CN101283533A - Wireless communication base station device and pilot transmitting method - Google Patents
Wireless communication base station device and pilot transmitting method Download PDFInfo
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Abstract
A base station realizing enhancement of the interpolation accuracy of the channel estimate between sub-frames. In a base station (100), a scrambling section (105) carries out scrambling such that a predetermined pilot signal sequence is multiplied by a scrambling sequence containing both a sequence unique to the base station (100) and different with cells and a sequence common to base stations for each chip and generates a pilot sequence containing both a pilot for unicast sub-frame and a pilot for multicast sub-frame, a multiplexing section (106) for time-multiplexing the pilot sequence, the unicast data symbol, and a multicast data symbol for each sub-frame, and an S/P section (107) converts the pilot sequences, the unicast data symbols, and the multicast data symbols sequential serially inputted from the multiplexing section (106) the numbers of which are equal to the number of subcarries included in one OFDM symbol into parallel ones and outputs them to an IFFT section (108).
Description
Technical field
The present invention relates to radio communication base station device and pilot sending method.
Background technology
In recent years, in mobile communication, except voice, various information such as image and data also become the object of transmission.Accompany therewith, the more and more necessary of reliability height and transmission at a high speed increases.But when carrying out high-speed transfer in mobile communication, the influence of the delay ripple that is produced by multipath is very important, because frequency selective fading, transmission characteristic worsens.
As one of technology of frequency selective fading countermeasure, (Orthogonal FrequencyDivision Multiplexing: OFDM) mode is that the multi-carrier communication of representative gets most of the attention with OFDM.Multi-carrier communication is, is suppressed to not a plurality of subcarrier transmission data of degree that can the decline of occurrence frequency selectivity by using transmission speed, thereby carries out the technology of high-speed transfer.Especially the OFDM mode is orthogonal because of the frequency of a plurality of subcarriers of configuration data, thus the highest in multi-carrier communication medium frequency utilization ratio, and can realize with fairly simple hardware configuration.Therefore, the OFDM mode gets most of the attention as the communication means that adopts in honeycomb mode mobile communication, and it is carried out various investigations.In addition, in the OFDM mode,, the rear end part of each OFDM code element is attached to the beginning of this OFDM code element as Cyclic Prefix (CP:Cyclic Prefix) in order to prevent intersymbol interference (ISI:Intersymbol Interference).Thus, at receiving terminal,, just can prevent ISI as long as when postponing in the time span that is housed in CP time of delay (below, be called CP length) of ripple.
On the other hand, at present in the investigation of carrying out cast communication.Cast communication is not the man-to-man communication as unicast communication, but the communication of one-to-many.That is to say that in cast communication, radio communication base station device (below, be called the base station) sends to identical data a plurality of radio communication mobile station devices (below, be called travelling carriage) simultaneously.By this cast communication, in mobile communication system, the broadcast service of the service of broadcasting of realization music data and vedio data and television broadcasting etc. etc.In addition, as the service that utilizes cast communication to carry out, because imagined service, so in cast communication for the wider communication zone that can't cover fully by a base station, by sending identical data from a plurality of base stations, thereby cover its wider whole communication zone.Therefore, the data of cast communication (multicast packet) utilize the multicast channel by the public use in a plurality of base stations to be transmitted.Like this, in multicast channel, send identical data simultaneously from a plurality of base stations, so, under mixed state, be received from the multicast packet of a plurality of base stations near the travelling carriage that is arranged in the cell boarder.
Here, when the OFDM mode is used for cast communication, at near the travelling carriage that is arranged in the cell boarder, if to receive a plurality of identical OFDM code element that sends from a plurality of base stations simultaneously with interior time difference in CP length, then these OFDM code elements be synthesized and also state that received power is exaggerated under be received.For by channel estimating, the channel estimation value of the signal after needing synthesize is proofreaied and correct in the propagation path change (phase place change and amplitude change) of the signal that synthesized like this.Therefore, also identical even to being used to ask the employed pilot tone of channel estimation value in the cast communication that utilizes the OFDM mode with multicast packet, must send identical pilot tone from a plurality of base stations simultaneously.
On the other hand, in unicast tunnel, a plurality of base stations send mutually different data (unicast data) (with reference to non-patent literature 1).Therefore, to unicast data multiply by each different base station of each sub-district intrinsic scrambled code, can in travelling carriage, respectively the unicast data from a plurality of base stations being distinguished.Therefore, also identical to being used to ask the employed pilot tone of channel estimation value in unicast communication with unicast data, multiply by each base station intrinsic scrambled code.
In addition, discussing following technical scheme, promptly as shown in Figure 1, it is time-multiplexed that unicast data and multicast packet with the subframe are that unit carries out, and with unicast tunnel and multicast channel along with the time is switched use (with reference to non-patent literature 2) at any time.According to the document, represented to constitute the example of a frame by 20 subframes of subframe # 1～#20.In addition, in the beginning of each subframe, mutually different between unicast data and multicast packet, aforesaid pilot tone (P) is by time-multiplexed.In addition, in Fig. 1, as an example, per three frame structures that the subframe multicast packet is re-used of having given an example.
[non-patent literature 1] 3GPP RAN WG1 LTE Adhoc meeting (2005.06) R1-050589 " Pilot channel and scrambling code in evolved UTRA downlink "
[non-patent literature 2] 3GPP RAN WG1 LTE Adhoc meeting (2005.06) R1-050590 " Physical channels and multiplexing in evolved UTRA downlink "
Summary of the invention
Problem to be addressed by invention
Here, as shown in Figure 1, pilot tone in the beginning of subframe when time-multiplexed, the channel estimation value that utilizes this pilot tone to try to achieve is used for the data of whole this subframe, thus higher at the beginning part correction accuracy of subframe, with respect to this, to the rear end, correction accuracy reduces more gradually along with more.In order to suppress the reduction of this precision, can consider between subframe, to carry out the interpolation processing of channel estimation value.For example, in Fig. 1, carrying out interpolation between the channel estimation value that calculates by the channel estimation value that calculates in the pilot tone of utilizing subframe # 1 and the pilot tone of utilizing subframe # 2 handles, ask channel estimation value for the unicast data of subframe # 1, carrying out interpolation between the channel estimation value that calculates by the channel estimation value that calculates in the pilot tone of utilizing subframe # 2 and the pilot tone of utilizing subframe # 3 handles, ask channel estimation value for the unicast data of subframe # 2, and carry out interpolation between the channel estimation value that calculates by the channel estimation value that calculates in the pilot tone of utilizing subframe # 3 and the pilot tone of utilizing subframe #4 and handle, ask channel estimation value for the multicast packet of subframe # 3.
