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WO2008082118A1 - Appareil et procédé pour combiner une interférence considérant le signal reçu pour chaque antenne, appareil et procédé de calcul de mesure de symbole l'utilisant - Google Patents

Appareil et procédé pour combiner une interférence considérant le signal reçu pour chaque antenne, appareil et procédé de calcul de mesure de symbole l'utilisant Download PDF

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Publication number
WO2008082118A1
WO2008082118A1 PCT/KR2007/006763 KR2007006763W WO2008082118A1 WO 2008082118 A1 WO2008082118 A1 WO 2008082118A1 KR 2007006763 W KR2007006763 W KR 2007006763W WO 2008082118 A1 WO2008082118 A1 WO 2008082118A1
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WIPO (PCT)
Prior art keywords
channel
noise
estimated
interference power
antenna
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Ceased
Application number
PCT/KR2007/006763
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English (en)
Inventor
Dong-Kwan Lee
Jung-Ju Kim
Jae-Hyeong Kim
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Posdata Co Ltd
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Posdata Co Ltd
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Publication of WO2008082118A1 publication Critical patent/WO2008082118A1/fr
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Classifications

    • 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
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842—Weighted combining
    • H04B7/0848—Joint weighting
    • H04B7/0851—Joint weighting using training sequences or error signal
    • 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
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842—Weighted combining
    • H04B7/0848—Joint weighting
    • H04B7/0857—Joint weighting using maximum ratio combining techniques, e.g. signal-to- interference ratio [SIR], received signal strenght indication [RSS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/20—Monitoring; Testing of receivers
    • H04B17/26—Monitoring; Testing of receivers using historical data, averaging values or statistics
    • 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 receiving apparatus and method of a wireless communication system equipped with a plurality of transceiver antennas, particularly, to an apparatus and method for combining a received signal considering interference for each antenna, and an apparatus and method for computing symbol metric using the same.
  • FIG. 1 is a block diagram showing the configuration of a general OFDM (orthogonal frequency division multiplexing) receiver, schematically showing just only a part that restores data from a baseband signal obtained from a received signal.
  • OFDM orthogonal frequency division multiplexing
  • a burst symbol extracting unit 100 extracts the OFDM symbol from the baseband signal obtained from the received signal by a RF(Radio Frequency) processing unit (not shown).
  • the OFDM symbol is extracted by the burst symbol extracting unit 100, and the CP (Cyclic Prefix) of the OFDM symbol which is inserted from a transmitter is eliminated by a CP deleting unit 102, and FFT (Fast Fourier Transform) is performed by a FFT unit 104 to apply to an equalizer 108.
  • the equalizer 108 compensates for the channel distortion according to the channel characteristic value which is estimated by a channel estimator 106 for the FFT data signal. After the signal which is compensated for the channel distortion is demodulated in a demodulator 110, it is decoded by a decoder 112 and the data are restored by the determination of a decision unit 114.
  • the OFDM receiver is a multi-antenna receiver, and 16QAM (Quadrature Amplitude Modulation) modulation and demodulation are performed for an input signal.
  • the mapping is performed from an interleaver with one 16QAM symbol s(k) per four bits.
  • the transmitted symbol s(k) passes through the multiplicative flat fading channel of the response for the m-th antenna h .
  • the k-th receiving symbol r (k) can be expressed like Equation 1.
  • the received signal r (k) includes not only the faded symbol h (k)s(k) but also the noise v(k).
  • the noise v(k) is the zero mean complex AWGN (Additive White Gaussian Noise) having the variance ⁇ .
  • AWGN Additional White Gaussian Noise
  • the antenna coupled and channel-compensated signal is demodulated
  • LLR Log Likelihood Ratio
  • the LLR is inputted to a de-interleaver and decoded to restore the transmitted information bit.
  • the exact combining and symbol metric calculation is required in order to improve the portable Internet (WiBro/WiMax) system performance when the interference power of each antenna is different. That is, it is necessary to differentiate the weight for each channel when the interference power is different for each channel. Disclosure of Invention Technical Problem
  • a receive signal combining apparatus considering interference for each antenna in a wireless communication system equipped with at least one receive antenna, which comprises a channel estimator for receiving signals from the receive antenna, and estimating a channel by using a pilot signal of each signal received from the receive antenna; a noise and interference power estimator for receiving an output of the channel estimator, and estimating a noise and interference power of each channel; and a combining unit for channel-compensating the channels estimated in the channel estimator and the noise and interference power estimated by channel in the noise and interference power estimator, and combining the channel-compensated signals.
  • Hk is a channel estimated in the channel estimator
  • P NI (k) is a noise and interference power of the channel corresponding to k-th antenna estimated in the noise and interference power estimator
  • r(k) is a signal received from the k-th antenna.
  • the combining unit performs channel-compensating by data tone corresponding to the estimated channel and the noise and interference power estimated by channel, and combines the channel-compensated receive signals [16]
  • the noise and interference power P is expressed like the following Equation,
  • h(k) is a channel estimated in the channel estimator
  • s is a pilot gain
  • P(k) is a received pilot within a frame
  • N is the number of neighboring pilot for channel estimation
  • h i (k) is a channel response of an interferer.
  • a method of receive signal combining considering interference for each antenna in a wireless communication system equipped with at least one receive antenna which comprises receiving signals corresponding to each of the receive antenna, and estimating a channel by using a pilot signal of each of the receive signal; receiving an estimation value corresponding to the estimated channel, and estimating a noise and interference power of each channel; and channel-compensating by data tone corresponding to the estimated channel and the noise and interference power estimated by channel, and combining the channel-compensated signals.
