公开(公告)号：GB2404797A

公开(公告)日：2005-02-09

申请号：GB0318612

申请日：2003-08-08

Applicant: MOTOROLA INC

Inventor： FRIEDLANDER HAIM ,  LUZZATTO ARIEL ,  SCHWARTZMAN ZALMAN ,  SHIRAZI GADI

IPC: H04B1/40 ,  H04B1/48 ,  H02H1/04 ,  H02H9/04

Abstract: An antenna switch circuit 300 for use in an RF transceiver is connected to a transmitter circuit 103, a receiver circuit 102, and an antenna 101. The switch circuit 300 selectively connects the transmitter 103 and the receiver 102 circuits to the antenna 101. Electrically-controlled devices, such as PIN diodes D1-4, are arranged to perform the switching and to prevent electrostatic discharges of either positive or negative polarity from reaching the transmitter 103 or receiver 102 circuits. Two pairs of PIN diodes D1,3, D2,4 may each be connected so that they have opposed unipolar conductivities. A dc voltage may be applied through an RF-isolating component RFC1, 2 to control the electronically-controlled devices D1-4. The antenna switch circuit 300 may be included in an RF communications apparatus, such as a mobile or fixed radio terminal, or in mobile telephones, mobile radios, or data communications terminals. In a further embodiment the antenna switch circuit may also protect from excessive RF power entering the antenna.

公开(公告)号：WO2005107076B1

公开(公告)日：2006-02-23

申请号：PCT/US2005013207

申请日：2005-04-19

Applicant: MOTOROLA INC ,  LUZZATTO ARIEL ,  FRIEDLANDER HAIM ,  SHIRAZI GADI

Inventor： LUZZATTO ARIEL ,  FRIEDLANDER HAIM ,  SHIRAZI GADI

IPC: H03L7/087 ,  H03L7/113 ,  H03L7/18 ,  H03L7/185 ,  H03L7/20

CPC classification number: H03L7/185 ,  H03L2207/12

Abstract: A frequency synthesiser circuit for use in wireless communications including a phase locked loop including a VCO (voltage controlled oscillator), wherein the synthesiser circuit includes a further oscillator which in operation is a free running oscillator at a frequency higher than the VCO and a mixer connected to receive input signals from the VCO and from the further oscillator and to combine such signals. Also described is a wireless communications transmitter or receiver incorporating the frequency synthesiser circuit.

Abstract translation: 一种用于包括VCO（压控振荡器）的锁相环的无线通信的频率合成器电路，其中所述合成器电路包括另外的振荡器，所述振荡器在高于VCO的频率下是自由振荡器，并且混频器连接 以从VCO和另外的振荡器接收输入信号并组合这样的信号。 还描述了包含频率合成器电路的无线通信发射机或接收机。

公开(公告)号：WO2005020600A3

公开(公告)日：2005-04-28

申请号：PCT/EP2004051289

申请日：2004-06-29

Applicant: MOTOROLA INC ,  LUZZATTO ARIEL ,  SERFATY SALOMON ,  MOTOROLA LTD

Inventor： LUZZATTO ARIEL ,  SERFATY SALOMON

IPC: A63F13/12 ,  G01S1/02 ,  G01S5/14 ,  G01S11/02 ,  G01S11/06 ,  H04L27/26 ,  H04L29/06

CPC classification number: H04L27/2601 ,  G01S1/026 ,  G01S5/14 ,  G01S11/02 ,  G01S11/06

Abstract: A method of estimating the distance between a first wireless communication terminal and a second wireless communication terminal includes: (i) receiving at the first terminal a received signal comprising a composite multipath derivative of a RF transmission signal transmitted by a second terminal which transmission signal comprises an OFDM signal; and (ii) processing the received signal including performing a demodulation operation to produce a demodulated signal; and characterised by: (iii) resolving the demodulated signal into a plurality of components corresponding to different path length components included in the received signal; (iv) identifying which of the resolved components corresponds to a shortest path length; and (v) for the identified component, computing a time of travel from the second terminal to the first terminal. the first terminal may be operable to determine a strength value for each of the resolved components. The strength value may be compared with a threshold value to determine if the strength value is to be considered as non-zero, whereby the component having that strength value is to be included to find the component having the shortest path length. Also described is a terminal which operates to carry out these steps and a method of transmitting and receiving an OFDM signal which includes these steps. The transmitted signal which is transmitted by the second terminal and received in a multipath derivative form by the first terminal may conveniently be the PLCP (Physical Layer Convergence Procedure) Training Signal defined in the 802.11 standard. This is the 'Long Training Sequence' normally provided at the beginning of a transmission by a terminal in a LAN (e.g. a RU). The purpose of this signal is to allow another terminal (e.g. an AP) to synchronize with the terminal.

Abstract translation: 一种估计第一无线通信终端和第二无线通信终端之间的距离的方法包括：（i）在第一终端接收包括由第二终端发送的RF发送信号的复合多径导数的接收信号，该发送信号包括 OFDM信号; 和（ii）处理所接收的信号，包括执行解调操作以产生解调信号; 并且其特征在于：（iii）将解调信号分解成与包括在接收信号中的不同路径长度分量对应的多个分量; （iv）识别哪些解决的组件对应于最短路径长度; 和（v）对于所识别的组件，计算从第二终端到第一终端的行进时间。 第一终端可操作以确定每个解析出的分量的强度值。 强度值可以与阈值进行比较以确定强度值是否被视为非零，由此具有该强度值的分量将被包括以找到具有最短路径长度的分量。 还描述了用于执行这些步骤的终端以及发送和接收包括这些步骤的OFDM信号的方法。 由第二终端发送并且由第一终端以多径导数形式接收的发送信号可以方便地为802.11标准中定义的PLCP（物理层会聚程序）训练信号。 这是通常在LAN（例如RU）中的终端发送开始时提供的“长训练序列”。 该信号的目的是允许另一个终端（例如AP）与该终端同步。