Yet, as mentioned above, sent mutually different pilot tone in the subframe of unicast data and the subframe of multicast packet, so in travelling carriage, in the subframe of unicast data, ask for based on from this mobile communications in the channel estimation value of pilot tone of a base station, with respect to this, in the subframe of multicast packet, ask for based on channel estimation value from the synthetic signal of the pilot tone warp of a plurality of base stations.Therefore, the state of a propagation path of channel estimating value representation of in the subframe of unicast data, asking for, with respect to this, the channel estimation value of asking in the subframe of multicast packet is the mixed value of the state of a plurality of propagation paths.Therefore, handle if carry out aforesaid interpolation between these channel estimation values, then interpolation precision significantly reduces.Therefore, using the channel estimation value of obtaining by the interpolation processing to carry out timing to received signal, its precision significantly reduces, its result, and error rate characteristic worsens.More specifically, in Fig. 1, interpolation between channel estimation value of obtaining from the pilot tone of subframe #2 (unicast data) and the channel estimation value obtained from the pilot tone of subframe #3 (multicast packet) is handled, because interpolation precision is lower, so the error rate characteristic of the unicast data of subframe # 2 worsens.In addition, similarly, interpolation between channel estimation value of asking for from the pilot tone of subframe #3 (multicast packet) and the channel estimation value asked for from the pilot tone of subframe #4 (unicast data) is handled, because interpolation precision is lower, so the error rate characteristic of the multicast packet of subframe # 3 worsens.
Like this, carrying out unicast data and multicast packet time-multiplexed, and when between has carried out the interpolation processing of channel estimation value, in the subframe of the previous unicast data of the subframe that is right after multicast packet, produce the deterioration of error rate characteristic, in the subframe of the previous multicast packet of the subframe that is right after unicast data, produce the deterioration of error rate characteristic.
The object of the present invention is to provide base station and pilot sending method, it can improve the interpolation precision of the channel estimation value between subframe.
The scheme that addresses this problem
Base station of the present invention is, first subframe and second subframe are being carried out employed base station in the time-multiplexed wireless communication system, described first subframe is used to be sent between a plurality of sub-districts or mutually different data between a plurality of sectors, described second subframe is used to be sent between described a plurality of sub-district or mutual identical data between described a plurality of sectors, the structure that adopt this base station comprises: generate the generation unit of first pilot frequency sequence, the pilot tone both sides that described first pilot frequency sequence comprises the pilot tone that is used for described first subframe and is used for described second subframe; And with the multiplexing Multiplexing Unit in described second subframe of described first pilot frequency sequence.
The effect of invention
According to the present invention, can improve the interpolation precision of the channel estimation value between subframe.
Description of drawings
Fig. 1 represents frame structure example (prior art).
Fig. 2 represents the block diagram of the base station of embodiment of the present invention 1.
Fig. 3 represents the block diagram of the travelling carriage of embodiment of the present invention 1.
Fig. 4 represents the multiplexing example of the pilot frequency sequence of embodiment of the present invention 1 (sub-district A).
Fig. 5 represents the example (sub-district B) of the multiplexed pilot sequence of embodiment of the present invention 1.
Fig. 6 represents the reception pilot frequency sequence of embodiment of the present invention 1.
Fig. 7 represents the channel estimation value of embodiment of the present invention 1.
Fig. 8 represents the block diagram (change) of the base station of embodiment of the present invention 1.
Fig. 9 represents the example of the generation scrambled code sequence of embodiment of the present invention 1.
Figure 10 represents the example (change 1) of the multiplexed pilot sequence of embodiment of the present invention 1.
Figure 11 represents the example (change 2) of the multiplexed pilot sequence of embodiment of the present invention 1.
Figure 12 represents the example (change 3) of the multiplexed pilot sequence of embodiment of the present invention 1.
Figure 13 represents the example (change 4) of the multiplexed pilot sequence of embodiment of the present invention 1.
Figure 14 represents the example (change 5) of the multiplexed pilot sequence of embodiment of the present invention 1.
Figure 15 represents the example (change 6) of the multiplexed pilot sequence of embodiment of the present invention 1.
Figure 16 represents the block diagram of the base station of embodiment of the present invention 2.
Figure 17 represents the block diagram (change) of the base station of embodiment of the present invention 2.
Figure 18 represents the structure chart of the cell set of embodiment of the present invention 3.
Figure 19 represents the example (sub-district M) of the multiplexed pilot sequence of embodiment of the present invention 3.
Figure 20 represents the example (sub-district N) of the multiplexed pilot sequence of embodiment of the present invention 3.
Figure 21 represents the block diagram of the base station of embodiment of the present invention 3.
Figure 22 represents the example (antenna #1) of the multiplexed pilot sequence of embodiment of the present invention 5.
Figure 23 represents the example (antenna #2) of the multiplexed pilot sequence of embodiment of the present invention 5.
Embodiment
Below, explain embodiments of the present invention with reference to accompanying drawing.
(execution mode 1)
The base station of present embodiment is the base station of using in following wireless communication system, will be used for a plurality of base stations and send the subframe of mutually different data and be used for the subframe that a plurality of base stations send identical mutually data and carry out time-multiplexed in this wireless communication system.The base station of present embodiment is particularly suitable for following wireless communication system, and also promptly as above-mentioned Fig. 1, the subframe (below, be called unicast sub) that will be used for unicast data and the frame that is used for multicast packet (below, be called the multicast subframe) carry out time-multiplexed system.Therefore, in the following description, with unicast sub as being used for the subframe that a plurality of base stations send mutually different data, and be that an example describes as being used for the subframe that a plurality of base stations send identical mutually data with the multicast subframe.In addition, frame structure in the present embodiment is identical with Fig. 1.
Fig. 2 represents the structure of the base station 100 of present embodiment, and Fig. 3 represents the structure of the travelling carriage 200 of present embodiment.
In base station shown in Figure 2 100,101 pairs of unicast datas of coding unit are encoded, and output to modulating unit 102.
Unicast data behind 102 pairs of codings of modulating unit is modulated and is generated the unicast data code element, and outputs to Multiplexing Unit 106.
103 pairs of multicast packets of coding unit are encoded, and output to modulating unit 104.
Multicast packet behind 104 pairs of codings of modulating unit is modulated and is generated the multicast packet code element, and outputs to Multiplexing Unit 106.
Scrambling unit 105 carries out scrambling to be handled and the generation pilot frequency sequence, and output to Multiplexing Unit 106, described scrambling is handled, to comprise a plurality of sub-districts mutually different base station 100, each sub-district public sequence (common sequence) both sides' scramble sequence in intrinsic sequence (intrinsic sequence) and a plurality of base station, every chip multiply by the processing of the pilot signal sequence of regulation, and described pilot frequency sequence comprises the pilot tone that is used for unicast sub and is used for the pilot tone both sides of multicast subframe.
The number of sub ground that is equivalent to comprise in each OFDM code element, S/P unit 107 will be parallel from pilot frequency sequence, unicast data code element and the multicast packet symbol transformations of the input of Multiplexing Unit 106 serial successively, and (Inverse Fast Fourier Transform: invert fast fourier transformation) unit 108 to output to IFFT.Thus, pilot frequency sequence, unicast data code element or multicast packet code element are assigned to each subcarrier that constitutes the OFDM code element.
A plurality of subcarriers that 108 pairs of IFFT unit have been assigned with pilot frequency sequence, unicast data code element or multicast packet code element carry out IFFT and are transformed to the signal of time domain, and generating multi-carrier signal is the OFDM code element.This OFDM code element is imported into CP extra cell 109.