  • a symbol metric calculation apparatus considering interference for each antenna in a wireless communication system equipped with at least one receive antenna, which comprises a channel estimator for receiving signals from the receive antenna, and estimating a channel by using a pilot signal of each signal received from the receive antenna; a noise and interference power estimator for receiving an output of the channel estimator, and estimating a noise and interference power of each channel; a combining unit for channel-compensating the channels estimated in the channel estimator and the noise and interference power estimated in the noise and interference power estimator, and combining the channel-compensated signals; a variance calculation unit for calculating a variance of data tone by using the ratio of the channel estimated in the channel estimator to a noise and interference estimated in the noise and interference power estimator; and a symbol metric calculation unit for calculating a symbol metric by using the variance calculated in the variance calculation unit and the signals combined in the combining unit.
  • the signal C combined in the combining unit is expressed like the following norm
  • the combining unit channel-compensates by data tone corresponding to the estimated channel and the noise and interference power estimated by channel, and combines the channel-compensated signals.
  • the noise and interference power P is expressed like the following Equation,
  • Hk is a channel estimated in the channel estimator
  • s is a pilot gain
  • P(k) is a received pilot within a frame
  • N is the number of neighboring pilot for channel estimation
  • h (k) is a channel response of an interferer.
  • the noise and interference power estimated in the noise and interference power estimator is P (k)
  • the sum of the interference from an antenna k is
  • the variance calculation unit calculates a variance of signal constellation of data tone by utilizing the ratio of the estimated channel to the estimated noise and interference.
  • the symbol metric calculation unit can express an LLR (Log Likelihood Ratio) like the following Equation, in case of QPSK (Quadrature Phase Shift Keying),
  • the symbol metric calculation unit can express an LLR like the following Equation, in case of 16QAM Quadrature Amplitude Modulation), [34]
  • a method of calculating a symbol metric considering interference for each antenna in a wireless communication system equipped with at least one receive antenna comprises receiving signals corresponding to each of the receive antenna, and estimating a channel by using a pilot signal of each of the receive signal; receiving an estimation value corresponding to the estimated channel, and estimating a noise and interference power of each channel; channel-compensating by data tone corresponding to the estimated channel and the noise and interference power estimated by channel, and combining the channel-compensated signals; calculating a variance of signal constellation of data tone by utilizing the ratio of the estimated channel to a estimated noise and interference; and calculating a symbol metric by using the calculated variance and the combined signals.
  • FIG. 1 is a block diagram that shows the configuration of a general OFDM receiver
  • FIG. 2 is a block diagram that shows the configuration of the received signal combining apparatus considering the interference for each antenna in a wireless communication system equipped with a plurality of receive antennas according to the present invention
  • FIG. 3 is a block diagram that shows the configuration of the received signal combining apparatus considering the interference for each antenna, using the received signal combining apparatus considering the interference for each antenna according to the present invention
  • Fig. 4 is a flowchart that shows the received signal combining method considering the interference for each antenna in a wireless communication system equipped with a plurality of receive antennas according to the present invention
  • Fig. 5 is a flowchart that shows the symbol metric calculating method considering the interference for each antenna, using the received signal combining method of Fig. 4 according to the present invention.
  • the main concept of the invention is to calculate the interference power for the exact signal combining and the symbol metric calculation when the interference power of each antenna is different, and to use it in the signal combining and symbol metric calculation. That is, the invention performs the exact MRC(Maximal Ratio Combining) and the symbol metric calculation by using the noise and interference power received from each antenna.
  • Fig. 2 is a block diagram that shows the configuration of the received signal combining apparatus considering the interference for each antenna in a wireless communication system equipped with a plurality of receive antennas according to the present invention.
  • the received signal combining apparatus includes a channel estimator 210, a noise and interference power estimator 220 and a combining unit 230.
  • the channel estimator 210 estimates a channel by using the pilot signal neighboring of data tone of the each received signal.
  • the noise and interference power estimator 220 receives a plurality of outputs which are channel estimated in the channel estimator 210, and estimates the noise and interference power of each channel.
  • the noise and interference power P estimated in the noise and interference power estimator 220 can be expressed like Equation 2.
  • the combining unit 230 performs channel-compensating by corresponding data tone for the channels which are estimated in the channel estimator 210 and the noise and interference powers which are estimated in the noise and interference power estimator 220, thereby, combing the received signals which are channel-compensated.
  • the received signal including the interference received from the antenna can be expressed show like Equation 3.
  • Equation 3 r(k)(k is 1, 2, ..., L) is a signal received from the antenna k
  • s' is a modulated symbol
  • h (k) (k is 1, 2, ..., L) is a channel response of a target user for the antenna k
  • i(k) (k is 1, 2, ..., L) is a sum of the interference from the antenna k
  • n (k) (k is 1, 2, ..., L) is a complex Gaussian noise (variance ⁇ ) from the antenna k.
  • the general MRC based on Equation 3 can be expressed show like Equation 4.
  • Equation 5 The normalized combined signal by using Equation 3 and Equation 4 can be expressed show like Equation 5.
  • h(k) is a channel estimated in the channel estimator 210
  • P (k) is a noise and interference
  • Fig. 3 is a block diagram that shows the configuration of the received signal combining apparatus considering the interference for each antenna, using the received signal combining apparatus considering the interference for each antenna according to the present invention.
