专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

91. 发明公开

EP1322044A4 METHOD AND APPARATUS FOR DETECTING SPREAD SPECTRUM SIGNAL SPREAD CODE SYNCHRONIZATION 有权
标题翻译：方法和设备检测同步的扩频码扩频信号
公开(公告)号：EP1322044A4
公开(公告)日：2006-05-24
申请号：EP02747690
申请日：2002-07-18
申请人： SONY CORP
发明人： TANAKA KATSUYUKI
IPC分类号： G01S1/00 , H04B1/707 , H04B1/7075 , H04B1/709 , H04L7/00 , H04L25/00 , H04L27/00 , H04W56/00 , H04W64/00 , H04W76/02
CPC分类号： G01S19/30 , H04B1/707 , H04B1/70752
摘要： A spreading-code synchronization detection method for a spectrum spreading signal, which increases the sensitivity of spreading-code synchronization detection. In this method, spreading-code synchronization detection is applied to a spectrum spreading signal obtained by spectrum-spreading data having a bit transition period equal to a multiple of one period of a spreading code with the spreading code. A process for obtaining a liner-addition correlation-calculation result equal to a value obtained by linear additions of the results of correlation calculations between the spectrum spreading signal and the spreading code is performed every unit period which is a multiple of one period of the spreading code and shorter than the bit transition period. The absolute value of the liner-addition correlation-calculation result obtained every unit period is calculated. The absolute value of the liner-addition correlation-calculation result obtained every unit period is added for a plurality of unit periods. A correlation point is detected from a value obtained by adding the absolute values.

92. 发明授权

EP1128565B1 Correlator co-processor for CDMA rake receiver 有权
标题翻译：相关协处理器CDMA RAKE接收机
公开(公告)号：EP1128565B1
公开(公告)日：2006-05-17
申请号：EP01000020.6
申请日：2001-02-19
申请人： TEXAS INSTRUMENTS INCORPORATED
发明人： Brown, Katherine G. , Sriram, Sundararajan , Honore, Francis , Lee, Yuan Kang
IPC分类号： H04B1/707 , G06F17/15 , G06F9/46
CPC分类号： H04B1/7115 , G06F17/15 , H04B1/70752 , H04B1/709 , H04B2001/70706 , H04B2201/70711

93. 发明公开

EP1642152A1 GPS RECEIVER WITH FAST ACQUISITION TIME 有权
标题翻译：短检测GPS接收机
公开(公告)号：EP1642152A1
公开(公告)日：2006-04-05
申请号：EP04741948.6
申请日：2004-07-02
申请人： Nemerix SA
发明人： PIAZZA, Francesco
IPC分类号： G01S1/00 , H04B1/707
CPC分类号： H04B1/70752 , G01S19/29 , G01S19/30 , H04B1/708
摘要： Method for acquiring a plurality of GPS signals, in which the signals received from the space vehicles are correlated, in an array of parallel processing modules (20) with local replicas of a pseudorandom code. The local pseudorandom code generators are slewed periodically, on detection of an external periodical trigger INT-ACC, and the correlation data are dumped simultaneously to all processing modules in output registers for acquisition and tracking software. The integration period is shorter than the natural period of the pseudorandom code sequence, and all the local generators are slewed at the same time, thereby allowing a quicker acquisition of the SV C/A code.

94. 发明公开

EP1421707A4 SPREAD SPECTRUM RECEIVER ARCHITECTURES AND METHODS THEREFOR 审中-公开
标题翻译：扩频接收器架构及其方法
公开(公告)号：EP1421707A4
公开(公告)日：2006-01-11
申请号：EP02752465
申请日：2002-07-19
申请人： MOTOROLA INC
发明人： KING THOMAS MICHAEL , RIEMER DENISE C , HARBOUR ROBERT B , HOOVER ANDREW P
IPC分类号： G01S1/00 , G01S19/24 , G01S19/37 , H04B1/7075 , H04B1/69
CPC分类号： H04B1/70752 , G01S19/29 , G01S19/30 , G01S19/37 , H04B1/70753 , H04B2201/70715
摘要： Methods and architectures for code phase searching spread spectrum signals having a repeating sequence of bits. The signals are searched virtually in parallel by segmenting with a divider (314) received signals by sequentially, partially correlating signal segments with a corresponding replica signal segments for a predetermined number of phase delays during a time interval not greater than that required to form the next signal segment. Multiplexors (322) and (330) provide Doppler and replica signal segments data from Doppler signal and replica signal generators (318) and (320) to corresponding multipliers (326) and (332), respectively, for multiplication with corresponding signal segments in a segment register (316). The partial correlation results for each phase delay and at each Doppler frequency are stored in corresponding memory locations in a coherent accumulation RAM (334). The signals may be searched over one or more phase delays and at one or more Doppler frequencies.

