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1. 发明授权

US5550837A Adaptive differential pulse code modulation system with transmission error compensation 失效
标题翻译：具有传输误差补偿的自适应差分脉码调制系统
公开(公告)号：US5550837A
公开(公告)日：1996-08-27
申请号：US248143
申请日：1994-05-24
申请人： Hyokang Chang
发明人： Hyokang Chang
IPC分类号： H04B14/06 , H04L1/24 , G06F11/00
CPC分类号： H04L1/24 , H04B14/068
摘要： A codeword forcing technique is applied which provides gradual degradation of an audio output during fading such that analog degradation in a fading signal environment is simulated. The system may be used in conjunction with digital cordless telephones where gradual degradation of a 32 Kbit/s ADPCM signal is obtained by indirectly detecting a transmission bit error rate, The bit error rate detection is accomplished by sensing the occurrence of an invalid all-zero code, Codeword forcing techniques are then applied to compensate for the inaccurate transmission and associated noise level,
摘要翻译：应用码字强制技术，其在衰落期间提供音频输出的逐渐劣化，从而模拟衰落信号环境中的模拟劣化。该系统可以与数字无绳电话一起使用，其中通过间接检测传输误码率获得32Kbit / s ADPCM信号的逐渐劣化。误码率检测通过感测无效全零的发生来实现代码，然后应用码字强制技术来补偿不准确的传输和相关的噪声水平，

2. 发明授权

US07424738B2 RF firewall for a wireless network 有权
标题翻译： RF防火墙用于无线网络
公开(公告)号：US07424738B2
公开(公告)日：2008-09-09
申请号：US10896260
申请日：2004-07-21
申请人： Hyokang Chang , Ashim K Roy
发明人： Hyokang Chang , Ashim K Roy
IPC分类号： G06F9/00
CPC分类号： H04W48/02 , H04K3/41 , H04K3/42 , H04K3/43 , H04K3/44 , H04K2203/18 , H04L63/02 , H04W12/08 , H04W84/12 , H04W88/08
摘要： Limiting RF signal reception outside of a perimeter boundary to enhance security in a wireless network. A central jamming controller (CJC) communicates with one or more access points within a wireless network to determine if link activity is present within a cell controlled by a specific access point. Link activity comprises transmissions from an authorized communication device (ACD) to the access point and transmissions from the access point to the ACD. When link activity is detected, the CJC directs a jamming antenna system to produce a jamming signal and to transmit the jamming signal outside of the perimeter boundary defined by the WLAN. The jamming signal comprises noise transmitted within the bandwidth of the channel being used by the access point and the ACD to communicate within the cell. An unauthorized communication device (UCD) outside of the perimeter boundary will be prevented from receiving the communication between the access point and the ACD because of the jamming signal.
摘要翻译：限制外围边界以外的RF信号接收，以增强无线网络的安全性。中央干扰控制器（CJC）与无线网络内的一个或多个接入点进行通信，以确定在由特定接入点控制的小区内是否存在链路活动。链路活动包括从授权通信设备（ACD）到接入点的传输以及从接入点到ACD的传输。当检测到链路活动时，CJC指示干扰天线系统产生干扰信号，并将干扰信号发送到由WLAN定义的周边边界之外。干扰信号包括在由接入点使用的信道的带宽内传输的噪声，并且ACD在小区内进行通信。由于干扰信号，将阻止外围边界以外的未授权通信设备（UCD）接收接入点和ACD之间的通信。

3. 发明申请

US20050020244A1 RF firewall for a wireless network 有权
标题翻译： RF防火墙用于无线网络
公开(公告)号：US20050020244A1
公开(公告)日：2005-01-27
申请号：US10896260
申请日：2004-07-21
申请人： Hyokang Chang , Ashim Roy
发明人： Hyokang Chang , Ashim Roy
IPC分类号： H04K3/00 , H04L12/28 , H04L12/56 , H04L29/06 , H04W12/00 , H04W48/02 , H04W84/12 , H04W88/08 , H04Q7/00 , H04M1/66 , H04M1/68 , H04M3/16
CPC分类号： H04W48/02 , H04K3/41 , H04K3/42 , H04K3/43 , H04K3/44 , H04K2203/18 , H04L63/02 , H04W12/08 , H04W84/12 , H04W88/08
摘要： Limiting RF signal reception outside of a perimeter boundary to enhance security in a wireless network. A central jamming controller (CJC) communicates with one or more access points within a wireless network to determine if link activity is present within a cell controlled by a specific access point. Link activity comprises transmissions from an authorized communication device (ACD) to the access point and transmissions from the access point to the ACD. When link activity is detected, the CJC directs a jamming antenna system to produce a jamming signal and to transmit the jamming signal outside of the perimeter boundary defined by the WLAN. The jamming signal comprises noise transmitted within the bandwidth of the channel being used by the access point and the ACD to communicate within the cell. An unauthorized communication device (UCD) outside of the perimeter boundary will be prevented from receiving the communication between the access point and the ACD because of the jamming signal.
摘要翻译：限制外围边界以外的RF信号接收，以增强无线网络的安全性。中央干扰控制器（CJC）与无线网络内的一个或多个接入点进行通信，以确定在由特定接入点控制的小区内是否存在链路活动。链路活动包括从授权通信设备（ACD）到接入点的传输以及从接入点到ACD的传输。当检测到链路活动时，CJC指示干扰天线系统产生干扰信号，并将干扰信号发送到由WLAN定义的周边边界之外。干扰信号包括在由接入点使用的信道的带宽内传输的噪声，并且ACD在小区内进行通信。由于干扰信号，将阻止外围边界以外的未授权通信设备（UCD）接收接入点和ACD之间的通信。

