WO2011013343A1 - 無線通信装置及び信号検出方法 - Google Patents
無線通信装置及び信号検出方法 Download PDFInfo
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- WO2011013343A1 WO2011013343A1 PCT/JP2010/004745 JP2010004745W WO2011013343A1 WO 2011013343 A1 WO2011013343 A1 WO 2011013343A1 JP 2010004745 W JP2010004745 W JP 2010004745W WO 2011013343 A1 WO2011013343 A1 WO 2011013343A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0204—Channel estimation of multiple channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/7103—Interference-related aspects the interference being multiple access interference
- H04B1/7107—Subtractive interference cancellation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/711—Interference-related aspects the interference being multi-path interference
- H04B1/7113—Determination of path profile
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/318—Received signal strength
- H04B17/327—Received signal code power [RSCP]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/345—Interference values
Definitions
- the present invention relates to a radio communication apparatus and a signal detection method, and more particularly to a radio communication apparatus and a signal detection method provided with an interference canceller that removes interference components of an interference cell from a received signal.
- CDMA high-speed communication systems such as HSDPA (High Speed Downlink Packet Access) are known.
- HSDPA High Speed Downlink Packet Access
- the CDMA receiver communicates in the vicinity of the base station, the communication quality is good and communication at a high rate is possible.
- the CDMA receiver communicates at a cell edge far from the base station, interference from adjacent cells is large, and the communicable rate can be kept low.
- an interference canceller that removes a signal of another cell serving as an interference cell is used to improve reception performance (for example, Patent Document 1 and Patent Document 2).
- Patent Document 1 and Patent Document 2 In order to remove the signal of the interference cell using the interference canceller, it is necessary to perform channel estimation of the interference cell and accurately obtain the reception power and thermal noise power of the interference cell.
- Patent Document 3 there is known a method for estimating the received power of another cell serving as an interference cell by estimating all spreading codes used in the other cell (for example, Patent Document 3).
- Patent Document 1 and Patent Document 2 the thermal noise power including both the received power and the thermal noise power of the interference cell is estimated, and the thermal noise power cannot be calculated correctly, thereby reducing the performance of the interference canceller. There is a problem. Further, in Patent Document 3, since the received power of the interference cell can be estimated, the received power of the interference cell determined by the method of Patent Document 3 is removed from the thermal noise power determined by the methods of Patent Document 1 and Patent Document 2. Thus, the thermal noise power can be obtained with high accuracy. However, since Patent Document 3 requires a large number of despreaders, there is a problem that the circuit scale increases and the power consumption increases.
- An object of the present invention is to provide a radio communication apparatus and a signal detection method capable of improving the characteristics of an interference canceller and improving the reception performance without increasing the circuit scale and without increasing the power consumption. Is to provide.
- the radio communication apparatus of the present invention includes channel estimation means for obtaining a channel estimation value of each path and a variance value of the channel estimation value for each cell from a received signal subjected to multipath fading, and power of the channel estimation value of each path.
- Power sum calculating means for calculating the power sum for each cell, received power calculating means for calculating the received power of the received signal, based on the channel estimation value, the variance value, the power sum, and the received power.
- Exponential calculation means for calculating a received power index of an interference cell based on the channel estimation value, the variance value, and the received power, and calculating the thermal noise power index, and receiving the thermal noise power index and the interference cell By filtering the received signal with the filter coefficient obtained from the power index, the interference component of the interference cell contained in the received signal is removed. It adopts a configuration comprising a canceling means.
- the signal detection method of the present invention is a signal detection method in a wireless communication apparatus that detects a signal of a desired cell by removing interference components of an interference cell from a received signal, and is a signal detection method for each path from a received signal subjected to multipath fading.
- Irutaringu Obtaining a channel estimation value and a variance value of the channel estimation value for each cell; calculating a power sum for each cell of the power of the channel estimation value of each path; and calculating a reception power of the received signal And calculating a thermal noise power index based on the channel estimation value, the variance value, the power sum, and the received power, and based on the channel estimate value, the variance value, and the received power, the interference cell Calculating the received power index of the received signal with a filter coefficient obtained from the thermal noise power index and the received power index of the interfering cell.
- Irutaringu was as comprising the steps of: detecting the removed signal interference components of the interfering cells are included in the reception signal.
- the characteristics of the interference canceller can be improved and the reception performance can be improved without increasing the circuit scale and increasing the power consumption.