CP extra cell 109 will the signal identical with the end portion of OFDM code element appends to the beginning of OFDM code element as CP.
OFDM code element behind the 110 couples of additional CP in wireless transmission unit is carried out D/A, and (Digital/Analog: conversion digital-to-analog), amplification and up-conversion etc. send to be handled, and sends to travelling carriage 200 (Fig. 3) from antenna 111.
In travelling carriage shown in Figure 3 200, wireless transmission unit 202 receives the OFDM code element that 100 (Fig. 2) send from the base station by antenna 201, the OFDM code element that receives is carried out down-conversion and A/D, and (Analog/Digital: analog/digital) reception of conversion etc. is handled, and outputs to CP and remove unit 203.
CP removes unit 203 and remove the CP that is added in the OFDM code element, and (FastFourier Transform: fast fourier transform) unit 204 to output to FFT.
The OFDM code elements that unit 203 inputs are removed by CP in 204 pairs of FFT unit are carried out FFT and are transformed to the signal of frequency domain, obtain pilot frequency sequence, unicast data code element or multicast packet code element, and its part parallel that is equivalent to number of sub is outputed to P/S (Parallel/Serial: parallel/serial) unit 205.
P/S unit 205 will 204 parallel pilot frequency sequence, unicast data code element or the multicast packet symbol transformations of importing be serial from the FFT unit, and output to taxon 206.
206 pairs of pilot frequency sequences of taxon and data symbols are classified, and pilot frequency sequence is outputed to pilot tone selected cell 207, and unicast data code element and multicast packet code element are outputed to correcting unit 209.
Pilot tone selected cell 207 is selected from pilot frequency sequence and the corresponding pilot signal of kind of carrying out the data of channel estimating.When pilot tone selected cell 207 outputs to correcting unit 209 in the unicast data code element by taxon 206, that is to say, in unicast sub, selection is used for the pilot tone of unicast sub and outputs to channel estimating unit 208, and when the multicast packet code element outputs to correcting unit 209 by taxon 206, that is to say that in the multicast subframe, selection is used for the pilot tone of multicast subframe and outputs to channel estimating unit 208.In addition, in travelling carriage 200, the channel estimation value between subframe is carried out interpolation handle, so pilot tone selected cell 207 is selected the pilot tone of current subframe and next subframe.For example, when the unicast data to subframe #2 shown in Figure 1 had carried out channel estimating, pilot tone selected cell 207 selected to be used for the pilot tone of unicast sub from subframe #2 and the pilot frequency sequence that is arranged in the beginning of subframe #3.In addition, for example, when the multicast packet to subframe #3 shown in Figure 1 had carried out channel estimating, pilot tone selected cell 207 selected to be used for the pilot tone of multicast subframe from the pilot frequency sequence of the beginning that is arranged in subframe #3 and subframe #4.
Correcting unit 209 utilizes the channel estimation value that is calculated by channel estimating unit 208, the propagation path change of unicast data code element and multicast packet code element is proofreaied and correct, and output to demodulating unit 210.Correcting unit 209 multiplies each other by the complex conjugate with each data symbols and channel estimation value, thereby the propagation path change of each data symbols is proofreaied and correct.
210 pairs of each data symbols from correcting unit 209 inputs of demodulating unit are carried out demodulation, and output to decoding unit 211.
Each data symbols after 211 pairs of demodulation of decoding unit is decoded.Thus, obtain to receive data.
Then, illustrate that the scrambling in the scrambling unit 105 of base station 100 handles the generation method of employed scramble sequence.As follows, this scramble sequence is by generating the part that intrinsic sequence is a scrambled code with the common sequence displacement.
That is to say, with base station 100 intrinsic scrambled code be made as chip a
1, a
2, a
3..., a
N(wherein, N is the number of the subcarrier that comprises in an OFDM code element), common sequence is made as chip s
1, s
2, s
3..., s
M(wherein, M＜N/2) and with pilot signal sequence be made as p
1, p
2, p
3..., p
NThe time, for example, with second chip of scrambled code as starting point, be positioned at the common sequence displacement per three chips the position each chip and generate scramble sequence.Therefore, the scramble sequence that is generated here is a
1, s
1, a
3, a
4, s
2, a
6..., s
M..., a
N, in this scramble sequence, comprise intrinsic sequence and common sequence both sides.In addition, in scrambling unit 105, for pilot signal sequence p
1, p
2, p
3..., p
N, multiply by this scramble sequence a
1, s
1, a
3, a
4, s
2, a
6..., s
M..., a
NTherefore, the pilot frequency sequence that generates by this multiplication process is a
1P
1, s
1P
2, a
3P
3, a
4P
4, s
2P
5, a
6P
6..., s
MP
3M-1..., a
NP
NHere, in order to be easy to explanation, if use p
1=p
2=p
3=...=p
N=1 sequence is as pilot signal sequence, then as mentioned above and scramble sequence (a that generates
1, s
1, a
3, a
4, s
2, a
6..., s
M..., a
N) itself become pilot frequency sequence.Then, as shown in Figure 4, by Multiplexing Unit 106, with this pilot frequency sequence a
1, s
1, a
3, a
4, s
2, a
6..., s
M..., a
NMultiplexing beginning in each subframe.In Fig. 4,, suppose N=6, and represent that an OFDM code element is by subcarrier f in order to be easy to explanation
1～f
6Six subcarriers situation about constituting.Therefore, in Fig. 4, because a
1, a
3, a
4, a
6Become base station 100 intrinsic pilot tone, so can use as the pilot tone that is used for unicast sub, on the other hand because s
1, s
2Become the public pilot tone in a plurality of base stations, so can use as the pilot tone that is used for the multicast subframe.Like this, in the pilot frequency sequence that generates by scrambling unit 105, comprise pilot tone that is used for unicast sub and the pilot tone both sides that are used for the multicast subframe.
Further, as mentioned above, in pilot frequency sequence, comprise a plurality of pilot tone s that are used for the multicast subframe
iThe time, these pilot tones are set in the coherence bandwidth of propagation path at the interval on the frequency domain, so that when carrying out channel estimating in travelling carriage 200, can follow the propagation path change on the frequency domain direction of principal axis fully.Therefore, scrambling unit 105 generates pilot frequency sequence, and described pilot frequency sequence is at the pilot tone s that is used for the multicast subframe
1And s
2Between frequency domain on the interval be housed in sequence in the coherence bandwidth of propagation path.
In addition, the pilot tone that is used for the multicast subframe is identical in a plurality of base stations, so can not produce the interference between the base station.Therefore, in pilot frequency sequence, be used for the number of the pilot tone of multicast subframe, get final product so long as can follow the MIN number of propagation path change.On the other hand, the pilot tone that is used for unicast sub is different in each base station, so produce the interference between the base station.For by this interference of attenuating such as equalization processing, need a plurality of pilot tones.Therefore, in the present embodiment, as mentioned above, in pilot frequency sequence, the number that is used for the pilot tone of unicast sub is set to more than the number of the pilot tone that is used for the multicast subframe.Here, the pilot tone that is used for the multicast subframe is s
1And s
2Two, with respect to this, the pilot tone that is used for unicast sub is a
1, a
3, a
4And a
6Four pilot frequency sequence, they generate by scrambling unit 105.
