain of time domain frequency domain being divided into a plurality of subbands, and calculate the reference signal mode at each place in a plurality of subbands; With identification of base stations pattern determiner, be used for selecting the reference signal of predetermined quantity in the middle of the reference signal that each subband at a plurality of subbands is in calculating, and make up selected reference signal mode, thereby produce the identification of base stations pattern that is used to discern the base station.

According to a further aspect in the invention, a kind of equipment that is used for generating the identification of base stations pattern of the base station that independent identification wireless communication system comprises is provided, in described wireless communication system, whole frequency band is divided into a plurality of sub-bands, send reference signal at the sub-band place, and send data-signal at the sub-band place, get rid of the sub-band that sends reference signal.Described equipment comprises: subband and reference signal mode quantity calculator are used for whole frequency band is divided into the subband of predetermined quantity, and consider that pre-domain and predetermined frequency area calculate the possible reference signal mode at each subband place; With identification of base stations pattern determiner, be used for the reference signal mode of selection predetermined quantity, and make up selected reference signal mode, thereby generate the identification of base stations pattern that is used to discern the base station at each subband place, in the middle of the reference signal mode of calculating.

According to a further aspect in the invention, the equipment that provides a kind of generation to be used to discern the identification of base stations pattern of the base station in the sub-district under the mobile radio station, the reference signal that will be used to discern the base station in wireless communication system is sent to mobile radio station from the base station.Described equipment comprises: sub-piece and reference signal mode quantity calculator, be used for forming a plurality of sub-pieces by frequency domain being divided into a plurality of subbands, and in the frequency-time-domain given, time domain is divided into a plurality of sub-cycles time and calculates reference signal mode at each sub-piece place with frequency domain and time domain; With identification of base stations pattern determiner, select the reference signal mode of predetermined quantity in the middle of the reference signal mode that is used for calculating, and make up selected reference signal mode, thereby generate the identification of base stations pattern that is used to discern the base station at each subband place.

According to a further aspect in the invention, provide a kind of generation to be used for the equipment of the identification of base stations pattern of the base station that independent identification wireless communication system comprises, in described wireless communication system, whole frequency band is divided into a plurality of sub-bands, be sent in the reference signal of sub-band, and be sent in the data-signal of sub-band, get rid of the sub-band that sends reference signal.Described equipment comprises: sub-piece and reference signal mode number generator, be used for forming a plurality of sub-pieces and time domain being divided into sub-cycle time of predetermined quantity, and consider that pre-domain and predetermined frequency area calculate the possible reference signal mode at each sub-piece place by the subband that whole frequency band is divided into predetermined quantity; With identification of base stations pattern determiner, be used for the reference signal mode of selection predetermined quantity, and make up selected reference signal mode, thereby produce the identification of base stations pattern of identification base station at each sub-piece place, in the middle of the reference signal mode of calculating.

According to a further aspect in the invention, a kind of equipment that is used for receiving by mobile radio station the identification of base stations pattern of the base station be used to be identified in wireless communication system is provided, in wireless communication system, whole frequency band is divided into a plurality of sub-bands, send reference signal at least one sub-band place, and send data-signal at the sub-band place, get rid of the sub-band that sends reference signal.Described equipment comprises: receiver, be used for eliminating the protection blank signal from the signal that receives, and protection signal has at interval been eliminated in parallel conversion at predetermined period; The fast Fourier transform (FFT) piece is used for the signal of FFT conversion from receiver output; The reference signal extractor is used for extracting reference signal from the signal of FFT conversion; With synchronous and channel estimator, be used for from the reference signal base stations detected recognition mode of reference signal extractor extraction, and the base station under the identification mobile radio station.

Description of drawings

When in conjunction with the accompanying drawings from following detailed description, of the present invention above and other aspects, feature and advantage will become more obvious, wherein:

Fig. 1 is that schematic illustration is used the figure of a pilot channel transmission based on the point of the pilot subcarrier signal of pilot frequency mode in traditional ofdm communication system;

Fig. 2 is that schematic illustration is used the figure of two pilot channels transmissions based on the point of the pilot subcarrier signal of pilot frequency mode in traditional ofdm communication system;

Fig. 3 is the figure of schematic illustration all possible slope of pilot frequency mode in traditional ofdm communication system;

Fig. 4 is schematic illustration estimates not consider the operation of the pilot frequency mode that produces under the situation of coherence bandwidth mistakenly in traditional ofdm communication system figure;

What Fig. 5 A and 5B were schematic illustration according to first embodiment of the invention sends figure based on the point of the pilot subcarrier signal of pilot frequency mode group in ofdm communication system;

Fig. 6 is graphic extension according to the flow chart of process that is used to distribute the pilot frequency mode group of first embodiment of the invention;

Fig. 7 is graphic extension according to the block diagram of internal structure of equipment that is used to distribute the pilot frequency mode group of first embodiment of the invention;

What Fig. 8 was a schematic illustration according to second embodiment of the invention sends figure based on the position of the point of the pilot subcarrier signal of pilot frequency mode group in ofdm communication system;

Fig. 9 is graphic extension according to the flow chart of process that is used to distribute the pilot frequency mode group of second embodiment of the invention;

Figure 10 is graphic extension according to the block diagram of internal structure of equipment that is used to distribute the pilot frequency mode group of second embodiment of the invention; With

Figure 11 is the block diagram that schematic illustration is used to realize the ofdm communication system of the embodiment of the invention.

Embodiment

Describe several preferred embodiments of the present invention in detail below with reference to accompanying drawing.In the following description, the known function incorporated into and the detailed description of configuration have been omitted for simplicity herein.

The invention provides a kind of method that is used for generating the pilot frequency mode of identification base station (BS) in the communication system of utilizing OFDM (OFDM) system (hereinafter being called " ofdm communication system ").More specifically, the first embodiment of the present invention provides a kind of like this method, that is, the whole frequency band that will use in ofdm communication system is divided into a plurality of subbands, and generate pilot frequency mode, thereby the sum of available pilot frequency mode in the maximization ofdm communication system at each subband.And, the second embodiment of the present invention provides a kind of like this method, the whole frequency band of soon using in ofdm communication system is divided into a plurality of subbands, and generating pilot frequency mode, thereby the method for the sum of available pilot frequency mode in the maximization ofdm communication system by predetermined period of time or identification being divided into each sub-piece that a plurality of sub-cycles time form the required BS recognition mode time cycle of pilot frequency mode.

What Fig. 5 A and 5B were schematic illustration according to first embodiment of the invention sends figure based on the point of the pilot subcarrier signal of pilot frequency mode group (pilot pattern set) in ofdm communication system.Yet, before the description that provides Fig. 5 A and 5B, should be noted that in ofdm communication system that transmitter or base station are sent to receiver or mobile radio station (MS) with the pilot subcarrier signal.The base station sends data subcarriers (hereinafter being called " data channel ") signal with the pilot subcarrier signal.The pilot subcarrier signal be sent out in order to obtain synchronously, channel estimating and identification of base stations.The pilot subcarrier signal serves as a kind of training sequence, and is used to carry out the channel estimating between transmitter and the receiver.And mobile radio station uses the pilot subcarrier signal to discern their base station.In addition, between transmitter and receiver, the point that sends the pilot subcarrier signal has been reached agreement in advance.