- 1 is a block diagram showing a configuration of a wireless communication apparatus according to Embodiment 1 of the present invention.
- the block diagram which shows the structure of the demodulation part which concerns on Embodiment 1 of this invention.
- Spectrum conceptual diagram after CDMA despreading processing according to Embodiment 1 of the present invention The block diagram which shows the structure of the demodulation part which concerns on Embodiment 2 of this invention.
- FIG. 1 is a diagram showing a configuration of a communication system according to Embodiment 1 of the present invention.
- the communication system includes a plurality of interfering stations 20-1 to 20-j (j is an arbitrary natural number indicating the number of interfering stations), a desired station 30, and a radio such as a mobile phone.
- the communication apparatus 100 is mainly configured.
- interfering stations 20-1 to 20-j constitute adjacent cells of the desired station 30.
- the wireless communication device 100 communicates with the desired station 30 within the cell of the desired station 30.
- radio communication apparatus 100 receives a signal from desired station 30 and also receives signals from interfering stations 20-1 to 20-j.
- the radio communication apparatus 100 can accurately detect the signal of the desired station 30 by accurately removing the interference components from the interference stations 20-1 to 20-j included in the received signal from the received signal. .
- FIG. 2 is a block diagram illustrating a configuration of the wireless communication apparatus 100.
- the wireless communication device 100 is, for example, a CDMA receiver.
- the wireless communication apparatus 100 mainly includes an antenna 101, a wireless unit 102, an analog / digital (hereinafter referred to as “A / D”) conversion unit 103, a demodulation unit 104, and a decoding unit 105. Each configuration will be described in detail below.
- a / D analog / digital
- the antenna 101 receives the CDMA signal transmitted from the desired station and the interference station and outputs it to the radio unit 102.
- the radio unit 102 performs a filtering process using a low-pass filter or a band-pass filter on the CDMA signal input from the antenna 101. Radio section 102 then outputs the filtered CDMA signal to A / D conversion section 103.
- the A / D conversion unit 103 converts the CDMA signal that is an analog signal input from the wireless unit 102 into a digital signal and outputs the digital signal to the demodulation unit 104.
- the demodulator 104 demodulates the digital signal input from the A / D converter 103 and outputs the demodulated signal to the decoder 105. At this time, the demodulator 104 performs processing to remove the interference component of the interference cell from the received signal. Details of the configuration of the demodulator 104 will be described later.
- the decoding unit 105 decodes the demodulated signal input from the demodulation unit 104 and outputs the decoding result as data.
- FIG. 3 is a block diagram illustrating a configuration of the demodulation unit 104.
- Demodulation section 104 is mainly composed of channel estimation section 301, maximum power channel estimation selection section 302, channel power calculation section 303, received signal power calculation section 304, exponent calculation section 305, and interference cancellation section 306. Is done. Each configuration will be described in detail below.
- the channel estimation unit 301 uses the digital signal input from the A / D conversion unit 103 to calculate the channel estimation value and the channel estimation value of a desired cell (desired station) and an interference cell (interference station) for each path constituting multipath fading. The variance value of is calculated. Then, the channel estimation unit 301 outputs the calculated channel estimation value of each path to the maximum power channel estimation selection unit 302, the channel power calculation unit 303, and the interference cancellation unit 306, and distributes the calculated channel estimation value of each path. The value is output to maximum power channel estimation selection section 302.
- the maximum power channel estimation selection unit 302 calculates the channel estimation value of the path having the maximum power and the variance value of the channel estimation value from the channel estimation value of each path and the variance value of the channel estimation value input from the channel estimation unit 301. Select for each cell. Maximum power channel estimation selection section 302 then outputs the channel estimation value of each selected path and the variance value of the channel estimation value to exponent calculation section 305.
- the channel power calculation unit 303 obtains the power value of each path from the channel estimation value of each path input from the channel estimation unit 301, and adds the obtained power value of each path for each cell to thereby estimate the channel of each cell. Calculate the power sum of the values. Channel power calculation section 303 then outputs the calculated value of the total power to exponent calculation section 305.
- the reception signal power calculation unit 304 calculates the reception power of the digital signal input from the A / D conversion unit 103. Received signal power calculation section 304 then outputs the calculated received power value to exponent calculation section 305.