The calculating of the channel estimation value that carries out in the channel estimating unit 208 of travelling carriage 200 then, is described.Here, suppose as shown in Figure 4 that the base station 100 of sub-district A is with pilot frequency sequence a
1, s
1, a
3, a
4, s
2And a
6Beginning in each subframe sends, and as shown in Figure 5, adopts the base station 100 of the sub-district B of same structure to send the pilot frequency sequence b that generates as described above in the beginning of each subframe
1, s
1, b
3, b
4, s
2And b
6In addition, suppose that travelling carriage 200 is positioned at sub-district A.
As shown in Figure 6, in travelling carriage 200, pilot frequency sequence a
1, s
1, a
3, a
4, s
2And a
6With pilot frequency sequence b
1, s
1, b
3, b
4, s
2And b
6On propagation path, be synthesized and be received.Therefore, the pilot frequency sequence that receives in travelling carriage 200 is a
1h
1+ b
1l
1, s
1(h
2+ l
2), a
3h
3+ b
3l
3, a
4h
4+ b
4l
4, s
2(h
5+ l
5) and a
6h
6+ b
6l
6Wherein, h
iBe illustrated in the propagation path among the A of sub-district, l
iBe illustrated in the propagation path among the B of sub-district.That is to say that the pilot frequency sequence that receives becomes s at the pilot portion that is used for the multicast subframe in travelling carriage 200
i(h
i+ l
i), and become a at the pilot portion that is used for unicast sub
ih
i+ b
il
i
In addition, channel estimating unit 208 calculating channel estimated value as shown in Figure 7.
That is to say, to multicast packet (data of subframe #3) when carrying out channel estimating, as mentioned above,, select subcarrier f by the reception pilot frequency sequence of pilot tone selected cell 207 from the beginning that is arranged in subframe #3
2And f
5Reception pilot tone s
1(h
2+ l
2) and s
2(h
5+ l
5).Channel estimating unit 208 is passed through pilot tone s
1(h
2+ l
2) and s
1Complex conjugate multiply each other and ask channel estimation value g
2=h
2+ l
2, and pass through pilot tone s
2(h
5+ l
5) and s
2Complex conjugate multiply each other and ask channel estimation value g
5=h
5+ l
5In subframe #4, also carried out same processing, thereby can obtain g
2And g
5In addition, as shown in Figure 7, channel estimating unit 208 has been utilized g in the beginning of subframe #3 and subframe #4
2And g
5The interpolation between subcarrier handle, ask the remaining channel estimation value g in the beginning of subframe #3 and subframe #4
1, g
3, g
4And g
6In addition, as shown in Figure 7, channel estimating unit 208 is carried out for channel estimation value g between the beginning of the beginning of subframe #3 and subframe #4
1～g
6The interpolation of each estimated value handle, calculate channel estimation value for all multicast packet code elements that in subframe #3, comprise.
On the other hand, to unicast data (data of subframe #2) when carrying out channel estimating, as mentioned above,, select subcarrier f by the reception pilot frequency sequence of pilot tone selected cell 207 from the beginning that is arranged in subframe # 2
1, f
3, f
4And f
6Reception pilot tone a
1h
1+ b
1l
1, a
3h
3+ b
3l
3, a
4h
4+ b
4l
4And a
6h
6+ b
6l
6As the formula (1), channel estimating unit 208 is with pilot tone a
1h
1+ b
1l
1With a
1Complex conjugate multiply each other, simultaneously with pilot tone a
3h
3+ b
3l
3With a
3Complex conjugate multiply each other, and with these multiplied result additions.In addition, between the subcarrier of adjacency, can be considered propagation path much at one, so in formula (1), with h
1+ h
3Be made as 2h
1
Formula (1)
Here, if a
1, a
3, b
1And b
3For mutually at random, then their are not strengthened mutually, so second value in the result of calculation of formula (1) becomes and 2h
1Compare enough little value, can ignore this value thus.Therefore, the result of calculation of formula (1) becomes 2h
1Thereby, can ask channel estimation value h
1Like this, channel estimating unit 208 is when the channel estimation value of asking for unicast data, in order to suppress interference components l
i, between the subcarrier of adjacency, carry out the equalization of channel estimation value and handle.
In addition, in the above description, in calculating, utilize to receive pilot tone s for the channel estimation value of unicast data code element
1(h
2+ l
2) and s
2(h
5+ l
5), but near travelling carriage 200 is positioned at the center of sub-district A, and h
iValue and l
iValue compare enough when big, also utilize these to receive pilot tones and ask channel estimation value for the unicast data code element, precision of channel estimation improves thus.
Like this, according to present embodiment, because base station 100 sends pilot frequency sequence in each subframe, described pilot frequency sequence comprises the pilot tone that is used for unicast sub and is used for the pilot tone both sides of multicast subframe, so in travelling carriage 200, as mentioned above, can carry out interpolation mutually between the channel estimation value of the state of representing a propagation path handles, can carry out simultaneously interpolation between the mixed channel estimation value of the state of a plurality of propagation paths mutually handles, even thereby, also can improve interpolation precision with unicast tunnel and multicast channel being unit when carrying out interpolation that time-multiplexed and between carried out channel estimation value and handling with the subframe.Therefore, according to present embodiment, the lower and deterioration of the error rate characteristic that causes of the interpolation precision that can prevent channel estimation value.
In addition, according to present embodiment, only handle by simple, just can generate pilot frequency sequence, described processing is the sequence that will generate with the part of common sequence displacement scrambled code in the past and in the past pilot signal sequence multiplies each other, and described pilot frequency sequence comprises the pilot tone that is used for unicast sub and is used for the pilot tone both sides of multicast subframe.
In addition,, can pass through single pilot configuration, unicast data and multicast packet both sides be carried out channel estimating, thereby can realize easy communication system according to present embodiment.
In addition, in the above description, the situation that is multiplexed in the beginning (first OFDM code element) of each subframe with pilot frequency sequence is that an example is illustrated, but for example be multiplexed in each subframe at the first bruss in control information etc., also can pilot frequency sequence is multiplexing after second OFDM code element of each subframe.
In addition, in the above description, only pilot signal sequence multiply by scramble sequence, but also can multiply by scramble sequence unicast data code element and multicast packet code element.Perhaps, also can to unicast data code element and multicast packet code element multiply by base station 100 intrinsic scrambled code.
In addition, in the above description, generated scramble sequence, generated scramble sequence but also can be inserted between the chip of scrambled code by chip with each common sequence by a part with common sequence displacement scrambled code.
In addition, also can get little than the transmission power determining of the pilot tone that is used for unicast sub the transmitted power that is used for the pilot tone of multicast subframe.Because total transmitted power of base station 100 has the upper limit, so by reducing between the base station, not produce mutually the transmitted power of the pilot tone of disturbing that is used for the multicast subframe, and and its correspondingly be increased between the base station transmitted power that produces the pilot tone of disturbing that is used for unicast sub mutually, can suppress the deterioration of the error rate characteristic of the unicast data that causes by interference.
