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    • 72. 发明授权
    • Preamble formats for MIMO wireless communications
    • 用于MIMO无线通信的前导格式
    • US07991009B2
    • 2011-08-02
    • US12173796
    • 2008-07-15
    • Christopher J. HansenJason A. TrachewskyR. Tushar MoortiMatthew J. FischerChristopher Young
    • Christopher J. HansenJason A. TrachewskyR. Tushar MoortiMatthew J. FischerChristopher Young
    • H04J3/24H04J11/00H04W4/00H03C7/02H04B1/02H04B7/02H04B1/00
    • H04B7/0667
    • A method for generating a preamble of a frame for a multiple input multiple output (MIMO) wireless communication begins by, for each transmit antenna of the MIMO wireless communication, generating a carrier detect field, wherein, from transmit antenna to transmit antenna, the carrier detect field is cyclically shifted. The method continues by, for a first grouping of the transmit antennas of the MIMO wireless communication: generating a first guard interval following the carrier detect field; and generating at least one channel sounding field, wherein, from transmit antenna to transmit antenna in the first grouping, the at least one channel sounding field is cyclically shifted, and wherein the at least one channel sounding field follows the first guard interval. The method continues by, when the MIMO wireless communication includes more than the first grouping of the transmit antennas, for another grouping of the transmit antennas: generating at least one other channel sounding field, wherein, from transmit antenna to transmit antenna in the another grouping, the at least one other channel sounding field is cyclically shifted, and wherein the at least one other channel sounding field follows the at least one channel sounding field; and generating the first guard interval prior to the at least one other channel sounding field.
    • 用于生成多输入多输出(MIMO)无线通信的帧的前同步码的方法,针对MIMO无线通信的每个发射天线开始,生成载波检测场,其中,从发射天线到发射天线,载波 检测场循环移位。 对于MIMO无线通信的发射天线的第一组,该方法继续:产生载波检测域之后的第一保护间隔; 以及产生至少一个信道探测场,其中,从所述第一组中的发射天线到所述发射天线,所述至少一个信道探测场被循环移位,并且其中所述至少一个信道探测场跟随所述第一保护间隔。 当MIMO无线通信包括多于发射天线的第一组合时,该方法继续用于发射天线的另一组:产生至少一个其它信道探测场,其中从另一组中的发射天线到发射天线 ,所述至少一个其它信道探测场被循环移位,并且其中所述至少一个其它信道探测场跟随所述至少一个信道探测场; 以及在所述至少一个其它信道探测场之前产生所述第一保护间隔。
    • 75. 发明授权
    • Channel reciprocity matrix determination in a wireless MIMO communication system
    • 无线MIMO通信系统中的信道互易矩阵确定
    • US07894852B2
    • 2011-02-22
    • US11770975
    • 2007-06-29
    • Christopher J. Hansen
    • Christopher J. Hansen
    • H04M1/00
    • H04L25/0204H04B7/0413H04L1/0025H04L25/0242H04L25/03292H04L27/2601H04L2025/03426H04L2025/03802
    • Operating a wireless MIMO system to determine forward and reverse channel reciprocity matrices relating a first wireless MIMO device and a second wireless MIMO device of the wireless MIMO system includes, during each of a plurality of time intervals, determining a forward composite channel estimates and a reverse composite channel estimates between the first wireless MIMO device and the second wireless MIMO device to yield a plurality of forward composite channel estimates and a plurality of reverse composite channel estimates. Operation continues with creating a mathematical relationship between the plurality of forward composite channel estimates and the plurality of reverse composite channel estimates and the forward and reverse channel reciprocity matrices. Operation concludes with finding a solution to the mathematical relationship between the plurality of forward composite channel estimates and the plurality of reverse composite channel estimates to yield the forward reciprocity matrix and the reverse channel reciprocity matrix.
    • 操作无线MIMO系统以确定与无线MIMO系统的第一无线MIMO设备和第二无线MIMO设备相关的正向和反向信道互易矩阵在多个时间间隔的每一个期间包括确定正向复合信道估计和反向 在第一无线MIMO设备和第二无线MIMO设备之间的复合信道估计,以产生多个正向复合信道估计和多个反向复合信道估计。 操作继续在多个正向复合信道估计和多个反向复合信道估计之间建立数学关系,以及正向和反向信道互易矩阵。 操作的结论是找到多个正向复合信道估计与多个反向复合信道估计之间的数学关系的解,以产生正向互易矩阵和反向信道互易矩阵。