And pilot frequency mode is meant the pattern that produces by the pilot subcarrier signal that sends from the base station.Just, pilot frequency mode is based on the slope of pilot subcarrier signal and the transmission starting point of pilot subcarrier signal produces.Therefore, ofdm communication system can be designed such that the base station has the identification of their own unique pilot frequency modes in order to them.In addition, consider coherence bandwidth and produce pilot frequency mode coherence time.Coherence bandwidth is illustrated in the frequency domain can suppose the maximum bandwidth that channel is constant.Represent correlation time can suppose the maximum time that channel is constant in the time domain.Because can suppose correlation bandwidth and in correlation time channel constant, therefore,, also be enough to obtain synchronously, channel estimating and identification of base stations even for coherence bandwidth with only send a pilot subcarrier signal coherence time.As a result, can make the transmission maximization of data channel signal, thereby help to improve the whole system performance.

Therefore, in common ofdm communication system, the peak frequency that is used to send the pilot subcarrier signal is considered to coherence bandwidth at interval, and the maximum time that is used to send the pilot subcarrier signal at interval or maximum OFDM symbol time be considered to coherence time at interval.Pilot frequency mode quantitatively also is restricted, and produces because of their consideration coherence bandwidths and coherence time.

The restriction of pilot frequency mode quantity makes the pilot frequency mode lack the base station that is used to distinguish the ofdm communication system that quantity increasing.Therefore, the first embodiment of the present invention provides a kind of whole frequency band that is used for ofdm communication system to be divided into a plurality of subbands and independently generates the method for pilot frequency mode at each subband place.More specifically, the whole frequency band of ofdm communication system can be divided into a plurality of sub-bands corresponding with subcarrier.A plurality of sub-bands are generated as several groups, and the group of sub-band becomes subband.

Fig. 5 A illustrates the point that sends the pilot subcarrier signal according to the pilot frequency mode of distributing to first base station.With reference to figure 5A, whole frequency band is divided into b the subband of first subband 511 to b subband 517.At first subband 511 each subband place, consider coherence bandwidth 501 and generate pilot frequency mode coherence time 502 to b subband of b subband 517.For convenience of explanation, suppose in Fig. 5 A, for coherence bandwidth 501 with only send a pilot subcarrier signal coherence time 502.Perhaps, for coherence bandwidth 501 with can send a plurality of pilot subcarrier signals coherence time 502.And, although first subband 511 to b subband 517 equates that in size they also can vary in size in Fig. 5 A.

With reference to figure 5A, the pilot frequency mode of first subband 511 has slope s ₁, the pilot frequency mode of second subband 513 has slope s ₂, the pilot frequency mode of the 3rd subband 515 has slope s ₃, the pilot frequency mode of the 4th subband 517 has slope s _bThe result, in order to discern first base station, mobile radio station must have the information about the slope group of all available in first base station pilot frequency modes, that is the pilot frequency mode slope group [s that selects to b subband 517 places in the middle of the slope of the pilot frequency mode that first subband 511 produces separately to b subband 517 places, at first subband 511, ₁, s ₂, s ₃..., s _b].If before the slope group of pilot frequency mode is reached an agreement between transmitter or first base station and receiver or mobile radio station, then mobile radio station can be discerned first base station.Here, the slope group that is used to discern the pilot frequency mode of base station can be known as " pilot frequency mode group ".Just, the pilot frequency mode group is assigned to each base station of forming ofdm communication system, and mobile radio station is discerned the pilot frequency mode group of its base station in the middle of a plurality of pilot frequency mode groups.Just, the pilot frequency mode group becomes a kind of identification of base stations pattern that is used to discern the base station.

Mobile radio station detects distributes to the slope of first subband 511 to the pilot frequency mode of b subband 517, and detects the pilot frequency mode group, that is, and and the slope of one group of pilot frequency mode.And mobile radio station detects the base station corresponding with the pilot frequency mode group, and determines that detected base station is its base station, that is, and and first base station.

Fig. 5 B illustrates the point that sends the pilot subcarrier signal according to the pilot frequency mode of distributing to second base station that is different from first base station.With reference to figure 5B, whole frequency band is divided into b the subband of first subband 511 to b subband 517.At first subband 511 each subband place, consider coherence bandwidth 501 and generate pilot frequency mode coherence time 502 to b subband of b subband 517.For convenience of explanation, suppose in Fig. 5 B, for coherence bandwidth 501 with only send a pilot subcarrier signal coherence time 502.Perhaps, for coherence bandwidth 501 with can send a plurality of pilot subcarrier signals coherence time 502.Here, the subband difference of Fig. 5 A and 5B is to be chosen in the slope of the pilot frequency mode that each subband place produces.By selecting Different Slope to generate the pilot frequency mode group, can discern different base stations for the pilot frequency mode of each subband.

The pilot frequency mode of first subband 511 has slope s ₂, the pilot frequency mode of second subband 513 has slope s ₁, the pilot frequency mode of the 3rd subband 515 has slope s ₃, the pilot frequency mode of b subband 517 has slope s ₂The result, in order to discern second base station, mobile radio station must have the information about the slope group of the pilot frequency mode of distributing to second base station, that is the pilot frequency mode slope group [s that selects to b subband 517 places in the middle of the slope of the pilot frequency mode that first subband 511 produces separately to b subband 517 places, at first subband 511, ₂, s ₁, s ₃..., s ₂].If before the slope group of pilot frequency mode is reached an agreement between transmitter or second base station and receiver or mobile radio station, then mobile radio station can be discerned second base station.

The whole frequency band of ofdm communication system is divided into b subband.At each subband place of b subband, consider coherence bandwidth and generate pilot frequency mode coherence time.For example, suppose that the quantity (that is, can be produced at each subband place) at the available pilot frequency mode in each subband place is M.From the pilot frequency mode of selecting in M available pilot frequency mode of each subband, and the slope group of the pilot frequency mode that will select at each subband place is generated as a pilot frequency mode group.When generating the pilot frequency mode group by this way, determine the quantity of possible pilot frequency mode group by formula (5).

In formula (5), the quantity of available pilot frequency mode group in " quantity of pilot pattern group " expression ofdm communication system, S _MaxThe maximum number of expression pilot frequency mode, that is, in the quantity of the slope of the available pilot frequency mode in each subband place of ofdm communication system, and b represents the quantity of the subband of ofdm communication system.For example, if be 4 (S at the maximum number of the available pilot frequency mode in each subband place _Max=4) and the quantity of the subband of ofdm communication system when being 5 (b=5), the sum of the base station that can be discerned by ofdm communication system is 1024 (4 ⁵=1024).

Fig. 6 is graphic extension according to the flow chart of process that is used to distribute the pilot frequency mode group of first embodiment of the invention.Yet, before the description that provides Fig. 6, should be noted that the controller (not shown) on the upper strata that is used for ofdm communication system is given each base station of forming ofdm communication system with the pilot frequency mode set of dispense, so that carry out process shown in Figure 6.And, controller to each base station notice about information, and to each mobile radio station notice identical information to the pilot frequency mode group of its distribution.Each base station sends the pilot signal that is used for identification of base stations according to the pilot frequency mode group to its distribution then, and mobile radio station uses the pilot frequency mode group of the pilot signal that receives to determine which base station it belongs to.

With reference to figure 6, in step 611, controller is divided into a plurality of subbands with the whole frequency band of ofdm communication system.Here, can determine the quantity of the subband that the whole frequency band of ofdm communication system is divided according to the characteristic of ofdm communication system with changing.In step 613, controller is determined the available pilot frequency mode at each subband place of the subband of being divided.Here, as mentioned above, consider coherence bandwidth and determine available pilot frequency mode coherence time at each subband place.