In addition, in the above description, illustrated that the scramble sequence that generates in advance is set in the base station 100, and the situation that scramble sequence does not change, but sometimes by the radio network controller device of the high level that is positioned at base station 100 (below, be called control desk) change in the wireless communication system of intrinsic sequence (scrambled code), also the structure of base station can be made as structure as shown in Figure 8.Base station 300 shown in Figure 8 is in structure shown in Figure 2, has also appended permute unit 301.Intrinsic sequence and common sequence are notified by control desk in base station 300, permute unit 301 by as an above-mentioned part of similarly replacing this intrinsic sequence with this common sequence generate scramble sequence.In addition, in this structure, the scramble sequence that is generated in permute unit 301 multiply by pilot signal sequence, but also can with scrambled code directly and pilot signal sequence multiply each other and after generating pilot frequency sequence, the part of this pilot frequency sequence is replaced with common sequence by permute unit 301.
In addition, when being divided into a plurality of sector, be set the pilot signal sequence of the different separately regulation in each sector sometimes a sub-district.In addition, for example use OVSF (Orthogonal Variable Spreading Factor: Orthogonal Variable Spreading Factor OVSF) orthogonal sequence of sequence etc. is as the situation of the pilot signal sequence of regulation in order to lower the phase mutual interference between the sector, to have.At this moment, the orthogonal sequence that is used for each sector is public in all sub-districts.Therefore, at this moment, to these pilot frequency sequences (orthogonal sequence) multiply by different base station, each sub-district intrinsic scrambled code.In such wireless communication system, as shown in Figure 9, replace with in the chip of scrambled code (intrinsic sequence) with the public common sequence in all sub-districts, phase place (1 in all sectors in the chip of each sector pilot signals sequence,-1) the identical corresponding part of chip gets final product thereby generate scramble sequence.Thus, even to each constitute the sub-district a plurality of sector settings during different separately pilot signal sequences, also with above-mentioned same, can generate the scramble sequence that comprises intrinsic sequence and common sequence both sides, and can generate pilot frequency sequence, described pilot frequency sequence comprises the pilot tone that is used for unicast sub and is used for the pilot tone both sides of multicast subframe.
In addition, in the above description, as shown in Figure 4, with the multiplexing beginning of pilot frequency sequence in all subframes, do not disturb but in the multicast subframe, between the base station, do not produce mutually, and multicast packet is more with the situation of the less modulation system modulation of order of modulation such as QPSK, so the multicast packet code element is not easy to be subjected to the influence of propagation path change, described pilot frequency sequence comprises the pilot tone that is used for unicast sub and is used for the pilot tone both sides of multicast subframe.Therefore, as shown in figure 10, also can will comprise pilot tone that is used for unicast sub and the only multiplexing beginning of pilot frequency sequence that is used for the pilot tone both sides of multicast subframe in the multicast subframe, and the multiplexing beginning in unicast sub of pilot frequency sequence that will only constitute by the pilot tone that is used for unicast sub.Perhaps, as shown in figure 11, also can pilot tone that be used for unicast sub and the pilot frequency sequence that is used for the pilot tone both sides of multicast subframe will be comprised, only multiplexing in the multicast subframe beginning and the beginning of the unicast sub behind this multicast subframe tight, and the beginning of the multiplexing unicast sub at other of the pilot frequency sequence that will be only constitutes by the pilot tone that is used for unicast sub.Perhaps, as shown in figure 12, also can pilot tone that be used for unicast sub and the pilot frequency sequence that is used for the pilot tone both sides of multicast subframe will be comprised, only multiplexing beginning in the multicast subframe, the general is only multiplexing in the rear end of multicast subframe by the pilot frequency sequence that the pilot tone that is used for the multicast subframe constitutes simultaneously, and the multiplexing beginning in unicast sub of pilot frequency sequence that will only be made of the pilot tone that is used for unicast sub.Thus, can be increased in the number of the pilot tone that is used for unicast sub on the frequency domain, so can improve channel estimated accuracy to the unicast data code element.In addition, under the situation of carrying out like this, permute unit 301 shown in Figure 8 is except above-mentioned processing, also intrinsic sequence or common sequence are directly outputed to scrambling unit 105 as scramble sequence, scrambling unit 105 multiplies each other this scramble sequence and pilot signal sequence, thereby only generates pilot frequency sequence that is made of the pilot tone that is used for unicast sub or the pilot frequency sequence that only is made of the pilot tone that is used for the multicast subframe.
In addition, in the above description, as shown in Figure 4, the pilot tone that will be used for the multicast subframe be made as in the position on the frequency domain all subframes identical (in Fig. 4, subcarrier f
2And f
5), but as shown in figure 13, the every subframe in this position is changed.That is to say, also can will be used for each pilot frequency sequence of the mutually different a plurality of pilot frequency sequences in position of the pilot tone of multicast subframe, the beginning of multiplexing each subframe in unicast sub and multicast subframe.Thus, be not used in the subcarrier of the pilot tone of multicast subframe, promptly the subcarrier of precision of channel estimation difference in a plurality of subframes continuously, so in all subcarrier upper signal channel estimated accuracies by equalization, can improve error rate characteristic.In addition, under the situation of carrying out such processing, permute unit 301 shown in Figure 8 when replacing intrinsic sequence a part of with common sequence, makes in intrinsic sequence each subframe of position with the chip of common sequence displacement change except above-mentioned processing.Thus, scrambling unit 105 can generate a plurality of pilot frequency sequences, and described a plurality of pilot frequency sequences are the mutually different sequences in position that are used for the pilot tone of multicast subframe.
In addition, in order to improve the interpolation precision of channel estimation value on time-axis direction further, as shown in figure 14, and except pilot frequency sequence is multiplexing the beginning of each subframe, can also be with the multiplexing position outside beginning of pilot frequency sequence.Under the situation of carrying out such processing, only need be in unicast sub for the channel estimation value of unicast data code element, and only need be in the multicast subframe for the channel estimation value of multicast packet code element, so as shown in figure 14, to comprise pilot tone that is used for unicast sub and the pilot frequency sequence that is used for the pilot tone both sides of multicast subframe, multiplexing beginning in each subframe, with respect to this, in unicast sub, with the multiplexing pilot frequency sequence of position beyond beginning as the pilot frequency sequence that only constitutes by the pilot tone that is used for unicast sub, in the multicast subframe, with the multiplexing pilot frequency sequence of position beyond beginning as the pilot frequency sequence that only constitutes by the pilot tone that is used for the multicast subframe.
In addition, pilot tone is not mapped on all subcarriers that comprise in the OFDM code element, as shown in figure 14, can shines upon discontinuously yet.In example shown in Figure 14, per two sub-carrier mapped pilot tones.Under the situation of carrying out such processing, in the beginning of each subframe, to not shining upon the sub-carrier mapped data symbols of pilot tone.
