公开(公告)号：US06804306B2

公开(公告)日：2004-10-12

申请号：US09758401

申请日：2001-01-10

申请人： Daniel G. Knierim ,  Barton T. Hickman

发明人： Daniel G. Knierim ,  Barton T. Hickman

IPC分类号： H04L2700

CPC分类号： H04L27/0014 ,  H04L2027/0016

摘要： A method for generating an in-phase (I) output signal and a quadrature-phase (Q) output signal from an input signal reduces phase error in the I/Q generator by delaying-and-doubling an input signal to produce a Q output signal and delaying the input signal twice and subtracting the same from the input signal to produce an I output signal. The I/Q generator includes a first 90°-phase delay circuit receiving an input signal and outputting an intermediate Q signal; a second 90°-phase delay circuit receiving the intermediate Q signal and producing an intermediate I signal. It also includes a signal doubler receiving the intermediate Q signal and producing a Q output signal of twice the amplitude of the input signal at a 90° phase angle. Finally, the generator includes a signal differencer receiving the input signal and the intermediate I signal and producing an I output signal of substantially twice the amplitude of the input signal at a 0° phase angle. The first and second delay circuits need only be substantially matched with one another to render the I/Q generator amplitude and phase stable over a broad range of manufacturing process, operating temperature and input signal frequency variation.

摘要翻译： 用于从输入信号产生同相（I）输出信号和正交相位（Q）输出信号的方法通过将输入信号延迟加倍以产生Q输出来减少I / Q发生器中的相位误差 信号并延迟输入信号两次，并从输入信号中减去输入信号以产生I输出信号。 I / Q发生器包括接收输入信号并输出​​中间Q信号的第一90°相位延迟电路; 接收中间Q信号并产生中间I信号的第二90°相位延迟电路。 它还包括接收中间Q信号的信号倍增器，并以90°相位角产生输入信号幅度的两倍的Q输出信号。 最后，发生器包括接收输入信号和中间I信号的信号差分器，并且以0°相位角产生输入信号振幅大致两倍的I输出信号。 第一和第二延迟电路仅需要彼此基本匹配，以使I / Q发生器的幅度和相位在宽的制造工艺，工作温度和输入信号频率变化范围内稳定。

公开(公告)号：US06744825B1

公开(公告)日：2004-06-01

申请号：US09297276

申请日：1999-06-21

申请人： Knut Rimstad ,  Alv Aarskog

发明人： Knut Rimstad ,  Alv Aarskog

IPC分类号： H04L2700

CPC分类号： H04L27/206 ,  H03M3/50 ,  H03M7/3028 ,  H03M7/304 ,  H03M7/3042

摘要： A method and system for quadrature modulation and digital-to-analog conversion of a sampled and digitally represented complex baseband signal which permits the use of simple, power-saving, accurate and effective digital signal processing up to a very high intermediate frequency. The invention requires an input signal in the form of an oversampled complex baseband signal. The inphase (I) and quadrature-phase (Q) components of this signal are first quantized to preferably 1 bit per sample, e.g., with the aid of &Sgr;&Dgr; modulation, so that the quantization noise is essentially forced outside the frequency band of the working signal. Then the sampling rate of the quantized versions of I and Q is converted to four times the desired carrier frequency, before the signal is quadrature modulated with a signal frequency exactly equal to one quarter of the final sampling rate. Finally the ready processed digital signal is converted to an analog quadrature modulated signal through a digital-to-analog converter followed by a bandpass filter.

摘要翻译： 用于正交调制和采样和数字化表示的复基带信号的数模转换的方法和系统，其允许使用简单，功率节省，精确和有效的数字信号处理达到非常高的中频。 本发明需要以过采样的复基带信号的形式的输入信号。 该信号的同相（I）和正交相（Q）分量首先被量化为优选地每个样本1位，例如借助SigmaDelta调制，使得量化噪声基本上被强制在工作频带外 信号。 然后在信号采用恰好等于最终采样率四分之一的信号频率进行正交调制之前，将I和Q的量化版本的采样率转换为所需载波频率的四倍。 最后，准备处理的数字信号通过数模转换器转换成模拟正交调制信号，随后是带通滤波器。

