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Yoshihisa Kishiyama - One of the best experts on this subject based on the ideXlab platform.
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initial cell Search Method with mld based frequency offset estimation in lte heterogeneous networks
Vehicular Technology Conference, 2017Co-Authors: Aya Shimura, Satoshi Nagata, Mamoru Sawahashi, Yoshihisa KishiyamaAbstract:This paper proposes a fast cell Search Method using maximum likelihood detection (MLD) based frequency offset estimation for a small cell in Long Term Evolution (LTE) heterogeneous networks (HetNets). In the proposed cell Search Method, a set of user equipment (UE) estimates the primary synchronization signal (PSS) timing and frequency offset using different PSS correlation computation Methods in a macrocell or a small cell according to the employed carrier frequency. For a macrocell, we use the conventional cross- correlation based detection. Meanwhile, for a small cell with a high carrier frequency, a UE first detects the maximum autocorrelation peak between the received sample signals that are five milliseconds apart. Then, the UE estimates the fractional frequency offset from the phase rotation between two consecutive PSSs. After compensating for the fractional frequency offset, the UE simultaneously detects the accurate frequency offset that provides the phase rotation of 2PIxG (G denotes an integer) over the multiplexed interval of two PSSs and the PSS sequence based on MLD. After selecting the best cell, the UE detects the best secondary synchronization signal (SSS) sequence by taking the SSS sequence correlation for the received signal. System-level simulation results show that the proposed cell Search Method achieves a fast initial cell Search time within approximately 120 ms to satisfy the physical cell ID detection probability of 95% even for the carrier frequency of a small cell up to 12 GHz, assuming the free- running frequency error of the UE standard oscillator of 3 ppm.
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initial cell Search Method based on two step frequency offset estimation for small cells in heterogeneous networks
Vehicular Technology Conference, 2016Co-Authors: Naoki Noguchi, Satoshi Nagata, Mamoru Sawahashi, Yoshihisa KishiyamaAbstract:This paper proposes a fast initial cell Search Method based on two-step frequency offset estimation for a small cell in Long Term Evolution (LTE) heterogeneous networks using different frequency spectra. In the proposed cell Search Method, a set of user equipment (UE) first estimates the frequency offset of a received primary synchronization signal (PSS) from a macrocell and computes the frequency offset of a received PSS for a small cell in Step 1 assuming the same frequency error of a temperature compensated crystal oscillator (TCXO) of a UE. The UE detects the PSS received timing from the maximum PSS correlation after compensating for the frequency offset by using the estimated value in Step 1 for the small cell. In Step 2, the UE estimates the residual frequency offset by taking a partial correlation of the PSS from the small cell. The UE detects the best secondary synchronization signal (SSS) sequence by taking the SSS sequence correlation for the received signal after compensating for the frequency offset using the estimated value in Step 2. System- level simulation results show that the proposed cell Search Method achieves a fast initial cell Search time within approximately 150 ms to satisfy the cell ID detection probability of 95% even for the carrier frequency of a small cell up to 6 and 11 GHz, assuming the free-running frequency error of the UE TCXO of 3 and 1 ppm, respectively.
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physical channel structures and cell Search Method for scalable bandwidth for ofdm radio access in evolved utra downlink
IEICE Transactions on Communications, 2007Co-Authors: Motohiro Tanno, Kenichi Higuchi, Satoshi Nagata, Yoshihisa KishiyamaAbstract:This paper proposes physical channel structures and a cell Search Method for OFDM based radio access in the Evolved UTRA (UMTS Terrestrial Radio Access) downlink, which supports multiple scalable transmission bandwidths from 1.25 to 20 MHz. In the proposed physical channel structures, the central sub-carrier of the OFDM signal is located on the frequency satisfying the 200-kHz raster condition regardless of the transmission bandwidth of the cell site. Moreover, the synchronization channel (SCH) and broadcast channel (BCH), which are necessary for cell Search, are transmitted in the central part of the entire transmission spectrum with a fixed bandwidth. In the proposed cell Search Method, a user equipment (UE) acquires the target cell in the cell Search process in the initial or connected mode employing the SCH and possibly the reference signal, which are transmitted in the central part of the given transmission bandwidth. After detecting the target cell, the UE decodes the common control information through the BCH, which is transmitted at the same frequency as the SCH, and identifies the transmission bandwidth of the cell to be connected. Computer simulations show the fast cell Search performance made possible by using the proposed SCH structure and the cell Search Method.
