公开(公告)号：US20040240376A1

公开(公告)日：2004-12-02

申请号：US10449992

申请日：2003-05-30

申请人： Agency For Science, Technology and Research

发明人： Zhongjun Wang ,  Lee Guek Yeo ,  Xiaodan Gan

IPC分类号： H04J009/00

CPC分类号： H04L25/022 ,  H04L25/0228 ,  H04L27/265 ,  H04L2025/03414

摘要： A method for channel response estimation for an OFDM communication system based on a certain normal training symbols plus one virtual training symbol begins with receiving at least one preamble symbol of a transmitted data frame. A first channel state information is estimated from the at least one preamble symbol. At least one signalling symbol is then received and equalized and a rate factor and a length factor are extracted from the at least one signalling symbol. A virtual training symbol is formed from the rate factor and the length factor. A second channel state information is estimated from the at least one preamble symbol and the virtual training symbol. The data symbols are equalized by performing channel correction on data symbols with the second channel estimation and pilot sub-carriers in each of the plurality of data symbols.

摘要翻译： 基于某些正常训练符号加上一个虚拟训练符号的OFDM通信系统的信道响应估计方法开始于接收发射数据帧的至少一个前导符号。 从至少一个前导符号估计第一信道状态信息。 然后接收和均衡至少一个信令符号，并且从至少一个信令符号提取速率因子和长度因子。 虚拟训练符号由速率因子和长度因子形成。 从至少一个前导符号和虚拟训练符号估计第二信道状态信息。 通过对数据符号进行信道校正，通过在多个数据符号中的每一个中的第二信道估计和导频子载波来均衡数据符号。

公开(公告)号：US20020097667A1

公开(公告)日：2002-07-25

申请号：US09862261

申请日：2001-05-21

申请人： LSI LOGIC CORPORATION

发明人： Kalvin Williams

IPC分类号： H04J009/00

CPC分类号： H04L25/493

摘要： An apparatus for receiving and processing an electrical signal in the form of a pulse train comprising a plurality of pulses. The apparatus generally comprises a processor, a memory and a timer. The timer may be configured to generate a respective value representative of the positions of each leading and trailing edge of each pulse in the pulse train. The memory may be configured to receive the value and write the value. The timer may be configured to generate an interrupt signal following receipt of the trailing edge of the last pulse in the pulse train and apply the interrupt signal to the processor. The processor may read the values stored in the memory for decoding the pulse train in response to said interrupt signal.

摘要翻译： 一种用于接收和处理包括多个脉冲的脉冲串形式的电信号的装置。 该装置通常包括处理器，存储器和定时器。 定时器可以被配置为生成表示脉冲串中每个脉冲的每个前沿和后沿的位置的相应值。 可以将存储器配置为接收值并写入值。 定时器可以被配置为在接收到脉冲串中的最后脉冲的后沿之后产生中断信号，并将该中断信号施加到处理器。 处理器可以读取存储在存储器中的值，以响应于所述中断信号对脉冲序列进行解码。

公开(公告)号：US20020015382A1

公开(公告)日：2002-02-07

申请号：US09879332

申请日：2001-06-12

发明人： Kunio Fukuda

IPC分类号： H04J009/00

CPC分类号： H04W72/048 ,  H04L5/023 ,  H04W16/02 ,  H04W72/0453

摘要： A plurality of frequency-channels are provided, each composed of an OFDM multi-carrier. The OFDM sub-carrier of each channel is orthogonal to the sub-carrier of any other channel, so that two or more channels may be considered to transmit the same OFDM signal. Further, a sub-area that uses two or more channels is provided in each service area in which a base station is located at the center and assigned with a basic-frequency channel.

摘要翻译： 提供多个频道，每个频道由OFDM多载波组成。 每个信道的OFDM子载波与任何其他信道的子载波正交，使得可以考虑两个或更多个信道来发送相同的OFDM信号。 此外，在基站位于中心并分配有基本频率信道的每个服务区域中提供使用两个或更多个信道的子区域。

