公开(公告)号：US20080205538A1

公开(公告)日：2008-08-28

申请号：US12034723

申请日：2008-02-21

申请人： Shuangfeng HAN ,  Seong-Taek Hwang ,  Han-Lim Lee

发明人： Shuangfeng HAN ,  Seong-Taek Hwang ,  Han-Lim Lee

IPC分类号： H04B7/12

CPC分类号： H04L1/20 ,  H04B7/0443 ,  H04L1/0618 ,  Y02D70/444

摘要： A method for Symbol Error Rate (SER) approximation of an SER-based transmission power allocation operation for an Orthogonal Space Time Block Code in a DWCS equipped with multiple transmission Distributed Antennas (DA) geographically dispersed at random. The method for SER approximation includes the steps of: setting multiple combinable antenna subsets from the multiple DAs; selecting a quasi-optimal antenna subset Ag (1≦g≦2n−1) having a quasi-optimal power allocation weight wg based on predetermined power allocation, for each of the set multiple antenna subsets; and calculating an SER approximation value of the selected quasi-optimal antenna subset by applying a Probability Density Function (PDF) of a Signal-to-Noise Ratio (SNR) to the OSTBC SER having symbol constellation of a predetermined modulation scheme. The output of the SER approximation value can be output to a transmitter, or to a space-time encoder of a central processor for optimal power transmission.

摘要翻译： 一种用于在配备有随机分布的多传输分布式天线（DA）的DWCS中的正交空间时间块码的基于SER的发射功率分配操作的符号误码率（SER）近似方法。 SER近似的方法包括以下步骤：从多个DA设置多个可组合天线子集; 选择具有准最优功率分配权重w（g）的准最优天线子集A 1（1 <= G 2 = 基于预定功率分配，对于所设置的多个天线子集中的每一个; 以及通过将具有信号噪声比（SNR）的概率密度函数（PDF））应用于具有预定调制方案的符号星座图的OSTBC SER来计算所选择的准最佳天线子集的SER近似值。 SER近似值的输出可以输出到中央处理器的发射机或时空编码器，以实现最佳的功率传输。

公开(公告)号：US20070127931A1

公开(公告)日：2007-06-07

申请号：US11607701

申请日：2006-12-01

申请人： Hoon Kim ,  Sung-Kee Kim ,  Han-Lim Lee ,  Seong-Taek Hwang

发明人： Hoon Kim ,  Sung-Kee Kim ,  Han-Lim Lee ,  Seong-Taek Hwang

IPC分类号： H04B10/04 ,  H04B10/12

CPC分类号： H04B10/40

摘要： Disclosed is an optical transceiver module for modulating a binary signal into an optical signal and outputting the optical signal. In one aspect, the optical transceiver module comprises a tap for dividing a binary signal into first and second binary signals, a laser source for frequency-modulating the first binary signal divided by the tap, and an intensity modulator for modulating the second binary signal divided by the tap and the frequency-modulated signal of the laser source into a phase-inverted optical signal.

摘要翻译： 公开了一种用于将二进制信号调制成光信号并输出​​光信号的光收发模块。 一方面，光收发器模块包括用于将二进制信号分成第一和第二二进制信号的抽头，用于对由分接头划分的第一二进制信号进行频率调制的激光源和用于调制分频的第二二进制信号的强度调制器 通过抽头和激光源的调频信号变为相位反转的光信号。

公开(公告)号：US20070046836A1

公开(公告)日：2007-03-01

申请号：US11504858

申请日：2006-08-16

申请人： Sung-Kee Kim ,  Seong-Taek Hwang ,  Byung-Jik Kim ,  Sang-Ho Kim ,  Gyu-Woong Lee ,  Jae-Hoon Lee ,  Yong-Gyoo Kim ,  Han-Lim Lee ,  Hoon Kim

发明人： Sung-Kee Kim ,  Seong-Taek Hwang ,  Byung-Jik Kim ,  Sang-Ho Kim ,  Gyu-Woong Lee ,  Jae-Hoon Lee ,  Yong-Gyoo Kim ,  Han-Lim Lee ,  Hoon Kim

IPC分类号： H04N5/50

CPC分类号： H04B10/2575

摘要： Disclosed is an ROF link apparatus for selecting an IF band in order to process various service signals through an MMF, which including transmitters for receiving the service signals, performing IF modulation for the service signals, and transferring the modulated IF signals, a first controller for scanning frequency characteristics of the MMF, searching for flat frequency bands, and transferring information regarding the flat frequency band, thereby controlling IF modulation to be performed, a link unit for combining the IF signals with output signals of the first controller, converting the combined signals into optical signals, transmitting the optical signals, converting the optical signals into electrical signals, and splitting the electrical signals, a second controller for receiving the output signals of the first controller, detecting information regarding the flat frequency band, and transferring the information to receivers, thereby controlling modulation to be performed, and the receivers for receiving the IF modulated signals, receiving the information from the second controller, and performing RF modulation.