In step 615, controller determines to be assigned to the pilot frequency mode group of each base station of forming ofdm communication system.Here, the pilot frequency mode group is to produce by being chosen in one of available pilot frequency mode in each subband place, and as mentioned above, the pilot frequency mode group is meant one group of pilot frequency mode selecting for each subband.In step 617, controller is determined the quantity NO of definite at present pilot frequency mode group _BSWhether equal to form the sum M AX_NO of the base station of ofdm communication system _BSIf determine the quantity NO of definite at present pilot frequency mode group _BSThe sum M AX_NO that is not equal to the base station of forming ofdm communication system _BS, then in step 619, controller makes the quantity NO of the pilot frequency mode group of determining at present _BSIncrease by 1 (NO _BS++), and turn back to step 613 subsequently.

Yet, if determine the quantity NO of definite at present pilot frequency mode group in step 617 _BSEqual to form the sum M AX_NO of the base station of ofdm communication system _BS, the ongoing process of control unit end then.

Fig. 7 is graphic extension according to the block diagram of internal structure of equipment that is used to distribute the pilot frequency mode group of first embodiment of the invention.With reference to figure 7, pilot frequency mode set of dispense equipment comprises subband and pilot frequency mode quantity calculator 711, pilot frequency mode group determiner 713 and pilot frequency mode column of dispensers 715.Subband and pilot frequency mode quantity calculator 711 receives the information of sub band number " b ", coherence time and coherence bandwidth that the whole frequency band about ofdm communication system is divided, and each of calculating in b subband about the information of sub band number " b ", coherence time and coherence bandwidth of considering to receive is located the quantity of available pilot frequency mode.For example, suppose that each the available pilot frequency mode number in place in b subband is s _MaxJust, each the subband place in b subband can produce and has s ₁To s _MaxSlope [s ₁..., s _Max] pilot frequency mode.

Subband and pilot frequency mode quantity calculator 711 will be counted S about each the available pilot frequency mode in place in b subband _MaxInformation export pilot frequency mode group determiner 713 to.Pilot frequency mode group determiner 713 receives about each the available pilot frequency mode in place in b subband and counts S _MaxInformation, and determine the pilot frequency mode group by being chosen in one of each available pilot frequency mode in place in b the subband.Here, the quantity of pilot frequency mode group is based on that the quantity of the quantity of the available pilot frequency mode in each subband place and subband determines, as above in conjunction with as described in the formula (5).

Pilot frequency mode group determiner 713 exports determined pilot frequency mode group to pilot frequency mode column of dispensers 715.Pilot frequency mode column of dispensers 715 receives from the pilot frequency mode group of pilot frequency mode group determiner 713 outputs, and gives each base station of forming ofdm communication system with this pilot frequency mode set of dispense.

What Fig. 8 was a schematic illustration according to second embodiment of the invention sends figure based on the position of the point of the pilot subcarrier signal of pilot frequency mode group in ofdm communication system.Yet, before the description that provides Fig. 8, should be noted that following situation.A kind of whole frequency band with ofdm communication system is divided into a plurality of subbands and by selecting an available pilot frequency mode of each subband place to generate the method for pilot frequency mode group, it is a plurality of subbands and the method that generates the pilot frequency mode group by the pilot frequency mode that produces each sub-piece place independently that the second embodiment of the present invention provides a kind of whole time-frequency band division with ofdm communication system though the first embodiment of the present invention has proposed.

The whole frequency band of ofdm communication system is divided into a plurality of sub-bands corresponding with subcarrier.In the second embodiment of the present invention, a plurality of sub-bands are generated as the group of predetermined quantity, and the sub-band that comprises in each group is defined as " subband ".The subband that defines in term used herein " subband " and the first embodiment of the invention is identical.

In addition, the transmitting time cycle of ofdm communication system can be divided into a plurality of time cycles with pre-sizing, and each time cycle will be defined as " sub-cycle time ".

Here,---represent by a subband and a sub-time cycle---to be defined as " sub-piece " with the piece on the time-frequency domain.Therefore, the second embodiment of the present invention maximizes the quantity of the base station that can be identified by producing pilot frequency mode based on sub-piece and distinguishing pilot frequency mode based on sub-piece.

In addition, in Fig. 8, trunnion axis express time axle, and vertical axis is represented frequency axis.Just, the time-frequency domain of ofdm communication system is based on sub-piece and divides.

With reference to figure 8, whole frequency band is divided into b the subband of first subband 811 to b subband 817.For example, in Fig. 8, each subband has been generated 8 subcarriers.Frequency band with 32 subcarriers can be divided into the individual subband of 4 (32/8=4).Although subband and sub-cycle time equate that in size subband in size can be different with sub-cycle time in Fig. 8.For example, the big I of subband is set so that first subband 811 has 5 size and the second sub-piece 813 has 10 size, and perhaps first subband 811 has 4 the size and the second sub-piece 813 and has 7 size.Just, sub-piece can be implemented as and have different sizes.Yet, in the second embodiment of the present invention, suppose that sub-piece has identical size, explain with convenient.

In time-frequency domain, the whole time cycle can be divided into a plurality of sub-cycles time 819,812,823 and 825.For example, in Fig. 8,8 code element transmission cycles are formed a sub-time cycle.Just, 8 code elements are sent to mobile radio station from the base station, a sub-time cycle goes at every turn.Based on above-mentioned sub-piece (800), distribute the pilot frequency mode group, thereby can discern a plurality of base stations by distributing pilot frequency mode.Here, the length of the time domain of sub-piece is defined as sub-block length 802, and is sub-piece bandwidth 801 definitions of bandwidth of the frequency domain of sub-piece.Just, in Fig. 8, sub-block length and sub-piece bandwidth all are 8.

Should consider to establish coherence bandwidth and coherence time the length and the bandwidth of stator block.Just, can't satisfy coherence time and coherence bandwidth, then in distinguishing pilot frequency mode, misoperation occur as mentioned above as the length and the bandwidth of fruit piece.In Fig. 8, the pilot frequency mode group comprises 8 different pilot frequency mode S ₀To S7.

Basically, pilot frequency mode S independently ₀To S ₇Be based on sub-piece (800) and produce.As mentioned above, sub-piece 800 is represented by the sub-block length 802 in the time domain, and can be set to a plurality of master data transmitting elements.In addition, sub-piece 800 can be represented by the sub-piece bandwidth 801 in the frequency domain, and occupies in b the subband one, and the whole frequency band of ofdm communication system is divided into b subband.A plurality of sub-pieces are formed a pilot blocks.Here, pilot blocks comprises a plurality of sub-pieces, and each sub-piece produces independently pilot frequency mode.The one group of pilot frequency mode that produces at the sub-piece place that forms pilot blocks is generated as the pilot frequency mode group.

The length of pilot blocks equals by with the length addition of the sub-piece of predetermined quantity and definite value.The bandwidth of pilot blocks equals the whole bandwidth of ofdm communication system.Just, a pilot blocks comprises a plurality of sub-cycles time and a plurality of subband.For example, suppose in Fig. 8 that a pilot blocks comprises 2 sub-time cycles and b subband.Just, suppose that a pilot blocks is made up by 2 * b pilot sub-block.In Fig. 8, illustrate 2 pilot blocks, each pilot blocks is made up of 2 * b pilot sub-block.

