公开(公告)号：US20030031231A1

公开(公告)日：2003-02-13

申请号：US10083119

申请日：2002-02-27

Applicant: Korea Electronics Technology Institute

Inventor： Young-Hwan You ,  Cheol-Hee Park ,  Min-Chul Ju ,  Kee-Hyun Park ,  Jin-Woong Cho

IPC: H04B001/707

CPC classification number: H04B1/715 ,  H04B1/7143 ,  H04B2001/7154

Abstract: The present invention relates to an adaptive frequency hopping apparatus in a wireless personal area network (WPAN) system, wherein predetermined packets of data can be correctly transmitted by estimating the channel qualities of operating bands in advance and transmitting the packets through a proper band. The adaptive frequency hopping apparatus according to the present invention comprises a frequency table for monitoring each channel quality and storing and outputting information on each channel quality accumulated therein, a frequency hopping transceiver for generating and outputting a frequency pattern in accordance with predetermined rules, a link controller for generating an asynchronous connectionless (ACL) link in accordance with output signals of the frequency table and the frequency hopping transceiver and controlling selection of an operating mode between a channel avoidance scheme and a channel selection scheme, a packet handler for generating packet data by integrating a synchronous connection oriented (SCO) link and the ACL link inputted thereinto, a gaussian frequency shift keying (GFSK) modulator for performing GFSK modulation for signals outputted from the packet handler, a mode selector for selecting the operating mode between the channel avoidance scheme and the channel selection scheme in accordance with output signals of the frequency hopping transceiver and the link controller, a frequency synthesizer for synthesizing frequencies in accordance with output signals of the mode selector, a first multiplier for multiplying signals from outputted from the frequency synthesizer and the GFSK modulator and for outputting the multiplied signals as transmission signals, a second multiplier for multiplying the output signals of the frequency synthesizer by received signals, an RSSI detector for detecting a RSSI from output signals of the second multiplier, a GFSK demodulator for performing GFSK demodulation for the output signals of the second multiplier, a packet handler for restoring packet-type data from output signals of the GFSK demodulator, and a channel quality detector for estimating the channel quality by using the output signals of the RSSI detector and the packet handler, and storing it in the frequency table.

公开(公告)号：US20040146116A1

公开(公告)日：2004-07-29

申请号：US10649647

申请日：2003-08-28

Applicant: Korea Electronics Technology Institute

Inventor： Sung-Jin Kang ,  Jin-Woong Cho ,  Cheol-Hee Park ,  Min-Chul Ju ,  Dae-Ki Hong ,  Kyeung-Hak Seo ,  Myoung-Jin Kim

IPC: H04K001/10 ,  H04L027/28

CPC classification number: H04J13/004 ,  H04J13/0077 ,  H04L1/0041 ,  H04L1/0061

Abstract: A constant amplitude coded bi-orthogonal demodulator demodulates the received constant amplitude bi-orthogonal modulated data, cancels the parity bits to generate the serial data, detects the occurrence of an error by dividing the demodulated data into a plurality of groups of data, outputs the serial data as demodulated data if an error does not occur, sequentially converts bit polarities of data of groups in which an error occurs if the error detector detects the error, compares distances between the received bi-orthogonal modulated data and the constant amplitude coded bi-orthogonal modulated data, and selects, as demodulated data, data of which corresponding bit polarities are changed according to the comparison results. According to the present invention, power consumption is reduced, a power amplifier can be manufactured at an inexpensive cost, interference robustness can be ensured, and data can be transmitted at a high transmission rate and a variable transmission rate.

Abstract translation: 一个恒定幅度编码的双正交解调器对接收到的恒幅双正交调制数据进行解调，取消奇偶校验位以产生串行数据，通过将解调数据分成多组数据来检测出错， 作为解调数据的串行数据如果不发生错误，则顺序地转换误差检测器检测到错误时发生错误的组的数据的位极性，比较接收到的双正交调制数据与恒幅编码的双向正交调制数据之间的距离， 正交调制数据，并根据比较结果选择相应位极性改变的数据作为解调数据。 根据本发明，能够降低能耗，能够以廉价的成本制造功率放大器，能够确保干扰稳定性，能够以高传输速度和可变传输速率传输数据。