  • the received signal combining apparatus includes achannel estimator 310, a noise and interference power estimator 320, a variance calculation unit 330, a combining unit 340 and a symbol metric calculation unit 350.
  • the channel estimator 310 receives a plurality of signals corresponding to each receive antenna, and estimates a channel by using the pilot signal of the neighbor of data tone of each received signal, being identical with the channel estimator 210 of Fig. 2.
  • the noise and interference power estimator 320 receives a plurality of outputs which are channel estimated in the channel estimator 310, and estimates the noise and interference power of each channel. And it is identical with the noise and interference power estimator 220 of Fig. 2.
  • the combining unit 340 performs channel-compensating by corresponding data tone for the channels which are estimated in the channel estimator 310 and the noise and interference powers which are estimated in the noise and interference power estimator 320, thereby, combing the received signals which are channel-compensated. And it is identical with the combining unit 230 of Fig. 2.
  • the variance calculation unit 330 calculates the variance of the signal constellation of data tone by utilizing the ratio of the channel estimated in the channel estimator 310 to the interference and noise estimated in the noise and interference power estimator 320.
  • the symbol metric calculation unit 350 calculates a symbol metric, by using the variance calculated in the variance calculation unit 330 and the received signals combined in the combining unit 340.
  • Equation 7 is the variance of N' which is obtained when it is
  • N' is a complex Gaussian random variable having zero mean.
  • Equation 8 is a SINR obtained by using Equation 7. [71] [Equation 8] [72]
  • SINR (k) is the SINR (Signal Interference to Noise Ratio) in the k-th antenna.
  • the decoder 360 requires the LLR (Log-Likelihood Ratio) for each information bit, the LLR is calculated based on the combined signal in the symbol metric calculation after combining.
  • the C obtained in Equation 5 is a circular-symmetric normal complex Gaussian distribution, having the mean s and the variance Var(N').
  • Var(m) of the m-th data tone within the FEC (Forward Error Correction) block is denoted as Var(m)
  • the modulate symbol and the combined symbol are expressed as s(m) and C (m) respectively.
  • Equation 9 obtains the LLR of the m-th data tone.
  • the normal variance becomes Var(m)
  • Equation 10 obtains the LLR of the b-th bit of the m- th data tone in QPSK (Quadrature Phase Shift Keying) and 16QAM (Quadrature Amplitude Modulation). In case 64QAM is also obtained like this. [78] [Equation 10]
  • the LLR in case of QPSK, the LLR can be expressed like Equation 10, and, in case of 16QAM, it can be expressed like Equation 11.
  • the LLR which it is obtained in the Equation 10 and Equation 11 is used in the symbol metric calculation. If the Var(m) is not changed in this one frame, it gives a identical contribution in the branch metric calculations within the trellis in decoding, therefore, the Var(m) can be ignored. In other words, If the Var(m) is changed tone-by-tone or slot-by-slot, the Var(m) should be considered in the symbol metric calculation as far as possible.
  • the estimation Equation of the Var(m) is shown in Equation 12.
  • Var calculated in the variance calculation unit 330 can be expressed like Equation 13, when the channel estimated in the channel estimator 310 is h(k)
  • the noise and interference power estimated in the noise and interference power estimator 320 is P (k), the sum of the interference from the antenna k is
  • Equation 14 expresses the received pilot signal.
  • P(k) is a received pilot having the index k in one frame
  • s is a pilot gain
  • h(k) is a channel response of a target user
  • h i (k) is a channel response of an interferer
  • b i (k) is a binary number (in case the mask of an interferer is identical with the mask of a target user, it is 1, otherwise, it is -1)
  • n(k) is a complex gaussian noise having the variance ⁇ .
  • Equation 15 expresses the estimated channel response which is made by averaging the pilot signal shown in Equation 14 for the neighboring N pilot including its own signal.
  • Equation 16 expresses the calculation of noise + interference power.
  • Equation 17 is expresses the power of noise and interference P by using the
  • FIG. 4 is a flowchart that shows the received signal combining method considering the interference for each antenna in a wireless communication system equipped with a plurality of receive antennas according to the present invention.
  • Equation 15 expresses the estimated channel response which is made by averaging the pilot signal for the neighboring N pilot including its own signal. Then, the noise and interference powers of a channel are estimated by the plurality of channels (S420 step).
  • the estimated noise and interference power P can be expressed like Equation 2.
  • the channel-compensated received signals are combined by channel-compensating for data tone corresponding to each channel, the noise and the interference power (S430 step).
  • the C norm can ex- pressedlike Equation 6.
  • Fig. 5 is a flowchart that shows the symbol metric calculating method considering the interference for each antenna, using the received signal combining considering the interference for each antenna according to the present invention.
  • the variance ofthe signal constellation of data tone is calculated by utilizing the ratio of the estimated channel to the estimated noise and interference (S540 step). The calculated variance
  • the symbol metric is calculated by using the calculated variance and the combined receive signals (S550 step).
  • the LLR used in the symbol metric calculation can be expressed like Equation 10, while, in case of 16QAM, it can be expressed like Equation 11.
  • functions used in an apparatus and a method disclosed in the present specification can be embodied in storage media that a computer can read as codes that the computer can read.
  • the storage media that the computer can read include all sorts of record devices in which data that can be read by a computer system is stored. Examples of the storage media that the computer can read, include ROMs, RAMs, CD- ROMs, magnetic tape, floppy discs, optic data storage devices, etc., and also, include things embodied in the form of carrier wave (e.g., transmission through the internet).
  • the storage media that the computer can read is distributed in a computer system connected with networks. Then, the codes that the computer can read, are stored in the distributed storage media in a distribution scheme, and the codes can be executed in the distribution scheme.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