公开(公告)号：US06721364B1

公开(公告)日：2004-04-13

申请号：US09435790

申请日：1999-11-08

申请人： Masatoshi Ueno ,  Kazunobu Toguchi

发明人： Masatoshi Ueno ,  Kazunobu Toguchi

IPC分类号： H04L2700

CPC分类号： H04L12/40065 ,  H04L12/40091 ,  H04L12/6418

摘要： Communication equipment having an available bandwidth less than 100 Mbps may be regarded as IEEE1394 communication equipment in which buses (21, 31) are connected together via a bridge (40). The bridge (40) includes portals (40A, 40B), and the portals (40A, 40B) communicate with each other through infrared rays. RAMs (43A, 43B) include bandwidth available registers for writing a remaining amount of an available bandwidth, which may be used in an isochronous communication within the bridge (40). ROMs (44A, 44B) store an available bandwidth, which may be used in a isochronous communication in respective infrared communication units (45A, 45B), as an initial value (BWR). When the bridge (40) is initialized, the initial value (BWR) is written in the bandwidth available registers. Thus, even when an available bandwidth between the infrared communication units (45A, 45B) is less than 100 Mbps, the bridge (40) may be regarded and operated as communication equipment in which the available bandwidth is 100 Mbps.

摘要翻译： 具有小于100Mbps的可用带宽的通信设备可以被认为是其中总线（21,31）经由桥（40）连接在一起的IEEE1394通信设备。 桥（40）包括入口（40A，40B），并且门（40A，40B）通过红外线彼此连通。 RAM（43A，43B）包括用于写入可用带宽的剩余量的带宽可用寄存器，其可用于桥（40）内的等时通信。 ROM（44A，44B）将可用带宽存储在各红外通信单元（45A，45B）中的等时通信中作为初始值（BWR）。 当桥（40）被初始化时，初始值（BWR）被写入带宽可用寄存器中。 因此，即使当红外通信单元（45A，45B）之间的可用带宽小于100Mbps时，也可以将桥接器（40）视为可用带宽为100Mbps的通信设备。

公开(公告)号：US06628723B1

公开(公告)日：2003-09-30

申请号：US09418853

申请日：1999-10-15

申请人： Derek Gerlach ,  James M. Gardner ,  Vincent K. Jones, IV

发明人： Derek Gerlach ,  James M. Gardner ,  Vincent K. Jones, IV

IPC分类号： H04L2700

CPC分类号： H04L1/005 ,  H03M13/2963 ,  H03M13/6362 ,  H04L1/0066 ,  H04L1/0068

摘要： Systems and methods for precisely controlling the amount of redundancy introduced by a turbo encoding process. Bits having predetermined values are introduced into the turbo encoding input stream and then deleted from the turbo encoding output stream. At the receiver end, the bits having predetermined values are reintroduced into the encoded information stream as having been received with a maximum confidence level. Coding rate may be varied by varying the number of bits having predetermined values which are inserted at the encoder input. This scheme permits the amount of redundancy to be varied according to system requirements.

摘要翻译： 用于精确控制由turbo编码过程引入的冗余量的系统和方法。 将具有预定值的位引入turbo编码输入流，然后从Turbo编码输出流中删除。 在接收端，具有预定值的比特被重新引入编码的信息流中，因为已经以最大的置信水平被接收。 可以通过改变在编码器输入处插入的具有预定值的位数来改变编码速率。 该方案允许冗余量根据系统要求而变化。

公开(公告)号：US06560292B1

公开(公告)日：2003-05-06

申请号：US09547824

申请日：2000-04-07

申请人： Stein Lundby ,  Keith Saints

发明人： Stein Lundby ,  Keith Saints

IPC分类号： H04L2700

CPC分类号： H04L1/0068 ,  H04B1/707 ,  H04L1/0041 ,  H04L1/02 ,  H04L25/14 ,  H04W36/06 ,  H04W36/18 ,  H04W52/20 ,  H04W52/40

摘要： A method is taught for improving the transmission of information signals in a communications system having a base station and a remote station. First and second transmission links are established with the remote station. An information signal is encoded to provide an encoded information signal having more bits than the information signal. First and second transmission signals are provided wherein each transmission signal has bits selected from the encoded information signal. Each of the first and second transmission signals is transmitted to the remote station by way of a respective one of the first and second transmission links. The remote station receives and combines the first and second transmission signals transmitted by the remote station to provide a combined encoded signal. The combined encoded signal is decoded by the remote station to provide the information signal. The first and second transmission links can be formed between the remote station and a single base station or between the remote station and two separate base stations.

