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    Fixed wireless loop system having adaptive system capacity based on estimated signal to noise ratio
    1.
    发明授权
    Fixed wireless loop system having adaptive system capacity based on estimated signal to noise ratio 失效
    基于估计信噪比的具有自适应系统容量的固定无线环路系统

    公开(公告)号：US6061339A

    公开(公告)日：2000-05-09

    申请号：US988074

    申请日：1997-12-10

    申请人： Leon L Nieczyporowicz ,  Thomas R Giallorenzi ,  Philip L Stephenson ,  Randal R Sylvester

    发明人： Leon L Nieczyporowicz ,  Thomas R Giallorenzi ,  Philip L Stephenson ,  Randal R Sylvester

    IPC分类号： H04B17/00 ,  H04B7/216 ,  H04Q7/00

    CPC分类号： H04B17/336

    摘要： A method is disclosed for operating a fixed wireless system having a radio base unit (RBU) that uses a code division multiple access (CDMA) airlink for communicating with a plurality of subscriber units (SUs). The method includes steps of (a) estimating a signal to noise ratio (SNR) of the FWS; (b) comparing the estimated SNR to a threshold SNR value; and (c) one of allowing service to another SU or not allowing service to another SU based on the result of the step of comparing. The step of estimating preferably uses a normalized SNR, and further employs the use of a null PN code detection technique. More particularly, the step of estimating determines a normalized signal to noise ratio given by Eb/No=20 log (SUT/MUT)-xdB, wherein SUT represents a single user test measurement, wherein MUT represents a multiple user test measurement, and wherein xdB is an adjustment factor. Other types of CDMA systems may also use this technique.

    摘要翻译： 公开了一种用于操作具有无线电基站单元（RBU）的固定无线系统的方法，其使用码分多址（CDMA）空中链路来与多个用户单元（SU）进行通信。 该方法包括以下步骤：（a）估计FWS的信噪比（SNR）; （b）将估计的SNR与阈值SNR值进行比较; 以及（c）基于比较步骤的结果，允许对另一个SU的服务或不允许服务于另一个SU的一个。 估计的步骤优选地使用归一化的SNR，并且还采用空PN码检测技术的使用。 更具体地，估计步骤确定由Eb / No = 20log（SUT / MUT）-xdB给出的归一化信噪比，其中SUT表示单用户测试测量，其中MUT表示多用户测试测量，并且其中 xdB是一个调整因子。 其他类型的CDMA系统也可以使用这种技术。

    Fixed wireless loop system that ranks non-assigned PN codes to reduce interference
    2.
    发明授权
    Fixed wireless loop system that ranks non-assigned PN codes to reduce interference 失效
    固定无线环路系统，排列未分配的PN码以减少干扰

    公开(公告)号：US6023462A

    公开(公告)日：2000-02-08

    申请号：US988413

    申请日：1997-12-10

    申请人： Leon L Nieczyporowicz ,  Philip L Stephenson ,  Thomas R Giallorenzi ,  Robert W Steagall

    发明人： Leon L Nieczyporowicz ,  Philip L Stephenson ,  Thomas R Giallorenzi ,  Robert W Steagall

    IPC分类号： H04J13/16 ,  H04M1/725 ,  H04W84/14 ,  H04B7/216 ,  H04J13/02

    CPC分类号： H04J13/16 ,  H04M1/72502 ,  H04W84/14

    摘要： Disclosed is a method for operating a fixed wireless system (FWS) having a radio base unit (RBU) that uses a code division multiple access (CDMA) airlink for communicating with a plurality of subscriber units (SUs) within a coverage area of the RBU. The method includes establishing, from a set of pseudonoise (PN) spreading codes, a subset of PN spreading codes that are currently assigned to SUs and a subset of PN spreading codes that are currently not assigned to SUs. The method further ranks the PN spreading codes from the subset of non-assigned PN spreading codes by an amount of interference experienced by the use of each non-assigned PN spreading code, and assigns to an SU requiring a PN spreading code a PN spreading code from the set of non-assigned PN spreading codes that is ranked as having a least amount of interference. The step of ranking the non-assigned PN spreading codes is preferably performed periodically, and includes the steps of assigning, in turn, individual ones of the PN spreading codes from the set of non-assigned PN spreading codes to a correlator of the RBU, and determining an amount of noise output from the correlator resulting from the use of the PN spreading code.

    摘要翻译： 公开了一种用于操作具有无线电基站单元（RBU）的固定无线系统（FWS）的方法，该无线电基站单元（RBU）使用码分多址（CDMA）空中链路来与RBU的覆盖区域内的多个用户单元（SU）进行通信 。 该方法包括从一组伪噪声（PN）扩展码建立当前分配给SU的PN扩展码的子集和当前未分配给SU的PN扩展码的子集。 该方法将PN扩展码从未分配的PN扩展码的子集排列为使用每个未分配的PN扩展码所经历的干扰量，并且分配给需要PN扩展码的PN扩频码 从被排列为具有最小干扰量的未分配PN扩展码的集合。 对未分配的PN扩展码进行排序的步骤优选地周期性地进行，并且包括以下步骤：将PN扩展码中的各个PN扩展码从所述一组未分配的PN扩展码分配给所述RBU的相关器， 以及确定从使用PN扩展码产生的相关器输出的噪声量。