WO2009090869A1 - 無線送信装置及び無線送信方法 - Google Patents
無線送信装置及び無線送信方法 Download PDFInfo
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- WO2009090869A1 WO2009090869A1 PCT/JP2009/000111 JP2009000111W WO2009090869A1 WO 2009090869 A1 WO2009090869 A1 WO 2009090869A1 JP 2009000111 W JP2009000111 W JP 2009000111W WO 2009090869 A1 WO2009090869 A1 WO 2009090869A1
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- preamble
- signal
- subcarrier
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
- H04J11/0083—Multi-mode cell search, i.e. where several modes or systems can be used, e.g. backwards compatible, dual mode or flexible systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/068—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission using space frequency diversity
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- the present invention relates to a wireless transmission device and a wireless transmission method, and more particularly to a method of transmitting a preamble.
- a mobile terminal In a wireless cellular system typified by a mobile phone or the like, a mobile terminal (UE) first transmits a known signal called a preamble to the base station (Node-B) in order to access the cellular network.
- the preamble has two main roles. One is to identify a mobile terminal in an area (cell) covered by the base station, and the other is to detect a transmission timing shift of the mobile terminal.
- the transmission timing detection needs to be performed at the base station because it is difficult to adjust the transmission timing of the mobile terminal alone. This will be described.
- the timing at the time of reception at the base station must not be the same. This is because in mobile communication systems, pilot signals and control signals are periodically transmitted from the base station on the downlink, so that the transmission timing can be determined based on the downlink signal. Since the time to reach the terminal and the time to reach the base station from each mobile terminal differ in proportion to the distance between the base station and each mobile terminal, the reception timing at the base station is consequently different. Because it will end up.
- the base station Since it is difficult for a mobile terminal alone to accurately measure its own radio wave propagation delay time with the base station and adjust the transmission timing, the base station receives the preamble and detects the reception timing shift. Each mobile terminal is notified of transmission timing correction according to the timing shift. In this way, transmission timing correction (transmission time alignment) is performed.
- the base station does not know when to receive the preamble.
- Each mobile terminal can determine the preamble transmission timing based on the downlink signal, so that the preamble reception range can be kept within a certain range, but the base station still has a deviation based on the propagation delay difference with each mobile terminal. It is necessary to receive in consideration.
- the preamble is detected by always taking the correlation between the time waveform replica of all the preamble signals expected to be received and the received signal (or in the entire range in consideration of the reception timing deviation).
- the corresponding mobile terminal is notified of the detection of the preamble and the transmission timing correction value.
- 3GPP TS 36.211 V8.0.0 (2007-09) “3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical channels and modulation (Release 8)”, 5.7 Physical random access channel .
- JSST-MM2007-20 "Random access burst design and evaluation in Evolved-UTRA", DaichiIMAMURA, Katsuhiko HIRAMATSU, Tomohumi TAKATA, Takashi IWAI.
- the base station since it is not known whether the preamble is transmitted until it is detected by the base station, even if the detection of the preamble fails, it is generally reported that the non-detection status such as NACK is notified from the base station to the mobile terminal. Is not done.
- the mobile terminal that has transmitted the preamble retransmits the preamble if there is no notification from the base station after a predetermined time has elapsed after transmission. In this case, increasing the transmission power of the preamble is often performed.
- the base station does not know the fact that it has received the first preamble when it fails to detect the preamble, so it combines with the first received signal like HARQ. That is not usually done.
- the base station is required to accurately detect the preamble with a single reception.
- the present invention has been made in consideration of such points, and provides a wireless transmission device and a wireless transmission method capable of improving the reception characteristics of a preamble.
- One aspect of the wireless transmission device of the present invention includes a preamble sequence generation unit that generates a preamble sequence signal, a weighting unit that weights the preamble sequence signal with a weight vector using a plurality of antennas, and the weighted signal. Are arranged at random subcarrier intervals.
- the periodicity on the time axis in the OFDM symbol can be reduced.
