WO2013171823A1 - 受信装置および受信方法 - Google Patents
受信装置および受信方法 Download PDFInfo
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- WO2013171823A1 WO2013171823A1 PCT/JP2012/062305 JP2012062305W WO2013171823A1 WO 2013171823 A1 WO2013171823 A1 WO 2013171823A1 JP 2012062305 W JP2012062305 W JP 2012062305W WO 2013171823 A1 WO2013171823 A1 WO 2013171823A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2649—Demodulators
- H04L27/26524—Fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators in combination with other circuits for demodulation
- H04L27/26526—Fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators in combination with other circuits for demodulation with inverse FFT [IFFT] or inverse DFT [IDFT] demodulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] receiver or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]
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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
- 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
- H04L25/06—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection
- H04L25/067—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection providing soft decisions, i.e. decisions together with an estimate of reliability
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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
- H04L25/08—Modifications for reducing interference; Modifications for reducing effects due to line faults ; Receiver end arrangements for detecting or overcoming line faults
- H04L25/085—Arrangements for reducing interference in line transmission systems, e.g. by differential transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/01—Equalisers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
- H04L27/2634—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation
- H04L27/2636—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
Definitions
- the present invention relates to a receiving apparatus and a receiving method.
- transmission path frequency selectivity and time variation occur due to multipath fading caused by reflection of a transmission signal on a building or the like, and Doppler fluctuation caused by movement of a terminal.
- the received signal is a signal in which a transmission symbol interferes with a symbol that arrives after a delay time.
- a single carrier block transmission method has recently attracted attention in order to obtain the best reception characteristics (for example, see Non-Patent Document 1 below).
- the single carrier (SC) block transmission system has lower peak power than the OFDM (Orthogonal Frequency Division Multiplexing) transmission system (for example, see Non-Patent Document 2 below), which is a multiple carrier (MC) block transmission. can do.
- OFDM Orthogonal Frequency Division Multiplexing
- a transmitter that performs SC block transmission for example, the following transmission is performed to take measures against multifading.
- PSK Phase Shift Keying
- QAM Quadrature Amplitude Modulation
- the digital modulation signal is converted into a time domain signal by a precoder and IDFT (Inverse Discrete Fourier Transform) processing unit. Convert.
- a PSK or QAM signal is generated by an error correction code and a bit sequence generated by using an interleaver that arranges the bit sequence in a discontinuous form in terms of time, frequency, and the like.
- Error correction codes include commonly used convolutional codes, turbo codes, LDPC (Low Density Parity Check) codes, and the like. Thereafter, as a countermeasure against multipath fading, a CP is inserted in a CP (Cyclic Prefix) insertion unit.
- the CP insertion unit copies a predetermined number of samples after the time domain signal and adds them to the beginning of the transmission signal.
- ZP zero padding
- a transmitter that performs SC transmission generally performs DFT (Discrete Fourier Transform) processing by a precoder.
- DFT Discrete Fourier Transform
- a precoder using a unitary matrix for example, see Non-Patent Document 3 below.
- the transmission peak power is suppressed while reducing the influence of multipath fading.
- the decoding result may be deteriorated in an environment where the transmission path fluctuation is significant.
- the present invention has been made in view of the above, and an object of the present invention is to obtain a receiving apparatus capable of improving decoding characteristics.
- the present invention performs transmission path estimation using a received signal and obtains a transmission path estimated value, the transmission path estimated value, and the received signal
- a demodulation processing unit that performs a demodulation process using the transmission path
- a weight calculation unit that calculates a decoding weight for each transmission path using the transmission path estimation value
- a decoding process using the weight and the result of the demodulation process
- a decoding unit for performing the above.
- the receiving apparatus and receiving method according to the present invention have the effect of improving the decoding characteristics.
- FIG. 1 is a diagram illustrating a functional configuration example of the receiving apparatus according to the first embodiment.
- FIG. 2 is a flowchart illustrating an example of a reception processing procedure according to the first embodiment.
- FIG. 3 is a diagram illustrating a functional configuration example of the receiving apparatus according to the second embodiment.
- FIG. 4 is a diagram illustrating a functional configuration example of a transmission apparatus that transmits an SC block signal.
- FIG. 5 shows an example of pilot and data symbol arrangement.
- FIG. 6 is a diagram illustrating the concept of interpolation of the transmission path estimation value of the carrier of the data symbol.
- FIG. 7 is a diagram illustrating an example of a relationship between a transmission path estimation value and power.