Mamoru Sawahashi - One of the best experts on this subject based on the ideXlab platform.
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initial cell Search Method with mld based frequency offset estimation in lte heterogeneous networks
Vehicular Technology Conference, 2017Co-Authors: Aya Shimura, Satoshi Nagata, Mamoru Sawahashi, Yoshihisa KishiyamaAbstract:This paper proposes a fast cell Search Method using maximum likelihood detection (MLD) based frequency offset estimation for a small cell in Long Term Evolution (LTE) heterogeneous networks (HetNets). In the proposed cell Search Method, a set of user equipment (UE) estimates the primary synchronization signal (PSS) timing and frequency offset using different PSS correlation computation Methods in a macrocell or a small cell according to the employed carrier frequency. For a macrocell, we use the conventional cross- correlation based detection. Meanwhile, for a small cell with a high carrier frequency, a UE first detects the maximum autocorrelation peak between the received sample signals that are five milliseconds apart. Then, the UE estimates the fractional frequency offset from the phase rotation between two consecutive PSSs. After compensating for the fractional frequency offset, the UE simultaneously detects the accurate frequency offset that provides the phase rotation of 2PIxG (G denotes an integer) over the multiplexed interval of two PSSs and the PSS sequence based on MLD. After selecting the best cell, the UE detects the best secondary synchronization signal (SSS) sequence by taking the SSS sequence correlation for the received signal. System-level simulation results show that the proposed cell Search Method achieves a fast initial cell Search time within approximately 120 ms to satisfy the physical cell ID detection probability of 95% even for the carrier frequency of a small cell up to 12 GHz, assuming the free- running frequency error of the UE standard oscillator of 3 ppm.
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initial cell Search Method based on two step frequency offset estimation for small cells in heterogeneous networks
Vehicular Technology Conference, 2016Co-Authors: Naoki Noguchi, Satoshi Nagata, Mamoru Sawahashi, Yoshihisa KishiyamaAbstract:This paper proposes a fast initial cell Search Method based on two-step frequency offset estimation for a small cell in Long Term Evolution (LTE) heterogeneous networks using different frequency spectra. In the proposed cell Search Method, a set of user equipment (UE) first estimates the frequency offset of a received primary synchronization signal (PSS) from a macrocell and computes the frequency offset of a received PSS for a small cell in Step 1 assuming the same frequency error of a temperature compensated crystal oscillator (TCXO) of a UE. The UE detects the PSS received timing from the maximum PSS correlation after compensating for the frequency offset by using the estimated value in Step 1 for the small cell. In Step 2, the UE estimates the residual frequency offset by taking a partial correlation of the PSS from the small cell. The UE detects the best secondary synchronization signal (SSS) sequence by taking the SSS sequence correlation for the received signal after compensating for the frequency offset using the estimated value in Step 2. System- level simulation results show that the proposed cell Search Method achieves a fast initial cell Search time within approximately 150 ms to satisfy the cell ID detection probability of 95% even for the carrier frequency of a small cell up to 6 and 11 GHz, assuming the free-running frequency error of the UE TCXO of 3 and 1 ppm, respectively.
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physical channel structures and cell Search Method for scalable bandwidth for ofdm radio access in evolved utra downlink
Wireless Communications and Networking Conference, 2007Co-Authors: Motohiro Tanno, Kenichi Higuchi, Satoshi Nagata, Y Kishiyana, Mamoru SawahashiAbstract:This paper proposes physical channel structures and a cell Search Method for OFDM based radio access in the evolved UTRA (UMTS Terrestrial Radio Access) downlink, which supports multiple scalable transmission bandwidths from 1.25 to 20 MHz, in the proposed physical channel structures, the central sub-carrier of the OFDM signal is located on the frequency satisfying the 200-kHz raster condition regardless of the transmission bandwidth of the cell site. Moreover, the synchronization channel (SCH) and broadcast channel (BCH), which are necessary for cell Search, are transmitted from the central part of the entire transmission spectrum with a fixed bandwidth. In the proposed cell Search Method, a user equipment (UE) acquires the target cell in the cell Search process in the initial or connected mode employing the SCH and possibly the reference signal, which are transmitted from the central part of the given transmission bandwidth. Alter detecting the target cell, the UE decodes the common control information through the BCH, which is transmitted at the same frequency as the SCH, and identifies the transmission bandwidth of the cell to be connected. Computer simulations show the fast cell Search time performance using the proposed SCH structure and the cell Search Method.