- the preamble reception characteristics are improved, and the timing detection accuracy based on the preamble is improved.
- Diagram for explaining the cause of timing detection error 2A is a diagram illustrating subcarriers in which a preamble is arranged, and FIG. 2B is a diagram illustrating autocorrelation characteristics in the time domain.
- FIG. 3A is a diagram showing subcarriers in which a preamble is arranged, and FIG. 3B is a diagram showing autocorrelation characteristics in the time domain.
- 4A is a diagram showing subcarriers in which a preamble is arranged, and FIG. 4B is a diagram showing autocorrelation characteristics in the time domain.
- FIG. 5A is a diagram showing subcarriers in which a preamble is arranged, and FIG. 5B is a diagram showing autocorrelation characteristics in the time domain.
- FIG. 11A to 11E are diagrams showing arrangement patterns of preambles on subcarriers in Embodiment 2.
- FIGS. 13A and 13B are diagrams showing arrangement patterns of preambles on subcarriers in Embodiment 3.
- FIG. 17A is a diagram showing examples of precoding weights used in PVS
- FIG. 17B is a diagram showing antenna arrangement.
- positioning in PVS The figure which shows the example of preamble arrangement
- OFDMA OrthogonalequFrequency Division Multiplexing ⁇ ⁇ Access
- SC-FDMA Single-Carrier
- the inventors considered that it is preferable that the mobile terminal performs diversity transmission using a plurality of transmission antennas in order to improve the reception characteristics (detection performance) of the preamble.
- the inventors may use PVS (Precoding Vector Switching), CDD (Cyclic Delay Digital Diversity), FSTD (Frequency Switched Transmit Transmit Diversity), and TSTD (Frequency Switched Transmit Transmit Diversity). I thought I liked it.
- PVS Precoding Vector Switching
- CDD Cyclic Delay Digital Diversity
- FSTD Frequency Switched Transmit Transmit Diversity
- TSTD Frequency Switched Transmit Transmit Diversity
- PVS, CDD, FSTD, and TSTD are diversity transmissions that can be demodulated even if the base station that receives the preamble does not know the number of transmission antennas of each mobile terminal.
- STBC Space-Time Block Code
- SFBC Space-Frequency Block Code
- CDS and FSTD are methods for obtaining a diversity effect by one reception detection among PVS, CDD, FSTD, and TSTD.
- CDD was considered to have the possibility that the characteristics would be deteriorated in the case of a narrow band, and FSTD was considered most preferable.
- each transmission antenna uses equally spaced subcarriers. For example, when there are two transmission antennas, a signal arranged only on even-numbered subcarriers is transmitted from one antenna, and a signal arranged only on odd-numbered subcarriers is transmitted from the other antenna.
- a waveform using evenly spaced subcarriers causes a timing detection error because a repeated waveform appears in the OFDM symbol. For example, consider a case where there are two transmission antennas, a signal in which a preamble is arranged only on even subcarriers is transmitted from one antenna, and a signal in which a preamble is arranged only on odd subcarriers is transmitted from the other antenna.
- FIG. 1 shows the situation.
- FIG. 1 is a diagram focusing on only one antenna for the sake of simplicity, but the same applies to the case where the number of antennas is two. However, if the number of antennas is two, diversity gain can be obtained accordingly.
- the first half (period t1 to t2) and second half (period t2 to t3) has the same shape. Therefore, when correlation is detected using a replica on the receiving side, the correlation peak of the main wave occurs at two locations (“correct detection position” and “side lobe” in the figure), which causes a timing detection error. .
- IFFT inverse Fourier transform
- FIG. 2A, FIG. 3A, FIG. 4A, and FIG. 5A show to which subcarriers of the first transmission antenna Tx1 and the second transmission antenna Tx2 the preamble is arranged.
- 2B, 3B, 4B, and 5B show autocorrelation characteristics obtained on the receiving side.