L'invention concerne un appareil et un procédé permettant de combiner une interférence considérant le signal reçu pour chaque antenne, et un appareil et un procédé de calcul de mesure de symbole l'utilisant dans un système de communication sans fil équipé de plusieurs antennes d'émetteurs-récepteurs. L'appareil de calcul de mesure de symbole considérant l'interférence pour chaque antenne comprend un estimateur de canal destiné à recevoir des signaux de l'antenne de réception et à estimer un canal à l'aide d'un signal pilote de chaque signal reçu de l'antenne de réception; un estimateur de puissance de bruit et d'interférence destiné à recevoir une sortie de l'estimateur de canal et à estimer une puissance de bruit et d'interférence de chaque canal; un combineur permettant de compenser les canaux estimés dans l'estimateur de canal et la puissance de bruit et d'interférence estimée dans l'estimateur correspondant et à combiner les signaux à compensation de canal; un calculateur d'écart destiné à calculer un écart de tonalité de données en utilisant le rapport du canal estimé dans l'estimateur avec une puissance de bruit et d'interférence estimée dans l'estimateur de puissance de bruit et d'interférence; et un calculateur de mesure de symbole qui calcule une mesure de symbole en utilisant l'écart calculé dans le calculateur correspondant et des signaux combinés dans le combineur.
PCT/KR2007/006763 2006-12-29 2007-12-21 Appareil et procédé pour combiner une interférence considérant le signal reçu pour chaque antenne, appareil et procédé de calcul de mesure de symbole l'utilisant Ceased WO2008082118A1 (fr)