摘要翻译： 公开了一种用于选择IF频带以便通过MMF处理各种服务信号的ROF链路装置，该MMF包括用于接收服务信号的发射机，对服务信号执行IF调制，以及传送调制的IF信号，第一控制器 MMF的扫描频率特性，搜索平坦频带，以及传送关于平坦频带的信息，由此控制要执行的IF调制;用于将IF信号与第一控制器的输出信号组合的链路单元，转换组合信号 传输光信号，将光信号转换为电信号，分割电信号;第二控制器，用于接收第一控制器的输出信号，检测关于平坦频带的信息，以及将信息传送到接收机 ，从而控制要进行的调制 用于接收IF调制信号的接收机，从第二控制器接收信息，并执行RF调制。

公开(公告)号：US07060970B2

公开(公告)日：2006-06-13

申请号：US10688496

申请日：2003-10-17

申请人： Hee-Won Cheung ,  Seong-Taek Hwang ,  Han-Lim Lee ,  Byung-Chang Kang

发明人： Hee-Won Cheung ,  Seong-Taek Hwang ,  Han-Lim Lee ,  Byung-Chang Kang

IPC分类号： H01J40/14 ,  H01J7/24

CPC分类号： H01L31/02027 ,  H02M3/156

摘要： Disclosed is a temperature-compensating device for an APD optical-receiver system using an APD (Avalanche Photo Diode). The device includes a temperature-compensating circuit which employs a digital potentiometer capable of linear compensation through data look-up in compensating the decrease in gain caused by the temperature change of the APD.

摘要翻译： 公开了一种使用APD（雪崩光电二极管）的APD光接收机系统的温度补偿装置。 该装置包括温度补偿电路，其采用能够通过数据查找线性补偿的数字电位器来补偿由APD的温度变化引起的增益的降低。

公开(公告)号：US20050053384A1

公开(公告)日：2005-03-10

申请号：US10806548

申请日：2004-03-23

申请人： Sung-Kee Kim ,  Han-Lim Lee ,  Seong-Taek Hwang

发明人： Sung-Kee Kim ,  Han-Lim Lee ,  Seong-Taek Hwang

IPC分类号： H03M5/14 ,  H04B10/516 ,  H04B10/54 ,  H04B10/548 ,  H04B10/556 ,  H04B10/588 ,  H04B10/61 ,  H04L25/497 ,  H04B10/04

CPC分类号： H04B10/505 ,  H04B10/5055 ,  H04B10/5167

摘要： A duo-binary encoder performs a parallel processing and an optical duo-binary transmission apparatus using the encoder to enhance transmission capability. The duo-binary encoder has a judgment unit for judging whether an odd number or even number of ‘0’s exists in data input signals of N channels, a toggle unit for toggling an output signal of the judgment unit when a number of ‘0’s is even, an intermediate signal generation unit for determining whether phases of other channels are shifted or not, according to an data input signal on the basis of a predetermined channel of the N channels. A phase division unit divides data into a first data group having non-shifted phases and a second group of data that require a phase shift, according to an output signal of the intermediate signal generation unit and the data input signal. The divided first and second data groups are then output.

摘要翻译： 二进制编码器使用编码器执行并行处理和光二进制传输装置，以增强传输能力。 二进制编码器具有判断单元，用于判断N个通道的数据输入信号中是否存在奇数或偶数的“0”，当“0”为偶数时，用于切换判断单元的输出信号的触发单元 根据N个信道的预定信道，根据数据输入信号，确定是否移位了其他信道的相位的中间信号生成部。 相位分割单元根据中间信号产生单元的输出信号和数据输入信号将数据划分成具有非移相的第一数据组和需要相移的第二组数据。 然后输出分割的第一和第二数据组。

公开(公告)号：US07120848B2

公开(公告)日：2006-10-10

申请号：US10358535

申请日：2003-02-05

申请人： Yong-Deok Kim ,  Yun-Je Oh ,  Jun-Ho Koh ,  Han-Lim Lee ,  Byung-Jik Kim ,  Chan-Youl Kim

发明人： Yong-Deok Kim ,  Yun-Je Oh ,  Jun-Ho Koh ,  Han-Lim Lee ,  Byung-Jik Kim ,  Chan-Youl Kim

IPC分类号： H03M13/00

CPC分类号： H04L1/0047

摘要： The provided forward error correction (FEC) apparatus for a transmission system includes a low pass filter (LPF) passing only a low frequency component of an input signal having a predetermined transmission rate; an AC power meter converting an energy value of an signal output from the LPF into a DC voltage value; a logarithm amplifier converting the exponentially varying DC voltage value from the AC power meter into a linear logarithmically varying DC voltage value; a digital signal processor (DSP) determining the transmission rate of the input signal according to a magnitude of the linear DC voltage value and outputting a control signal according to the transmission rate; a clock generator receiving the control signal and generating a clock signal according to the control signal; and a FEC module receiving the clock signal and performing FEC operation on the received signal. A method for FEC is also provided.

摘要翻译： 所提供的用于传输系统的前向纠错（FEC）装置包括仅通过具有预定传输速率的输入信号的低频分量的低通滤波器（LPF）; 将从LPF输出的信号的能量值转换为DC电压值的AC功率计; 对数放大器将来自AC功率计的指数变化的DC电压值转换成线性对数变化的DC电压值; 数字信号处理器（DSP），根据线性DC电压值的大小确定输入信号的传输速率，并根据传输速率输出控制信号; 接收所述控制信号并根据所述控制信号产生时钟信号的时钟发生器; 以及FEC模块，接收时钟信号并对接收到的信号执行FEC操作。 还提供了一种用于FEC的方法。