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    • 4. 发明授权
    • System and method for narrowing the range of frequency uncertainty of a doppler shifted signal
    • 用于缩小多普勒偏移信号的频率不确定度范围的系统和方法
    • US06249539B1
    • 2001-06-19
    • US09097842
    • 1998-06-15
    • Brian HarmsSherman A. GregoryBrian K. ButlerAvneesh Agrawal
    • Brian HarmsSherman A. GregoryBrian K. ButlerAvneesh Agrawal
    • H04B1500
    • H04B7/216G01S19/29H04B1/707H04L2027/0034
    • A system and method for narrowing the range of frequency uncertainty of a Doppler shifted pilot signal in a satellite or other communications system with relative signal source and receiver motion. The satellite communications system includes a user terminal (for example, a mobile wireless telephone), a gateway (terrestrial base station), and at least one satellite with unknown position and unknown relative velocity. The method includes the steps of shifting the pilot signal over a plurality of frequency hypotheses, coherently accumulating samples of the pilot signal over a plurality of chips, measuring the energy of the accumulated pilot signal samples, accumulating the energy measurements over a plurality of chips to produce an energy accumulation value, and determining which of the plurality of frequency hypotheses results in the highest energy accumulation value.
    • 一种用于在具有相对信号源和接收机运动的卫星或其他通信系统中缩小多普勒频移导频信号的频率不确定度的范围的系统和方法。 卫星通信系统包括用户终端(例如,移动无线电话),网关(地面基站)和至少一个具有未知位置和未知相对速度的卫星。 该方法包括以下步骤:通过多个频率假设移位导频信号,通过多个码片相干累加导频信号的采样,测量累积的导频信号样本的能量,将多个码片上的能量测量累积到 产生能量累积值,并且确定多个频率假设中的哪一个导致最高的能量积累值。
    • 7. 发明授权
    • Signal acquisition in a multi-user communication system using multiple
walsh channels
    • 使用多个沃尔什通道的多用户通信系统中的信号采集
    • US5577025A
    • 1996-11-19
    • US497240
    • 1995-06-30
    • Gordon Skinner, deceasedBrian Harms
    • Gordon Skinner, deceasedBrian Harms
    • H04L27/32B60R11/00B60R11/02B60R11/04H04B1/7075H04B1/7077H04J13/02H04J3/06
    • H04B1/70775B60R11/04B60R11/02B60R2011/0035B60R2011/0059B60R2011/0075H04B1/70752H04B1/70755
    • A technique for using energy received by subscriber units over multiple orthogonal channels within a spread spectrum communication system to acquire signal timing by controlling signal amplitude integration intervals used in detecting such timing. Received signals are despread and respective amplitudes integrated over periods that are divisible by factors of 2 into the length of Walsh functions used to generate orthogonal signal channels. Non-coherent combinations of the results of this integration are subsequently formed over periods that commence and terminate on Walsh function boundaries, and used to determine when a correct time offset has been selected for despreading signals. Additional advantages are realized by assigning signals that consistently provide a higher energy content such as paging, synchronization, and most frequently assigned traffic channels to specific orthogonal channels within the communication system. In exemplary embodiments, Walsh functions of length 128 are used as channelizing codes and a pilot signal is assigned to channel 0. This results in traffic channels or paging and synchronization functions being assigned to channel 64 when the integration periods are 64 chips long, and to channels 32, 64, and 96 when the periods are 32 chips long. In this manner, additional energy is available during the integration process for use in determining when correct signal acquisition timing offsets have been selected, without the use of additional hardware.
    • 一种用于在扩频通信系统内的多个正交信道上使用由用户单元接收的能量的技术,用于通过控制在检测这种定时中使用的信号幅度积分间隔来获取信号定时。 接收信号被去扩展,并且各个幅度在可被因子2整除为用于产生正交信号信道的沃尔什函数的长度的周期上被积分。 随后在沃尔什函数边界开始和终止的周期形成该积分结果的非相干组合,并用于确定何时为解扩信号选择正确的时间偏移。 额外的优点是通过分配一致地向通信系统内的特定正交信道提供诸如寻呼,同步和最频繁分配的业务信道的更高能量内容的信号来实现。 在示例性实施例中,使用长度为128的沃尔什函数作为信道化码,并且将导频信号分配给信道0.这导致当积分周期为64码长时分配给信道64的业务信道或寻呼和同步功能, 通道32,64和96当这些周期是32码长时。 以这种方式,在集成过程期间可以使用额外的能量,以用于确定何时选择正确的信号采集定时偏移,而不需要使用额外的硬件。