In addition, also multiplexed pilot sequence as shown in Figure 15 is to replace the multiplexing method of Figure 14.In example shown in Figure 15, with the multiplexing beginning of pilot frequency sequence that only constitutes in each subframe by the pilot tone that is used for unicast sub, with respect to this, pilot frequency sequence with multiplexing position beyond the beginning of each subframe, as comprising pilot tone that is used for unicast sub and the pilot frequency sequence that is used for the pilot tone both sides of multicast subframe, this respect is different with example shown in Figure 14.
(execution mode 2)
In execution mode 1, the channel estimation value g that when the channel estimating of carrying out multicast packet, calculates
i, be the channel estimation value h in the A of sub-district as mentioned above
iWith the channel estimation value l in the B of sub-district
iMixed and the channel estimation value that obtains is so can't be used for this channel estimation value channel estimating to unicast data.
Therefore, in the present embodiment, in the intrinsic sequence and common sequence that in scramble sequence, comprises, give each different base station of each sub-district intrinsic phase place rotation to common sequence.
Figure 16 represents the structure of the base station 500 of present embodiment.Base station 500 also has phase place rotary unit 501 and 502 and constitute except the structure shown in the execution mode 1 (Fig. 2).In addition, in Figure 16, to partly giving same numeral, and omit explanation with Fig. 2 same structure.
In base station shown in Figure 16 500, in the intrinsic sequence and common sequence that phase place rotary unit 501 comprises in scramble sequence, common sequence is given each sub-district, is that different base station, each base station 500 intrinsic phase places are rotated.If common sequence is made as chip s
1, s
2, s
3..., s
M, and with base station 500 intrinsic the amount of phase rotation be made as θ, then the postrotational common sequence of phase place becomes s
1Exp (j θ), s
2Exp (j θ), s
3Exp (j θ) ..., s
MExp (j θ).Then, the scramble sequence that comprises the common sequence of carrying out phase place rotation is imported into scrambling unit 105.
Like this, rotate, can distinguish to the pilot tone that is used for the multicast subframe in the A of sub-district with in the pilot tone that is used for the multicast subframe of sub-district B by common sequence being given different base station, each sub-district 500 intrinsic phase places.Therefore, in travelling carriage, can calculate the channel estimation value h in the A of sub-district respectively based on the reception pilot tone that is used for the multicast subframe
iWith the channel estimation value l in the B of sub-district
iThereby, can utilize further at these channel estimation values h
i, l
iIn one, unicast data is carried out channel estimating.Thus, can improve the precision of channel estimation of unicast data.
Here, because given the phase place rotation, in travelling carriage, the channel estimation value that calculates based on the pilot tone that is used for the multicast subframe can't be directly used in the channel estimating of multicast packet to common sequence.Therefore, phase place rotary unit 502 with the amount of phase rotation identical to the amount of phase rotation of common sequence, give phase place rotation to the multicast packet code element.Like this, also by the multicast packet code element also being given the phase place rotation identical with common sequence, make in the pilot tone that is used for the multicast subframe and be used for relationship consistency between the phase place of multicast packet code element, so in travelling carriage, can utilize the channel estimation value that calculates based on the pilot tone that is used for the multicast subframe, carry out the channel estimating of multicast packet.
Therefore, in the present embodiment, the s of subframe # 3 shown in Figure 4
1, s
2Be multiplied by exp (j θ with multicast packet
a), the s of subframe # 3 shown in Figure 5
1, s
2Be multiplied by exp (j θ with multicast packet
b).
In addition, each base station intrinsic the amount of phase rotation be set in advance in each base station, perhaps, by the control desk of the high level that is positioned at each base station notice.
In addition, in the travelling carriage of present embodiment, have only the action of pilot tone selected cell 207 different with execution mode 1.That is to say that in the present embodiment, when the channel estimating of carrying out unicast data, pilot tone selected cell 207 is chosen in and receives all pilot tones that comprise in the pilot frequency sequence, and outputs to channel estimating unit 208.
In addition, in the above description, illustrated that the scramble sequence that generates in advance is set in the base station 500, and the situation that scramble sequence does not change, but, also the structure of base station can be made as structure as shown in figure 17 changed the wireless communication system of intrinsic sequence (scrambled code) sometimes by the control desk of the high level that is arranged in base station 500.Permute unit 301 has also been appended in base station 700 shown in Figure 17 except structure shown in Figure 16.This permute unit 301 is identical with unit in the execution mode 1 (Fig. 8), so omit explanation.
In addition, in the above description, illustrated that in the base station 500 intrinsic the amount of phase rotation are one situation, promptly base station 500 intrinsic the amount of phase rotation of sub-district A are θ
a, base station 500 intrinsic the amount of phase rotation of sub-district B are θ
bSituation, but a base station also can use a plurality of the amount of phase rotation.For example, the amount of phase rotation θ also can be used in the base station 500 of sub-district A
A1And θ
A2, and the amount of phase rotation θ is used in the base station 500 of sub-district B
B1And θ
B2At this moment, for example, in Fig. 4, with the s of subframe #3
1With subcarrier f
1～f
3Multicast packet and exp (j θ
A1) multiply each other, simultaneously with the s of subframe #3
2With subcarrier f
4～f
6Multicast packet and exp (j θ
A2) multiply each other, in Fig. 5, with the s of subframe #3
1With subcarrier f
1～f
3Multicast packet and exp (j θ
B1) multiply each other, simultaneously with the s of subframe #3
2With subcarrier f
4～f
6Multicast packet and exp (j θ
B2) multiplying each other gets final product.Thus, in each sub-district, can make the interference randomization between the pilot tone that is used for the multicast subframe.
(execution mode 3)
In the present embodiment, a plurality of cell set that each is made of a plurality of sub-districts mutually are described, send the situation of mutually different multicast packet.In the present embodiment, for example shown in Figure 180, imagination is constituting cell set 1 by sub-district A～G, when constituting cell set 2 by sub-district H～N, in the A～G of the sub-district of cell set 1, send multicast packet 1, with respect to this, in the H～N of the sub-district of cell set 2, send the situation of the multicast packet 2 different with multicast packet 1.
At this moment, if be used for the same position of the pilot frequency configuration of multicast subframe in all sub-districts, in (at Figure 18, being sub-district A, B, M and N), the precision of channel estimation of anticipation multicast packet worsens then in the sub-district that is arranged in the cell set border.For example, anticipation is in the sub-district of cell set 1 A and B, and the precision of channel estimation of multicast packet 1 worsens, and in the sub-district of cell set 2 M and N, the precision of channel estimation of multicast packet 2 worsens.This is because if disposed the pilot tone that is used for the multicast subframe on the same position in all sub-districts in adjacent cell set, then in the sub-district that is arranged in the cell set border, to being used for the pilot tone of multicast subframe, it is big that the interference between the adjacent group becomes.For example, the pilot tone that is used for the multicast subframe in sub-district A and B is subjected to bigger interference from the pilot tone that is used for the multicast subframe of cell set 2, similarly, the pilot tone that is used for the multicast subframe in sub-district M and N is subjected to bigger interference from the pilot tone that is used for the multicast subframe of cell set 1.