Cycle in pilot block length repeatedly generates the pilot frequency mode group, that is, and and based on the pilot frequency mode of pilot blocks generation.Just, in Fig. 8, because the length of pilot blocks equals 2 sub-time cycles, therefore per 2 sub-time cycles repeat to have the pilot blocks of same pilot modal sets.

The pilot frequency mode group that is used to discern the base station can be expressed as the pilot frequency mode group matrix P by formula (6) definition _t

$P_t=\left[\begin{array}{ccc}{S}_0& {\mathrm{<figure-callout\; id="4"\; label="S"\; filenames="A20048001655700331.png,A20048001655700341.png"\; state="\{\{state\}\}">S</figure-callout>}}_4& \&CenterDot;\&CenterDot;\&CenterDot;\\ S_1& {\mathrm{<figure-callout\; id="2"\; label="S"\; filenames="A20048001655700331.png,A20048001655700341.png"\; state="\{\{state\}\}">S</figure-callout>}}_2& \&CenterDot;\&CenterDot;\&CenterDot;\\ S_3& {\mathrm{<figure-callout\; id="7"\; label="S"\; filenames="A20048001655700331.png,A20048001655700341.png"\; state="\{\{state\}\}">S</figure-callout>}}_7& \&CenterDot;\&CenterDot;\&CenterDot;\\ & \&CenterDot;\&CenterDot;\&CenterDot;& \\ S_5& {\mathrm{<figure-callout\; id="6"\; label="S"\; filenames="A20048001655700331.png,A20048001655700341.png"\; state="\{\{state\}\}">S</figure-callout>}}_6& \&CenterDot;\&CenterDot;\&CenterDot;\end{array}\right]---\left(6\right)$

As shown in Equation (6), be expressed in the pilot frequency mode group that generates in the pilot blocks with matrix form.Just, in first sub-cycle time, send pilot frequency mode S for each subband ₀, S ₁, S ₃..., S ₅, and send pilot frequency mode S for each subband in the time cycle at next son ₄, S ₂, S ₇..., S ₆

In Fig. 8, in first sub-cycle time 819, send pilot frequency mode S for first subband 811 ₀, send pilot frequency mode S for second subband 813 ₁, send pilot frequency mode S for the 3rd subband 815 ₃, and by this way, for b subband 817, that is, last subband sends pilot frequency mode S ₅

Similarly, in second sub-cycle time 821, send pilot frequency mode S for first subband 811 ₄, send pilot frequency mode S for second subband 813 ₂, send pilot frequency mode S for the 3rd subband 815 ₇, and by this way, for b subband 817, that is, last subband sends pilot frequency mode S ₆As mentioned above, based on the transmission starting point of the slope of pilot frequency channel signal and pilot frequency channel signal and generate pilot frequency mode S ₀To S ₇

In Fig. 8 because pilot blocks by two sub-time blocks or 2 * b sub-piece and forms, so repeat identical pilot frequency mode group for per two sub-time cycles.Just, the pilot frequency mode group that comprises the pilot frequency mode in first sub-cycle time 819 and second sub-cycle time 821 equals to comprise the pilot frequency mode group of the pilot frequency mode in the 3rd sub-cycle time 823 and the 4th sub-cycle time 825.When pilot blocks on the pilot frequency mode group not simultaneously, it means that relevant base station differs from one another.Yet, when mobile radio station continues with the same base swap data, come repetition pilot frequency mode group based on pilot blocks.

Just, because produce the pilot frequency mode group that is used to discern the base station based on pilot blocks, so mobile radio station can receive identical or different pilot frequency mode group based on pilot blocks.In Fig. 8, mobile radio station only with base station exchange data, and repeat identical pilot frequency mode group based on pilot blocks.

As mentioned above, pilot blocks produces different pilot frequency modes for each sub-piece of being made up of a plurality of sub-cycles time and a plurality of subbands.Just, consider coherence bandwidth and coherence time, sub-piece can produce with formula (3) in the S that provides _{No_max}As many pilot frequency mode.

Quantity according to the possible pilot frequency mode group of second embodiment of the invention can be represented by formula (7).

In formula (7), S _MaxRepresent the maximum number of the possible slope of ideograph (plot pattern), and equal the S of formula (3) _{No_max}S _MaxExpression can be distinguished the quantity of the pilot frequency mode of a plurality of sub-pieces of forming a pilot blocks.And in formula (7), l represents to form in the time domain quantity in sub-cycle time of a pilot blocks.For example, if the maximum number S of the ideograph that hypothesis can generate in a sub-piece _MaxBe 4 (S _Max=4), and a pilot blocks comprises 3 subbands and comprise two sub-time cycles that on time domain then the quantity according to the possible pilot frequency mode group of formula (7) becomes 4 ^{3 * 2}=4096.

Fig. 9 is graphic extension according to the flow chart of process that is used to distribute the pilot frequency mode group of second embodiment of the invention.Yet, before the description that provides Fig. 9, should be noted that the controller (not shown) on the upper strata of ofdm communication system is given each base station of forming ofdm communication system with the pilot frequency mode set of dispense, so that the process of execution graph 9.And controller will be notified to each base station about the information to the pilot frequency mode group of its distribution, and identical information is notified to each mobile radio station.Each base station sends pilot signal in order to identification of base stations according to the pilot frequency mode group to its distribution then, and mobile radio station uses the pilot frequency mode group of the pilot signal that receives to determine which base station it belongs to.

With reference to figure 9, in step 911, controller is divided into a plurality of subbands with the whole frequency band of ofdm communication system, and the pilot frequency mode group time cycle is divided into a plurality of sub-cycles time, so that form a plurality of sub-pieces.Here, can determine the subband and the quantity in sub-cycle time that the whole frequency band of ofdm communication system and pilot frequency mode group time cycle are divided according to the characteristic of ofdm communication system with changing.

In step 913, controller is determined the available pilot frequency mode at the sub-piece place of each formation.Here, available pilot frequency mode is considered coherence bandwidth and is determined coherence time at each sub-piece place, as mentioned above.In step 915, controller determines to be assigned to the pilot frequency mode group of each base station that comprises in the ofdm communication system.

In step 917, controller is determined the quantity NO of definite at present pilot frequency mode group _BSWhether equal to form the sum M AX_NO of the base station of ofdm communication system _BSIf determine the quantity NO of definite at present pilot frequency mode group _BSThe sum M AX_NO that is not equal to the base station of forming ofdm communication system _BS, then in step 919, controller makes the quantity NO of the pilot frequency mode group of determining at present _BSIncrease by 1 (BO _BS++), and turn back to step S913 subsequently.

Yet, if determine the quantity NO of definite at present pilot frequency mode group in step 917 _BSEqual to form the sum M AX_NO of the base station of ofdm communication system _BS, the ongoing process of control unit end then.

Figure 10 is graphic extension according to the block diagram of internal structure of equipment that is used to distribute the pilot frequency mode group of second embodiment of the invention.With reference to Figure 10, pilot frequency mode set of dispense equipment comprises sub-piece and pilot frequency mode quantity calculator 1011, pilot frequency mode group determiner 1013 and pilot frequency mode column of dispensers 1015.

