公开(公告)号：KR1020040056987A

公开(公告)日：2004-07-01

申请号：KR1020020083738

申请日：2002-12-24

Applicant: 한국전자통신연구원

Inventor： 강홍구 ,  김현재 ,  장일순 ,  김영일 ,  김기선

IPC: H04L27/26

Abstract: PURPOSE: A method for allocating sub-channels in OFDM communication and a recoding medium for storing an allocation program are provided to form a simple bit-loading algorithm by using a modulation/demodulation level as feedback information. CONSTITUTION: A base station receives modulation/demodulation levels and average receiving S/N ratios from each terminal(S1). Users are sorted according to the average receiving S/N ratios(S2). Sub-channels are selected by using the maximum modulation/demodulation level and the maximum average receiving S/N ratio after the users are sorted according to the average receiving S/N ratio(S3). The selected sub-channels are assigned to the users(S4-S7).

Abstract translation: 目的：提供一种在OFDM通信中分配子信道的方法和用于存储分配程序的记录介质，以通过使用调制/解调级别作为反馈信息形成简单的比特加载算法。 构成：基站从每个终端接收调制/解调电平和平均接收信噪比（S1）。 用户根据平均接收信噪比（S2）进行排序。 通过使用最大调制/解调级别和根据平均接收S / N比对用户进行排序后的最大平均接收S / N比来选择子信道（S3）。 所选择的子信道被分配给用户（S4-S7）。

公开(公告)号：KR1020040055073A

公开(公告)日：2004-06-26

申请号：KR1020020081663

申请日：2002-12-20

Applicant: 한국전자통신연구원 ,  학교법인연세대학교

Inventor： 성호상 ,  황대환 ,  윤대희 ,  강홍구 ,  박영철 ,  이기승 ,  정성교 ,  김경태

IPC: H04M1/00 ,  H04B1/50

CPC classification number: H04L12/66

Abstract: PURPOSE: An apparatus and a method for transmitting/receiving a wideband voice signal are provided to offer high sound quality 16 kHz sampled wideband voice signal and compatibility with an existing system. CONSTITUTION: A analyzing/filtering unit(301) receives a digital voice signal and outputs a low band voice signal having a bandwidth of 0-4 kHz of 8 kHz sampling period. A low band standard coding unit(302) receives the low band voice signal, codes it and outputs a coded low band standard signal. A low band additional coding unit(304) receives a difference between a filtered low band voice signal and a composite signal that has been decoded by a low band standard decoding unit(303) and codes them to generate a low band additional signal. An enhancement residual band coding unit(306) up-samples a composite signal obtained by combining signals outputted from the low band standard decoding unit(303) and the low band additional decoding unit(305), obtains a difference between the up-sampled signal and a voice signal inputted to the analyzing/filtering unit(301), and generates an enhancement residual band signal.

Abstract translation: 目的：提供用于发送/接收宽带语音信号的装置和方法，以提供高音质16kHz采样宽带语音信号和与现有系统的兼容性。 构成：分析/滤波单元（301）接收数字语音信号并输出​​具有8kHz采样周期的0-4kHz带宽的低频语音信号。 低频标准编码单元（302）接收低频语音信号，对其编码并输出编码的低频带标准信号。 低频带附加编码单元（304）接收滤波后的低频语音信号和由低频带标准解码单元（303）解码的复合信号之间的差，并对它们进行编码以产生低频带附加信号。 增强残差频带编码单元（306）对通过组合从低频带标准解码单元（303）和低频带附加解码单元（305）输出的信号获得的复合信号进行上采样，获得上采样信号 以及输入到分析/滤波单元（301）的语音信号，并产生增强剩余频带信号。