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。

公开(公告)号：US5903551A

公开(公告)日：1999-05-11

申请号：US5938

申请日：1998-01-12

申请人： Samuel C Kingston ,  Thomas R. Giallorenzi ,  Randal R Sylvester ,  David W Matolak ,  Patrick J Smith

发明人： Samuel C Kingston ,  Thomas R. Giallorenzi ,  Randal R Sylvester ,  David W Matolak ,  Patrick J Smith

IPC分类号： H04B1/7075 ,  H04B1/7103 ,  H04B7/24 ,  H04B7/26 ,  H04B7/216

CPC分类号： H04B1/70755 ,  H04B1/70753 ,  H04B1/7103 ,  H04B2201/709709

摘要： Disclosed are methods for acquiring a forward channel in a point-to-multipoint CDMA system. One method includes the steps of (a) despreading a received CDMA signal with a first pn code that is known to be present in the received CDMA signal and obtaining a first measure of received signal level; (b) despreading the received CDMA signal with a second pn code that is known not to be present in the received CDMA signal and obtaining a second measure of received signal level; and (c) synchronizing to a desired channel using a difference between the first and second signal levels. In this method the first step of despreading despreads a continuously transmitted side-channel, and the step of synchronizing synchronizes to the side-channel. Also, the step of obtaining a first measure of received signal level obtains a correlation peak, and the step of obtaining a second measure of received signal level obtains a correlation null. Preferably, the steps of despreading and obtaining are accomplished iteratively over a range of n first pn code phase states and over a range of n second pn code phase states.

摘要翻译： 公开了用于在点对多点CDMA系统中获取前向信道的方法。 一种方法包括以下步骤：（a）使用已知存在于所接收的CDMA信号中的第一pn码解扩接收的CDMA信号，并获得接收信号电平的第一测量值; （b）用已知不存在于所接收的CDMA信号中的第二pn码解扩接收的CDMA信号，并获得接收信号电平的第二测量值; 以及（c）使用第一和第二信号电平之间的差异来同步到期望的信道。 在该方法中，解扩的第一步骤对连续发送的侧信道进行解扩，并且同步步骤与侧信道同步。 此外，获得接收信号电平的第一测量的步骤获得相关峰值，并且获得接收信号电平的第二测量的步骤获得相关无效。 优选地，解扩和获得的步骤在n个第一pn码相位状态的范围内以及在n个第二pn码相位状态的范围上迭代地完成。