公开(公告)号：US06560290B2

公开(公告)日：2003-05-06

申请号：US09234619

申请日：1999-01-20

申请人： Gijung Ahn ,  Deog-Kyoon Jeong ,  Gyudong Kim

发明人： Gijung Ahn ,  Deog-Kyoon Jeong ,  Gyudong Kim

IPC分类号： H04L2700

CPC分类号： H04L25/028 ,  H04L25/0272 ,  H04L25/0292

摘要： New very high-speed CMOS techniques are used to achieve a CMOS driver operating at gigabaud speeds. Such a driver may be manufactured more easily than drivers that use GaAs or bipolar techniques and further may be easily integrated with other CMOS circuits. A communication system utilizing the gigabaud CMOS driver may additionally include a receiver with on-chip termination to significantly reduce distortion in the presence of parasitic capacitance in inductance in comparison to a receiver with external termination. Furthermore, the communication system may include a phase tracker and a frame aligner. The phase tracker continously monitors the most frequent transition edges in the oversampled data so that the phase of the receiver clock keeps track of the sender clock. The frame aligner comprises a comma detector which enables instant synchronization of data words with a single comma character within a serial data stream.

摘要翻译： 使用新的非常高速的CMOS技术来实现以千兆位速度运行的CMOS驱动器。 这样的驱动器可以比使用GaAs或双极技术的驱动器更容易制造，并且还可以容易地与其他CMOS电路集成。 与具有外部端接的接收机相比，使用千兆位CMOS驱动器的通信系统可以另外包括具有片上终止的接收器，以在存在电感中的寄生电容的情况下显着减少失真。 此外，通信系统可以包括相位跟踪器和帧对准器。 相位跟踪器连续监视过采样数据中最频繁的转换边沿，使得接收机时钟的相位跟踪发送器时钟。 帧对准器包括逗号检测器，该逗号检测器使串行数据流中具有单个逗号字符的数据字能够即时同步。

公开(公告)号：US06498817B1

公开(公告)日：2002-12-24

申请号：US09555302

申请日：2000-05-26

申请人： Ralf Malzahn

发明人： Ralf Malzahn

IPC分类号： H04L2700

CPC分类号： G06F21/755

摘要： The invention relates to a circuit arrangement which includes a stage for the processing of data signals which are applied to the stage in a selectable sequence during time intervals defined by a clock signal. In order to construct a circuit arrangement of this kind in such a manner that the power consumption which is dependent on the data signals is disguised, the invention proposes to supply the circuit arrangement, with modified data signals, instead of the data signals to be processed, in a respective part of each time interval.

摘要翻译： 本发明涉及一种电路装置，其包括用于处理在由时钟信号定义的时间间隔期间以可选择的顺序施加到该级的数据信号的级。为了以这种方式构建这种电路装置 认为取决于数据信号的功率消耗是伪装的，本发明建议在每个时间间隔的相应部分中提供具有修改的数据信号而不是待处理的数据信号的电路装置。

公开(公告)号：US06480554B1

公开(公告)日：2002-11-12

申请号：US09184619

申请日：1998-11-02

申请人： Antti Toskala ,  Ari Hottinen

发明人： Antti Toskala ,  Ari Hottinen

IPC分类号： H04L2700

CPC分类号： H04L1/0046 ,  H04L1/0054 ,  H04L25/0202 ,  H04L25/0262 ,  H04L43/0894

摘要： A method and circuitry for channel estimation in a cellular communication system is disclosed. Data is transmitted with variable data transmission rates as a plurality of data symbols over a sequence of time slots. Each time slot has at least a proportion containing data symbols, the proportion being dependent on the data transmission rate. An estimate of the transmission rate is determined and is used in channel estimation so that the channel estimation is based on the proportion of received data symbols.