Sub-piece and pilot frequency mode quantity calculator l011 receive the information about number of sub-bands " b ", minimum data transmission/receiving cycle length, pilot frequency mode group time cycle length l, coherence time and the coherence bandwidth that will be distinguished in ofdm communication system, and the information that consideration receives about sub band number " b ", minimum data transmission/receiving cycle length, pilot frequency mode group time cycle length l, coherence time and coherence bandwidth, and calculating is in the quantity of the available pilot frequency mode in the sub-piece of each b * l place.For example, if hypothesis is S in the quantity that each subband goes out available pilot frequency mode _Max, then can produce and have S at each subband place _lTo S _MaxSlope [S ₁..., S _Max] pilot frequency mode.

Subband and pilot frequency mode quantity calculator 1011 will be about the quantity S at the available pilot frequency mode of the sub-piece of each b * l _MaxInformation export pilot frequency mode group determiner 1013 to.Pilot frequency mode group determiner 1013 receives about the quantity S at the available pilot frequency mode in the sub-piece of each b * l place _MaxInformation, and determine the pilot frequency mode group by being chosen in an available pilot frequency mode of the sub-piece of each b * l place.

Here, the quantity of pilot frequency mode group is based on the quantity of the available pilot frequency mode in each sub-piece place and forms that the quantity of the sub-piece of a pilot blocks determines, as described in conjunction with formula (7).

Pilot frequency mode group determiner 1013 exports determined pilot frequency mode group to pilot frequency mode column of dispensers 1015.Pilot frequency mode column of dispensers 1015 receives from the pilot frequency mode group of pilot frequency mode group determiner 1013 outputs, and gives each base station of forming ofdm communication system with this pilot frequency mode set of dispense.

Figure 11 is the block diagram that schematic illustration is used to realize the ofdm communication system of the embodiment of the invention.With reference to Figure 11, ofdm communication system comprises transmitting apparatus or base station equipment 1l00 and receiving equipment or mobile station apparatus 1150.

Base station equipment 1100 comprises symbol mapper 1111, serial-to-parallel (S/P) transducer 1113, pilot frequency mode generator 1115, contrary fast fourier transform (IFFT) piece 1117, parallel-to-serial (P/S) transducer 1119, protection inserter 1121, digital-to-analogue (D/A) transducer 1123 and radio frequency (RF) processor 1125 at interval.When existing, the information data position is input to symbol mapper 1111 with the information data position that is sent out.The information data position that symbol mapper 1111 uses predetermined modulation schemes to come symbol mapped (perhaps modulation) to receive, and export the information data position of symbol mapped to serial-to-parallel transducer 1113.Here, Quadrature Phase Shift Keying (QPSK) or 16 ary quadrature amplitude (16QAM) can be used as modulation scheme.1113 pairs of serial-to-parallel transducers are from the conversion that walk abreast of the modulated serial code elements of symbol mapper 1111 outputs, and the modulated symbol of changing that will walk abreast exports pilot frequency mode generator 1115 to.Pilot frequency mode generator 1115 receives the modulated symbol of parallel conversion, produce pilot frequency mode according to the pilot frequency mode group of distributing to base station itself in the above described manner, the pilot frequency mode that is produced is inserted the modulated symbol of parallel conversion, and export the code element that obtains to IFFT piece 1117.Here, will be from the signal of pilot frequency mode generator 1115 output, that is, comprise that the code element of modulation and the parallel signal of the pilot frequency code element corresponding with pilot frequency mode are called X ₁(k).The operation that produces pilot frequency mode according to the pilot frequency mode group is equal to the operation of describing in conjunction with the present invention first and second embodiment.Therefore, do not repeat detailed description.

1117 couples of signal X of IFFT piece from 1115 outputs of pilot frequency mode generator ₁(k) carry out N-point IFFT, and export the signal that obtains to parallel-to-serial transducer 1119.The described signal of parallel-to-serial transducer 1119 serial conversion, and export the signal of serial conversion to protection inserter 1121 at interval.Here, the signal from parallel-to-serial transducer 1119 outputs will be known as x ₁(n).Protection inserter 1121 at interval will protect blank signal to insert from the signal of parallel-to-serial transducer 1119 outputs, and export the signal that obtains to digital to analog converter 1123.Here, insert protection at interval so that eliminate the previous OFDM code element and the interference between the current OFDM code element that current OFDM symbol time will send of OFDM symbol time transmission formerly in the ofdm communication system.In addition; at the last specific assignment sampling of the OFDM code element that is used for copying and effectively inserting in Cyclic Prefix (Cyclic Prefix) method of the sampling that is copied in the OFDM code element in time domain; perhaps at first specific assignment sampling of the OFDM code element that is used for copying and effectively inserting in cyclic suffix (CyclicPostfix) method of the sampling that is copied in the OFDM code element, use protection at interval at frequency domain.And, will be called from the signal of protection interval inserter 1121 outputs Signal from inserter 1121 outputs of protection interval

Become an OFDM code element.

1123 pairs of signals from inserter 1121 outputs of protection interval of digital to analog converter carry out analog converting, and export the signal that obtains to RF processor 1125.Here, RF processor 1125 comprises filter and front end unit.1125 pairs of signals from digital to analog converter 1123 outputs of RF processor carry out RF to be handled, thereby it can send via the space, and sends the signal that RF handles via antenna by the space.

Mobile station apparatus 1150 comprises RF processor 1151, modulus (A/D) transducer 1153, protection interval remover 1155, serial-to-parallel (S/P) transducer 1157, fast Fourier transform (FFT) piece 1159, equalizer 1161, pilot extractor 1163, synchronous and channel estimator 1165, parallel-to-serial (P/S) transducer 1167 and symbol de-maps device 1169.Send signal experience multipath channel from base station equipment 1100, and receive the noise component(s) that comprises before to its interpolation via the antenna of mobile station apparatus 1150

The signal that receives via antenna is imported into RF processor 1151, and the signal down conversion that this RF processor 1151 will receive via antenna is intermediate frequency (IF) signal, and exports the IF signal to analog to digital converter 1153.1153 pairs of analog signals from 1151 outputs of RF processor of analog to digital converter are carried out digital conversion, and export the signal that obtains to protection interval remover 1155 and pilot extractor 1163.Here, will be called from the digital signal of analog to digital converter 1153 outputs

Protection interval remover 1155 is from signal

The middle elimination protected at interval, and exports the signal that obtains to serial-to-parallel transducer 1157.Here, will be called y from the signal of protection interval remover 1155 outputs _l(n).

1157 couples of serial signal y of serial-to-parallel transducer from 1155 outputs of protection interval remover _l(n) conversion that walks abreast, and export the signal that obtains to fft block 1159.1159 pairs of signals from serial-to-parallel transducer 1157 outputs of fft block are carried out N-point FFT, and export the signal that obtains to equalizer 1161 and pilot extractor 1163.Here, will be known as Y from the signal of fft block 1159 outputs ₁(k).

1161 couples of signal Y of equalizer from fft block 1159 outputs ₁(k) carry out channel equalization, and export the signal that obtains to parallel-to-serial transducer 1167.Here, will be called from the signal of equalizer 1161 outputs 1167 pairs of parallel signals of parallel-to-serial transducer from equalizer 1161 outputs

Carry out serial conversion, and export the signal that obtains to symbol de-maps device 1169.Symbol de-maps device 1169 uses the demodulation scheme corresponding with the demodulation scheme that uses in base station equipment 1100 to come the signal of demodulation from parallel-to-serial transducer 1167 outputs, and the signal that output obtains is as the information data position that receives.