- FIG. 1 is a diagram illustrating a functional configuration example of the receiving apparatus according to the first embodiment.
- FIG. 2 is a flowchart illustrating an example of a reception processing procedure according to the first embodiment.
- FIG. 3 is a diagram illustrating a functional configuration example of the receiving apparatus according to
- FIG. 8 is a diagram illustrating an example of the relationship between the weight and the power for each transmission path when the weight is calculated based on the power.
- FIG. 9 is a diagram illustrating an example of a weight calculation method according to the third embodiment.
- FIG. 10 is a flowchart illustrating an example of a reception processing procedure according to the fourth embodiment.
- FIG. 1 is a diagram illustrating a functional configuration example of a first embodiment of a receiving device according to the present invention.
- the receiving apparatus of the present embodiment includes a receiving antenna 1, a reception processing unit 2, a storage unit 3-1, 3-2, 3-3, a transmission path estimation unit 4, a demodulation processing unit 5, A weight calculation unit 6, a control unit 7, and a decoding unit 8 are provided.
- the reception signal received from the reception antenna 1 is input to the reception processing unit 2.
- the reception signal is subjected to predetermined reception processing by the reception processing unit 2 and then stored in the storage unit 3-1 (reception signal storage unit).
- the received signal accumulated in the storage unit 3-1 is input to the transmission path estimation unit 4 and the demodulation processing unit 5 by a control signal from the control unit 7.
- the transmission path estimation unit 4 performs transmission path estimation using the input received signal, and inputs the transmission path estimation value to the demodulation processing unit 5 and the weight calculation unit 6.
- the demodulation processing unit 5 performs demodulation processing using the input received signal and transmission path estimation value, and the demodulated signal is stored in the storage unit 3-2 (demodulation signal storage unit).
- the weight calculator 6 calculates a weight (decoding weight) using the input transmission path estimation value.
- the weight is accumulated in the storage unit 3-3 (weight storage unit).
- the decoding unit 8 performs a decoding process based on the demodulated signal stored in the storage unit 3-2 and the weight stored in the storage unit 3-3. When an interleaver is used on the transmission side in the decoding process, a deinterleaver is used to return the bit arrangement to the original position.
- the transmission path estimation unit 4 performs transmission path estimation using the received signal output from the storage unit 3-1.
- a known signal hereinafter referred to as a pilot signal
- the transmission path estimation unit 4 extracts the received signal including the pilot signal and performs transmission path estimation.
- any method may be used as the transmission path estimation method, and a method that does not use a pilot signal may be used.
- the demodulation processing unit 5 performs demodulation using the transmission path estimation value and the received signal. In the present embodiment, any method may be used for the demodulation process.
- the decoding unit 8 performs decoding using, for example, an LLR (Log Likelihood Ratio) at the time of decoding.
- the LLR for each bit can be calculated using the following equation (1). For example, when x is a value of +1 or ⁇ 1, the LLR is a value obtained by taking the logarithm (log) of the ratio between the probability of x being +1 and the probability of being ⁇ 1.
- the LLR for each random number is defined as in the following equation (2). i is an integer satisfying 0 ⁇ i ⁇ 2.
- the weighted LLR is expressed by the following expression (3) in the case of the above expression (2).
- weighted LLR values can be generated.
- the weight is calculated based on the transmission path estimation value so as to have a high value at a time and frequency with high reliability. Therefore, the higher the weight, the higher the reliability of the LLR value.
- the random number is described.
- x i is a received signal corresponding to time i (in this case, i is not limited to 0 ⁇ i ⁇ 2), and a weight for the received signal is used as a weight to generate a transmission path estimation value.
- reliability is given by the magnitude of the weight, so that the reliability of the LLR value is increased and the decoding characteristic is improved.
- the weight generation method may be any generation method as long as the method is generated based on the channel estimation value.
- the weight generation method By generating the weight based on the transmission path estimation value, it is possible to create a weight that varies with time i in a transmission path with a significant time fluctuation. Further, a normalized value may be used as the weight.
- the storage units 3-1 to 3-3 are used to store received signals, demodulated signals, and weights, respectively.
- the capacity that can be stored may differ depending on the amount of data to be stored, and the data output from the storage units 3-1 to 3-3 and the recording timing to the storage units 3-1 to 3-3 are limited by the control unit 7. Is done.
- the control unit 7 controls the storage unit 3-1 using the control signal so that the received signal can be stored while the transmission path estimation unit 4, the weight calculation unit 6, and the demodulation processing unit 5 are operating. To do.