- Exponent calculation section 305 includes a channel estimation value and a variance value of the path having the maximum power input from maximum power channel estimation selection section 302, a calculated value of the total power input from channel power calculation section 303, and a received signal power calculation section.
- a thermal noise power index is calculated based on the received power calculation value input from 304.
- exponent calculation section 305 is based on the channel estimation value and variance value of the path having the maximum power input from maximum power channel estimation selection section 302 and the received power calculation value input from reception signal power calculation section 304.
- the reception power index of the interference cell is calculated. That is, the index calculation unit 305 calculates the thermal noise power index and the received power index of the interference cell individually. Then, exponent calculation section 305 outputs the calculated thermal noise power index and the received power index of the interference cell to interference cancellation section 306. A method for obtaining the thermal noise figure and the received power figure of the interference cell will be described later.
- the interference cancellation unit 306 is an A / D conversion unit 103. A filtering process is performed on the digital signal input from the above to restore orthogonality by multipath and to remove the interference component of the interference cell. Then, the interference cancellation unit 306 outputs the digital signal from which the interference component is removed to the decoding unit 105 as a demodulated signal.
- FIG. 4 is a flowchart showing the operation of the demodulation unit 104.
- channel estimation section 301 performs despreading processing for each individual path that constitutes multipath fading and can be separated from each other, from the digital signal input from A / D conversion section 103 (step ST401). At this time, the channel estimation unit 301 may despread only a specific channel such as a pilot channel for both the desired cell and the interference cell.
- channel estimation section 301 calculates a channel estimation value for each path and a variance value of the channel estimation value from the despread signal (step ST402). Further, the processing of step ST401 and step ST402 is performed for each path constituting the multipath.
- the maximum power channel estimation selection unit 302 calculates the power value of the channel estimation value for each path, and selects the channel estimation value of the maximum power path and the variance value of the channel estimation value among the calculated power values. (Step ST403).
- channel power calculation section 303 calculates the channel power by squaring the channel estimation value for each path and calculating the sum of the squared channel estimation values (step ST404). Further, the processing of step ST403 and step ST404 is performed for each cell.
- Received signal power calculation section 304 calculates the received power of the received signal by squaring the digital signal input from A / D conversion section 103 and averaging the product of the constant section product sum (step ST405). ).
- the exponent calculation unit 305 uses the channel estimated value of the maximum power path for each cell and the variance value of the channel estimated value, the total power for each cell, and the received power of the received signal to calculate the thermal noise power index.
- ⁇ is calculated.
- the index calculation unit 305 calculates the thermal noise power index ⁇ using the following equation (1) (step ST406). It will be described later that the thermal noise power index ⁇ can be calculated by the equation (1).
- exponent calculation section 305 calculates reception power index ⁇ j of the interference cell using the channel estimation value of the maximum power path for each cell, the variance value of the channel estimation value, and the reception power of the received signal. . Specifically, exponent calculation section 305 calculates the received power index ⁇ j of the interference cell using the following equation (2) (step ST407). It will be described later that the reception power index ⁇ j of the interference cell can be calculated by the equation (2).
- the interference cancellation unit 306 uses the channel estimation value for each cell, the thermal noise figure, and the received power figure of the interfering cell to restore orthogonality due to multipath and to remove interference from the interfering cell.
- a correct FIR filter coefficient is calculated (step ST408).
- the interference cancellation unit 306 constructs a matrix as shown in the following equation (3).
- the interference cancellation unit 306 calculates the filter coefficient W by the following equation (4).
- the interference cancellation unit 306 performs FIR filtering on the digital signal input from the A / D conversion unit 103 using the calculated filter coefficient (step ST409).
- interference cancellation section 306 performs despreading processing on the FIR filtered signal (step ST410). At this time, the interference cancellation unit 306 does not perform the despreading process on the interference cell.
- the interference cancellation unit 306 outputs the signal after the despreading process to the decoding unit 105 as a demodulated signal. This is the end of the description of the operation of the demodulation unit 104.
- FIG. 5 is a conceptual diagram of the spectrum after the CDMA despreading process.
- equation (5) which is a model equation of the received signal r (n) at time n considering the interference cell, is set.
- equation (6) which is a model equation for the received power of the received signal, is obtained.
- a dispersion model formula of a channel estimation value considering an interference cell is set.
- the dispersion of channel estimation values includes interference # 501 from other paths of the desired cell.
- Interference # 502 from the interference cell and thermal noise component # 503 are included.