- the horizontal axis indicates sampling points within one OFDM symbol section, and the vertical axis indicates autocorrelation values.
- Example 1 As shown in FIG. 2A, for antenna Tx1, half of the transmission band is odd subcarriers (..., -9, -7, ...) and the other half is even subcarriers (2, 4, ). ) Was placed in the preamble. Similarly, for the antenna Tx2, the preamble is allocated to even-numbered subcarriers (..., -10, -8, ...) for half of the transmission band and the odd-numbered subcarriers (1, 3, ...) for the other half. In this case, as shown in FIG. 2B, a plurality of side lobes occurred near the center of the symbol.
- Example 2 As shown in FIG. 3A, preambles were alternately arranged on the antenna Tx1 and the antenna Tx2 every two subcarriers. In this case, as shown in FIG. 3B, side lobes were generated at two locations across the center of the symbol.
- Example 3 As shown in FIG. 4A, preambles are alternately arranged on the antenna Tx1 and the antenna Tx2 every three subcarriers. In this case, as shown in FIG. 4B, side lobes were generated at the central portion of the symbol and at two locations sandwiching it.
- Example 4 As shown in FIG. 5A, preambles are arranged in the antenna Tx1 and the antenna Tx2 in units of 2 subcarriers or 3 subcarriers. In this case, as shown in FIG. 5B, side lobes occurred at two locations across the center of the symbol.
- the inventors considered that the peak value of the side lobe increases in the autocorrelation value of the time waveform when the proportion of equally spaced subcarriers increases as the subcarrier used.
- the gist of the present invention is to randomize the interval between subcarriers in which the preamble is arranged.
- the preamble is not arranged on subcarriers that are equally spaced.
- the periodicity on the time axis in the OFDM symbol can be reduced. Therefore, when the autocorrelation value of the preamble sequence is obtained in the time domain on the receiving side, the peak value of the side lobe is reduced. As a result, timing detection errors can be prevented.
- FIG. 6 shows an arrangement pattern of preambles on subcarriers of the OFDM signal in the present embodiment.
- the subcarrier pattern in which preamble sequence signals are continuously arranged is changed in the frequency direction. Specifically, 1, 2, 3, 5, 6, 7, 8, 11,..., 36, 38,... Transmitted from the first transmission antenna Tx1 are assigned preambles on the subcarriers. .., 39, 40, 41,..., Which are transmitted from the second transmitting antenna Tx2, are arranged in the subcarriers. And the preamble arrange
- 1 continuous subcarrier (4) 2 continuous subcarriers (9, 10), 3 continuous subcarriers (12, 13, 14), 4 continuous subcarriers (19, 20, 21) , 22), two consecutive subcarriers (26, 27), two consecutive subcarriers (30, 31), two consecutive subcarriers (34, 35), one continuous subcarrier (37), and three consecutive subcarriers (39, 40). , 41),...,
- the subcarrier pattern in which the preamble is continuously arranged changes in the frequency direction.
- the subcarrier in which the preamble is arranged in the transmission antenna Tx1 does not arrange the preamble in the transmission antenna Tx2, and conversely the transmission antenna Tx1 in the subcarrier in which the preamble is arranged in the transmission antenna Tx2. Then, the preamble is not arranged. In this way, the preamble is arranged in a complementary manner between the antennas. That is, in this embodiment, FSTD is used as diversity transmission.
- FIG. 7 shows the autocorrelation characteristics of the preamble on the receiving side when the preamble is arranged as shown in FIG. As can be seen from FIG. 7, no large peak appears except for a large peak appearing at the head position of the symbol. Therefore, timing detection errors can be prevented.
- FIG. 8 shows a configuration example of a transmission apparatus for performing the transmission method described above.
- the transmission apparatus in FIG. 8 is mounted on a mobile terminal, for example.
- a control signal transmission system including a pilot signal transmission system, an encoding unit, a modulation unit, and the like.
- a data transmission system is also installed.
