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    • 41. 发明授权
    • Method and apparatus for providing orthogonal spot beams, sectors, and picocells
    • 用于提供正交点波束,扇区和微微小区的方法和装置
    • US06285655B1
    • 2001-09-04
    • US08925521
    • 1997-09-08
    • Stein A. LundbyJoseph P. OdenwalderEdward G. Tiedemann, Jr.
    • Stein A. LundbyJoseph P. OdenwalderEdward G. Tiedemann, Jr.
    • H04J1100
    • H01Q1/246H04B1/707H04B7/2628H04B2201/70701H04J13/0048H04J13/107H04W16/00H04W16/24H04W16/32H04W48/08H04W48/16
    • A method and apparatus for providing orthogonal spot beams, sectors, and picocells. The transmissions can be made orthogonally by using orthogonal auxiliary pilots and different Walsh traffic channels in adjacent areas. In accordance with the IS-95 standard, the pilot signal is covered with the 64-chip Walsh sequence zero. The 64-chip all zeros Walsh sequence can be designated as P and the 64-chip all one sequence can be designated as M. In the present invention, additional pilot signals can be provided by concatenating 64-chip all zeros P and all ones M sequences. Thus, for two pilot signals, pilot Walsh sequences of PP and PM can be used. For four pilot signals, pilot Walsh sequences of PPPP, PMPM, PPMM, and PMMP can be used. The present invention can be extended such that any required number of pilot Walsh sequences can be generated by substituting each bit in an K-bit Walsh sequence with the 64-chip all zeros P or all ones M sequence depending on the value of that bit.
    • 一种用于提供正交点波束,扇区和微微小区的方法和装置。 可以通过在相邻区域中使用正交辅助导频和不同沃尔什交通信道来正交地进行传输。 根据IS-95标准,导频信号被64芯片Walsh序列覆盖。 64位全零的沃尔什序列可以被指定为P,并且64个芯片的所有的一个序列可以被指定为M.在本发明中,可以通过连接64个芯片全零的P和所有的M来提供附加的导频信号 序列。 因此,对于两个导频信号,可以使用PP和PM的导频沃尔什序列。 对于四个导频信号,可以使用PPPP,PMPM,PPMM和PMMP的导频沃尔什序列。 可以扩展本发明,使得可以根据该比特的值,通过用64个码元全零P或全1个序列替换K比特沃尔什序列中的每个比特来产生任何所需数量的导频沃尔什序列。
    • 42. 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。