95. 发明公开

EP1552621A1 SYSTEM FOR DIRECT ACQUISITION OF RECEIVED SIGNALS 审中-公开
标题翻译： SYSTEM FOR接收信号的即时识别
公开(公告)号：EP1552621A1
公开(公告)日：2005-07-13
申请号：EP03773208.8
申请日：2003-10-09
申请人： The Mitre Corporation
发明人： BETZ, John , CAPOZZA, Paul , FITE, John
IPC分类号： H04B1/707
CPC分类号： H04B1/70752 , G01S19/30 , H04B1/708 , H04B1/7093
摘要： Signal processing architectures for direct acquisition of spread spectrum signals using long codes. Techniques are described for achieving a high of parallelism, employing code matched filter banks and other hardware sharing. In one embodiment, upper and lower sidebands are treated as two independent signals with identical spreading codes. Cross-correlators, in preferred embodiments, are comprised of a one or more banks of CMFs for computing parallel short-time correlations (STCs) of received signal samples and replica code sequence samples, and a means for calculating the cross-correlation values utilizing discrete-time Fourier analysis of the computed STCs. One or more intermediate quantizers may optionally be disposed between the bank of code matched filters and the cross-correlation calculation means for reducing word-sizes of the STCs prior to Fourier analysis. The techniques described may be used with BOC modulated signals or with any signals having at least two distinct sidebands.

96. 发明授权

EP1216514B1 APPARATUS AND METHODS FOR RECEIVING INFORMATION USING VARIABLE LENGTH ACCUMULATION SEARCHERS 有权
标题翻译：装置和方法接收使用积累探测器变量Lenge留言
公开(公告)号：EP1216514B1
公开(公告)日：2005-05-04
申请号：EP00959208.0
申请日：2000-08-11
申请人： Ericsson Inc.
发明人： SOUROUR, Essam, A. , ROBERTS, Clarence, V.
IPC分类号： H04B1/707
CPC分类号： H04B1/70775 , H04B1/70751 , H04B1/70752 , H04B1/70754 , H04B1/709 , H04B1/711 , H04B1/7117
摘要： Delays in a spread spectrum signal transmitted in a communications medium according to a spreading sequence may be determined by receiving a composite signal including the spread spectrum signal from the communications medium. The composite signal is correlated with the spreading sequence according to a first correlation length, to produce first time-offset correlations of the composite signal with the spreading sequence. Selected ones of the first time-offset correlations of the composite signal then are further correlated with the spreading sequence according to a second correlation length that is longer than the first correlation length, to produce second time-offset correlations of the composite signal with the spreading sequence. At least one of the second time-offset correlations may be selected. By providing variable length accumulation searchers, power and/or processing time can be saved by performing limited correlations for those delays that do not appear to be qualified candidates to be ultimately selected.

97. 发明公开

EP1447917A1 Adaptive acquisition system for spread spectrum transmissions compensating for frequency offset and noise 审中-公开
标题翻译：扩频传输补偿频偏和噪声的自适应采集系统
公开(公告)号：EP1447917A1
公开(公告)日：2004-08-18
申请号：EP04011029.8
申请日：1999-03-17
申请人： Sony Electronics Inc.
发明人： Chung, Sanguoon
IPC分类号： H04B1/707
CPC分类号： H04B1/70752 , H04B1/7075 , H04B1/70751 , H04B1/70755 , H04B1/70775 , H04B1/71 , H04J13/0022
摘要： An improved Pseudo Noise (PN) code acquisition apparatus and method for Code Division Multiple Access (CDMA) Direct Sequence Spread Spectrum (DSSS) systems which utilize a Fourier Transform and which operate in both additive white Gaussian noise and frequency offset environments. The signal to noise ratio (SNR) is generated and used not only to make the decision of when to stop the signal search process but also to adjust the search rate. The Fourier transform is implemented in ASIC hardware to estimate frequency offset. To further speed up its processing, the Fourier transform is performed using shift and add operations by employing canonic sign digit representation of the eigen vector of the Fourier transform. Detection probability is increased and false alarm probability is reduced significantly, especially in a frequency offset environment.
摘要翻译：一种用于码分多址（CDMA）直接序列扩频（DSSS）系统的改进的伪噪声（PN）码捕获设备和方法，该设备和方法利用傅里叶变换并且在加性高斯白噪声和频率偏移环境下工作。生成信噪比（SNR），不仅用于确定何时停止信号搜索过程，还用于调整搜索速率。傅立叶变换在ASIC硬件中实现以估计频率偏移。为了进一步加速其处理，傅立叶变换通过使用傅里叶变换的特征向量的正弦符号数字表示的移位和相加操作来执行。检测概率增加并且虚警概率显着降低，尤其是在频偏环境中。