And, will be from the signal Y of fft block 1159 outputs ₁(k) input to pilot extractor 1163, and pilot extractor 1163 is from the signal Y of fft block 1159 outputs ₁(k) extract pilot frequency code element in, and the pilot frequency code element that is extracted is exported to synchronously and channel estimator 1165.Synchronously and channel estimator 1165 synchronously and the pilot frequency code element exported from pilot extractor 1163 of channel estimating, and export the result to equalizer 1161.As mentioned above, synchronous and channel extractor 1165 comprises for the pilot frequency mode group each base station, form of forming ofdm communication system, synchronously and channel extractor 1165 determine to mate which pilot frequency mode group in the middle of the described pilot frequency mode group from the pilot frequency modes of pilot extractor 1163 outputs, and the base station corresponding with the pilot frequency mode group of being mated is estimated as those affiliated base stations of mobile station apparatus 1150 itself.And synchronous and channel extractor 1165 is analyzed all pilot frequency mode groups of ofdm communication system in the same manner.

Be appreciated that from top description, the whole frequency band of ofdm communication system is divided into a plurality of subbands, consider coherence bandwidth and coherence time and generate pilot frequency mode for each subband, and produce the pilot frequency mode group for the pilot frequency mode that each subband generates by combination.Discern the base station that comprises in the ofdm communication system with the pilot frequency mode group, thereby increase the quantity of the base station that can be identified.

In addition, the T/F band of ofdm communication system is divided into a plurality of subbands and sub-cycle time forms sub-piece, and,, thereby increased the quantity of the base station that can be identified so that the base station of ofdm communication system is formed in identification for each sub-piece combined pilot pattern.In a word, to finite wireless resources, that is, limited pilot frequency mode resource is divided into groups with effective utilization, thereby helps to improve the whole system performance.

Although illustrated and described the present invention with reference to some preferred embodiment of the present invention, but those of ordinary skill in the art is to be understood that, under the situation that does not deviate from the spirit and scope of the present invention that define by claims, can make the various variations on form and the details.

Claims (80)

1. a generation is identified in the method for the identification of base stations pattern of the base station in the sub-district under the mobile radio station independently, and the reference signal that will be used to discern a plurality of base stations in wireless communication system is sent to mobile radio station from the base station, and described method comprises step:

In the frequency-time-domain given, frequency domain is divided into a plurality of subbands with frequency domain and time domain; With

Determine the reference signal mode at each place in a plurality of subbands.

2. the method for claim 1, wherein said frequency domain is divided into a plurality of subbands, thus in a plurality of subband each has at least one predetermined frequency area.

3. method as claimed in claim 2, wherein each predetermined frequency area is corresponding to the constant maximum frequency domain of wireless channel environment wherein.

4. the method for claim 1, wherein said reference signal mode are to consider that pre-domain is corresponding with the maximum time domain that wherein wireless channel environment is constant and definite.

5. the method for claim 1, wherein each reference signal mode is the slope of the reference signal that sends in pre-domain within a plurality of subbands each.

6. a generation is identified in the equipment of the identification of base stations pattern of the base station in the sub-district under the mobile radio station independently, and the reference signal that will be used to discern a plurality of base stations in wireless communication system is sent to mobile radio station from the base station, and described equipment comprises:

Subband and reference signal mode quantity calculator are used for frequency domain and the given frequency-time-domain of time domain frequency domain being divided into a plurality of subbands, and calculate the reference signal mode at each place in a plurality of subbands; With

Identification of base stations pattern determiner is selected the reference signal mode of predetermined quantity and is made up selected reference signal mode in the middle of the reference signal mode that is used for calculating at each place of a plurality of subbands, thereby produces the identification of base stations pattern that is used to discern the base station.

7. equipment as claimed in claim 6, wherein said frequency band is divided into a plurality of subbands, thus in a plurality of subband each has at least one predetermined frequency area.

8. equipment as claimed in claim 7, wherein each predetermined frequency area is corresponding to the constant maximum frequency domain of wireless channel environment wherein.

9. equipment as claimed in claim 6, wherein said reference signal mode are to consider that pre-domain is corresponding and definite with wherein can the assumed wireless channel circumstance constant maximum time domain.

10. equipment as claimed in claim 6, wherein each reference signal mode is the slope of the reference signal that sends in pre-domain within a plurality of subbands each.

11. equipment as claimed in claim 6, wherein each identification of base stations pattern is one group of slope being represented by selected reference signal mode.

12. method that generates the identification of base stations pattern of the base station that comprises in the independent identification wireless communication system, in described wireless communication system, whole frequency band is divided into a plurality of sub-bands, send reference signal at the sub-band place, and send data-signal at the sub-band place, get rid of the sub-band that sends reference signal, described method comprises step:

Whole frequency band is divided into the subband of predetermined quantity;

Consider that pre-domain and predetermined frequency area calculate the possible reference signal mode at each subband place;

In the middle of the reference signal mode of each subband place calculating, select the reference signal mode of predetermined quantity; With

Be combined in the selected reference signal mode that each subband place is selected, thereby generate the identification of base stations pattern that is used to discern the base station.

13. method as claimed in claim 12, wherein each reference signal mode is the slope of the reference signal of the sub-band place transmission within subband.

14. method as claimed in claim 12, wherein each identification of base stations pattern is one group of slope being represented by selected reference signal mode.

15. method as claimed in claim 12, wherein said pre-domain are the constant maximum time domains of wireless channel environment wherein, and described predetermined frequency area is the constant maximum frequency domain of wireless channel environment wherein.

16. equipment that generates the identification of base stations pattern of the base station that comprises in the independent identification wireless communication system, in described wireless communication system, whole frequency band is divided into a plurality of sub-bands, send reference signal at the sub-band place, and send data-signal at the sub-band place, get rid of the sub-band that sends reference signal, described equipment comprises:

Subband and reference signal mode quantity calculator are used for whole frequency band is divided into the subband of predetermined quantity, and consider that pre-domain and predetermined frequency area calculate the possible reference signal mode at each subband place; With

Identification of base stations pattern determiner, the reference signal mode of selection predetermined quantity in the middle of the reference signal mode that is used for calculating, and the reference signal mode of combination selection at each subband place, thus generate the identification of base stations pattern that is used to discern the base station.

17. equipment as claimed in claim 16 also comprises identification of base stations mode assignments device, is used for determined identification of base stations mode assignments is given the base station of their correspondences.

18. equipment as claimed in claim 16, wherein each reference signal mode is the slope of the reference signal of the sub-band place transmission within each subband.

19. equipment as claimed in claim 16, wherein each identification of base stations pattern is one group of slope being represented by selected reference signal mode.

20. equipment as claimed in claim 16, wherein said pre-domain are the constant maximum time domains of wireless channel environment wherein, and described predetermined frequency area is the constant maximum frequency domain of wireless channel environment wherein.

21. the method for the identification of base stations pattern of the base station in the sub-district that generates under the independent identification mobile radio station, the reference signal that will be used to discern the base station in wireless communication system is sent to mobile radio station from the base station, and described method comprises step:

Form a plurality of sub-pieces by frequency domain being divided into a plurality of subbands, and in the frequency-time-domain given, time domain is divided into a plurality of sub-cycles time with frequency domain and time domain; With

Determine reference signal mode at each sub-piece place.