- the dispersion model expression of this channel estimation value is as shown in the following expression (7).
- the dispersion model formula of the channel estimation value when the despreading process and the channel estimation are performed is set for the number of interfering cells (J).
- Equation (6) and (J + 1) Equations (7) the unknown is (J + 2) of the received power from the desired cell, the received power from the interference cell, and the thermal noise power.
- the thermal noise power and the received power of the interference cell can be calculated.
- the thermal noise power index ⁇ can be calculated by the equation (1)
- the received power index ⁇ j of the interference cell can be calculated by the equation (2).
- reception is performed by one antenna.
- the present embodiment is not limited to this, and reception may be performed by a plurality of antennas.
- the thermal noise power index and the received power index of the interference cell can be calculated for each antenna. Further, by averaging the thermal noise power index calculated for each antenna and the received power index of the interference cell between the antennas, the thermal noise power index and the received power index of the interference cell can be calculated with higher accuracy.
- FIG. 6 is a block diagram showing a configuration of demodulation section 600 according to Embodiment 2 of the present invention.
- FIG. 6 adds an interference target cell number determination unit 601 to the demodulation unit 104 according to Embodiment 1 shown in FIG. 3 and has an exponent calculation unit 602 instead of the exponent calculation unit 305.
- an interference canceling unit 603 is provided instead of the interference canceling unit 306. 6 parts having the same configuration as in FIG. 3 are denoted by the same reference numerals and description thereof is omitted.
- the configuration of the communication system is the same as FIG 1, configuration of a radio communication apparatus, since except having a demodulator 600 instead of the demodulator 104 is the same as FIG. 2, the Description is omitted.
- the channel estimation unit 301 uses the digital signal input from the A / D conversion unit 103 to calculate the channel estimation value and the channel estimation value of a desired cell (desired station) and an interference cell (interference station) for each path constituting multipath fading. The variance value of is calculated. Then, the channel estimation unit 301 outputs the calculated channel estimation value of each path to the maximum power channel estimation selection unit 302, the channel power calculation unit 303, and the interference cancellation unit 603, and distributes the calculated channel estimation value of each path. The value is output to maximum power channel estimation selection section 302.
- the maximum power channel estimation selection unit 302 calculates the channel estimation value of the path having the maximum power and the variance value of the channel estimation value from the channel estimation value of each path and the variance value of the channel estimation value input from the channel estimation unit 301. Select for each cell. Maximum power channel estimation selection section 302 then outputs the channel estimation value of each selected path and the variance value of the channel estimation value to exponent calculation section 602.
- the reception signal power calculation unit 304 calculates the reception power of the reception signal input from the A / D conversion unit 103. Received signal power calculation section 304 then outputs the calculated received power value to exponent calculation section 602.
- the channel power calculation unit 303 obtains the power value of each path from the channel estimation value of each path input from the channel estimation unit 301, and adds the obtained power value of each path for each cell to thereby estimate the channel of each cell. Calculate the power sum of the values. Channel power calculation section 303 then outputs the calculated value of the total power to interference target cell number determination section 601.
- the interference target cell number determination unit 601 outputs the input power sum to the exponent calculation unit 602 when the calculated value of the power sum input from the channel power calculation unit 303 is larger than the threshold value. Also, the interference target cell number determination unit 601 does not output the input power sum to the exponent calculation unit 602 when the calculated value of the power sum input from the channel power calculation unit 303 is equal to or less than the threshold value. Further, the interference target cell number determination unit 601 counts cells having a calculated power sum larger than the threshold as interference target cells. Then, the interference target cell number determination unit 601 outputs the count value as the interference target cell number to the exponent calculation unit 602 and the interference cancellation unit 603.
- Exponent calculation section 602 receives the channel estimation value and dispersion value of the path having the maximum power input from maximum power channel estimation selection section 302, the calculated power sum input from interference target cell number determination section 601, and the received signal power Based on the calculated received power value input from the calculation unit 304, the thermal noise power index and the received power index of the interference cell are calculated. At this time, the index calculation unit 602 calculates the thermal noise power index and the received power index of the interference cell based on the number of cells to be interfered input from the interference target cell number determination unit 601 by calculation excluding cells other than the interference target cell. Is calculated. Then, exponent calculation section 602 outputs the calculated thermal noise power index and the received power index of the interference cell to interference cancellation section 603.