Satoshi Nagata - One of the best experts on this subject based on the ideXlab platform.
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initial cell Search Method with mld based frequency offset estimation in lte heterogeneous networks
Vehicular Technology Conference, 2017Co-Authors: Aya Shimura, Satoshi Nagata, Mamoru Sawahashi, Yoshihisa KishiyamaAbstract:This paper proposes a fast cell Search Method using maximum likelihood detection (MLD) based frequency offset estimation for a small cell in Long Term Evolution (LTE) heterogeneous networks (HetNets). In the proposed cell Search Method, a set of user equipment (UE) estimates the primary synchronization signal (PSS) timing and frequency offset using different PSS correlation computation Methods in a macrocell or a small cell according to the employed carrier frequency. For a macrocell, we use the conventional cross- correlation based detection. Meanwhile, for a small cell with a high carrier frequency, a UE first detects the maximum autocorrelation peak between the received sample signals that are five milliseconds apart. Then, the UE estimates the fractional frequency offset from the phase rotation between two consecutive PSSs. After compensating for the fractional frequency offset, the UE simultaneously detects the accurate frequency offset that provides the phase rotation of 2PIxG (G denotes an integer) over the multiplexed interval of two PSSs and the PSS sequence based on MLD. After selecting the best cell, the UE detects the best secondary synchronization signal (SSS) sequence by taking the SSS sequence correlation for the received signal. System-level simulation results show that the proposed cell Search Method achieves a fast initial cell Search time within approximately 120 ms to satisfy the physical cell ID detection probability of 95% even for the carrier frequency of a small cell up to 12 GHz, assuming the free- running frequency error of the UE standard oscillator of 3 ppm.
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initial cell Search Method based on two step frequency offset estimation for small cells in heterogeneous networks
Vehicular Technology Conference, 2016Co-Authors: Naoki Noguchi, Satoshi Nagata, Mamoru Sawahashi, Yoshihisa KishiyamaAbstract:This paper proposes a fast initial cell Search Method based on two-step frequency offset estimation for a small cell in Long Term Evolution (LTE) heterogeneous networks using different frequency spectra. In the proposed cell Search Method, a set of user equipment (UE) first estimates the frequency offset of a received primary synchronization signal (PSS) from a macrocell and computes the frequency offset of a received PSS for a small cell in Step 1 assuming the same frequency error of a temperature compensated crystal oscillator (TCXO) of a UE. The UE detects the PSS received timing from the maximum PSS correlation after compensating for the frequency offset by using the estimated value in Step 1 for the small cell. In Step 2, the UE estimates the residual frequency offset by taking a partial correlation of the PSS from the small cell. The UE detects the best secondary synchronization signal (SSS) sequence by taking the SSS sequence correlation for the received signal after compensating for the frequency offset using the estimated value in Step 2. System- level simulation results show that the proposed cell Search Method achieves a fast initial cell Search time within approximately 150 ms to satisfy the cell ID detection probability of 95% even for the carrier frequency of a small cell up to 6 and 11 GHz, assuming the free-running frequency error of the UE TCXO of 3 and 1 ppm, respectively.