- the preamble sequence signal generated by the preamble sequence generation unit 101 is input to the transmission antenna sequences of the antenna Tx1 and the antenna Tx2. Incidentally, for example, a different preamble sequence signal is generated between terminals.
- Subcarrier selection sections 103-1 and 103-2 place the preamble sequence at the subcarrier position to be used (the input position of IFFT) and output it to IFFT 104-1 and 104-2 in accordance with the instruction from subcarrier selection instruction section 102. To do.
- subcarrier selection section 103-1 arranges the preamble sequence at the subcarrier position indicated by Tx1 in FIG. 6, and subcarrier selection section 103-2 determines the subcarrier position indicated by Tx2 in FIG.
- the preamble sequence is placed in and output.
- IFFTs Inverse Fourier Transform Units
- 104-1 and 104-2 form an OFDM signal that is a time waveform signal by performing inverse Fourier transform on the signals input from the subcarrier selection units 103-1 and 103-2.
- the OFDM signal is subjected to radio processing by the RF units 105-1 and 105-2, and then transmitted from the antennas Tx1 and Tx2.
- FIG. 9 shows a configuration example of a receiving apparatus that receives the preamble transmitted from the transmitting apparatus in FIG.
- the receiving apparatus in FIG. 9 is mounted on a base station, for example.
- FIG. 9 shows only the configuration related to preamble reception, an actual base station is also equipped with a data reception system including a demodulation unit, a decoding unit, and the like.
- the signal received by the antenna Rx1 is wirelessly processed by the RF unit 201 and then input to the preamble correlation calculation unit 202.
- the preamble replica generation unit 203 generates or holds all the preamble waveform temporal waveform replicas that may be received, and supplies this to the preamble correlation calculation unit 202.
- the preamble correlation calculation unit 202 obtains a correlation (that is, an autocorrelation value) between the time waveform replica of the supplied preamble sequence and the received signal.
- the preamble detection determination and reception timing detection unit 204 determines which preamble has been detected based on the presence and position of a correlation peak equal to or greater than the threshold in the autocorrelation value obtained by the preamble correlation calculation unit 202, and the preamble Detection of a shift in reception timing.
- the above-described preamble arrangement it is possible to suppress the occurrence of a plurality of peaks exceeding the threshold within one OFDM symbol, so that it is possible to detect a shift in reception timing without error.
- the preamble sequence generated by one preamble sequence generation unit 101 is used for both the antenna Tx1 and the transmission antenna sequence of antenna Tx2, but as shown in FIG. 10, the sequence of antenna Tx1 is used. May be generated by the preamble sequence generator 101-1, and the preamble of the antenna Tx2 sequence may be generated by the preamble sequence generator 101-2. That is, an individual preamble sequence may be transmitted for each transmission antenna sequence.
- the receiving device may receive with one antenna or may receive with a plurality of antennas.
- the preamble sequences are arranged at random subcarrier intervals by changing the subcarrier pattern in which the preamble sequences are continuously arranged in the frequency direction. Can do. As a result, when the autocorrelation value of the preamble sequence is obtained in the time domain, the peak value of the side lobe is reduced, and as a result, timing detection errors can be prevented.
- FSTD as a diversity transmission method, a diversity effect can be obtained by one reception detection, so that efficient preamble transmission can be realized.
- a preamble sequence signal is arranged on a subcarrier having the same pattern as that of a PN sequence.
- a PN sequence in particular, a Gold sequence having the same length as the number of subcarriers and the same number of bits 1 and 0 is used, and the arrangement of subcarriers is made to correspond to the arrangement pattern of the Gold sequence, It is proposed to arrange a preamble sequence signal on a subcarrier corresponding to the position of either bit 1 or bit 0 of the Gold sequence.
- FIG. 11 shows an example of an arrangement pattern of preambles on subcarriers created using the Gold sequence.