22. method as claimed in claim 21, wherein said frequency domain is divided into a plurality of subbands, thereby in a plurality of subband each has at least one predetermined frequency area.

23. method as claimed in claim 22, wherein each predetermined frequency area is corresponding to the constant maximum frequency domain of wireless channel environment wherein.

24. method as claimed in claim 21, wherein said time domain are divided into a plurality of sub-cycles time, thereby in a plurality of sub-cycle time each has at least one pre-domain.

25. method as claimed in claim 24, wherein each pre-domain is corresponding to the constant maximum time domain of wireless channel environment wherein.

26. method as claimed in claim 21, wherein said reference signal mode are to consider that predetermined time domain is corresponding with the maximum time domain that wherein wireless channel environment is constant next definite.

27. method as claimed in claim 21, wherein each reference signal mode is the slope of the reference signal that sends in sub-piece, at pre-domain and predetermined frequency area place.

28. an equipment that generates the identification of base stations pattern of the base station in the sub-district of identification under the mobile radio station, the reference signal that will be used to discern the base station in wireless communication system is sent to mobile radio station from the base station, and described equipment comprises:

Sub-piece and reference signal mode quantity calculator, be used for forming a plurality of sub-pieces by frequency domain being divided into a plurality of subbands, and in the frequency-time-domain given, time domain is divided into a plurality of sub-cycles time and calculates reference signal mode at each sub-piece place with frequency domain and time domain; With

Identification of base stations pattern determiner is selected the reference signal mode of predetermined quantity in the middle of the reference signal mode that is used for calculating at each subband place, and is made up selected reference signal mode, thereby generates the identification of base stations pattern that is used to discern the base station.

29. equipment as claimed in claim 28, wherein said frequency domain is divided into a plurality of subbands, thereby in a plurality of subband each has at least one predetermined frequency area.

30. equipment as claimed in claim 29, wherein each predetermined frequency area is corresponding to the constant maximum frequency domain of wireless channel environment wherein.

31. equipment as claimed in claim 28, wherein said time domain are divided into a plurality of sub-cycles time, thereby in a plurality of sub-cycle time each has at least one pre-domain.

32. equipment as claimed in claim 31, wherein each pre-domain is corresponding to the constant maximum time domain of wireless channel environment wherein.

33. equipment as claimed in claim 28, wherein each reference signal mode is the slope of the reference signal that sends in sub-piece, at pre-domain and predetermined frequency area place.

34. method that generates the identification of base stations pattern of the base station that comprises in the independent identification wireless communication system, in described wireless communication system, whole frequency band is divided into a plurality of sub-bands, send reference signal at the sub-band place, and send data-signal at the sub-band place, get rid of the sub-band that sends reference signal, described method comprises step:

Form a plurality of sub-pieces by the subband that whole frequency band is divided into predetermined quantity, and time domain is divided into sub-cycle time of predetermined quantity;

Consider that pre-domain and predetermined frequency area calculate the possible reference signal mode at each sub-piece place;

In the middle of the reference signal mode of each sub-piece place calculating, select the reference signal mode of predetermined quantity; With

Make up selected reference signal mode, thereby determine the identification of base stations pattern of base station.

35. method as claimed in claim 34, wherein each reference signal mode is the slope of the reference signal of the sub-band place transmission within each sub-piece.

36. method as claimed in claim 34, wherein each identification of base stations pattern is one group of slope being represented by selected reference signal mode.

37. method as claimed in claim 34, wherein said pre-domain are the constant maximum time domains of wireless channel environment wherein, and described predetermined frequency area is the constant maximum frequency domain of wireless channel environment wherein.

38. equipment that generates the identification of base stations pattern of the base station that comprises in the independent identification wireless communication system, in described wireless communication system, whole frequency band is divided into a plurality of sub-bands, send reference signal at the sub-band place, and send data-signal at the sub-band place, get rid of the sub-band that sends reference signal, described equipment comprises:

Sub-piece and reference signal mode number generator, be used for forming a plurality of sub-pieces and time domain being divided into sub-cycle time of predetermined quantity, and consider that pre-domain and predetermined frequency area calculate the possible reference signal mode at each sub-piece place by the subband that whole frequency band is divided into predetermined quantity; With

Identification of base stations pattern determiner is selected the reference signal mode of predetermined quantity in the middle of the reference signal mode that is used for calculating at each sub-piece place, and is made up selected reference signal mode, thereby produces the identification of base stations pattern of identification base station.

39. equipment as claimed in claim 38 also comprises identification of base stations mode assignments device, is used for determined identification of base stations mode assignments is given the base station of their correspondences.

40. equipment as claimed in claim 38, wherein each reference signal mode is the slope of the reference signal of the sub-band place transmission within each sub-piece.

41. equipment as claimed in claim 38, wherein each identification of base stations pattern is one group of slope being represented by selected reference signal mode.

42. equipment as claimed in claim 38, wherein said pre-domain are the constant maximum time domains of wireless channel environment wherein, and described predetermined frequency area is the constant maximum frequency domain of wireless channel environment wherein.

43. equipment that sends the identification of base stations pattern of the base station be used for discerning wireless communication system by the base station, in wireless communication system, whole frequency band is divided into a plurality of sub-bands, send reference signal at least one sub-band place, and send data-signal at the sub-band place, get rid of the sub-band that at least one sends reference signal, described equipment comprises:

The identification of base stations mode generator is used to receive parallel data converted signal, generates and identification of base stations pattern corresponding reference signal, and this reference signal is inserted parallel data converted signal;

Contrary fast fourier transform (IFFT) piece is used for the signal of IFFT conversion from the output of identification of base stations mode generator; With

Transmitter is used for the parallel signal that serial conversion IFFT changes, and will be scheduled to the signal that the protection blank signal is inserted serial conversion, and the signal of protecting the interval has been inserted in transmission.

44. equipment as claimed in claim 43, wherein said transmitter comprises:

Serial-to-parallel transducer is used for the parallel signal that serial converted IFFT changes;

Protection is inserter at interval, is used for the protection blank signal is inserted from the serial signal of parallel-to-serial transducer output; With

Radio frequency (RF) processor is used for RF and handles from the signal of protection interval inserter output.

45. equipment as claimed in claim 43, wherein said identification of base stations pattern produces through the following steps: the subband that whole frequency band is divided into predetermined quantity, the consideration scheduled time and bandwidth are selected the reference signal mode of predetermined quantity in the middle of the possible reference signal at each subband place, and make up selected reference signal mode.

46. equipment as claimed in claim 45, wherein each reference signal mode is the slope of the reference signal of the sub-band place transmission within each subband.

47. equipment as claimed in claim 43, wherein said identification of base stations pattern generates through the following steps: the identification of base stations mode time cycle that whole frequency band is divided into the subband of predetermined quantity and will have used the identification of base stations pattern is divided into sub-cycle time of predetermined quantity, thereby form a plurality of sub-pieces, the consideration scheduled time and bandwidth are selected the reference signal mode of predetermined quantity in the middle of the possible reference signal mode at each sub-piece place, and make up selected reference signal mode.

48. equipment as claimed in claim 47, wherein each reference signal mode is the slope of the reference signal of the sub-band place transmission within each sub-piece.

49. equipment as claimed in claim 45, wherein said identification of base stations pattern are one group of slopes being represented by selected reference signal mode.

50. equipment as claimed in claim 47, wherein said identification of base stations pattern are one group of slopes being represented by selected reference signal mode.