- the interference cancellation unit 603 Based on the channel estimation value of each cell input from the channel estimation unit 301, the thermal noise power index input from the index calculation unit 602, and the received power index of the interference cell, the interference cancellation unit 603 A filtering process is performed on the digital signal input from the above to restore orthogonality by multipath and to remove the interference component of the interference cell. At this time, the interference cancellation unit 603 does not remove the interference of cells other than the interference target cell based on the number of interference target cells input from the interference target cell number determination unit 601. Then, the interference cancellation unit 603 outputs the digital signal from which the interference component is removed to the decoding unit 105 as a demodulated signal.
- signals may be received by a plurality of antennas.
- the power consumption can be further reduced.
- the radio communication apparatus and signal detection method according to the present invention are particularly suitable for removing the interference component of the interference cell from the received signal by the interference canceller.
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Abstract
Description
図1は、本発明の実施の形態1に係る通信システムの構成を示す図である。
図6は、本発明の実施の形態2に係る復調部600の構成を示すブロック図である。
Claims (7)
- マルチパスフェージングを受けた受信信号より各パスのチャネル推定値及び前記チャネル推定値の分散値をセル毎に求めるチャネル推定手段と、
各パスの前記チャネル推定値の電力のセル毎の電力総和を算出する電力総和算出手段と、
前記受信信号の受信電力を算出する受信電力算出手段と、
前記チャネル推定値と前記分散値と前記電力総和と前記受信電力とに基づいて熱雑音電力指数を算出するとともに、前記チャネル推定値と前記分散値と前記受信電力とに基づいて干渉セルの受信電力指数を算出する指数算出手段と、
前記熱雑音電力指数及び前記干渉セルの受信電力指数により求めたフィルタ係数で前記受信信号をフィルタリングすることにより、前記受信信号に含まれる干渉セルの干渉成分を除去する干渉キャンセル手段と、
を具備する無線通信装置。 - 前記指数算出手段は、前記電力総和が閾値以上のセルの前記干渉セルの受信電力指数を算出する請求項1記載の無線通信装置。
- 複数のアンテナにより前記受信信号を受信する受信手段をさらに具備し、
前記指数算出手段は、前記アンテナ毎に前記熱雑音電力指数を算出する請求項1記載の無線通信装置。 - 複数のアンテナにより前記受信信号を受信する受信手段をさらに具備し、
前記指数算出手段は、前記アンテナ毎に前記干渉セルの受信電力指数を算出する請求項1記載の無線通信装置。 - 受信信号より干渉セルの干渉成分を除去して所望セルの信号を検出する無線通信装置における信号検出方法であって、
マルチパスフェージングを受けた受信信号より各パスのチャネル推定値及び前記チャネル推定値の分散値をセル毎に求めるステップと、
各パスの前記チャネル推定値の電力のセル毎の電力総和を算出するステップと、
前記受信信号の受信電力を算出するステップと、
前記チャネル推定値と前記分散値と前記電力総和と前記受信電力とに基づいて熱雑音電力指数を算出するとともに、前記チャネル推定値と前記分散値と前記受信電力とに基づいて前記干渉セルの受信電力指数を算出するステップと、
前記熱雑音電力指数及び前記干渉セルの受信電力指数により求めたフィルタ係数で前記受信信号をフィルタリングすることにより、前記受信信号に含まれる干渉セルの干渉成分を除去した信号を検出するステップと、
を具備する信号検出方法。
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JP2016508304A (ja) * | 2012-12-11 | 2016-03-17 | エルジー エレクトロニクス インコーポレイティド | 無線通信システムで信号を送受信する方法及びこのための装置 |
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- 2010-07-26 WO PCT/JP2010/004745 patent/WO2011013343A1/ja active Application Filing
- 2010-07-26 US US13/387,074 patent/US20120122415A1/en not_active Abandoned
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JP2014511638A (ja) * | 2011-03-01 | 2014-05-15 | クゥアルコム・インコーポレイテッド | 基準信号干渉除去のためのチャネル推定 |
JP2016508304A (ja) * | 2012-12-11 | 2016-03-17 | エルジー エレクトロニクス インコーポレイティド | 無線通信システムで信号を送受信する方法及びこのための装置 |
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JPWO2011013343A1 (ja) | 2013-01-07 |
US20120122415A1 (en) | 2012-05-17 |
CN102474360A (zh) | 2012-05-23 |
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