Abstract: A communication system and a codec method based on deep learning and known channel state information (CSI) are provided. The communication system includes: a first electronic apparatus including a known first link CSI and a CSI encoder having a deep learning function; and a second electronic apparatus including a known second link CSI and a CSI decoder having a deep learning function. The first and second link CSIs have a correlation or a similarity. The CSI encoder of the first electronic apparatus encodes or compresses the first link CSI into the first codeword, and feeds the first codeword back to the second electronic apparatus via a feedback link. The CSI decoder of the second electronic apparatus encodes or compresses the second link CSI into a second codeword, and decodes or restores the first link CSI of the first electronic apparatus based on the first codeword and the second codeword.

Abstract: An aspect of the disclosure includes a beam indication method for a multibeam wireless communication system, including: obtaining a number of candidate beams and a number of active beams to determine a plurality of beam groups, wherein the beam groups are selections of the active beams from the candidate beams; extracting a plurality of sets of the beam groups from the beam groups, wherein the plurality of sets of the beam groups comprises a first beam group set; assigning a first indicator to the first beam group set; assigning a beam indicator to one of the beam groups in the first beam group set to generate a codebook for beam indication according to the first indicator and the beam indicator.

Abstract: A software-defined radio system for detecting packets is disclosed, including: a transmitting end configured for assigning a preamble and a postamble to a start position and an end position of a packet of a signal, respectively, before transmitting the signal; and a receiving end configured for detecting if a packet exists in the air or in a channel based on the preamble and the postamble, wherein the receiving end stores the signal in memory when detecting the preamble, and stops storing the signal in the memory and transmits the signal to a computing device when detecting the postamble. A packet detection method for a software-defined radio system is also provided.

Abstract: A communication system and a codec method based on deep learning and known channel state information (CSI) are provided. The communication system includes: a first electronic apparatus including a known first link CSI and a CSI encoder having a deep learning function; and a second electronic apparatus including a known second link CSI and a CSI decoder having a deep learning function. The first and second link CSIs have a correlation or a similarity. The CSI encoder of the first electronic apparatus encodes or compresses the first link CSI into the first codeword, and feeds the first codeword back to the second electronic apparatus via a feedback link. The CSI decoder of the second electronic apparatus encodes or compresses the second link CSI into a second codeword, and decodes or restores the first link CSI of the first electronic apparatus based on the first codeword and the second codeword.

Abstract: Methods and apparatus for indicating a radio resource to a receiver in a wireless communication system, the method including allocating a plurality of reference signals (RSs) for beam indication, selecting one of the plurality of RSs for the receiver, and transmitting information about the selected RS to the receiver, wherein the information includes a reference indication (RI) that indicates the radio resource of the selected RS.

Abstract: A software-defined radio system for detecting packets is disclosed, including: a transmitting end configured for assigning a preamble and a postamble to a start position and an end position of a packet of a signal, respectively, before transmitting the signal; and a receiving end configured for detecting if a packet exists in the air or in a channel based on the preamble and the postamble, wherein the receiving end stores the signal in memory when detecting the preamble, and stops storing the signal in the memory and transmits the signal to a computing device when detecting the postamble. A packet detection method for a software-defined radio system is also provided.

Abstract: In one of the exemplary embodiments, the disclosure is directed to a post network entry connection method applicable to a user equipment. The method would include not limited to: receiving a time unit which may include a payload region and a downlink header region which may include a first BQMR for a first scan beam and a second BQMR for a second scan beam; obtaining a first reference signal from the first BQMR and a second reference signal from the second BQMR; calculating a first signal quality measurement by using the first reference signal and calculating a second signal quality measurement by using the second reference signal; selecting the first scan beam based on the first signal quality measurement being better than at least the second signal quality measurement; and transmitting the first signal quality measurement which corresponds to the first scan beam via another time unit.

Abstract: A method of ultrasound imaging and a corresponding ultrasound scanner are provided. The method includes the steps of receiving an echo signal induced by an ultrasonic plane wave transmission from a transducer of an ultrasound scanner, resampling the echo signal in time domain and/or space domain, performing a spectrum zooming on a band of interest (BOI) of an input signal, performing a Fourier transform on a result of the spectrum zooming, and generating an ultrasound image based on a result of the Fourier transform. The input signal is generated based on the resampling of the echo signal.

Abstract: Methods and apparatus for indicating a radio resource to a receiver in a wireless communication system, the method including allocating a plurality of reference signals (RSs) for beam indication, selecting one of the plurality of RSs for the receiver, and transmitting information about the selected RS to the receiver, wherein the information includes a reference indication (RI) that indicates the radio resource of the selected RS.

Abstract: An aspect of the disclosure includes a beam indication method for a multibeam wireless communication system, including: obtaining a number of candidate beams and a number of active beams to determine a plurality of beam groups, wherein the beam groups are selections of the active beams from the candidate beams; extracting a plurality of sets of the beam groups from the beam groups, wherein the plurality of sets of the beam groups comprises a first beam group set; assigning a first indicator to the first beam group set; assigning a beam indicator to one of the beam groups in the first beam group set to generate a codebook for beam indication according to the first indicator and the beam indicator.

Abstract: A beamforming method of millimeter wave communication is introduced herein. the beamforming method is adapted to a base station and includes following steps. A plurality of periodic signals are transmitted by using a frame header of M radio frames via Q base station beams designated as Q scan beams while performing a network entry, wherein M?1 and Q?1. Data packets are transceived by using a payload region of the M radio frames via at least one scheduled beam while a user equipment connection is performed via the scheduled beam selected from the Q base station beams.