- the control unit 7 controls to output the weight and the transmission path estimation value by the control signal, respectively.
- the storage units 3-1 to 3-3 also have a function of feeding back to the control unit 7 how much data amount has been stored or read.
- the capacity of the storage units 3-2 and 3-3 is, for example, greater than or equal to the capacity capable of storing data that can be decoded by the decoding unit 8.
- the storage unit 3-1 only needs to have a capacity capable of storing the reception signal output from the reception processing unit 2 during the transmission path estimation, demodulation processing, and weight calculation processing.
- FIG. 2 is a flowchart showing an example of a reception processing procedure according to the present embodiment.
- each unit of the receiving apparatus performs initial setting (step S1), and the reception processing unit 2 performs reception processing (reception signal processing) on the reception signal (step S2).
- reception processing reception signal processing
- the control unit 7 returns to step S2.
- step S3 When a predetermined amount of received signal is stored in the storage unit 3-1 (step S3, Yes), the control unit 7 instructs the storage unit 3-1 to output the received signal, and the transmission path estimation unit 4 estimates the transmission path. Is implemented (step S4). Then, demodulation processing (step S5) by the demodulation processing unit 5 and weight calculation (step S6) by the weight calculation unit 6 are performed in parallel. The control unit 7 determines whether or not a predetermined amount of demodulated signal is stored in the storage unit 3-2 (step S7). If the predetermined amount of demodulated signal is stored (step S7 Yes), the storage unit 3- 2 is controlled to output a demodulated signal, and the process proceeds to step S9.
- control unit 7 determines whether or not the specified amount of weight is stored in the storage unit 3-3 (step S8). If the specified amount of weight is stored (Yes in step S8), the storage unit 3- 3 is controlled to output a weight, and the process proceeds to step S9. If a predetermined amount of demodulated signal is not stored in step S7 (No in step S7), the process returns to step S5. If the specified amount of weight is not stored in step S8 (No in step S8), the process returns to step S6.
- step S9 the decoding unit 8 performs a decoding process using the input demodulated signal and weight (step S9), and outputs a decoded bit as a decoding result (step S10).
- control unit 7 inputs a predetermined amount of weight and a demodulated signal (for example, a weight and demodulated signal for a predetermined number of SC symbols) to the decoding unit 8, and the decoding unit 8 Decoding can be performed using the demodulated signal.
- a demodulated signal for example, a weight and demodulated signal for a predetermined number of SC symbols
- the weight is calculated based on the channel estimation value, and the decoding process is performed using the LLR value multiplied by the weight at the time of decoding. For this reason, weighting can be performed in accordance with the state of the transmission line even in a transmission line with significant time fluctuation, and decoding characteristics can be improved.
- FIG. FIG. 3 is a diagram illustrating a functional configuration example of the second embodiment of the receiving device according to the present invention.
- a receiving apparatus that receives a signal (SC block signal) generated by an SC block transmission method will be described.
- the receiving apparatus of the present embodiment includes a receiving antenna 1, a CP removing unit 21, a DFT unit 22, storage units 3-1 to 3-3, a transmission path estimation unit 4, an equalization processing unit 51, A signal processing unit 52, a demodulation unit 55, a power calculation unit 61, a weight processing unit 62, a control unit 7, and a decoding unit 8 are provided.
- the signal processing unit 52 includes a zero processing unit 521, a roll-off processing unit 522, and an IDFT unit 523. Components having the same functions as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and redundant description is omitted.
- FIG. 4 is a diagram illustrating a functional configuration example of a transmission apparatus that transmits an SC block signal.
- This transmission apparatus includes a precoder 101 that performs precoding processing such as DFT on information symbols, a pilot symbol generation unit 102 that generates pilot symbols, and a multiplexing unit that multiplexes pilot symbols and information symbols after precoding processing. 103. Further, this transmission apparatus includes an IDFT unit 104 that converts the multiplexed signal into a time domain signal by IDFT processing, and a CP insertion unit 105 that inserts a CP into the time domain signal.
- FIG. 4 shows an example of the position of the pilot symbol in the signal input to the IDFT unit 104, but the position of the pilot symbol is not limited to this. Note that the transmission apparatus that transmits the SC block signal received by the reception apparatus of the present embodiment is not limited to the example of FIG.
- the signal received from the receiving antenna 1 is subjected to CP removal by the CP removal unit 21 and DFT processing by the DFT unit 22, and is stored in the storage unit 3-1.
- the received signal is output under the control of the control unit 7, and the transmission channel estimation unit 4 performs transmission channel estimation.