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KR1020060139069A KR100841936B1 (ko) 2006-12-29 2006-12-29 안테나별 간섭을 고려한 수신신호 결합 장치 및 방법과이를 이용한 심볼메트릭 산출 장치 및 방법

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WO2014124583A1 (fr) * 2013-02-18 2014-08-21 Spreadtrum Communications (Shanghai) Co., Ltd. Procédé de combinaison de signaux provenant de multiples canaux dans un récepteur multi-antenne et son appareil
US8855000B2 (en) 2011-04-28 2014-10-07 Qualcomm Incorporated Interference estimation using data traffic power and reference signal power
US8886250B2 (en) 2010-06-18 2014-11-11 Qualcomm Incorporated Channel quality reporting for different types of subframes
US9136953B2 (en) 2010-08-03 2015-09-15 Qualcomm Incorporated Interference estimation for wireless communication
US9307431B2 (en) 2010-04-13 2016-04-05 Qualcomm Incorporated Reporting of channel properties in heterogeneous networks
US9350475B2 (en) 2010-07-26 2016-05-24 Qualcomm Incorporated Physical layer signaling to user equipment in a wireless communication system
US9515773B2 (en) 2010-04-13 2016-12-06 Qualcomm Incorporated Channel state information reporting in a wireless communication network
US10320550B2 (en) 2010-04-13 2019-06-11 Qualcomm Incorporated CQI estimation in a wireless communication network

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KR102470863B1 (ko) * 2018-03-09 2022-11-28 삼성전자주식회사 간섭량 측정 방법 및 장치

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Publication number Priority date Publication date Assignee Title
US9307431B2 (en) 2010-04-13 2016-04-05 Qualcomm Incorporated Reporting of channel properties in heterogeneous networks
US9515773B2 (en) 2010-04-13 2016-12-06 Qualcomm Incorporated Channel state information reporting in a wireless communication network
US10320550B2 (en) 2010-04-13 2019-06-11 Qualcomm Incorporated CQI estimation in a wireless communication network
US8886250B2 (en) 2010-06-18 2014-11-11 Qualcomm Incorporated Channel quality reporting for different types of subframes
US9198073B2 (en) 2010-06-18 2015-11-24 Qualcomm Incorporated Channel quality reporting for different types of subframes
US9350475B2 (en) 2010-07-26 2016-05-24 Qualcomm Incorporated Physical layer signaling to user equipment in a wireless communication system
US9496974B2 (en) 2010-07-26 2016-11-15 Qualcomm Incorporated Physical layer signaling to user equipment in a wireless communication system
US9136953B2 (en) 2010-08-03 2015-09-15 Qualcomm Incorporated Interference estimation for wireless communication
US9781709B2 (en) 2010-09-27 2017-10-03 Qualcomm Incorporated Reporting of channel properties in heterogeneous networks
US8855000B2 (en) 2011-04-28 2014-10-07 Qualcomm Incorporated Interference estimation using data traffic power and reference signal power
WO2014124583A1 (fr) * 2013-02-18 2014-08-21 Spreadtrum Communications (Shanghai) Co., Ltd. Procédé de combinaison de signaux provenant de multiples canaux dans un récepteur multi-antenne et son appareil

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