摘要翻译： 公开了一种用于蜂窝通信系统中的信道估计的方法和电路。 以可变数据传输速率在一系列时隙上将数据作为多个数据符号发送。 每个时隙具有包含数据符号的至少一个比例，该比例取决于数据传输速率。 确定传输速率的估计，并将其用于信道估计，使得信道估计基于接收到的数据符号的比例。

公开(公告)号：US06463104B1

公开(公告)日：2002-10-08

申请号：US09281773

申请日：1999-03-30

申请人： Josef Dirr

发明人： Josef Dirr

IPC分类号： H04L2700

CPC分类号： H04L27/02 ,  H04L25/4902

摘要： This invention concerns a method of increasing coding levels. In this method, an increase in levels is achieved with multi-level coding, where uninterrupted periodic sequences such as an alternating current of the same frequency and phase relation are provided as the code elements, and where the code elements are flagged with respect to one another by changes in amplitude; this increase in levels is achieved by the fact that the next code element begins or ends either with a positive or negative half-period, so that two levels can be marked with one code element. This has the effect, for example, that six levels are obtained instead of three. In numbers, this means that with three levels and two, three, four and five places there are 9, 27, 81 and 243 combinations, and with six levels and two, three four and five places there are 36, 216, 1296 and 7776 combinations.

摘要翻译： 本发明涉及增加编码水平的方法。 在这种方法中，通过多电平编码实现了电平的增加，其中提供了诸如相同频率和相位关系的交流的不间断周期性序列作为代码元素，并且其中代码元素相对于一个标记 另一个是通过振幅的变化; 这种增加的水平是通过以下事实来实现的：下一个代码元素以正半周期或负半周期开始或结束，从而可以用一个代码元素来标记两个级别。 这具有例如获得六个级别而不是三个等级的效果。 在数字上，这意味着三，二，三，四，五个地方有9,27,81和243个组合，六个二，三，四，五个地方有36个，216个，1296个和7776个 组合。

公开(公告)号：US06449313B1

公开(公告)日：2002-09-10

申请号：US09300314

申请日：1999-04-28

申请人： Engin Erzin ,  Michael C. Recchione

发明人： Engin Erzin ,  Michael C. Recchione

IPC分类号： H04L2700

CPC分类号： G10L19/12 ,  G10L2019/0013

摘要： A fixed codebook response is able to better characterize an input signal of a vocoder because the entries of the fixed codebook are tailored to the input signal being processed. A uniformly distributed random noise signal is stored in a transmitting vocoder. During encoding by the transmitting vocoder, the noise signal is shaped by a weighing filter and a pitch sharpening filter, which are condition controlled by the linear predictive coding, pitch and pitch gain characteristics of the input signal being encoded. The shaped noise signal is passed though a thresholding filter to arrive at a pulse sequence having a given sparcity. The fixed codebook response is chosen as that portion of the pulse sequence which best matches a residual signal of the input signal. The indexed location of that portion along the pulse sequence is designated as the fixed codebook bits which are included within the bit frame. The identical random noise signal is stored in a receiving vocoder. The linear predictive coding, pitch, and pitch gain characteristics are part of the bit frame, and are again used to produce an identical pulse sequence. The fixed codebook bits of the bit frame are used to index the pulse sequence to the best matching portion, and hence the fixed codebook response for the bit frame.

摘要翻译： 固定码本响应能够更好地表征声码器的输入信号，因为固定码本的条目适合正在处理的输入信号。 均匀分布的随机噪声信号被存储在发送声码器中。 在通过发送声码器的编码期间，噪声信号通过称重滤波器和音调锐化滤波器来形成，该滤波器是通过被编码的输入信号的线性预测编码，音调和音调增益特性来控制的。 成形噪声信号通过阈值滤波器以得到具有给定稀疏度的脉冲序列。 选择固定码本响应作为与输入信号的残差信号最佳匹配的脉冲序列的那部分。 将该部分沿着脉冲序列的索引位置指定为包括在位帧内的固定码本位。 相同的随机噪声信号被存储在接收声码器中。 线性预测编码，音调和音调增益特性是位帧的一部分，并且再次用于产生相同的脉冲序列。 位帧的固定码本位用于将脉冲序列索引到最佳匹配部分，因此用于位帧的固定码本响应。