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    • 1. 发明申请
    • Channel estimation method and apparatus for long range signals in bluetooth
    • 用于蓝牙长距离信号的信道估计方法和装置
    • US20090116567A1
    • 2009-05-07
    • US11979687
    • 2007-11-07
    • Albert ChenKuang-Ping Ma
    • Albert ChenKuang-Ping Ma
    • H04L27/28
    • H04L25/0228H04L25/0212H04L25/022
    • The present invention discloses a channel estimation method for Bluetooth signals through a multipath propagation channel, using a SYNC sequence as a preamble sequence. It mainly comprises the steps of: use of SYNC sequence as input to LS-based channel impulse response estimation, precomputation of local frequency domain preamble, precomputation of local inverted frequency domain preamble and shortening of estimated channel impulse response for further equalization purposes. The proposed channel estimation method and apparatus according to the present invention enables use of efficient equalization algorithms, therefore mitigating ISI and very successfully estimates propagation conditions while being very implementation-friendly.
    • 本发明公开了一种使用SYNC序列作为前导序列的通过多径传播信道的蓝牙信号的信道估计方法。 它主要包括以下步骤:使用SYNC序列作为基于LS的信道脉冲响应估计的输入,本地频域前导码的预计算,本地反向频域前导码的预计算和用于进一步均衡的缩短估计的信道脉冲响应。 根据本发明的所提出的信道估计方法和装置使得能够使用有效的均衡算法,从而减轻ISI并且非常成功地估计传播条件,同时非常实现友好。
    • 4. 发明申请
    • Bandpass amplifier
    • 带通放大器
    • US20060001492A1
    • 2006-01-05
    • US10882215
    • 2004-07-02
    • Sheng ChangJia ChenCherng LiuHung ChenShu TangAlbert Chen
    • Sheng ChangJia ChenCherng LiuHung ChenShu TangAlbert Chen
    • H03F3/191
    • H03F3/191H03F2200/147H03F2200/222H03F2200/372
    • The present invention discloses a bandpass amplifier having gain and bandpass performance. The bandpass amplifier includes an input match unit for matching the gain of the amplifier and having a first filter response; a first bias unit electrically connected to the input match unit for driving the first terminal of the amplifier and having a first high pass filter response; a gain stage electrically connected to the first bias unit for providing the flat gain of the amplifier; a second bias unit electrically connected to the gain stage for driving the second terminal of the amplifier and having a second high pass filter response; and an output match unit electrically connected to the second bias unit for matching the gain of the amplifier and having a second filter response.
    • 本发明公开了具有增益和带通性能的带通放大器。 带通放大器包括用于匹配放大器的增益并具有第一滤波器响应的输入匹配单元; 电连接到输入匹配单元的第一偏置单元,用于驱动放大器的第一端并具有第一高通滤波器响应; 增益级,电连接到第一偏置单元,用于提供放大器的平坦增益; 电连接到增益级的第二偏置单元,用于驱动放大器的第二端并具有第二高通滤波器响应; 以及输出匹配单元,电连接到第二偏置单元,用于匹配放大器的增益并具有第二滤波器响应。
    • 10. 发明授权
    • Antenna diversity switch of wireless dual-mode co-existence systems
    • 无线双模共存系统的天线分集开关
    • US07505790B2
    • 2009-03-17
    • US11145943
    • 2005-06-07
    • Sheng-Fuh ChangWen-Lin ChenYi-Yu LuHung-Cheng ChenShu-Fen TangAlbert Chen
    • Sheng-Fuh ChangWen-Lin ChenYi-Yu LuHung-Cheng ChenShu-Fen TangAlbert Chen
    • H04B1/38H04M1/00
    • H04B1/48
    • The present invention discloses an antenna diversity switch, used for receiving and transmitting RF signals for dual-mode co-existence wireless communication system. The antenna diversity switch comprises a first transmitting port; a second transmitting port; a receiving port; a first control unit, electrically connected between the first transmitting port and a first antenna; a second control unit, electrically connected between the first transmitting port and a second antenna; a third control unit, electrically connected between the second transmitting port and the first antenna; a forth control unit, electrically connected between the second transmitting port and the second antenna; a fifth control unit, electrically connected between the receiving port and the first antenna; a sixth control unit, electrically connected between the receiving port and the second antenna. The antenna diversity switch according to the present invention meets the requirement of IEEE 802.11b/g WLAN and Bluetooth co-existence operation with reduction of three or four antennas in the prior art to two antennas. Moreover, it provides antenna diversity for both WLAN and Bluetooth systems, where in the prior-art WLAN and Bluetooth co-existence system only WLAN system has the antenna diversity.
    • 本发明公开了一种用于接收和发送用于双模共存无线通信系统的RF信号的天线分集开关。 天线分集开关包括第一发射端口; 第二个发送端口; 接收端口 第一控制单元,电连接在第一发送端口和第一天线之间; 第二控制单元,电连接在第一发送端口和第二天线之间; 第三控制单元,电连接在第二发送端口和第一天线之间; 第四控制单元,电连接在第二发送端口和第二天线之间; 电连接在所述接收端口和所述第一天线之间的第五控制单元; 电连接在接收端口和第二天线之间的第六控制单元。 根据本发明的天线分集交换机通过将现有技术中的三个或四个天线减少到两个天线来满足IEEE 802.11b / g WLAN和蓝牙共存操作的要求。 此外,它为WLAN和蓝牙系统提供天线分集,其中在现有技术的WLAN和蓝牙共存系统中,只有WLAN系统具有天线分集。