- the preamble sequence is arranged on the subcarriers shown in black in FIGS. 11A, 11B, 11C, 11D, or 11E. And about the subcarrier transmitted from antenna Tx2, what is necessary is just to arrange
- Such an operation may be performed by generating a Gold sequence in the subcarrier selection instructing unit 102 in FIG. 8 and performing subcarrier selection based on it in the subcarrier selecting units 103-1 and 103-2.
- FIG. 12 shows the autocorrelation characteristics of the preamble on the receiving side when the subcarrier arrangement shown in FIG. 11A, FIG. 11B, FIG. 11C, FIG. 11D or FIG.
- FIG. 12 shows the autocorrelation characteristics of the preamble on the receiving side when the subcarrier arrangement shown in FIG. 11A, FIG. 11B, FIG. 11C, FIG. 11D or FIG.
- no large peak appears except for a large peak at the head position of the symbol. Therefore, timing detection errors can be prevented.
- an M sequence having the same length as the PN sequence, excluding the DC (direct current) subcarrier from the number of subcarriers, is used, and the subcarrier arrangement is made to correspond to the arrangement pattern of the M series.
- FIG. 13 shows an example of an arrangement pattern of preambles on subcarriers created using the M-sequence.
- the preamble sequence is arranged on the subcarriers shown in black in FIG. 13A or 13B. And about the subcarrier transmitted from antenna Tx2, what is necessary is just to arrange
- the M carrier is generated by the subcarrier selection instruction unit 102 of FIG. 8, and the subcarrier selection units 103-1 and 103-2 may perform subcarrier selection based thereon.
- FIG. 14 shows the autocorrelation characteristics of the preamble on the receiving side when the subcarrier arrangement shown in FIG. 13A or 13B is applied. As can be seen from FIG. 14, no large peak appears except for a large peak appearing at the head position of the symbol. Therefore, timing detection errors can be prevented.
- the central subcarrier is often not used because it is affected by the DC offset.
- the M sequence has a sequence length of 2n-1 (n: natural number), it easily matches OFDM subcarriers that do not use DC subcarriers.
- the M sequence has almost the same number of bits 0 and 1 (bit 0 is necessarily one less than bit 1), there is no need to select a sequence in which the same number of bits 1 and 0 occur as in the Gold sequence. This is suitable for arranging the same number of preambles on a subcarrier among a plurality of antennas.
- the reception side can determine the number of transmission antennas.
- FIG. 15 shows a preamble arrangement pattern on subcarriers when the number of transmission antennas is two, which is the same arrangement as described in FIG.
- FIG. 16 shows a preamble arrangement pattern on subcarriers when there is one transmission antenna.
- the preamble arrangement pattern of FIG. 16 is arranged on subcarriers in which the preamble is shifted by one subcarrier compared to the preamble arrangement pattern of FIG.
- the time waveform varies depending on the number of transmission antennas, so by preparing a plurality of replicas corresponding to the number of transmission antennas on the receiving side, The number of transmission antennas can be determined.
- the channel of each transmitting antenna can be estimated, and then used for channel compensation of a signal (for example, a random access signal) transmitted from the mobile terminal.
- a signal for example, a random access signal
- FIG. 17 shows an example of precoding weights used in PVS when there are two transmission antennas.
- weight 1 indicates that both signals are transmitted in the same phase
- weight 2 indicates that a signal from the second transmission antenna is transmitted in the opposite phase of the first transmission antenna.
- FIG. 18 shows a schematic diagram when PVS is applied in the frequency direction.
- the same preamble sequence is arranged for odd-numbered subcarriers and even-numbered subcarriers, in-phase weighting is performed on odd-numbered subcarriers, and reverse-phased weighting is performed on even-numbered subcarriers.
- the base station reception side
- the correlation calculation is performed using the replica created only by the odd subcarriers and the replica created only by the even subcarriers. Side lobes other than the position will occur.
- FIG. 19 shows an example of weight arrangement of the present embodiment in which side lobes are suppressed while PVS is applied.
