System and method for PN correlation and symbol synchronization
    22.
    发明授权
    System and method for PN correlation and symbol synchronization 有权
    用于PN相关和符号同步的系统和方法

    公开(公告)号:US07522653B2

    公开(公告)日:2009-04-21

    申请号:US11046361

    申请日:2005-01-27

    IPC分类号: H04B1/00

    CPC分类号: H04B1/7077

    摘要: A method is disclosed for PN correlation and symbol synchronization of a spread spectrum signal at a receiver when a symbol boundary of the spread spectrum signal is not on a PN epoch or is otherwise unknown. The method includes the operation of modulating the spread spectrum signal with a PN code to form a potentially despread signal. The potentially despread signal can be integrated for a plurality of symbol times at a rate of N integrations per symbol time to form N symbol energies per symbol for a plurality of symbols. Each of the N symbol energies can correspond to a different symbol time hypothesis. The N symbol energies from the plurality of symbols can be added respectively to form N summed symbol time hypotheses. The Nth summed symbol time hypothesis having maximum power can be found. The Nth summed symbol time hypothesis can relate to a location of the symbol boundary.

    摘要翻译: 当扩展频谱信号的符号边界不在PN纪元上时,公开了一种在接收机处的扩频信号的PN相关和符号同步的方法,或者以其他方式未知。 该方法包括利用PN码对扩展频谱信号进行调制以形成潜在的解扩信号。 潜在去扩展信号可以以每个符号时间的N个积分的速率被整合为多个符号时间,以对于多个符号形成每个符号的N个符号能量。 N个符号能量中的每一个可以对应于不同的符号时间假设。 可以分别添加来自多个符号的N个符号能量以形成N个相加的符号时间假设。 可以找到具有最大功率的第N个和符号时间假设。 第N个和符号时间假设可以与符号边界的位置有关。

    Spread spectrum detection system and method
    23.
    发明授权
    Spread spectrum detection system and method 有权
    扩频检测系统及方法

    公开(公告)号:US07634033B1

    公开(公告)日:2009-12-15

    申请号:US11351464

    申请日:2006-02-10

    IPC分类号: H04B1/10

    CPC分类号: H04B1/7075

    摘要: A system and method for detecting a spread spectrum encoded message within a received signal is described. The spread spectrum encoded message has an unknown code phase, unknown code frequency offset, and unknown carrier frequency offset. A plurality of code phase hypotheses, code frequency offset hypotheses, and carrier frequency offset hypotheses are searched in parallel. The unknown code phase, unknown code frequency offset, and unknown carrier frequency offset may also be estimated.

    摘要翻译: 描述了用于在接收信号内检测扩频编码消息的系统和方法。 扩频编码消息具有未知码相位,未知码频率偏移和未知载波频率偏移。 并行搜索多个码相位假设,码频偏置假设和载波频偏估计。 还可以估计未知码相位,未知码频率偏移和未知载波频率偏移。

    Sub-sequence accumulation filter and method
    24.
    发明授权
    Sub-sequence accumulation filter and method 有权
    子序累积滤波器和方法

    公开(公告)号:US07606292B1

    公开(公告)日:2009-10-20

    申请号:US11136782

    申请日:2005-05-24

    IPC分类号: H04L5/12

    摘要: A parallel correlator and method includes temporarily storing in a series of P sequence registers, each of length R1, serial bit-sequences of a code of length N=P*R1. In a first-level of processing, certain unique bit sequences are inverted to reduce the number of unique bit sequences by half. Identical bit-sequences are then combined and temporarily stored in a first-level sub-accumulation register. Alternatively, bit sequences differing by only one bit may be combined in a common first-level sub-accumulation register. Further levels of similar processing may be imposed, where each subsequent level taps and inverts only a portion of the bits in the above level of processing, thereby reducing the number of unique bit sequences. Finally, all negative energy is combined in one register position, inverted, and added to all positive energy in the other register positions. When the spreading code was aligned among the series of sequence registers, the energy is added coherently and an energy peak is output, indicating alignment of the spreading code in the sequence registers.

    摘要翻译: 并行相关器和方法包括临时存储长度为R1,长度为N = P * R1的码的串行比特序列的一系列P序列寄存器。 在第一级处理中,某些唯一的比特序列被反转以将唯一比特序列的数量减少一半。 然后将相同的比特序列组合并临时存储在第一级子累加寄存器中。 或者,只有一位不同的比特序列可以组合在公共的第一级子累加寄存器中。 可以施加更多级别的类似处理,其中每个后续级别在上述处理级别中仅抽头并反转一部分位,由此减少唯一位序列的数量。 最后,所有负能量组合在一个寄存器位置,反相,并加到其他寄存器位置的所有正能量上。 当扩展码在一系列序列寄存器中对齐时,相干地加入能量,并输出能量峰值,指示序列寄存器中扩展码的对齐。

    Phase error detector using I/Q interference cancellation
    25.
    发明授权
    Phase error detector using I/Q interference cancellation 有权
    使用I / Q干扰消除的相位误差检测器

    公开(公告)号:US07369606B1

    公开(公告)日:2008-05-06

    申请号:US10783048

    申请日:2004-02-19

    IPC分类号: H04B3/46

    摘要: A method is presented for estimating a phase error for first (rI) and second (rQ) orthogonal signal components spread respectively by different first cI and second cQ spreading codes. A cross-despread value IdQ and/or QdI is determined by despreading one signal component with the spreading codes associated with the other signal component (rI with cQ or rQ with cI). In parallel, the same signal component is also despread with its associated spreading code to determine an estimated data symbol for that component. An interference of Q into I or I into Q is calculated and multiplied by the estimated data symbol, and subtracted from the cross-despread value to achieve an estimate of phase error. Preferably, both cross-despread values are obtained, normalized to a common data rate, scaled to maximize signal to noise ratio, and combined into one phase error estimate. A phase error detector includes despreaders, multipliers, and adders to determine the cross-despread value and subtract the interference from it.

    摘要翻译: 提出了一种用于估计分别通过不同的第一(i)和(i)个正交信号分量传播的第一(r)I / Q)正交信号分量的相位误差的方法, SUB>和第二个C< Q>扩展码。 通过使用与另一个信号分量相关联的扩展码来解扩一个信号分量来确定交叉解扩值IdQ和/或QdI,其中,具有与其他信号分量相关联的扩展码(r 其中C 1和Q 3与C 1 H 3)。 并行地,相同的信号分量也用其相关联的扩展码进行解扩,以确定该分量的估计数据符号。 计算Q到I或I中的Q到Q的干扰,并将其乘以估计的数据符号,并从交叉解扩值中减去以实现相位误差的估计。 优选地,获得两个交叉解扩值,被归一化为公共数据速率,被缩放以最大化信噪比,并且被组合成一个相位误差估计。 相位误差检测器包括解扩器,乘法器和加法器,以确定交叉解扩值并从其中减去干扰。