- the transmission path estimation unit 4 inputs the transmission path estimation value to the equalization processing unit 51 and the power calculation unit 61.
- the equalization processing unit 51 performs frequency domain equalization processing using the input transmission path estimation value, and inputs the processed signal to the zero processing unit 521.
- the zero processing unit 521 removes the zero carrier (unused frequency band) from the input signal, and inputs the signal after the zero carrier removal to the roll-off processing unit 522.
- the roll-off processing unit 522 performs roll-off filter processing on the input signal, and inputs the processed signal to the IDFT unit 523.
- the IDFT unit 523 performs IDFT processing on the input signal, and inputs the processed signal to the demodulation unit 55.
- the demodulator 55 performs demodulation processing using the input signal, and stores the demodulated signal in the storage unit 3-2.
- the power calculator 61 calculates the power of each carrier in the frequency domain based on the input transmission path estimation value.
- the weight processing unit 62 calculates the weight based on the carrier power information on the frequency and the reliability, and stores the weight in the storage unit 3-3.
- the power of each carrier can be accurately obtained even in a multipath fading environment by obtaining the power from the transmission path estimation value in the frequency domain.
- FIG. 5 is a diagram showing an example of pilot and data symbol arrangement.
- the horizontal axis is the time axis
- the vertical axis is the frequency axis.
- FIG. 5 shows an example using 8 carriers as an example. Pilot symbols for channel estimation are periodically arranged on the frequency, and SC block signals including the pilot symbols are periodically arranged on the time. The In the example of FIG. 5, SC block signals including pilot symbols are arranged every other symbol.
- FIG. 6 is a diagram illustrating the concept of interpolation of the transmission path estimation value of the carrier of the data symbol.
- Various methods are generally used for interpolating the transmission path estimation value of the carrier of the data symbol using the pilot symbol, and any method may be used.
- the value of the transmission path of the j-th carrier in the symbol of the i-th SC block signal is represented as h i, j .
- the value of the transmission path can be obtained using a pilot symbol or the like.
- FIG. 7 is a diagram illustrating an example of a relationship between a transmission path estimation value and power. As shown in FIG. 7, when h i, j * is a conjugate of h i, j , the power can be expressed by the following equation (4).
- the weight (weight) for the symbol of the i-th SC block signal is denoted by w i .
- the weight w i may be calculated in any way by the weight processing unit 62 as long as the information and reliability of the carrier power on the frequency are reflected. For example, if one SC block symbol is composed of N (N is an integer equal to or greater than 1) carriers, the power average of N carriers that are all carriers may be set as w i as shown in the following equation (5). maximum power in all carriers as shown in equation (6) may be the w i, the minimum power in all carriers may be w i as shown in the following equation (7).
- FIG. 8 is a diagram illustrating an example of the relationship between the weight and the power for each transmission path when the weight is calculated based on the power.
- time is taken on the horizontal axis, and weights (weights obtained using power calculated based on transmission path estimation values) w 1 , w 2 ,. Is shown.
- the weight is calculated so that the weight value becomes large at the time when the power is high, the weight value of the symbol having high power, that is, high reliability can be increased, and the reliability is high.
- a decoding result is obtained.
- the power calculation unit 61 and the weight processing unit 62 correspond to the weight calculation unit 6 of the first embodiment
- the equalization processing unit 51, the signal processing unit 52, and the demodulation unit 55 are the demodulator of the first embodiment. This corresponds to the processing unit 5. Therefore, in the present embodiment, in the procedure described in FIG. 2 of the first embodiment, the processing by the equalization processing unit 51, the signal processing unit 52, and the demodulation unit 55 is performed in step S5, and in step S6. The above-described processing of the power calculation unit 61 and the weight processing unit 62 is performed.
- the CP removal unit does not have to be provided when the CP is not inserted in the SC block signal on the transmission side, and CP is not provided when zero padding is performed on the SC block signal on the transmission side.
- a zero removing unit for removing zero is provided instead of the removing unit.
- the weight multiplied by the LLR value becomes a high value during the time when the transmission line with high power is generated, that is, a reliable decoding result is obtained.
- a reliable decoding result is obtained.
- FIG. 9 is a diagram illustrating an example of a weight calculation method according to the third embodiment of the present invention.
- the configuration of the receiving apparatus of the present embodiment is the same as that of the receiving apparatus of the second embodiment.
- the values of the transmission lines h i, j of all carriers are estimated to obtain the power
- the weight is calculated using the power of the SC block symbol including the pilot symbol, and the weight of the SC block symbol of only the data symbol is calculated by interpolation.