- the pattern of weight arrangement is the same as that of the first embodiment, and weight 1 is applied to the subcarrier in which the preamble is arranged by the transmission antenna Tx1 of the first embodiment, and weight 2 is applied to the subcarrier in which the preamble is arranged by the transmission antenna Tx2. is doing.
- weight 1 is applied to the subcarrier in which the preamble is arranged by the transmission antenna Tx1 of the first embodiment
- weight 2 is applied to the subcarrier in which the preamble is arranged by the transmission antenna Tx2.
- the FSTDs of Embodiments 1 to 4 can be said to be an embodiment when PVS is applied in the frequency direction.
- [a1, a2] and [b1, a2] are used as the weights [Tx1, Tx2].
- [1, 1] and [1, ⁇ 1] has been described as one specific example.
- FSTD it is equivalent to using [1, 0], [0, 1] as weights.
- a preamble sequence signal is generated, the preamble sequence signal is weighted with a weighting vector using a plurality of antennas, and the weighted signal is distributed at random subcarrier intervals. It can be said that it is arranged.
- the subcarrier selection instruction unit 102 and the subcarrier selection units 103-1 and 103-2 also function as weighting means in addition to the function as subcarrier arrangement means. Can do.
- the first weighting unit performs the first weighting on the first preamble sequence signal or the second preamble sequence signal to generate the first weighted signal.
- a second weight for generating a second weighted signal by applying a second weight to the first preamble sequence or the second preamble sequence, and the first weighting is performed by an arrangement unit.
- the subsequent signal and the second weighted signal are arranged at random subcarrier intervals, and the first weighted signal and the second weighted signal are overlapped. It can be said that it is arranged so as not to. It can be said that FSTD is a case where a weight vector including a weight of 0 is used.
- the preamble transmission method described above may also be applied to the case of transmitting a preamble using more than two transmission antennas. it can.
- the subcarrier in which the preamble is arranged is divided into two by the PN sequence, and then the preamble arrangement after the two divisions Is multiplied by the PN sequence again to divide it into two, so that a four-part preamble arrangement, that is, a preamble arrangement for four transmission antennas can be created.
- side lobes can be prevented from appearing in the autocorrelation characteristics in the preamble time waveform transmitted from each transmission antenna.
- the transmission method of the present invention is not limited to this, and is applied to, for example, a case where a preamble sequence is transmitted from one antenna. Even in this case, the same effect as that of the above-described embodiment can be obtained.
- the preamble arrangement using the Gold sequence and the M sequence pattern according to the second, third, and fourth embodiments is particularly effective when the FSTD is used because the same number of preambles can be randomly arranged on both transmission antennas. .
- each functional block used in the description of each of the above embodiments is typically realized as an LSI which is an integrated circuit. These may be individually made into one chip, or may be made into one chip so as to include a part or all of them.
- the name used here is LSI, but it may also be called IC, system LSI, super LSI, or ultra LSI depending on the degree of integration.
- the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor.
- An FPGA Field Programmable Gate Array
- a reconfigurable processor that can reconfigure the connection and setting of circuit cells inside the LSI may be used.
- the present invention has an effect that the timing detection accuracy based on the preamble is improved, and is suitable for application to a mobile terminal, for example.
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Abstract
Description
3GPP TS 36.211 V8.0.0 (2007-09) "3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical channels and modulation (Release 8)", 5.7 Physical random access channel. 日本シミュレーション学会技術研究報告 JSST-MM2007-20, "Random access burst design and evaluation in Evolved-UTRA", DaichiIMAMURA, Katsuhiko HIRAMATSU, Tomohumi TAKATA, Takashi IWAI.
