公开(公告)号：EP0969636B1

公开(公告)日：2007-04-25

申请号：EP98305166.5

申请日：1998-06-30

申请人： LUCENT TECHNOLOGIES INC.

发明人： Van Driest, H.

IPC分类号： H04L27/233

CPC分类号： H04L27/2332 ,  H03J7/04 ,  H04L7/0029 ,  H04L2027/003 ,  H04L2027/0046

公开(公告)号：EP1716682A1

公开(公告)日：2006-11-02

申请号：EP04712818.6

申请日：2004-02-19

申请人： Thomson Licensing

发明人： KOSLOV, Joshua

IPC分类号： H04L27/00 ,  H04L27/34 ,  H04B7/185

CPC分类号： H04L27/0014 ,  H04L27/3488 ,  H04L2027/0046

摘要： A satellite communications system comprises a transmitter, a satellite transponder and a receiver. The transmitter transmits an uplink layered modulation signal having an upper layer and a lower layer to the satellite transponder, which broadcasts the layered modulation signal downlink to one, or more, receivers. The receiver receives the layered modulation signal (the received signal) and performs demodulation and decoding of the lower layer signal component thereof by using a recovered carrier to derotate the received signal, wherein the recovered carrier is developed by a carrier recovery process driven by soft decisions with respect to the upper layer signal component of the received signal.

公开(公告)号：EP0994611B1

公开(公告)日：2006-09-27

申请号：EP98929730.4

申请日：1998-06-29

申请人： Kabushiki Kaisha Kenwood

发明人： HORII, Akihiro ,  SHIRAISHI, Kenichi

IPC分类号： H04L27/22

CPC分类号： H04L27/2273 ,  H04L27/22 ,  H04L27/2332 ,  H04L2027/0046 ,  H04L2027/0067

摘要： A small-scale absolute-phasing synchronization capturing circuit for absolute phasing of a received signal by selectively transmitting a baseband signal demodulated through a demodulator (1), a baseband signal subjected to phase rotation through a remapper (11), a baseband signal outputted from a first inverting means, and a baseband signal outputted from a second inverting means based on the phase angle of the received signal relative to the phase of the transmission signal. The most significant bit in the demodulated baseband signal and the most significant bit in the baseband signal subjected to phase rotation through the remapper (11) are extracted and a frame synchronization signal is captured according to the extracted significant bit.

公开(公告)号：EP1458088B1

公开(公告)日：2006-08-30

申请号：EP04006090.7

申请日：2004-03-15

申请人： SAMSUNG ELECTRONICS CO., LTD. ,  Korea Advanced Institute of Science and Technology

发明人： Choi, Pil-Soon Korea Advanced Institute of Science ,  Son, Mi-Hyun ,  Lee, Seong-Soo ,  Lee, Kwy-Ro Korea Advanced Institute of Science

IPC分类号： H03D3/00

CPC分类号： H03D3/007 ,  H04L27/22 ,  H04L2027/0024 ,  H04L2027/0046 ,  H04L2027/0065

公开(公告)号：EP1511186A1

公开(公告)日：2005-03-02

申请号：EP04104068.4

申请日：2004-08-25

申请人： STMicroelectronics Asia Pacific Pte Ltd

发明人： Muralidhar, Karthik ,  Oh, Ser Wah

IPC分类号： H04B1/707

CPC分类号： H04B1/7087 ,  H04B1/7115 ,  H04L2027/0024 ,  H04L2027/0046 ,  H04L2027/0065 ,  H04L2027/0091

摘要： A method and system for estimating a frequency offset between a receiver and a transmitter, including the steps of, or means for:

(a) receiving a first signal (1) from said transmitter and demodulating the first signal (18);
(b) performing a frequency shift on said first signal (18) by a predetermined frequency factor to generate a second signal (19);
(c) filtering each of said first and second signals (46,45);
(d) determining the power of each of the filtered first and second signals (48,47);
(e) determining an upper corner frequency value of the first signal us ing the power of the filtered first and second signals;
(f) determining a lower corner frequency of the first signal using the determined power of the filtered first and second signals; and
(g) determining a frequency offset value based on said upper corner frequency value and said lower comer frequency value (49).

摘要翻译： 一种用于估计接收机和发射机之间的频率偏移的方法和系统，包括以下步骤或装置：（a）从所述发射机接收第一信号（1）并解调第一信号（18）; （b）以预定的频率因子对所述第一信号（18）进行频移以产生第二信号（19）; （c）对所述第一和第二信号（46,45）中的每一个进行滤波; （d）确定滤波的第一和第二信号（48,47）中的每一个的功率; （e）使用所滤波的第一和第二信号的功率确定第一信号的上角频率值; （f）使用经滤波的第一和第二信号的确定的功率来确定第一信号的较低转角频率; 以及（g）基于所述上角频率值和所述较低角频率值（49）来确定频率偏移值。

公开(公告)号：EP1466421A1

公开(公告)日：2004-10-13

申请号：EP02781638.8

申请日：2002-12-09

申请人： Koninklijke Philips Electronics N.V.