公开(公告)号：US20020131389A1

公开(公告)日：2002-09-19

申请号：US09151996

申请日：1998-09-11

发明人： RONALD D. BOESCH ,  DOMENICO ARPAIA

IPC分类号： H04B007/216 ,  H04L005/04 ,  H04J009/00 ,  H04L025/00 ,  H04L027/00

CPC分类号： H04B1/7101 ,  H03C3/40 ,  H04B1/707 ,  H04L27/2071

摘要： A narrow bandwidth signal, such as a narrowband FM signal, is modulated in a modulator that modulates a wide bandwidth signal, such as a CDMA signal, by oversampling the narrow bandwidth signal and applying the oversampled narrow bandwidth signal to the modulator. By oversampling the narrow bandwidth signal, the same fixed low pass filter can be used for both the wide bandwidth signal and the oversampled narrow bandwidth signal. Accordingly, different low pass filters or switched low pass filters are not needed. The DC offset that is introduced by the digital-to-analog converter and/or the low pass filter of the modulator is compensated, preferably in the digital domain, to thereby reduce DC offset within acceptable limits for the modulation that is being used. More preferably, compensation is provided by subtracting from the sampled signal, a digital value representing the DC offset in the filtered analog signal that is introduced by the digital-to-analog converter and/or the low pass filter. A sensor senses the DC offset in the filtered analog signal. An analog-to-digital converter is responsive to the sensor to convert the sensed DC offset into a digital offset signal. A subtractor is responsive to the analog-to-digital converter to subtract the digital DC offset signal from the sampled signal and to apply the sampled signal minus the DC offset signal, to the digital-to-analog converter.

摘要翻译： 诸如窄带FM信号的窄带宽信号在调制器中被调制，该调制器通过对窄带宽信号进行过采样并将过采样窄带宽信号施加到调制器来调制诸如CDMA信号的宽带信号。 通过对窄带宽信号进行过采样，相同的固定低通滤波器可用于宽带宽信号和过采样窄带宽信号。 因此，不需要不同的低通滤波器或开关式低通滤波器。 由数模转换器和/或调制器的低通滤波器引入的DC偏移优选地在数字域中进行补偿，从而将DC偏移降低到正在使用的调制的可接受限度内。 更优选地，通过从采样信号中减去表示由数模转换器和/或低通滤波器引入的经滤波的模拟信号中的DC偏移的数字值来提供补偿。 传感器检测滤波后的模拟信号中的直流偏移。 模数转换器响应于传感器将感测的DC偏移转换成数字偏移信号。 减法器响应于模数转换器从采样信号中减去数字DC偏移信号，并将采样信号减去DC偏移信号施加到数 - 模转换器。

公开(公告)号：US20010024441A1

公开(公告)日：2001-09-27

申请号：US09731952

申请日：2000-12-07

发明人： David E. Bateman ,  Matthew Bush

IPC分类号： H04J009/00

CPC分类号： H04B3/548 ,  H04B2203/5408 ,  H04B2203/5416 ,  H04B2203/5458 ,  H04B2203/547

摘要： A multiplex bus interface enables power and data to be transmitted and received on a two wire bus. Input and output devices operate with transceivers connected to the bus to communicate with each other by placing their data on the bus within specific time slots controlled by a controller, a clock module which broadcasts data to all connected transceivers. A pulsed power waveform provides power to the transceivers and data through pulse width modulation of the pulsed waveform. Data from the transceivers is transmitted during a time slot between power pulses. Data integrity is checked by the initiating input transceiver. Errors are reported at the end of a broadcast cycle. Output transceivers use the data as appropriate for the device and condition being monitored or controlled.

摘要翻译： 复用总线接口使电源和数据能够在两线总线上传输和接收。 输入和输出设备通过连接到总线的收发器进行操作，通过将控制器控制的特定时隙内的数据放置在总线上，将数据相互通信，时钟模块向所有连接的收发器广播数据。 脉冲功率波形通过脉冲波形的脉冲宽度调制为收发器和数据提供电力。 来自收发器的数据在功率脉冲之间的时隙中传输。 启动输入收发器检查数据完整性。 在广播周期结束时报告错误。 输出收发器使用适合于监视或控制的设备和状况的数据。

公开(公告)号：US20040170120A1

公开(公告)日：2004-09-02

申请号：US10755871

申请日：2004-01-12

发明人： Jukka Reunamaki ,  Arto Palin ,  Heikki Berg ,  Mauri Honkanen

IPC分类号： H04L005/04 ,  H04J009/00

CPC分类号： H04L27/205 ,  H04L27/2017

摘要： The present invention relates to a method for modulating a signal in a system providing short-range wireless communication. In the signal, the signal is transmitted in packet format, in which each packet comprises at least a first part and a second part. In the method, the first part and the second part are modulated by using the first modulation method and the second modulation method, respectively. The second modulation method is initialized by using the first part. The invention also relates to a transceiver device and a wireless communication system, in which the method is applied.