Therefore, in the present embodiment, as shown in Figure 4, multiplexing pilot frequency sequence a in sub-district 1
1, s
1, a
3, a
4, s
2And a
6, as shown in Figure 5, multiplexing pilot frequency sequence b in the B of sub-district
1, s
1, b
3, b
4, s
2And b
6The time, as shown in figure 19, multiplexing pilot frequency sequence m in the M of sub-district
1, m
2, s
1, m
4, m
5And s
2, as shown in figure 20, multiplexing pilot frequency sequence n in the N of sub-district
1, n
2, s
1, n
4, n
5And s
2That is to say, in the present embodiment, make the position of pilot tone on frequency domain that between adjacent mutually cell set, is used for the multicast subframe different.Thus,, can lower the interference between the adjacent group, so can prevent deterioration in the precision of channel estimation of the multicast packet of the sub-district that is arranged in the cell set border to being used for the pilot tone of multicast subframe.In addition, similarly, can prevent the deterioration of certainty of measurement of the line quality of multicast channel.
Figure 21 represents the structure of the base station 900 of present embodiment.The permute unit 301 of present embodiment is when replacing intrinsic sequence a part of with common sequence, according to the cell set sequence number, each cell set makes the position of the chip of replacing with common sequence in intrinsic sequence different, and this respect is different with the permute unit 301 of the base station 300 of Fig. 8.
For example, the permute unit 301 of the base station 900 of sub-district A is transfused to cell set sequence number 1, so at pilot frequency sequence a
1, a
2, a
3, a
4, a
5And a
6In, with a
2Be replaced into s
1, and with a
5Be replaced into s
2Similarly, the permute unit 301 of the base station 900 of sub-district B is transfused to cell set sequence number 1, so at pilot frequency sequence b
1, b
2, b
3, b
4, b
5And b
6In, with b
2Be replaced into s
1, and with b
5Be replaced into s
2
On the other hand, the permute unit 301 of the base station 900 of sub-district M is transfused to cell set sequence number 2, so at pilot frequency sequence m
1, m
2, m
3, m
4, m
5And m
6In, with m
3Be replaced into s
1, and with m
6Be replaced into s
2Similarly, the permute unit 301 of the base station 900 of sub-district N is transfused to cell set sequence number 2, so at pilot frequency sequence n
1, n
2, n
3, n
4, n
5And n
6In, with n
3Be replaced into s
1, and with n
6Be replaced into s
2
Adopt such structure by base station 900, can make the position of pilot tone on frequency domain that between adjacent mutually cell set, is used for the multicast subframe different.
(execution mode 5)
In the above-described embodiment, illustrated that the antenna that the base station has is one a situation, but in the present embodiment, illustrated that the base station has a plurality of antennas, and in a sub-district, from the situation of a plurality of antenna transmission multicast packets.
For example, when having two antennas of antenna # 1 and antenna # 2 in the base station of sub-district A, in the present embodiment, with pilot frequency sequence a as shown in figure 22
1, null, a
3, null, s
2With the multiplexing beginning of null in each subframe that sends from antenna # 1, and general pilot frequency sequence null as shown in figure 23, s
1, null, a
4, null and a
6Multiplexing beginning in each subframe that sends from antenna #2.Then, the travelling carriage that receives simultaneously two pilot frequency sequences that send from antenna # 1 and antenna # 2, these pilot frequency sequences are synthesized, thereby can obtain pilot frequency sequence shown in Figure 4.Therefore, even have a plurality of antennas in the base station, and in a sub-district during from a plurality of antenna transmission multicast packet, as mentioned above, also can share each part that sends pilot frequency sequence, obtain effect and the effect identical with above-mentioned execution mode by each antenna that makes a plurality of antennas.
More than, embodiments of the present invention have been described.
In addition, change by " multicast " that will in the explanation of above-mentioned execution mode, use and to read to be " broadcasting ", can switch at any time along with the time and in the wireless communication system that is used, similarly implement the present invention with above-mentioned at unicast tunnel and broadcast channel.Cast communication adopts as only specific travelling carriage is carried out the communication mode that information sends, described specific travelling carriage is the travelling carriage that newsgroup (news group) etc. has added this service, with respect to this, the broadcast communication employing is carried out the communication mode that information sends as present television broadcasting or radio broadcasting etc. to all travelling carriages.In addition, sometimes multicast channel and broadcast channel are called MBMS (Multimedia Broadcast/Multicast Service: multimedia broadcast multicast services) channel in the lump.
In addition, for PCH (Paging Channel: paging channel) and BCH (Broadcast Channel: broadcast channel) etc. beyond the multicast channel, between a plurality of sectors the channel of public mutually other, also can similarly implement the present invention with above-mentioned.
In addition, the pilot tone of using in the explanation of above-mentioned execution mode that is used for unicast sub also can be in public guide frequency or the indivedual pilot tone.
In addition, the subframe of using in the explanation of above-mentioned execution mode is called as time slot or TTI (Transmission Time Interval: Transmission Time Interval) sometimes.In addition, CP is called as protection (GI:Guard Interval) at interval sometimes.In addition, subcarrier is called as tone (tone) sometimes.In addition, the base station is represented as Node B (Node B) sometimes, and travelling carriage is represented as UE (User Equipment: subscriber equipment).In addition, pilot tone is called as contrast signal sometimes.In addition, multicast channel is called as SFN (SingleFrequency Network: single frequency network) channel sometimes.In addition, the subframe of using in the explanation of above-mentioned execution mode also can be other transmitting time unit of for example time slot or frame etc.
In addition, in the above-described embodiment, the situation of the present invention of implementing has been described between the sub-district, but with above-mentioned a plurality of sectors that similarly can generate a cell division being become a plurality of between implement the present invention.
In addition, in the above-described embodiment, expression is that unit separates the time-multiplexed situation of carrying out to multicast channel with unicast tunnel with the subframe, but, also can similarly implement the present invention in identical subframe with above-mentioned in the situation that multicast channel and unicast tunnel are separated with frequency or time.At this moment, also can only the present invention be applicable to the subcarrier that multicast channel is re-used.
In addition, in the above-described embodiment, constitute situation of the present invention with hardware and describe as an example, but the present invention can realize with software.
In addition, each functional block that is used for the explanation of above-mentioned each execution mode LSI of being used as integrated circuit usually realizes.These pieces both can be integrated into a chip individually, were integrated into a chip with also can comprising part or all.Though be called LSI herein,, can be called as IC, system LSI, super large LSI (Super LSI), especially big LSI (Ultra LSI) according to the difference of integrated level.
In addition, realize that the method for integrated circuit is not limited only to LSI, also can use special circuit or general processor to realize.Also can use LSI make the programmable FPGA in back (Field ProgrammableGate Array: field programmable gate array), the perhaps reconfigurable processor of the connection of the circuit unit of restructural LSI inside and setting.
Moreover, along with semi-conductive technological progress or the appearance of other technology of derivation thereupon,, can utilize this new technology to carry out the integrated of functional block certainly if the new technology of the integrated circuit of alternative LSI can occur.Also exist the possibility that is suitable for biotechnology etc.
