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    • 1. 发明授权
    • Method and apparatus for obtaining transmit diversity using switched antennas
    • 使用交换天线获得发射分集的方法和装置
    • US07031398B2
    • 2006-04-18
    • US10913093
    • 2004-08-06
    • Joseph P. OdenwalderStein A. LundbyCharles E. Wheatley, IIIEdward G. Tiedemann, Jr.
    • Joseph P. OdenwalderStein A. LundbyCharles E. Wheatley, IIIEdward G. Tiedemann, Jr.
    • H04B7/02
    • H04L1/0057H04B7/0604H04L1/0061H04L1/0065H04L1/0071H04L1/06
    • A method and apparatus for providing diversity transmissions to a mobile unit from a transmitting station having at least first and second antennas by repeatedly switching between the two antennas during the transmission of information to the receiving unit. Message information is transmitted from the first antenna in the transmitting station to the receiving unit. After the start of the transmission of the message information from the first antenna, transmission of the message information from the first antenna to the receiving unit terminates and transmission of the message information from the second antenna in the transmitting station to the receiving unit is initiated. Some time after transmission of the message information from second antenna is initiated, the transmission of the message information from the second antenna to the receiving unit terminates and transmission of the message information from the first antenna in the transmitting station to the receiving unit is initiated. Repeated switching between the first and second antennas is achieved by repeating the process. The switching results in diversity transmissions that improve the ability of a receiving unit to receive the coded and interleaved transmitted message information from the transmitting station. The interleaver disperses the encoded symbols in each antenna dwell period such that the decoder decisions are based on a mix of symbols form each antenna. Therefore the decoder decisions are unreliable only when the mix of symbols from the different antennas, with different fading characteristics, are unreliable over the span of symbols the decoder uses in its decision process.
    • 一种用于在具有至少第一和第二天线的发射台向移动单元提供分集传输的方法和装置,通过在向接收单元发送信息期间在两个天线之间重复切换。 消息信息从发送站中的第一天线发送到接收单元。 在从第一天线发送消息信息开始之后,消息信息从第一天线到接收单元的传输终止,并且发送消息信息从发送站中的第二天线到接收单元的发送。 开始从第二天线发送消息信息之后的某个时间,消息信息从第二天线到接收单元的传输终止,并且发送消息信息从发送站中的第一天线到接收单元的发送。 通过重复该过程来实现第一和第二天线之间的重复切换。 切换导致分集传输,其提高接收单元从发射台接收编码和交织的传输消息信息的能力。 交织器在每个天线驻留周期中分散编码符号,使得解码器判定基于每个天线的符号混合。 因此,只有当解码器在其决策过程中使用的符号范围内,来自具有不同衰落特性的不同天线的符号混合不可靠时,解码器判决才是不可靠的。
    • 2. 发明授权
    • Method and apparatus for obtaining transmit diversity using switched antennas
    • 使用交换天线获得发射分集的方法和装置
    • US06795508B1
    • 2004-09-21
    • US09114036
    • 1998-07-10
    • Joseph P. OdenwalderStein A. LundbyCharles E. Wheatley, IIIEdward G. Tiedemann, Jr.
    • Joseph P. OdenwalderStein A. LundbyCharles E. Wheatley, IIIEdward G. Tiedemann, Jr.
    • H04B702
    • H04L1/0057H04B7/0604H04L1/0061H04L1/0065H04L1/0068H04L1/0071H04L1/06
    • A method and apparatus for providing diversity transmissions to a mobile unit from a transmitting station having at least first and second antennas by repeatedly switching between the two antennas during the transmission of information to the receiving unit. Message information is transmitted from the first antenna in the transmitting station to the receiving unit. After the start of the transmission of the message information from the first antenna, transmission of the message information from the first antenna to the receiving unit terminates and transmission of the message information from the second antenna in the transmitting station to the receiving unit is initiated. Some time after transmission of the message information from second antenna is initiated, the transmission of the message information from the second antenna to the receiving unit terminates and transmission of the message information from the first antenna in the transmitting station to the receiving unit is initiated. Repeated switching between the first and second antennas is achieved by repeating the process. The switching results in diversity transmissions that improve the ability of a receiving unit to receive the coded and interleaved transmitted message information from the transmitting station. The interleaver disperses the encoded symbols in each antenna dwell period such that the decoder decisions are based on a mix of symbols form each antenna. Therefore the decoder decisions are unreliable only when the mix of symbols from the different antennas, with different fading characteristics, are unreliable over the span of symbols the decoder uses in its decision process.
    • 一种用于在具有至少第一和第二天线的发射台向移动单元提供分集传输的方法和装置,通过在向接收单元发送信息期间在两个天线之间重复切换。 消息信息从发送站中的第一天线发送到接收单元。 在从第一天线发送消息信息开始之后,消息信息从第一天线到接收单元的传输终止,并且发送消息信息从发送站中的第二天线到接收单元的发送。 开始从第二天线发送消息信息之后的某个时间,消息信息从第二天线到接收单元的传输终止,并且发送消息信息从发送站中的第一天线到接收单元的发送。 通过重复该过程来实现第一和第二天线之间的重复切换。 切换导致分集传输,其提高接收单元从发射台接收编码和交织的传输消息信息的能力。 交织器在每个天线驻留周期中分散编码符号,使得解码器判定基于每个天线的符号混合。 因此,只有当解码器在其决策过程中使用的符号范围内,来自具有不同衰落特性的不同天线的符号混合不可靠时,解码器判决才是不可靠的。