51. equipment as claimed in claim 45, the wherein said scheduled time is the constant time of wireless channel environment, and described bandwidth is the constant bandwidth of wireless channel environment.

52. equipment as claimed in claim 47, the wherein said scheduled time is the constant time of wireless channel environment, and described bandwidth is the constant bandwidth of wireless channel environment.

53. method that sends the identification of base stations pattern of the base station be used for discerning wireless communication system by mobile radio station, in wireless communication system, whole frequency band is divided into a plurality of sub-bands, send reference signal at least one sub-band place, and send data-signal at the sub-band place, get rid of the sub-band that sends reference signal, described method comprises step:

Receive parallel data converted signal;

Generate and be used to discern the identification of base stations pattern corresponding reference signal of going to the station to meet somebody;

Reference signal is inserted in parallel data converted signal;

Data converted signal reference signal, parallel has been inserted in IFFT (contrary fast fourier transform) conversion;

The parallel signal of serial conversion IFFT conversion;

Predetermined protection blank signal is inserted the signal of serial conversion; With

Protection signal has at interval been inserted in transmission.

54. method as claimed in claim 53, wherein said identification of base stations pattern generates through the following steps: the subband that whole frequency band is divided into predetermined quantity, the consideration scheduled time and bandwidth are selected the reference signal mode of predetermined quantity in the middle of the possible reference signal at each subband place, and make up selected reference signal mode.

The slope of the reference signal that 55. method as claimed in claim 54, wherein said reference signal mode are the sub-band places within each subband to be sent.

56. method as claimed in claim 53, wherein said identification of base stations pattern generates through the following steps: the identification of base stations mode time cycle that whole frequency band is divided into the subband of predetermined quantity and will have used the identification of base stations pattern is divided into sub-cycle time of predetermined quantity, thereby form a plurality of sub-pieces, consider the scheduled time and bandwidth, in the middle of the possible reference signal mode at each sub-piece place, select the reference signal mode of predetermined quantity, and make up selected reference signal mode.

57. method as claimed in claim 56, wherein said reference signal mode be within each sub-piece, the slope of the reference signal that sends of sub-band place.

58. method as claimed in claim 54, wherein said identification of base stations pattern are one group of slopes being represented by selected reference signal mode.

59. method as claimed in claim 56, wherein said identification of base stations pattern are one group of slopes being represented by selected reference signal mode.

60. method as claimed in claim 54, the wherein said scheduled time is the constant time of wireless channel environment, and described bandwidth is the constant bandwidth of wireless channel environment.

61. method as claimed in claim 56, the wherein said scheduled time is the constant time of wireless channel environment, and described bandwidth is the constant bandwidth of wireless channel environment.

62. equipment that receives the identification of base stations pattern of the base station be used for discerning wireless communication system by mobile radio station, in wireless communication system, whole frequency band is divided into a plurality of sub-bands, send reference signal at least one sub-band place, and send data-signal at the sub-band place, get rid of the sub-band that sends reference signal, described equipment comprises:

Receiver be used for eliminating the protection blank signal at predetermined period from the signal that receives, and protection signal has at interval been eliminated in parallel conversion;

The fast Fourier transform (FFT) piece is used for the signal of FFT conversion from receiver output;

The reference signal extractor is used for extracting reference signal from the signal of FFT conversion; With

Synchronously and channel estimator, be used for the reference signal base stations detected recognition mode that extracts from the reference signal extractor and the base station under the identification mobile radio station.

63. equipment as claimed in claim 62, wherein said receiver comprises:

The protection interval remover is used for eliminating the protection blank signal from the signal that receives; With

Serial-to-parallel transducer is used for parallel conversion and has eliminated protection serial signal at interval.

64. equipment as claimed in claim 62, wherein said identification of base stations pattern produces through the following steps: the subband that whole frequency band is divided into predetermined quantity, consider the scheduled time and bandwidth, in the middle of the possible reference signal at each subband place, select the reference signal mode of predetermined quantity, and make up selected reference signal mode.

65. as the described equipment of claim 64, wherein said reference signal mode is the slope of the reference signal of the sub-band place transmission within each subband.

66. equipment as claimed in claim 62, wherein said identification of base stations pattern generates through the following steps: the identification of base stations mode time cycle that whole frequency band is divided into the subband of predetermined quantity and will have used the identification of base stations pattern is divided into sub-cycle time of predetermined quantity, thereby form a plurality of sub-pieces, the consideration scheduled time and bandwidth are selected the reference signal mode of predetermined quantity in the middle of the possible reference signal mode at each sub-piece place, and make up selected reference signal mode.

67. as the described equipment of claim 66, wherein said reference signal mode is the slope of the reference signal of the sub-band place transmission within each sub-piece.

68. as the described equipment of claim 64, wherein said identification of base stations pattern is one group of slope being represented by selected reference signal mode.

69. as the described equipment of claim 66, wherein said identification of base stations pattern is one group of slope being represented by selected reference signal mode.

70. as the described equipment of claim 64, the wherein said scheduled time is the constant time of wireless channel environment, and described bandwidth is the constant bandwidth of wireless channel environment.

71. as the described equipment of claim 66, the wherein said scheduled time is the constant time of wireless channel environment, and described bandwidth is the constant bandwidth of wireless channel environment.

72. method that receives the identification of base stations pattern of the base station be used for discerning wireless communication system by mobile radio station, in wireless communication system, whole frequency band is divided into a plurality of sub-bands, send reference signal at least one sub-band place, and send data-signal at the sub-band place, get rid of the sub-band that sends reference signal, described method comprises step:

From the signal that receives, eliminate the protection blank signal at predetermined period;

Protection signal has at interval been eliminated in parallel conversion;

The signal of the parallel conversion of FFT (fast fourier transform) conversion;

From the signal of FFT conversion, extract reference signal;

Base stations detected recognition mode from the reference signal of being extracted; With

Base station under the identification mobile radio station.

73. as the described method of claim 72, wherein said identification of base stations pattern generates through the following steps: the subband that whole frequency band is divided into predetermined quantity, the consideration scheduled time and bandwidth are selected the reference signal mode of predetermined quantity at each subband place, in the middle of possible reference signal, and make up selected reference signal mode.

74. as the described method of claim 73, wherein said reference signal mode is the slope of the reference signal that sends in each subband, at the sub-band place.

75. as the described method of claim 72, wherein said identification of base stations pattern generates through the following steps: the identification of base stations mode time cycle that whole frequency band is divided into the subband of predetermined quantity and will have used the identification of base stations pattern is divided into sub-cycle time of predetermined quantity, thereby form a plurality of sub-pieces, consider the scheduled time and bandwidth, select the reference signal mode of predetermined quantity at each sub-piece place, in the middle of possible reference signal mode, and make up selected reference signal mode.

76. as the described method of claim 75, wherein said reference signal mode is the slope of the reference signal of the sub-band place transmission in each sub-piece.

77. as the described method of claim 73, wherein said identification of base stations pattern is one group of slope being represented by selected reference signal mode.

78. as the described method of claim 75, wherein said identification of base stations pattern is one group of slope being represented by selected reference signal mode.

79. as the described method of claim 73, the wherein said scheduled time is the constant time of wireless channel environment, and described bandwidth is the constant bandwidth of wireless channel environment.

80. as the described method of claim 75, the wherein said scheduled time is the constant time of wireless channel environment, and described bandwidth is the constant bandwidth of wireless channel environment.

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