先ず、本発明の実施の形態を説明する前に、本発明に至った過程について説明する。
また、発明者らは、プリアンブルを配置するサブキャリアについて検討した。
図6に、本実施の形態における、OFDM信号のサブキャリアへのプリアンブルの配置パターンを示す。本実施の形態では、プリアンブル系列信号を連続して配置するサブキャリアのパターンを周波数方向で変化させるようになっている。具体的には、第1の送信アンテナTx1から送信する1,2,3,5,6,7,8,11,………,36,38,………番目のサブキャリアにプリアンブルを配置し、第2の送信アンテナTx2から送信する4,9,10,12,13,14,………,39,40,41,………番目のサブキャリアにプリアンブルを配置する。そして、図6のようにサブキャリアに配置されたプリアンブルは、同一時間にアンテナTx1及びアンテナTx2から送信される。
本実施の形態では、PN系列と同一パターンのサブキャリアにプリアンブル系列信号を配置することを提示する。本実施の形態では、PN系列として、特に、サブキャリア数と同じ長さでかつビット1とビット0が同数のGold系列を用い、当該Gold系列の配列パターンにサブキャリアの配列を対応させて、当該Gold系列のビット1又はビット0のいずれかの位置に対応するサブキャリアにプリアンブル系列信号を配置することを提案する。
本実施の形態では、PN系列として、特に、サブキャリア数からDC(直流)サブキャリアを除いた長さと同じ長さのM系列を用い、当該M系列の配列パターンにサブキャリアの配列を対応させて、当該M系列のビット0の位置に対応するサブキャリアにプリアンブル系列を配置することを提案する。
本実施の形態では、受信側で、送信アンテナの本数を判別し得る、プリアンブルの配置の仕方について説明する。
上述した実施の形態1~4では、本発明をFSTDに適用する場合について説明したが、本発明はプリアンブルを周波数方向にPVS(Precoding Vector Switching)した場合にも適用できる。この場合、周波数方向にプリコーディングベクトル処理を施す範囲を、実施の形態1~4のプリアンブル配置パターンを選択したのと同様に決定すればよい。
なお、上述した実施の形態では、送信アンテナが2本の場合で説明したが、上述したプリアンブルの送信方法は、2本よりも多い送信アンテナを用いてプリアンブルを送信する場合にも適用することができる。例えばプリアンブルを送信する送信アンテナが4本の場合は、先ず、上述した実施の形態で説明したように、プリアンブルを配置するサブキャリアをPN系列で2分割し、次に、2分割後のプリアンブル配置に再びPN系列を乗じて2分割すれば、4分割したプリアンブル配置、すなわち4本の送信アンテナ分のプリアンブル配置を作成することができる。これにより、各送信アンテナから送信されるプリアンブルの時間波形において、自己相関特性にサイドローブが出ないようにすることができる。
Claims (15)
- プリアンブル系列信号を生成するプリアンブル系列生成手段と、
複数のアンテナを用いて、前記プリアンブル系列信号を重み付けベクトルによって重み付けする重み付け手段と、
前記重み付けされた信号をランダムなサブキャリア間隔で配置する配置手段と、
を具備する無線送信装置。 - 前記重み付け手段は、第1のプリアンブル系列信号又は第2のプリアンブル系列信号に第1の重み付けを行って第1の重み付け後信号を生成する第1の重み付けと、前記第1のプリアンブル系列又は第2のプリアンブル系列に第2の重み付けを行って第2の重み付け後信号を生成する第2の重み付けとを行い、
前記配置手段は、前記第1の重み付け後の信号と前記第2の重み付け後の信号とをそれぞれランダムなサブキャリア間隔で配置し、かつ前記第1の重み付け後の信号と前記第2の重み付け後の信号が配置されるサブキャリアが重複しないように配置する、
請求項1に記載の無線送信装置。 - 前記重み付けベクトルは、重みが0のものを含む
請求項1に記載の無線送信装置。 - 前記配置手段は、前記プリアンブル系列信号を連続して配置するサブキャリアのパターンを周波数方向で変化させる、
請求項1に記載の無線送信装置。 - 前記配置手段は、PN系列と同一パターンのサブキャリアに前記プリアンブル系列信号を配置する、