摘要翻译： 本发明涉及一种在提供短距离无线通信的系统中调制信号的方法。 在该信号中，信号以分组格式发送，其中每个分组包括至少第一部分和第二部分。 在该方法中，分别使用第一调制方法和第二调制方法来调制第一部分和第二部分。 通过使用第一部分来初始化第二调制方法。 本发明还涉及一种应用该方法的收发机设备和无线通信系统。

公开(公告)号：US20030128657A1

公开(公告)日：2003-07-10

申请号：US10169317

申请日：2002-07-03

发明人： Noriyoshi Kuroyanagi ,  Naoki Suehiro ,  Masakazu Takahashi

IPC分类号： H04J009/00

CPC分类号： H04J13/105 ,  H04B2201/70701 ,  H04J13/0022 ,  H04L7/041

摘要： A system using a transmitter which comprises means of generating 4 extended sequences EA0, EA1, EB0 and EB1 using a set (A0,A1) of auto-complementary sequences with length L chips consisting of complete complementary sequences and another similar set (B0,B1), and means of generating a transmitting frame sP obtained by multiplying a cascaded sequence nullA made of extended sequences EA0 and EA1 by a pilot information {circumflex over (p)}, generating a transmitting frame sD obtained by multiplying a cascaded sequence nullB made of extended sequences EB0 and EB1 by data b, synchronously adding both the transmitting frames to produce a symbol frame, and transmitting a carrier wave modulated thereby, and a receiver which comprises means of applying a front portion r0 of the synchronously received baseband frame demodulated by above described carrier wave to matched filters M(A0) and M(B0), and applying a rear portion r1 of the synchronously received frame to matched filters M(A1) and M(B1), and means of generating a pilot-response-matrix nullpnull and a received data-response-matrix null, both made of the outputs of M(A0) and M(A1), and of the outputs of M(B0) and M(B1) respectively, and generating an estimate {tilde over (b)} of transmitted data.

摘要翻译： 一种使用发射机的系统，其包括使用具有由完全互补序列组成的长度为L个码片的自身互补序列的集合（A0，A1）和另一相似集合（B0，B1）生成4个扩展序列EA0，EA1，EB0和EB1的装置 ）和产生通过将由扩展序列EA0和EA1构成的级联序列ΔA乘以导频信息p而获得的发送帧sP的装置，生成通过将由扩展序列EB0和EB1构成的级联序列ÊB乘以由扩展序列EB0和EB1构成的级联序列 数据b同步地加上两个发送帧以产生符号帧，并发送由此调制的载波，以及一个接收机，包括将由上述载波解调的同步接收的基带帧的前部r0应用到匹配滤波器 M（A0）和M（B0），并将同步接收的帧的后部r1应用于匹配滤波器M（A1）和M（B1） 分别由M（A0）和M（A1）的输出和M（B0）和M（B1）的输出分别构成的ga导频响应矩阵{p}和接收的数据 - 响应矩阵PHI ，并生成发送数据的估计b。

公开(公告)号：US20020051424A1

公开(公告)日：2002-05-02

申请号：US09362002

申请日：1999-07-27

发明人： RAJEEV KRISHNAMOORTHY ,  SHANKAR NARAYANASWAMY ,  MARKUS RUPP ,  HARISH VISWANATHAN

IPC分类号： H04J003/16 ,  H04J009/00 ,  H04Q007/00

CPC分类号： H04W72/087 ,  H04L1/0003 ,  H04L1/0015 ,  H04W24/00 ,  H04W28/22 ,  H04W74/04

摘要： In a system in which the modulation scheme employed may change on a per-time-slot basis, a user's available data rate may change even if the user maintains the same number of time slots, because the capacity of the user's time slots may change. If one or more such changes in modulation scheme occurs, the data rate available to the user may no longer match his current data rate needs. Therefore, a method is disclosed for determining the number of time slots to assign to a user as a function of the user's current data rate requirement and the actual current cumulative data rate of the time slots currently assigned to the user. The user data rate requirement may further be a function of a quality of service (QoS) contracted for by the user. Thus, the assignment of the time slots within the frame is made dynamically and the number of time slots employed by a user is increased or decreased according to the user's current data rate requirements and the ability of the time slots already assigned to the user to meet those requirements.

摘要翻译： 在所采用的调制方案可以在每个时隙的基础上改变的系统中，即使用户维持相同数量的时隙，用户的可用数据速率也可能改变，因为用户时隙的容量可能会改变。 如果发生调制方案中的一个或多个这样的改变，则用户可用的数据速率可能不再符合他当前的数据速率需求。 因此，公开了一种用于根据用户当前数据速率要求和当前分配给用户的时隙的实际当前累积数据速率来确定分配给用户的时隙数量的方法。 用户数据速率要求还可以是由用户签约的服务质量（QoS）的函数。 因此，动态地分配帧内的时隙，并根据用户的当前数据速率要求和已经分配给用户的时隙的能力来增加或减少用户使用的时隙数量 那些要求。