4. 发明授权

US5347611A Apparatus and method for transparent tone passing over narrowband digital channels 失效
标题翻译：用于透过窄带数字通道的透明色调的装置和方法
公开(公告)号：US5347611A
公开(公告)日：1994-09-13
申请号：US822316
申请日：1992-01-17
申请人： Hyokang Chang
发明人： Hyokang Chang
IPC分类号： G10L11/02 , H04Q1/453 , G10L7/00 , G10L7/06
CPC分类号： G10L25/78 , H04Q1/453
摘要： A method of passing tones transparently over narrowband channels without having to detect the tones at the transmit side is described. This method requires neither separate handling of tones for the transmission purpose, nor prior knowledge of the characteristics of the signaling tones used. It is a relatively general method that can be applied to systems using a variety of speech coding techniques utilizing a frame structure.
摘要翻译：描述了在窄带信道上透明地传递音调而不必在发送侧检测音调的方法。该方法既不需要单独处理用于传输目的的音调，也不需要使用所使用的信令音的特征的先前知识。这是一种相对一般的方法，可以应用于利用帧结构的各种语音编码技术的系统。

5. 发明授权

US06996767B2 Memory configuration scheme enabling parallel decoding of turbo codes 失效
标题翻译：内存配置方案支持turbo码并行解码
公开(公告)号：US06996767B2
公开(公告)日：2006-02-07
申请号：US10211479
申请日：2002-08-02
申请人： Hyokang Chang , Seok Ho Kim
发明人： Hyokang Chang , Seok Ho Kim
IPC分类号： H03M13/00
CPC分类号： H03M13/3905 , H03M13/2957 , H03M13/3972
摘要： A memory configuration scheme that enables parallel decoding of a single block of turbo-encoded data is described. In this scheme a single code block is divided into multiple subblocks and decoding is performed on subblocks in parallel. The turbo decoder memory is configured so that subblock decoders can access the common memory resources independently of each other. This scheme is different from existing parallel decoding schemes in that it achieves the parallel implementation by applying multiple decoders to a single code block, not by assigning multiple decoders to multiple code blocks. The advantages of this scheme include minimum memory requirement and minimum decoding latency. The minimum memory requirement results from the fact that it needs memory resources only for a single code block regardless of the number of decoders used. The decoding latency is minimum since decoding of a code block is over when decoding on subblocks is completed.
摘要翻译：描述了能够并行解码单个turbo编码数据块的存储器配置方案。在该方案中，单个码块被划分为多个子块，并且对子块并行地执行解码。 turbo解码器存储器被配置为使得子块解码器可以彼此独立地访问公共存储器资源。该方案与现有的并行解码方案不同，它通过将多个解码器应用于单个码块来实现并行实现，而不是通过将多个解码器分配给多个码块。该方案的优点包括最小内存要求和最小解码延迟。最小内存要求是由于只需要单个代码块的内存资源，而不管使用的解码器数量如何。解码等待时间是最小的，因为在子块上的解码完成时，码块的解码结束。

6. 发明授权

US4476435A Digital demodulation of frequency modulated signals 失效
标题翻译：频率调制信号的数字解调
公开(公告)号：US4476435A
公开(公告)日：1984-10-09
申请号：US360735
申请日：1982-03-22
申请人： Hyokang Chang , Kishan Shenoi , Bgahwati P. Agrawal
发明人： Hyokang Chang , Kishan Shenoi , Bgahwati P. Agrawal
IPC分类号： H03D3/00 , H03M1/00 , H03K9/08
CPC分类号： H03M1/506
摘要： The digital demodulation of frequency modulated signals produces a pulse duration modulated signal proportional to the analog modulation signal component of the FM input signal from the FM input signal and a delayed version thereof and the pulse duration modulated signal is then converted to a digital signal representative of the analog modulation signal component of the FM signal by a delta sigma modulator and a decimator which also provides equalization of the FM signal to remove pre-emphasis applied to the FM signal prior to its transmission.
摘要翻译：频率调制信号的数字解调产生与来自FM输入信号的FM输入信号的模拟调制信号分量成比例的脉冲持续时间调制信号及其延迟版本，然后将脉冲宽度调制信号转换成代表 FM信号的模拟调制信号分量由Δ-Σ调制器和抽取器组成，其也提供FM信号的均衡以去除在其发送之前施加到FM信号的预加重。

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