发明人： XU, Luzhou ,  WANG, Dong

IPC分类号： H04B1/707 ,  H04L27/233

CPC分类号： H04B1/712 ,  H04B1/7117 ,  H04B2201/70701 ,  H04L2027/0046

摘要： Rake receivers in code division multiple access (CDMA) telecommunication comprise fingers (1,2,3) with each finger processing signal components for a particular transmission path to be able to better synchronize with a RF signal received via different paths, and a combiner (4) for combining the results originating from said fingers, and a compensator in the form of a controlled oscillator in a feedback loop. By locating a finger compensator (20-25) in a finger, said finger can handle complex situations, like Doppler shifts under high-speed conditions. Preferably, most or all fingers each comprise such a finger compensator, in which case said feedback loop can be avoided. Such a finger compensator can be hardware, software or a mixture of both when comprising a filter (21) plus an amplitude normalizer (22) between two arithmetical modules (20,25) for multiplying an input symbol signal with a conjugated previous input symbol signal and an output symbol signal with a previous output symbol signal.

公开(公告)号：EP1352480A2

公开(公告)日：2003-10-15

申请号：EP02713412.1

申请日：2002-01-16

申请人： Radiant Networks Plc

发明人： RAFIE, Manouchehr, S. ,  SHAH, Tushar ,  HWANG, Syang-Myau ,  LU, Jun

IPC分类号： H04B1/00

CPC分类号： H04L27/0014 ,  H04L27/3818 ,  H04L2027/003 ,  H04L2027/0046 ,  H04L2027/0053 ,  H04L2027/0087

摘要： A method for a carrier phase recovery apparatus in a multiple-link hopping radio system includes hopping among a plurality of radio links to receive bursts of radio signals on the plurality of radio links and determining channel information for each radio link from a received burst on the radio link. Further, the method includes storing the determined channel information and using the determined channel information for the radio link to reliably recover the carrier phase of a next received burst on the radio link.

公开(公告)号：EP1280309A1

公开(公告)日：2003-01-29

申请号：EP02015653.5

申请日：2002-07-16

申请人： SAMSUNG ELECTRONICS CO., LTD.

发明人： Kim, Dong-kyu, Netw.Sol. N Lab.,Central laboratory

IPC分类号： H04L27/26

CPC分类号： H04L27/2657 ,  H04L27/2684 ,  H04L2027/0028 ,  H04L2027/0038 ,  H04L2027/0046 ,  H04L2027/0067

摘要： A received signal is converted into a digital signal through an A/D converter (505) and then converted into the polar coordinate system (555). A synchronizer removes a frequency offset from the digital signal (510), the digital signal is again converted into an orthogonal coordinate system (560) and a fast fourier transform is performed with a FFT (525). The digital signal is again converted into the polar coordinate system (565). An equalizer (530) and a phase compensator (540) compensate respectively a channel distortion and a phase error to the digital signal. Thus, the OFDM receiver of the present invention using polar coordinate system and method thereof can reduce the number of adders and multipliers required in a frequency synchronization, a compensation for channel influence and a removal of remaining phase error by processing the signal in the polar coordinate system, thereby simplifying the calculation process and the receiver.

摘要翻译： 接收到的信号通过A / D转换器（505）转换成数字信号，然后转换成极坐标系（555）。 同步器从数字信号（510）中去除频率偏移，数字信号再次转换为正交坐标系（560），并通过FFT（525）执行快速傅里叶变换。 数字信号再次转换为极坐标系（565）。 均衡器（530）和相位补偿器（540）分别补偿数字信号的信道失真和相位误差。 因此，使用极坐标系的本发明的OFDM接收机及其方法可以通过处理极坐标中的信号来减少频率同步中所需的加法器和乘法器的数量，信道影响的补偿和剩余相位误差的消除 系统，从而简化了计算过程和接收器。

公开(公告)号：EP0854588A3

公开(公告)日：2002-09-11

申请号：EP98250012.6

申请日：1998-01-15

申请人： NEC CORPORATION

发明人： Vasic, Dobzica

IPC分类号： H04B7/005 ,  H04L27/227

CPC分类号： H04W52/08 ,  H04L1/06 ,  H04L27/2332 ,  H04L2027/0046 ,  H04L2027/0095 ,  H04W52/12 ,  H04W52/42

摘要： In order to reproduce a highly precise carrier for a coherent detection in a cellular mobile CDMA system, a first stage carrier estimation is performed by using pilot symbols inserted into a received signal and having a known code pattern, a data symbol train of the received signal is preparatively detected by using the estimated carrier and a second stage carrier estimation is performed for the received signal by using the detected data symbol train and the pilot symbols.

公开(公告)号：EP1237285A2

公开(公告)日：2002-09-04

申请号：EP02090064.3

申请日：2002-02-20

申请人： Broadcom Corporation

发明人： Karaoguz, Jeyhan

IPC分类号： H03M13/25

CPC分类号： H03M13/256 ,  H03M13/235 ,  H03M13/2903 ,  H03M13/4123 ,  H03M13/413 ,  H03M13/6505 ,  H04L2027/003 ,  H04L2027/0046 ,  H04L2027/0095

摘要： An encoder includes a state machine configured to generate a payloads as a function of a state machine output, and an interface configured to generate a tail as a function of a binary representation of the state machine output at the end of the payload generation. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or the meaning of the claims.

摘要翻译： 编码器包括被配置为根据状态机输出生成有效载荷的状态机，以及被配置为根据在有效载荷生成结束时的状态机输出的二进制表示的函数生成尾部的接口。 要强调的是，该摘要被提供以符合要求摘要的规则，这将允许搜索者或其他读者快速确定技术公开内容的主题。 提交它的理解是，它不会用于解释或限制权利要求的范围或含义。