- FIG. 9 (1) first, the weights w 3 and w 6 of SC block symbols including pilot symbols are calculated. Next, other weights are calculated by interpolation using w 3 and w 6 (FIG. 9 (2)). Any method may be used as the interpolation method.
- the operations of the present embodiment other than those described above are the same as those of the second embodiment.
- the weight is calculated using the power of the SC block symbol including the pilot symbol, and the weight of the SC block symbol including only the data symbol is calculated by interpolation. For this reason, it is possible to improve the decoding characteristics with a small amount of calculation.
- FIG. 10 is a flowchart showing an example of a reception processing procedure according to the fourth embodiment of the present invention.
- the configuration of the receiving apparatus of the present embodiment is the same as that of the receiving apparatus of the second embodiment.
- the control unit 7 controls the operation of each storage unit and each unit, the weight calculation method can be adaptively changed. For example, when there is little change in the transmission path fluctuation, an excessive amount of calculation is required if the weight calculation is performed for each SC block symbol. Therefore, it is possible to control the past value to be written in the storage unit 3-3. is there. Further, the control unit 7 can determine whether the weight calculation process being used is effective based on a value indicating the reliability of the decoded bit output from the decoding unit 8 and change the calculation method. .
- FIG. 10 shows a flowchart when the weight calculation method is set based on the reliability of the decoding result. Steps S1 to S5 and step S7 are the same as in the first embodiment.
- the control unit 7 sets a weight calculation method for the power calculation unit 61 and the weight processing unit 62 (step S61). Then, the power calculation unit 61 and the weight processing unit 62 perform weight calculation (step S62), and step S8 similar to that in the first embodiment is performed.
- step S9 When the specified amount of demodulated signal is stored in the storage unit 3-2 (step S7 Yes) and when the specified amount of weight is stored in the storage unit 3-3 (step S8 Yes), the decoding unit 8 Processing is performed and the reliability is notified to the control unit 7 (step S91).
- the control unit 7 determines whether or not the reliability notified from the decoding unit 8 is high (greater than a predetermined value) (step S92), and when the reliability is high (Yes in step S92), outputs a decoded bit ( Step S10). If the reliability is not high (No at Step S92), the process returns to Step S61 to reset the weight calculation method.
- the weight calculation method may specify whether to use the average, maximum, or minimum value of the power as the weight, or obtain the weight after obtaining the power of all carriers as described in the second embodiment. Or, as described in the third embodiment, it may be specified whether to use the power of the SC block symbol including the pilot symbol to calculate the weight and obtain the weight by interpolation. You may specify the setting.
- a weight calculation unit is further provided separately from the power calculation unit 61 and the weight processing unit 62, and the control unit 7 includes the weight calculation unit, the power calculation unit 61, and the weight processing. You may make it select which of the part 62 is used.
- control unit 7 sets the weight calculation method based on the reliability of the decoding result. For this reason, an optimal weight calculation method can be set according to the state, and decoding characteristics can be improved.
- the receiving apparatus and the receiving method according to the present invention are useful for digital communication systems, and are particularly suitable for communication systems that perform SC block transmission.