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physical channel structures and cell Search Method for scalable bandwidth for ofdm radio access in evolved utra downlink
IEICE Transactions on Communications, 2007Co-Authors: Motohiro Tanno, Kenichi Higuchi, Satoshi Nagata, Yoshihisa KishiyamaAbstract:This paper proposes physical channel structures and a cell Search Method for OFDM based radio access in the Evolved UTRA (UMTS Terrestrial Radio Access) downlink, which supports multiple scalable transmission bandwidths from 1.25 to 20 MHz. In the proposed physical channel structures, the central sub-carrier of the OFDM signal is located on the frequency satisfying the 200-kHz raster condition regardless of the transmission bandwidth of the cell site. Moreover, the synchronization channel (SCH) and broadcast channel (BCH), which are necessary for cell Search, are transmitted in the central part of the entire transmission spectrum with a fixed bandwidth. In the proposed cell Search Method, a user equipment (UE) acquires the target cell in the cell Search process in the initial or connected mode employing the SCH and possibly the reference signal, which are transmitted in the central part of the given transmission bandwidth. After detecting the target cell, the UE decodes the common control information through the BCH, which is transmitted at the same frequency as the SCH, and identifies the transmission bandwidth of the cell to be connected. Computer simulations show the fast cell Search performance made possible by using the proposed SCH structure and the cell Search Method.
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physical channel structures and cell Search Method for scalable bandwidth for ofdm radio access in evolved utra downlink
Wireless Communications and Networking Conference, 2007Co-Authors: Motohiro Tanno, Kenichi Higuchi, Satoshi Nagata, Y Kishiyana, Mamoru SawahashiAbstract:This paper proposes physical channel structures and a cell Search Method for OFDM based radio access in the evolved UTRA (UMTS Terrestrial Radio Access) downlink, which supports multiple scalable transmission bandwidths from 1.25 to 20 MHz, in the proposed physical channel structures, the central sub-carrier of the OFDM signal is located on the frequency satisfying the 200-kHz raster condition regardless of the transmission bandwidth of the cell site. Moreover, the synchronization channel (SCH) and broadcast channel (BCH), which are necessary for cell Search, are transmitted from the central part of the entire transmission spectrum with a fixed bandwidth. In the proposed cell Search Method, a user equipment (UE) acquires the target cell in the cell Search process in the initial or connected mode employing the SCH and possibly the reference signal, which are transmitted from the central part of the given transmission bandwidth. Alter detecting the target cell, the UE decodes the common control information through the BCH, which is transmitted at the same frequency as the SCH, and identifies the transmission bandwidth of the cell to be connected. Computer simulations show the fast cell Search time performance using the proposed SCH structure and the cell Search Method.
Emanuela Merelli - One of the best experts on this subject based on the ideXlab platform.
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a tabu Search Method guided by shifting bottleneck for the job shop scheduling problem
European Journal of Operational Research, 2000Co-Authors: Ferdinando Pezzella, Emanuela MerelliAbstract:Abstract A computationally effective heuristic Method for solving the minimum makespan problem of job shop scheduling is presented. The proposed local Search Method is based on a tabu Search technique and on the shifting bottleneck procedure used to generate the initial solution and to refine the next-current solutions. Computational experiments on a standard set of problem instances show that, in several cases, our approach, in a reasonable amount of computer time, yields better results than the other heuristic procedures discussed in the literature.
Naoki Noguchi - One of the best experts on this subject based on the ideXlab platform.
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initial cell Search Method based on two step frequency offset estimation for small cells in heterogeneous networks
Vehicular Technology Conference, 2016Co-Authors: Naoki Noguchi, Satoshi Nagata, Mamoru Sawahashi, Yoshihisa KishiyamaAbstract:This paper proposes a fast initial cell Search Method based on two-step frequency offset estimation for a small cell in Long Term Evolution (LTE) heterogeneous networks using different frequency spectra. In the proposed cell Search Method, a set of user equipment (UE) first estimates the frequency offset of a received primary synchronization signal (PSS) from a macrocell and computes the frequency offset of a received PSS for a small cell in Step 1 assuming the same frequency error of a temperature compensated crystal oscillator (TCXO) of a UE. The UE detects the PSS received timing from the maximum PSS correlation after compensating for the frequency offset by using the estimated value in Step 1 for the small cell. In Step 2, the UE estimates the residual frequency offset by taking a partial correlation of the PSS from the small cell. The UE detects the best secondary synchronization signal (SSS) sequence by taking the SSS sequence correlation for the received signal after compensating for the frequency offset using the estimated value in Step 2. System- level simulation results show that the proposed cell Search Method achieves a fast initial cell Search time within approximately 150 ms to satisfy the cell ID detection probability of 95% even for the carrier frequency of a small cell up to 6 and 11 GHz, assuming the free-running frequency error of the UE TCXO of 3 and 1 ppm, respectively.
