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    Method to indicate synchronization lock of a remote station with a base station for a discrete multitone spread spectrum communications system
    3.
    发明授权
    Method to indicate synchronization lock of a remote station with a base station for a discrete multitone spread spectrum communications system 失效

    公开(公告)号：US6084932A

    公开(公告)日：2000-07-04

    申请号：US095747

    申请日：1998-06-11

    申请人： Gregory J. Veintimilla

    发明人： Gregory J. Veintimilla

    IPC分类号： H04B7/26 ,  H04L5/02 ,  H04L27/26 ,  H04L7/00 ,  H04L7/04

    CPC分类号： H04L5/0026 ,  H04B1/69 ,  H04L27/2613 ,  H04L27/2659 ,  H04L27/266 ,  H04L27/2675 ,  H04L5/0048 ,  H04L27/2662 ,  H04W56/0035 ,  H04W56/0085

    摘要： A method for a wireless discrete multitone spread spectrum communications system, synchronizes the remote station to the base station. The method begins with the step of generating a clock signal at the base station. The base station then derives a synchronization symbol pattern from the base station clock signal and spreads the it with spreading codes that distributes the symbol pattern over a plurality of discrete tones, forming a discrete multitone spread spectrum signal. The base station then transmits the spread signal to the remote station. The remote station generates a first clock signal and samples the discrete tones using the remote station first clock signal, forming a first sampled signal. Then the remote station applies the first sampled signal to a matched filter bank, forming a frequency error signal. The method then adjusts a frequency of the remote station first clock signal using the frequency error signal, forming a second clock signal. Then the remote station samples the discrete tones using the remote station second clock signal, forming a second sampled signal. Then the remote station despreads the second sampled signal with despreading codes to extract the synchronization symbol pattern. Then the remote station compares the extracted synchronization symbol pattern with a reference symbol pattern at the remote station. If the comparing step is successful, then the remote station selectively processes traffic signals received from the base station using the second clock signal. If the comparing step is not successful, then the remote station selectively adjusts a time offset value of the remote station second clock signal forming a third clock signal. The remote station then samples the discrete tones using the remote station third clock signal, forming a third sampled signal. The remote station then despreads the third sampled signal with despreading codes to form a second extraction of the synchronization symbol pattern. The remote station then compares the second extraction of the synchronization symbol pattern with the reference symbol pattern at the remote station. If the step of comparing the second extraction is successful, then the remote station selectively processes traffic signals received from the base station using the third clock signal.

    Non-uniformly spaced tones for synchronization waveform
    7.
    发明授权
    Non-uniformly spaced tones for synchronization waveform 失效
    不均匀间隔的音调用于同步波形

    公开(公告)号：US5896425A

    公开(公告)日：1999-04-20

    申请号：US803833

    申请日：1997-02-24

    申请人： Michael Hirano ,  Gregory J. Veintimilla

    发明人： Michael Hirano ,  Gregory J. Veintimilla

    IPC分类号： H04L5/02 ,  H04L27/26 ,  H04L7/00 ,  H04L27/30

    CPC分类号： H04L5/0016 ,  H04L27/2613 ,  H04L27/2657 ,  H04L27/2662 ,  H04L27/2675 ,  H04L5/0048

    摘要： A method synchronizes a remote unit to a base station in a bandwidth efficient communication system and includes generating a clock signal at the base station. The clock signal is spread over a plurality of non-uniformly spaced discrete tones, thus creating a synchronization signal at the base station, which is transmitted from the base station and received at least one remote unit. Matched filtering is performed on the synchronization signal at the remote unit and the remote unit generates a remote clock signal synchronized with the synchronization signal, based on the matched filter output.

    摘要翻译： 一种方法在远程单元与带宽高效通信系统中的基站同步，并且包括在基站处生成时钟信号。 时钟信号分散在多个不均匀的离散音调上，从而在基站处产生同步信号，该信号从基站发送并接收至少一个远程单元。 对远程单元的同步信号执行匹配滤波，远程单元根据匹配的滤波器输出产生与同步信号同步的远程时钟信号。

    Method to indicate synchronization lock of a remote station with a base station
    10.
    发明授权
    Method to indicate synchronization lock of a remote station with a base station 失效

    公开(公告)号：US5943375A

    公开(公告)日：1999-08-24

    申请号：US796492

    申请日：1997-02-06

    申请人： Gregory J. Veintimilla

    发明人： Gregory J. Veintimilla

    IPC分类号： H04B1/69 ,  H04B7/26 ,  H04L5/02 ,  H04L27/26 ,  H04L7/00 ,  H04J3/06 ,  H04L7/06

    CPC分类号： H04L5/0016 ,  H04B1/69 ,  H04L27/2613 ,  H04L27/2659 ,  H04L27/266 ,  H04L27/2675 ,  H04L5/0048 ,  H04W56/0085 ,  H04W92/10

    摘要： A method for a wireless discrete tone communications system, synchronizes the remote station to the base station. The method begins with the step of generating a clock signal at the base station. The base station then derives a synchronization symbol pattern from the base station clock signal and spreads the it with spreading codes that distributes the symbol pattern over a plurality of discrete tones, forming a discrete tone signal. The base station then transmits the spread signal to the remote station. The remote station generates a first clock signal and samples the discrete tones using the remote station first clock signal, forming a first sampled signal. Then the remote station applies the first sampled signal to a matched filter bank, forming a frequency error signal. The method then adjusts a frequency of the remote station first clock signal using the frequency error signal, forming a second clock signal. Then the remote station samples the discrete tones using the remote station second clock signal, forming a second sampled signal. Then the remote station despreads the second sampled signal with despreading codes to extract the synchronization symbol pattern. Then the remote station compares the extracted synchronization symbol pattern with a reference symbol pattern at the remote station. If the comparing step is successful, then the remote station selectively processes traffic signals received from the base station using the second clock signal. If the comparing step is not successful, then the remote station selectively adjusts a time offset value of the remote station second clock signal forming a third clock signal. The remote station then samples the discrete tones using the remote station third clock signal, forming a third sampled signal. The remote station then despreads the third sampled signal with despreading codes to form a second extraction of the synchronization symbol pattern. The remote station then compares the second extraction of the synchronization symbol pattern with the reference symbol pattern at the remote station. If the step of comparing the second extraction is successful, then the remote station selectively processes traffic signals received from the base station using the third clock signal.