Abstract: A visible light communication method performs visible light communication by using a visible light source. In searching a central frequency of the visible light source, a plurality of central-frequency training packets are sent, the central-frequency training packets including a plurality of central-frequency candidates, and one among the plurality of central-frequency candidates is selected as the central frequency of the visible light source based on a first decoding result on the plurality of central-frequency training packets. In searching a bandwidth of the visible light source, a plurality of bandwidth training packets are sent, the bandwidth training packets including a plurality of bandwidth candidates and the central frequency of the visible light source, and one among the plurality of bandwidth candidates is selected as the bandwidth of the visible light source based on a second decoding result on the plurality of bandwidth training packets.

Abstract: According to one of the exemplary embodiments, the proposed network entry method is applicable to a user equipment and includes: receiving, within an mmWave band, Q scan beams which have Q IDs over M mmWave time units as each mmWave time unit includes a payload region and a BF header region that includes N BSSs with each of the BSSs corresponding to a different one of the Q scan beams, wherein M, N, and Q are integers greater than 1 and M*N=Q; determining a best beam of the UE based on the BSSs of the Q scan beams; determining a best scan beam of the Q scan beams based on the BSSs of the Q scan beams after determining the best beam of the UE; and transmitting, within the mmWave band, a random access preamble (RAP) by using the best beam of the UE.

Abstract: A user equipment includes: an antenna array for receiving a plurality of wireless signals from a plurality of beams; and a processing unit, coupled to the antenna array, the processing unit being configured to measure a plurality of wireless signal quality of the wireless signals to determine a target wireless signal quality among the plurality of wireless signal quality and the processing unit being configured to select, among the sectors, a beam emitting the target wireless signal quality as a preferred sector beam. The processing unit controls the antenna array to send to a current service sector beam of the beams a preferred sector beam transmission time index and a beam scan sequence ID corresponding to the target wireless signal quality.

Abstract: An aspect of the disclosure includes a beam tracking method used by a user equipment, the method would include: receiving, within a first time period, a first plurality of reference signal sequences including a first reference signal sequence associated with a first cell beam and a second reference signal sequence associated with a second cell beam; measure a beam quality which include a first measurement of a first cell beam and a second measurement of a second cell beam; generating, based on the beam quality, a measurement report; and transmitting the measurement report.

Abstract: A visible light communication method performs visible light communication by using a visible light source. In searching a central frequency of the visible light source, a plurality of central-frequency training packets are sent, the central-frequency training packets including a plurality of central-frequency candidates, and one among the plurality of central-frequency candidates is selected as the central frequency of the visible light source based on a first decoding result on the plurality of central-frequency training packets. In searching a bandwidth of the visible light source, a plurality of bandwidth training packets are sent, the bandwidth training packets including a plurality of bandwidth candidates and the central frequency of the visible light source, and one among the plurality of bandwidth candidates is selected as the bandwidth of the visible light source based on a second decoding result on the plurality of bandwidth training packets.

Abstract: The present disclosure proposes a hierarchical beamforming method and a base station and a user equipment using the same. The method includes following steps. A network entry procedure is performed via a plurality of coarse beams by using a superframe header of a superframe corresponding to each of the coarse beams. In response to a success message associated with the network entry procedure being received, a network entry done message is transmitted by using a preferred coarse beam among the coarse beams. A user equipment (UE) connection is performed via a plurality of fine beams within a direction range of the preferred coarse beam, so as to determine a preferred fine beam by using a frame header of a basic frame corresponding to each of the fine beams, and perform a data packet transmission by using a packet transmission block of the basic frame corresponding to the preferred fine beam.

Abstract: According to an exemplary embodiment, an ultrasound apparatus for beamforming with a plane wave transmission may comprise a transceiver connected to a transducer array having at least one transducer element, and at least one processor. The transceiver transmits at least one substantially planar ultrasonic wave into a target region at one or more angles relative to the transducer array, and receives one or more signals responsive from the transducer array. The at least one processor applies a fast Fourier transform (FFT) to the one or more signals from each of the at least one transducer element and calculates at least one frequency within a frequency region, and applies an inverse FFT to at least one produced frequency data.

Abstract: A method and apparatus for performing precoding matrix indicator (PMI) feedback are provided. The apparatus may include at least one storage device containing a computer program, at least one processing circuit and related control/computing devices. The at least one processing circuit is configured with at least one storage device and computer program to feed back the selected PMI and to receive related signalings of the PMI feedback method. One of the signalings includes the precoder candidate set configuration which defines the subset of precoders in a codebook for each precoder to report PMI next time. The selected PMI is transmitted by the apparatus to the corresponding communication device in the communication network.

Abstract: According to one of the exemplary embodiments, the proposed network entry method is applicable to a user equipment and includes: receiving, within an mmWave band, Q scan beams which have Q IDs over M mmWave time units as each mmWave time unit includes a payload region and a BF header region that includes N BSSs with each of the BSSs corresponding to a different one of the Q scan beams, wherein M, N, and Q are integers greater than 1 and M*N=Q; determining a best beam of the UE based on the BSSs of the Q scan beams; determining a best scan beam of the Q scan beams based on the BSSs of the Q scan beams after determining the best beam of the UE; and transmitting, within the mmWave band, a random access preamble (RAP) by using the best beam of the UE.