公开(公告)号：US12088435B2

公开(公告)日：2024-09-10

申请号：US18181515

申请日：2023-03-09

申请人： YUAN ZE UNIVERSITY

发明人： Jeng-Kuang Hwang ,  Cheng-Feng Li

IPC分类号： H04L25/03 ,  H03H17/02

CPC分类号： H04L25/03159 ,  H03H17/02

摘要： A two-stage filter is provided. A first stage filter performs a first stage filtering operation on an initial signal to adjust a frequency of the initial signal to output a first filtered signal. A second stage filter is connected to the first stage filter. The second stage filter performs a second stage filtering operation on the first filtered signal to filter an interference component that is generated during the first stage filtering operation from the first filtered signal to output a second filtered signal.

公开(公告)号：US20240187287A1

公开(公告)日：2024-06-06

申请号：US18527898

申请日：2023-12-04

申请人： AGENCY FOR DEFENSE DEVELOPMENT ,  Hanbat National University Industry-Academic Cooperation Foundation ,  AJOU UNIVERSITY INDUSTRY-ACADEMIC COOPERATION FOUNDATION

发明人： Jae Seang LEE ,  Sung Min LEE ,  Joo Hang SON ,  Soo Il KIM ,  Eui Rim JEONG ,  Kyung Woo KIM ,  Jae Hyun KIM

IPC分类号： H04L25/03 ,  H04L27/26

CPC分类号： H04L25/03159 ,  H04L27/2607

摘要： A transmission apparatus of a single carrier-based wireless communication system is proposed. The transmission apparatus may include a transceiver, a memory configured to store one or more instructions; and a processor configured to execute the one or more instructions stored in the memory. The processor may generate data symbols by modulating traffic data, generate a cyclic prefix (CP) on the basis of the data symbols, and generate a pilot symbol for the data symbol. The transceiver may transmit a single carrier frequency domain equalizer (SC-FDE) frame including the data symbol, the CP, and the pilot symbol. The data symbols may include first data symbols and second data symbols. The pilot symbol may be transmitted after transmission of the first data symbols and before transmission of the second data symbols.

公开(公告)号：US11901933B2

公开(公告)日：2024-02-13

申请号：US17734489

申请日：2022-05-02

申请人： Samsung Electronics Co., Ltd.

发明人： Mostafa Sayed Roshdy Ibrahim ,  Ruchen Duan ,  Wook Bong Lee ,  Minki Ahn ,  Hyun Bae Jeon

IPC分类号： H04B7/10 ,  H04B1/71 ,  H04B17/345 ,  H04B1/10 ,  H04L25/02 ,  H04L25/03

CPC分类号： H04B1/7102 ,  H04B1/10 ,  H04B17/345 ,  H04L25/022 ,  H04L25/03159

摘要： A method and system for providing sub-band whitening are herein provided. According to one embodiment, a method includes deriving an estimated noise plus interference variance (NIVar) based on at least one legacy-long training field (LLTF) symbol from an LLTF signal; and updating an interference whitening (IW) factor by using a sub-band NIVar.

公开(公告)号：US20230388044A1

公开(公告)日：2023-11-30

申请号：US17804479

申请日：2022-05-27

申请人： QUALCOMM Incorporated

发明人： Xiaoxia ZHANG ,  Bin TIAN ,  Jing SUN ,  Junyi LI

IPC分类号： H04L1/00 ,  H04L27/26 ,  H04L25/03 ,  H04L27/36

CPC分类号： H04L1/0003 ,  H04L27/2605 ,  H04L25/03159 ,  H04L27/36

摘要： Aspects presented herein may improve communications at high bandwidth or coverage limited scenarios, which may specify high transceiver energy efficiency and robustness to non-linear power amplifiers. In one aspect, a first network node transmits first information indicative of at least one of a modulation scheme or a modulation parameter to a second network node, where the modulation scheme is from a set of modulation schemes and the modulation parameter is associated with the modulation scheme, and where the set of modulation schemes includes one or more of: APSK, QAM, CPM, ceCPM, or MACPM. The first network node, from the second network node, second information indicative of at least one of the modulation scheme or the modulation parameter associated with the modulation scheme for at least one transmission.

公开(公告)号：US20230299913A1

公开(公告)日：2023-09-21

申请号：US18323966

申请日：2023-05-25

申请人： Sun Patent Trust

发明人： Takashi Iwai ,  Sadaki Futagi ,  Tomohumi Takata ,  Daichi Imamura ,  Yoshihiko Ogawa

IPC分类号： H04L5/00 ,  H04L25/02 ,  H04L27/26

CPC分类号： H04L5/0048 ,  H04L25/0226 ,  H04L27/2613 ,  H04L25/022 ,  H04L25/03159

摘要： Disclosed are a wireless transmitter and a reference signal transmission method that improve channel estimation accuracy. In a terminal, which transmits a reference signal using n (n is a non-negative integer 2 or greater) band blocks (which correspond to clusters here), which are disposed with spaces therebetween in a frequency direction, a reference signal controller switches the reference signal formation method of a reference signal generator between a first formation method and a second formation method based on the number (n) of band blocks. In addition, a threshold value setting unit adjusts a switching threshold value based on the frequency spacing between band blocks. Thus, the reference signal formation method can be selected with good accuracy and, as a result, channel estimation accuracy is further improved.

