公开(公告)号：CA2305718A1

公开(公告)日：1999-04-22

申请号：CA2305718

申请日：1998-10-09

Applicant: QUALCOMM INC

Inventor： SKINNER GORDON ,  BUTLER BRIAN ,  HARMS BRIAN

IPC: H04J13/12 ,  H04B1/707 ,  H04B1/7075 ,  H04B1/7077 ,  H04B7/216 ,  H04J13/00

Abstract: A technique for spreading information signals in a spread spectrum communication system to provide increased signal acquisition speed. A first PN spreading code or code set is used to spread information signals along with a second PN spreading code sequence or function. The second PN code is synchronized with the first PN spreading code, but has a larger code period so that each code chip of the second PN code extends over the entire period of the first PN code. The longer period spreading code forms an outer code which helps provide unambiguous beam identification and easily acquired frame timing in the presence of dynamically changing signal path delay, improving signal acquisition.

公开(公告)号：WO0141386A8

公开(公告)日：2001-11-08

申请号：PCT/US0032518

申请日：2000-11-29

Applicant: QUALCOMM INC

Inventor： MOHSENI MOHAMMAD JAFAR ,  BUTLER BRIAN ,  JOHN DEEPU ,  ZHANG HAITAO

IPC: H04L27/22 ,  H04J13/04 ,  H04L27/18 ,  H04L27/36

CPC classification number: H04L27/206 ,  H04L27/2082

Abstract: In applications employing phase-shift keying modulation, a phase rotator (200, 202) as disclosed herein is used to rotate the constellation of signal vectors before carrier modulation in order to maximize modulator output power. Such a rotator (200, 202) may be applied in the digital domain (to complex signals having either binary-valued or multi-valued components) or in the analog domain.

Abstract translation: 在采用相移键控调制的应用中，如本文所公开的相位旋转器（200,202）用于在载波调制之前旋转信号矢量的星座以便最大化调制器输出功率。 这样的旋转器（200,202）可以应用于数字域（以复杂具有二值或多值分量的信号）或在模拟域中。

公开(公告)号：WO02061963A3

公开(公告)日：2002-09-19

申请号：PCT/US0200682

申请日：2002-01-11

Applicant: QUALCOMM INC

Inventor： RICK ROLAND ,  SUBRAHMANYA PARVATHANATHAN ,  BUTLER BRIAN ,  PATEL SHIMMAN ,  EKVETCHAVAT THUNACHATE

IPC: H04B7/06 ,  H04B7/08 ,  H04B1/707

CPC classification number: H04B1/7085 ,  H04B1/7115 ,  H04B7/0667 ,  H04B7/0697 ,  H04B2201/70701

Abstract: In an antenna diverstiy environment, the timing offset of the receiver's fingers are based on the timing offset of the received peaks of the base station transmit signals. In a system with non-neglible multipath spacing, the timing offset of the received peaks of the base station transmit signals are not necessarily at the same location. In one embodiment, the demodulating elements for the signal from each base station antenna use the same offset for demodulating and determining an error signal based on pilot signal sampling prior to the timing offset and subsequent to the timing offset. The error signals are averaged and used by a time trackin loop to track the incoming signal. In another embodiment, the demodulating elements for the signal from each base station antenna independently time track the signals with different times offsets for each finger. The preferred embodiment depends on the method used by the base station to multiplex the data onto multiple transmit antennas.

Abstract translation: 在天线多样化环境中，接收机手指的定时偏移基于接收到的基站发射信号峰值的定时偏移。 在具有不可忽略的多路径间隔的系统中，基站发射信号的接收峰值的定时偏移不一定在相同位置。 在一个实施例中，来自每个基站天线的信号的解调单元使用相同的偏移来基于定时偏移之前和定时偏移之后的导频信号采样来解调和确定误差信号。 误差信号被平均并由时间跟踪环路用于跟踪输入信号。 在另一个实施例中，来自每个基站天线的信号的解调单元独立地时间跟踪每个手指具有不同时间偏移的信号。 该优选实施例取决于基站用于将数据复用到多个发射天线上的方法。

公开(公告)号：WO0159937A2

公开(公告)日：2001-08-16

申请号：PCT/US0102747

申请日：2001-01-26

Applicant: QUALCOMM INC

Inventor： AGRAWAL AVNEESH ,  SIH GILBERT ,  ROH MARK ,  BUTLER BRIAN ,  CHALLA RAGHU

IPC: H04B1/7087 ,  H04B1/7115 ,  H04B1/7117 ,  H04L27/00 ,  H04B1/00

CPC classification number: H04B1/7087 ,  H04B1/7115 ,  H04B1/7117 ,  H04B2201/70701 ,  H04L27/0014 ,  H04L2027/0032 ,  H04L2027/0057 ,  H04L2027/0087

Abstract: A novel and improved method and apparatus for frequency tracking is described. Two main sources of error that contribute to the frequency difference between locally generated carriers and those used to modulate received signals include frequency offset between the two timing sources and doppler effects due to relative movement between the sources. The present invention provides a tracking mechanism for removing the effects of error due to frequency offset as well as compensation for frequency error due to doppler in a plurality of multipath signals. Each finger (700a..700n) of a RAKE receiver utilizing the present invention will compute a frequency error for that finger. The weighted average of all of these frequency errors is calculated (710) and filtered (720) to provide a control signal for varying the frequency of IF and RF frequency synthesizers, accounting for the common frequency offset seen at each finger. Additionally, each finger is equipped with a rotator (706a...706n) for providing frequency adjustment specific to that finger. The frequency of each finger is adjusted through feedback of the frequency error finger.

Abstract translation: 描述了用于频率跟踪的新颖和改进的方法和装置。 导致本地产生的载波与用于调制接收信号的载波之间的频率差异的两个主要误差源包括两个定时源之间的频率偏移以及由于源之间的相对运动引起的多普勒效应。 本发明提供了一种用于消除由于频率偏移引起的误差的影响的跟踪机制以及由多个多径信号中的多普勒引起的频率误差的补偿。 利用本发明的RAKE接收机的每个手指（700a ... 700n）将计算该手指的频率误差。 计算所有这些频率误差的加权平均值（710）并进行滤波（720）以提供用于改变IF和RF频率合成器的频率的控制信号，从而考虑每个手指处看到的共同频率偏移。 此外，每个手指配备有用于提供特定于该手指的频率调节的旋转器（706a ... 706n）。 每个手指的频率通过频率误差手指的反馈进行调整。