98. 发明公开

EP1443684A2 Cell search procedure for TDD/CDMA communications systems 有权转让
标题翻译： Verfahren zur Zellensuche在TDD / CDMA-Nachrichtenübertragungssystemen
公开(公告)号：EP1443684A2
公开(公告)日：2004-08-04
申请号：EP04008295.0
申请日：2000-05-24
申请人： INTERDIGITAL TECHNOLOGY CORPORATION
发明人： Sezgin, Nadi , Ozluturk, Fatih
IPC分类号： H04B7/26 , H04B1/707
CPC分类号： H04B1/7083 , H04B1/70735 , H04B1/70752 , H04B2201/70702 , H04W28/26 , H04W74/04 , H04W88/08
摘要： A base station sends a synchronization signal in an assigned time slot to a user equipment in a time division duplex code division multiple access communication system. The base station has an assigned code group out of a predetermined number of code groups. The base station transmits selected secondary synchronization code signals out of a set of secondary synchronization code signals. The plurality of secondary synchronization code signals numbers less than half of the predetermined number of code groups. The user equipment identifies the transmitted selected secondary code signals. Based on in part the identified secondary synchronization code signals, the assigned code group is determined.
摘要翻译：基站将分配时隙中的同步信号发送到时分双工码分多址通信系统中的用户设备。基站具有预定数量的代码组中的分配代码组。基站从一组次同步码信号中发送选择的次同步码信号。多个次同步码信号的数目少于预定数量的码组的一半。用户设备识别所发送的选择的二次码信号。基于部分识别的次同步码信号，确定分配的代码组。

99. 发明公开

EP1078473A4 MULTISTAGE PN CODE ACQUISITION CIRCUIT AND METHOD 有权
标题翻译：多级PN码检测电路和程序
公开(公告)号：EP1078473A4
公开(公告)日：2004-07-21
申请号：EP00918318
申请日：2000-03-22
申请人： TEXAS INSTRUMENTS INC
发明人： SRIRAM SUNDARARAJAN , HOSUR SRINATH
IPC分类号： H04B1/707
CPC分类号： H04B1/70752 , H04B1/70735 , H04B1/7077 , H04B1/7093 , H04B2201/70702 , H04B2201/70707
摘要： A circuit for detecting a serial signal comprises a first circuit (400) coupled to receive the serial signal (200) during a predetermined plurality of time periods of substantially equal duration. The first circuit is coupled to receive a first code (414). The first circuit is arranged to compare a part of the serial signal corresponding to each time period of the plurality of time periods to the first code, thereby producing a match signal. The first circuit accumulates the match signal from each of the each time period of the plurality of time periods.

100. 发明授权

EP1188260B1 CELL SEARCH PROCEDURE FOR TIME DIVISION DUPLEX COMMUNICATION SYSTEMS USING CODE DIVISION MULTIPLE ACCESS 有权
标题翻译：方法在TDD / CDMA新闻传播系统的小区搜索
公开(公告)号：EP1188260B1
公开(公告)日：2004-07-14
申请号：EP00937742.5
申请日：2000-05-24
申请人： INTERDIGITAL TECHNOLOGY CORPORATION
发明人： SEZGIN, Nadir , OZLUTURK, Fatih
IPC分类号： H04B7/26
CPC分类号： H04B1/7083 , H04B1/70735 , H04B1/70752 , H04B2201/70702 , H04W28/26 , H04W74/04 , H04W88/08

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式