請求項1に記載の無線送信装置。 - 前記配置手段は、前記PN系列として、サブキャリア数と同じ長さでかつビット1とビット0が同数のGold系列を用い、当該Gold系列の配列パターンにサブキャリアの配列を対応させて、当該Gold系列のビット1又はビット0の位置のいずれかに対応するサブキャリアに前記プリアンブル系列信号を配置する、
請求項5に記載の無線送信装置。 - 前記配置手段は、前記PN系列として、サブキャリア数からDCサブキャリアを除いた長さと同じ長さのM系列を用い、当該M系列の配列パターンにサブキャリアの配列を対応させて、当該M系列のビット0の位置に対応するサブキャリアに前記プリアンブル系列信号を配置する、
請求項5に記載の無線送信装置。 - 前記配置手段は、送信アンテナ数に応じて、前記プリアンブル系列信号を配置するサブキャリアを周波数方向にシフトさせる、
請求項1に記載の無線送信装置。 - プリアンブル系列信号を生成するプリアンブル系列生成ステップと、
複数のアンテナを用いて、前記プリアンブル系列信号を重み付けベクトルによって重み付けする重み付けステップと、
前記重み付けされた信号をランダムなサブキャリア間隔で配置する配置ステップと、
を含む無線送信方法。 - 前記重み付けステップでは、第1のプリアンブル系列信号又は第2のプリアンブル系列信号に第1の重み付けを行って第1の重み付け後信号を生成する第1の重み付けと、前記第1のプリアンブル系列又は第2のプリアンブル系列に第2の重み付けを行って第2の重み付け後信号を生成する第2の重み付けとを行い、
前記配置ステップでは、前記第1の重み付け後の信号と前記第2の重み付け後の信号とをそれぞれランダムなサブキャリア間隔で配置し、かつ前記第1の重み付け後の信号と前記第2の重み付け後の信号が配置されるサブキャリアが重複しないように配置する、
請求項9に記載の無線送信方法。 - 前記重み付けベクトルは、重みが0のものを含む
請求項9に記載の無線送信方法。 - 前記配置ステップでは、前記プリアンブル系列信号を連続して配置するサブキャリアのパターンを周波数方向で変化させる、
請求項9に記載の無線送信方法。 - 前記配置ステップでは、PN系列と同一パターンのサブキャリアに前記プリアンブル系列信号を配置する、
請求項9に記載の無線送信方法。 - 前記配置ステップでは、前記PN系列として、サブキャリア数と同じ長さでかつビット1とビット0が同数のGold系列を用い、当該Gold系列の配列パターンにサブキャリアの配列を対応させて、当該Gold系列のビット1又はビット0の位置のいずれかに対応するサブキャリアに前記プリアンブル系列信号を配置する、
請求項13に記載の無線送信方法。 - 前記配置ステップでは、前記PN系列として、サブキャリア数からDCサブキャリアを除いた長さと同じ長さのM系列を用い、当該M系列の配列パターンにサブキャリアの配列を対応させて、当該M系列のビット0の位置に対応するサブキャリアに前記プリアンブル系列信号を配置する、
請求項13に記載の無線送信方法。
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JP2013500645A (ja) * | 2009-07-29 | 2013-01-07 | ゼットティーイー コーポレイション | 直交周波数分割多重方式におけるランダムアクセス信号の検出方法及び装置 |
JP5339636B2 (ja) * | 2008-08-05 | 2013-11-13 | パナソニック株式会社 | 無線通信装置及び無線通信方法 |
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CN103477583B (zh) | 2011-04-19 | 2016-11-09 | 太阳专利托管公司 | 预编码方法、预编码装置 |
CN104753842B (zh) * | 2015-04-18 | 2017-10-13 | 中国电子科技集团公司第四十一研究所 | 基于峰值位置判别的信号调制方式识别方法 |
ES2749918T3 (es) * | 2015-09-28 | 2020-03-24 | Ericsson Telefon Ab L M | Preámbulo de acceso aleatorio para minimizar el retroceso de PA |
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