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Abstract
Description
図1は、本発明にかかる受信装置の実施の形態1の機能構成例を示す図である。図1に示すように、本実施の形態の受信装置は、受信アンテナ1,受信処理部2,記憶部3-1,3-2,3-3,伝送路推定部4,復調処理部5,重み計算部6,制御部7,復号部8を備える。
図3は、本発明にかかる受信装置の実施の形態2の機能構成例を示す図である。本実施の形態では、受信装置の一例として、SCブロック伝送方式により生成された信号(SCブロック信号)を受信する受信装置について説明する。
図9は、本発明にかかる実施の形態3の重みの算出方法の一例を示す図である。本実施の形態の受信装置の構成は実施の形態2の受信装置と同様である。
図10は、本発明にかかる実施の形態4の受信処理手順の一例を示すフローチャートである。本実施の形態の受信装置の構成は実施の形態2の受信装置と同様である。
2 受信処理部
3-1,3-2,3-3 記憶部
4 伝送路推定部
5 復調処理部
6 重み計算部
7 制御部
8 復号部
51 等化処理部
52 信号処理部
55 復調部
61 電力計算部
62 重み処理部
521 ゼロ処理部
522 ロールオフ処理部
523 IDFT部
Claims (10)
- 受信信号を用いて伝送路推定を行い、伝送路推定値を求める伝送路推定部と、
前記伝送路推定値および前記受信信号を用いて復調処理を行う復調処理部と、
前記伝送路推定値を用いて伝送路ごとの復号用の重みを算出する重み計算部と、
前記重みと前記復調処理の結果とを用いて復号処理を行う復号部と、
を備えることを特徴とする受信装置。 - 前記受信信号を記憶するための受信信号用記憶部と、
前記重みを記憶するための重み用記憶部と、
前記復調処理の結果である復調信号を記憶するための復調信号用記憶部と、
前記受信信号用記憶部、前記重み用記憶部および前記復調信号用記憶部の入出力を制御する制御部と、
をさらに備え、
前記伝送路推定部は、前記制御部の制御により前記受信信号用記憶部から出力された受信信号を用いて前記伝送路推定を行い、
前記重み計算部は、前記重みを前記重み用記憶部へ格納し、
前記復調処理部は、前記復調処理の結果を前記復調信号用記憶部へ格納し、
前記復号部は、前記制御部の制御により前記重み用記憶部から入力される前記重みと前記制御部の制御により前記復調信号用記憶部から入力される前記復調信号とを用いて前記復号処理を行うことを特徴とする請求項1に記載の受信装置。 - 前記受信信号をSCブロック伝送により送信されたSCブロック信号とし、前記SCブロック信号に含まれるcyclic prefixを除去するCP除去部と、
cyclic prefix除去後の受信信号に対してDFT処理を行うDFT部と、
をさらに備え、
前記DFT部は、前記DFT処理後の受信信号を前記受信信号用記憶部へ格納することを特徴とする請求項2に記載の受信装置。 - 前記受信信号をSCブロック伝送により送信されたSCブロック信号とし、前記SCブロック信号に含まれるzero paddingを除去するゼロ除去部と、
zero padding除去後の受信信号に対してDFT処理を行うDFT部と、
をさらに備え、
前記DFT部は、前記DFT処理後の受信信号を前記受信信号用記憶部へ格納することを特徴とする請求項2に記載の受信装置。 - 前記復調処理部は、
前記受信信号に対して周波数領域等化を行う等化処理部と、
不使用周波数帯の信号を除去するゼロ処理部と
ロールオフフィルタ処理を行うロールオフ処理部と、
前記ロールオフフィルタ処理後の信号に対してIDFT処理を行うIDFT処理部と、
前記IDFT処理後の信号に対して復調を行う復調部と、
を備えることを特徴とする請求項3または4に記載の受信装置。 - 前記重み計算部は、
前記伝送路推定値に基づいて伝送路電力を推定して各キャリアの電力を求める電力計算部と、
前記電力に基づいて、SCシンボルごとに周波数上の電力平均値、最大値または最小値を前記重みとして求める重み処理部と、
を備えることを特徴とする請求項3、4または5に記載の受信装置。 - 前記重み計算部は、
前記伝送路推定値に基づいて伝送路電力を推定してパイロットシンボルが含まれるSCブロックシンボルの電力を求める電力計算部と、
前記電力に基づいて、パイロットシンボルが含まれるSCブロックシンボルのSCシンボルごとに電力平均値、最大値または最小値を前記重みとして求め、前記重みを用いて補間によりパイロットシンボルを含まないSCブロックシンボルの前記重みを求める重み処理部と、
を備えることを特徴とする請求項3、4または5に記載の受信装置。 - 前記制御部は、所定のシンボル数のSCシンボルに対応する前記復調信号、前記重みを前記復調信号用記憶部、前記重み用記憶部からそれぞれ前記復号部へ入力されるよう制御し、
前記復号部は、前記所定のシンボル数のSCシンボルの復号を行うことを特徴とする請求項3~7のいずれか1つに記載の受信装置。 - 前記重み計算部は前記重みの算出方法として複数の方法に対応可能とし、
前記制御部は、前記復号部による復号処理により得られる信頼度に基づいて、前記複数の方法のうちの1つを選択して前記重み計算部へ設定することを特徴する請求項2~7のいずれか1つに記載の受信装置。 - 受信信号を用いて伝送路推定を行い、伝送路推定値を求める伝送路推定ステップと、
前記伝送路推定値および前記受信信号を用いて復調処理を行う復調処理ステップと、
前記伝送路推定値を用いて伝送路ごとの復号用の重みを算出する重み計算ステップと、
前記重みと前記復調処理の結果とを用いて復号処理を行う復号ステップと、
を含むことを特徴とする受信方法。
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