公开(公告)号：US20230291621A1

公开(公告)日：2023-09-14

申请号：US18319232

申请日：2023-05-17

申请人： NTT DOCOMO, INC.

发明人： Hiroki Harada ,  Satoshi Nagata ,  Shaozhen Guo ,  Jing Wang ,  Xin Wang ,  Xiaolin Hou

IPC分类号： H04L25/03 ,  H04L27/26

CPC分类号： H04L25/03834 ,  H04L27/26025 ,  H04L25/03159 ,  H04L25/03343

摘要： A terminal includes a transmitting and receiving unit and a control unit. The transmitting and receiving unit transmits and receives a slot including a plurality of symbols. The control unit determines number of symbols included in a sub-frame on the basis of a time length of the symbol. The control unit determines the number of symbols included in the sub-frame according to a degree of modulation at which the time length of the symbol varies.

公开(公告)号：US20230231747A1

公开(公告)日：2023-07-20

申请号：US17769634

申请日：2019-11-05

申请人： MORNINGCORE TECHNOLOGY CO., CHINA

发明人： Wenjie Chen ,  Chaowei Yi

IPC分类号： H04L25/03 ,  H04L25/02

CPC分类号： H04L25/03159 ,  H04L25/022

摘要： Provided are a channel flatness compensation method, a channel flatness compensation apparatus, a storage medium, a baseband chip, and a device, wherein the method is applied to a transmitting link modulated by orthogonal frequency division multiplexing and includes: receiving an input vector of a current sub-carrier subjected to sub-carrier mapping processing, and determining current values of preset configuration parameters corresponding to the current sub-carrier; querying a preset frequency domain compensation table according to the current values of the preset configuration parameters, and determining a target compensation vector according to a query result; and determining an output vector of the current sub-carrier according to the input vector and the target compensation vector, wherein the output vector is used in an inverse fast Fourier transform operation.

公开(公告)号：US20190199494A1

公开(公告)日：2019-06-27

申请号：US16287611

申请日：2019-02-27

申请人： Sun Patent Trust

发明人： Takashi IWAI ,  Sadaki FUTAGI ,  Tomohumi TAKATA ,  Daichi IMAMURA ,  Yoshihiko OGAWA

IPC分类号： H04L5/00 ,  H04L25/02 ,  H04L27/26

CPC分类号： H04L5/0048 ,  H04L25/022 ,  H04L25/0226 ,  H04L25/03159 ,  H04L27/2613

摘要： Disclosed are a wireless transmitter and a reference signal transmission method that improve channel estimation accuracy. In a terminal, which transmits a reference signal using n (n is a non-negative integer 2 or greater) band blocks (which correspond to clusters here), which are disposed with spaces therebetween in a frequency direction, a reference signal controller switches the reference signal formation method of a reference signal generator between a first formation method and a second formation method based on the number (n) of band blocks. In addition, a threshold value setting unit adjusts a switching threshold value based on the frequency spacing between band blocks. Thus, the reference signal formation method can be selected with good accuracy and, as a result, channel estimation accuracy is further improved.

公开(公告)号：US20180309598A1

公开(公告)日：2018-10-25

申请号：US15756109

申请日：2016-08-31

申请人： Centro De Investigation Y De Estudios Avanzados Del Instituto Politecnico Nacional

发明人： Fernando PENA CAMPOS ,  Valeri KONTOROVICH MAZOVER ,  Ramon PARRA MICHEL

IPC分类号： H04L25/02 ,  H04L25/03

CPC分类号： H04L25/0222 ,  H04L5/0048 ,  H04L25/0224 ,  H04L25/0242 ,  H04L25/0244 ,  H04L25/0248 ,  H04L25/03159 ,  H04L27/2697

摘要： A modified orthogonal frequency-division multiplexing (OFDM) communication system based on virtual decomposition of the channel is proposed. The system is fully compatible with standard OFDM transmitters and maintains several blocks of standard OFDM receivers. The proposed approach achieves also incoherent reception of multicarrier signals even with a simple autocovariance DPSK detector. This novel system substantially surpasses the performance of current approaches while requiring low computational complexity. Two preferred embodiments are described; one with coherent reception using pilot signals, and the second with incoherent receiver of differentially encoded signals.

公开(公告)号：US10084622B2

公开(公告)日：2018-09-25

申请号：US15328885

申请日：2014-11-28

申请人： ZTE Corporation

发明人： Jidong Wei

IPC分类号： H04L25/03 ,  H04L27/26

CPC分类号： H04L25/03821 ,  H04L25/03159 ,  H04L27/2628 ,  H04L27/2647 ,  H04L27/265

摘要： The embodiment of the disclosure discloses a method and device for eliminating Inter-Carrier Interference (ICI) and a computer storage medium. The method for eliminating the ICI includes that: a user frequency offset value is acquired; an order of a filter is determined according to the user frequency offset value; a filter coefficient is constructed according to the order of the filter; user carrier data is received; and ICI elimination is performed on a target subcarrier according to frequency-domain data on adjacent subcarriers of the target subcarrier and filter coefficients of corresponding positions of the adjacent subcarriers, wherein the target subcarrier is any carrier in the user carrier data.