This specification is willing to 2005-295446 number based on the Japanese patent application laid of application on October 7th, 2005 and the Japanese patent application laid of application on October 5th, 2006 is willing to 2006-273583 number.Its content all is contained in this.
Industrial applicibility
The present invention can be applicable to GSM etc.
Claims (15)
1. radio communication base station device, first subframe and second subframe are being carried out employed radio communication base station device in the time-multiplexed wireless communication system, described first subframe is used to be sent between a plurality of sub-districts or mutually different data between a plurality of sectors, described second subframe be used to be sent between described a plurality of sub-district or between described a plurality of sectors mutual identical data, this radio communication base station device comprises:
Generation unit generates first pilot frequency sequence, the pilot tone both sides that described first pilot frequency sequence comprises the pilot tone that is used for described first subframe and is used for described second subframe; And
Multiplexing Unit, described first pilot frequency sequence is multiplexing in described second subframe.
2. radio communication base station device as claimed in claim 1, wherein,
Described first subframe is the subframe that is used for unicast data, and described second subframe is the subframe that is used for multicast packet.
3. radio communication base station device as claimed in claim 1, wherein,
Described generation unit generates described first pilot frequency sequence, and in described first pilot frequency sequence, the number of pilot tone that is used for described first subframe is more than the number of the pilot tone that is used for described second subframe.
4. radio communication base station device as claimed in claim 1, wherein,
Described generation unit multiply by scramble sequence and generates described first pilot frequency sequence the pilot signal sequence of regulation, and described scramble sequence comprises the second public sequence both sides in the first different sequence of each sectors of each sub-districts of described a plurality of sub-districts or described a plurality of sectors and described a plurality of sub-district or the described a plurality of sector.
5. radio communication base station device as claimed in claim 4, wherein,
Described scramble sequence is to replace the part of described first sequence and the sequence that generates with described second sequence.
6. radio communication base station device as claimed in claim 1, wherein,
Described generation unit multiply by scramble sequence to the pilot signal sequence of the different regulation in each sector of a plurality of sectors of constituting the sub-district and generates described first pilot frequency sequence, and described scramble sequence comprises the second public sequence both sides in the first different sequence of each sub-districts of described a plurality of sub-districts and the described a plurality of sub-district.
7. radio communication base station device as claimed in claim 6, wherein,
Described scramble sequence is to replace the part of described first sequence and the sequence that generates with described second sequence.
8. radio communication base station device as claimed in claim 1, wherein,
Described Multiplexing Unit is also multiplexing in described first subframe with described first pilot frequency sequence.
9. radio communication base station device as claimed in claim 1, wherein,
Described generation unit generates described first pilot frequency sequence, and this first pilot frequency sequence comprises a plurality of pilot tones that are used for described second subframe, and their intervals on frequency domain are housed in the coherence bandwidth of propagation path.
10. radio communication base station device as claimed in claim 1, wherein,
Described generation unit also generates second pilot frequency sequence that only is made of the pilot tone that is used for described first subframe,
Described Multiplexing Unit is multiplexing in described second subframe and be right after in thereafter described first subframe with described first pilot frequency sequence, and described second pilot frequency sequence is multiplexing in other described first subframe.
11. radio communication base station device as claimed in claim 1, wherein,
Described generation unit generates a plurality of described first pilot frequency sequences, and in described first pilot frequency sequence, the position of pilot tone that is used for described second subframe is different,
Each sequence of a plurality of described first pilot frequency sequence that described Multiplexing Unit will generate is multiplexing in each described first subframe and described second subframe.
12. radio communication base station device as claimed in claim 1, wherein,
Described generation unit also generates second pilot frequency sequence that only is made of the pilot tone that is used for described first subframe,
Described Multiplexing Unit is the multiplexing beginning in described first subframe of described first pilot frequency sequence, and with the also multiplexing position beyond described beginning of described second pilot frequency sequence.
13. radio communication base station device as claimed in claim 1, wherein,
Described generation unit also generates the 3rd pilot frequency sequence that only is made of the pilot tone that is used for described second subframe,
Described Multiplexing Unit is the multiplexing beginning in described second subframe of described first pilot frequency sequence, and with the also multiplexing position beyond described beginning of described the 3rd pilot frequency sequence.
14. radio communication base station device as claimed in claim 1 wherein, also comprises:
The phase place rotary unit to pilot tone and the described identical data both sides mutually that are used for described second subframe, gives the different phase place rotation in each sector of each sub-district or described a plurality of sectors of described a plurality of sub-districts.
15. pilot sending method, be that first subframe and second subframe are being carried out employed pilot sending method in the time-multiplexed wireless communication system, described first subframe is used to be sent between a plurality of sub-districts or mutually different data between a plurality of sectors, described second subframe is used to be sent between described a plurality of sub-district or mutual identical data between described a plurality of sectors, wherein
Send pilot frequency sequence in described second subframe, described pilot frequency sequence comprises the pilot tone that is used for described first subframe and is used for the pilot tone both sides of described second subframe.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005295446 | 2005-10-07 | ||
| JP295446/2005 | 2005-10-07 | ||
| JP273583/2006 | 2006-10-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101283533A true CN101283533A (en) | 2008-10-08 |
Family
ID=40014958
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006800371081A Pending CN101283533A (en) | 2005-10-07 | 2006-10-06 | Wireless communication base station device and pilot transmitting method |
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| CN (1) | CN101283533A (en) |
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| CN101753511B (en) * | 2008-12-03 | 2013-01-23 | 株式会社Ntt都科摩 | Signal generation device and method |
| CN104735792A (en) * | 2013-12-23 | 2015-06-24 | 华为技术有限公司 | Method and device for distributing pilot frequency resources |
| CN106209713A (en) * | 2015-05-06 | 2016-12-07 | 北京信威通信技术股份有限公司 | A kind of demodulation method in radio communication |
| US10218481B2 (en) | 2009-04-22 | 2019-02-26 | Lg Electronics Inc. | Apparatus and method for transmitting a reference signal in a wireless communication system |
| CN110324121A (en) * | 2018-03-28 | 2019-10-11 | 上海朗帛通信技术有限公司 | It is a kind of be used for wirelessly communicate communication node in method and apparatus |
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- 2006-10-06 CN CNA2006800371081A patent/CN101283533A/en active Pending
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| CN101753511B (en) * | 2008-12-03 | 2013-01-23 | 株式会社Ntt都科摩 | Signal generation device and method |
| US10218481B2 (en) | 2009-04-22 | 2019-02-26 | Lg Electronics Inc. | Apparatus and method for transmitting a reference signal in a wireless communication system |
| CN102414999B (en) * | 2009-04-22 | 2014-12-24 | Lg电子株式会社 | Apparatus and method for transmitting reference signal in wireless communication system |
| CN102414999A (en) * | 2009-04-22 | 2012-04-11 | Lg电子株式会社 | Apparatus and method for transmitting reference signal in wireless communication system |
| US11005627B2 (en) | 2009-04-22 | 2021-05-11 | Lg Electronics Inc. | Apparatus and method for transmitting a reference signal in a wireless communication system |
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