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1. 发明申请

US20080240284A1 SYSTEM AND METHOD FOR DIGITAL MODULATION 审中-公开
标题翻译：数字调制系统与方法
公开(公告)号：US20080240284A1
公开(公告)日：2008-10-02
申请号：US11694495
申请日：2007-03-30
申请人： Peter E. Chow
发明人： Peter E. Chow
IPC分类号： H04L27/00 , H03C3/00
CPC分类号： H04B1/30 , H03D7/00 , H03D2200/0052 , H03D2200/0068 , H03F3/19 , H03F3/2175
摘要： The present invention is directed to a system and method which allows for power amplification of an input signal using power amplification combined by changing the center frequency with an up-converter to shift a baseband signal to a signal at a carrier frequency in the same process. This then provides a digital implementation that is power efficient and has little or no linearity issue-technology suitable for a silicon chip and broadband operation. In one embodiment, each input sample is replaced with a number of sub-samples within the same sample interval, the total weight of the sub-samples being equal to the replaced sample. This sample to sub-samples process alters the frequency response of the sampled signal and reduces the amplitude dynamic range of the load driver, thereby simplifying the filter requirements for digital to analog conversion while reducing linearity requirement of the load driver. This process can be implemented by digital circuits which results in broadband operation.
摘要翻译：本发明涉及一种系统和方法，其允许通过使用上变频器改变中心频率而组合的功率放大器来对输入信号进行功率放大，以将相位处理中的基带信号移位到载波频率处的信号。这就提供了一种功率有效的数字实现，并且具有很少或没有线性问题 - 适用于硅芯片和宽带操作的技术。在一个实施例中，每个输入样本被替换为相同采样间隔内的多个子样本，子样本的总权重等于替换的样本。子样本处理的样本改变了采样信号的频率响应，并降低了负载驱动器的振幅动态范围，从而简化了数模转换的滤波器要求，同时降低了负载驱动器的线性度要求。该过程可以由导致宽带操作的数字电路来实现。

2. 发明授权

US5564121A Microcell layout having directional and omnidirectional antennas defining a rectilinear layout in a building 失效
标题翻译：具有在建筑物中定义直线布局的定向和全向天线的微小区布局
公开(公告)号：US5564121A
公开(公告)日：1996-10-08
申请号：US292275
申请日：1994-08-18
申请人： Peter E. Chow , Ali K. Karim , Victor Fung
发明人： Peter E. Chow , Ali K. Karim , Victor Fung
IPC分类号： H04B7/04 , H04W16/02 , H04W16/12 , H04W16/24 , H04W16/32 , H04B1/04
CPC分类号： H04W16/12 , H04B7/0408 , H04W16/02 , H04W16/24 , H04W16/32
摘要： A radio communication system is provided wherein radio coverage building blocks are used to provide uniform radio coverage to rectilinear floor layouts of buildings. The building blocks are comprised of directional and omnidirectional antennas which are applied to rectangular and irregular layouts. Each building block is divided into multiple small zones and each zone is covered by an antenna. Each antenna in the building block is connected to the same base station through a low loss coupling matrix and all antennas transmit and receive simultaneously. The directional antennas are located near the boundary of the service area. An omnidirectional or directional antenna at the center of the zone may be used to fill the rest of the area.
摘要翻译：提供了一种无线电通信系统，其中无线电覆盖构建块用于向建筑物的直线地板布局提供统一的无线电覆盖。构造块由方向和全向天线组成，应用于矩形和不规则布局。每个建筑块分为多个小区域，每个区域都被天线覆盖。构建块中的每个天线通过低损耗耦合矩阵连接到同一基站，并且所有天线同时发射和接收。定向天线位于服务区域边界附近。区域中心的全向或定向天线可用于填充该区域的其余部分。

3. 发明授权

US4592070A ADPCM encoder/decoder with improved tracking 失效
标题翻译： ADPCM编码器/解码器具有改进的跟踪功能
公开(公告)号：US4592070A
公开(公告)日：1986-05-27
申请号：US555357
申请日：1983-11-28
申请人： Peter E. Chow , Andreas H. Weirich , Leo Strawczynski
发明人： Peter E. Chow , Andreas H. Weirich , Leo Strawczynski
IPC分类号： H03M3/04 , H04B14/06
CPC分类号： H03M3/042
摘要： An ADPCM encoder and decoder includes an adaptive quantizer and an adaptive predictor. A quantizing-step-size adaptation circuit determines a quantizing-step-size for the adaptive quantizer in dependence upon the ADPCM signal. When the quantizing-step-size is small, updating of predictor coefficients, produced in the adaptive predictor, in dependence upon a reconstructed signal and a reconstructed error signal derived from the ADPCM signal, is inhibited, the predictor coefficients being updated only in dependence upon a leakage function. This enables improved tracking to be achieved by the ADPCM arrangement.
摘要翻译： ADPCM编码器和解码器包括自适应量化器和自适应预测器。量化步长适应电路根据ADPCM信号确定自适应量化器的量化步长。当量化步长小时，根据重构信号和从ADPCM信号导出的重建误差信号，在自适应预测器中产生的预测因子系数的更新被禁止，预测器系数仅根据泄漏功能。这使得能够通过ADPCM布置来实现改进的跟踪。

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