公开(公告)号：US20160006632A1

公开(公告)日：2016-01-07

申请号：US14324258

申请日：2014-07-07

Applicant: Mediatek Inc.

Inventor： Kuo-Hao Chen ,  Chun-Hao Liao ,  KIRAN ULN ,  Shuling Feng

IPC: H04L12/26

CPC classification number: H04L27/2089 ,  H04L5/0023 ,  H04L27/2646 ,  H04L27/364

Abstract: A communication unit includes: a quadrature transmitter having analog transmit filter(s) for filtering a first quadrature test signal. An analog feedback loopback path selectively first routes the filtered quadrature first test signal to a quadrature receiver. The quadrature receiver has: at least one analog receive filter for further filtering the filtered quadrature first test signal; and a quadrature receive baseband circuit arranged to receive and decode the further filtered quadrature first test signal. The quadrature transmitter is arranged to receive a second quadrature test signal and the analog feedback loopback path selectively routes a filtered quadrature second test signal to the quadrature receiver via a second route such that the quadrature receive baseband circuit is arranged to determine a frequency-dependent quadrature imbalance of at least one component in the transmitter/receiver based on the decoded further filtered first quadrature test signal and the decoded further filtered second quadrature test signal.

Abstract translation: 通信单元包括：具有用于对第一正交测试信号进行滤波的模拟发射滤波器的正交发射机。 模拟反馈环回路径选择性地首先将滤波的正交第一测试信号路由到正交接收机。 正交接收机具有：至少一个模拟接收滤波器，用于进一步滤波滤波的正交第一测试信号; 以及正交接收基带电路，被布置为接收和解码进一步滤波的正交第一测试信号。 正交发射器被布置成接收第二正交测试信号，并且模拟反馈环回路径经由第二路径选择性地将滤波的正交第二测试信号路由到正交接收机，使得正交接收基带电路被布置成确定频率相关的正交 基于解码的进一步滤波的第一正交测试信号和解码的进一步滤波的第二正交测试信号，发射机/接收机中的至少一个分量的不平衡。

公开(公告)号：US20170063512A1

公开(公告)日：2017-03-02

申请号：US15123247

申请日：2015-03-04

Applicant: Tianyu Wu ,  Jianhan Liu ,  KIRAN ULN ,  Thomas Edward Pare, JR. ,  MEDIATEK INC.

Inventor： Tianyu Wu ,  Jianhan Liu ,  KIRAN ULN ,  Thomas Edward Pare, JR.

IPC: H04L5/00 ,  H04W72/08 ,  H04W72/04 ,  H04B7/04

CPC classification number: H04L5/0057 ,  H04B7/0417 ,  H04B7/0452 ,  H04B7/0623 ,  H04B7/0626 ,  H04B7/0632 ,  H04B17/24 ,  H04B17/336 ,  H04L1/1671 ,  H04L1/1685 ,  H04L5/0023 ,  H04L5/0048 ,  H04L25/0204 ,  H04W72/0446 ,  H04W72/082

Abstract: A method of sub-channel feedback in OFDMA systems is provided. A wireless receiving device (STA) receives a radio signal from a transmitting device (AP) over a wide channel in an OFDMA system. The radio signal is transmitted over multiple sub-channels of the wide channel. The STA estimates channel quality information based on the received radio signal for each sub-channel. The STA then sends feedback information to the transmitting device. The feedback information comprises the estimated channel quality information for a selected subset of sub-channels from the wide channel based on a predefined rule. In one embodiment, the feedback information is embedded within an ACK/BA frame or is carried in a frame immediately subsequent to the ACK/BA frame.

Abstract translation: 提供OFDMA系统中子信道反馈的方法。 无线接收设备（STA）通过OFDMA系统中的宽信道从发射设备（AP）接收无线电信号。 无线电信号通过宽信道的多个子信道发送。 STA基于每个子信道的接收到的无线电信号来估计信道质量信息。 然后，STA向发送设备发送反馈信息。 基于预定义规则，反馈信息包括来自宽信道的子信道的选定子集的估计信道质量信息。 在一个实施例中，反馈信息被嵌入到ACK / BA帧内，或者紧接在ACK / BA帧之后的帧中被携带。