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    • 2. 发明公开
    • 적응형 OSIC-SD 복호기 및 그를 이용한 복호방법
    • 自适应OSIC(有序连续干扰消除)-SD(SPHERE DECODER)解码器及其解码方法
    • KR1020120033762A
    • 2012-04-09
    • KR1020100095461
    • 2010-09-30
    • 엘지이노텍 주식회사전남대학교산학협력단
    • 안정욱조인식황인태서창우
    • H03M13/37H04B7/08H04J11/00H04B7/04
    • H03M13/37H04B7/0413H04B7/08H04J11/00
    • PURPOSE: An adaptive OSIC(Ordered Successive Interference Cancellation)-SD(Sphere Decoder) and a decoding method using the same are provided to greatly reduce the complexity of a conventional SD by reducing an operation amount of a decoder. CONSTITUTION: A receiving unit(210) receives a signal from the outside through an antenna. The receiving unit changes a received signal into a form suitable for decoding. A channel estimating unit(220) estimates a channel of a receiving symbol based on the signal converted through the receiver. A decoding unit(230) decodes the receiving symbol estimated by the channel estimating unit in an OSIC(Ordered Successive Interference Cancellation) decoding method or a SD(Sphere Decoder) decoding method according to a SNR(Signal-To-Noise Ratio) range. The decoding unit comprises a MMSE(Minimum Mean Square Error) decoder finding a coordinate position of the receiving symbol estimated by the channel estimating unit, an OSIC decoder decoding the receiving symbol passing the MMSE decoder according to the SNR range, and a Chan-Lee SD(Sphere Decoder) decoder.
    • 目的:提供自适应OSIC(有序连续干扰消除)-SD(球体解码器)和使用其的解码方法,以通过减少解码器的操作量来大大降低传统SD的复杂度。 构成:接收单元(210)通过天线从外部接收信号。 接收单元将接收到的信号改变成适于解码的形式。 信道估计单元(220)基于通过接收机转换的信号来估计接收符号的信道。 解码单元(230)根据SNR(信噪比)范围,以OSIC(有序连续干扰消除)解码方法或SD(球体解码器)解码方式对由信道估计单元估计的接收符号进行解码。 解码单元包括MMSE(最小均方误差)解码器,其找到由信道估计单元估计的接收符号的坐标位置,OSIC解码器根据SNR范围解码通过MMSE解码器的接收符号,以及Chan-Lee SD(球体解码器)解码器。
    • 3. 发明公开
    • 무선 통신 시스템에서의 SNR 추정방법
    • 在无线通信系统中估计SNR(信噪比)的方法
    • KR1020120033761A
    • 2012-04-09
    • KR1020100095460
    • 2010-09-30
    • 엘지이노텍 주식회사전남대학교산학협력단
    • 안정욱황인태조인식서창우
    • H04L27/26H04W24/08H04L12/26H04L1/24
    • H04L25/0226H04L27/2695H04L1/248H04L43/00H04W24/08
    • PURPOSE: A method for estimating a SNR(Signal To Noise Ratio) in a wireless communication system is provided to accurately estimate a SNR without a channel estimation process by using a preamble which a receiver and a transmitter of an IEEE 802.11n system know in common. CONSTITUTION: Transmission signal power estimation is performed with a predetermined algorithm for estimating a SNR(Signal To Noise Ratio). Noise power is obtained by using an average absolute value of the differences between two received preambles. The SNR is estimated in fixed transmission power through the relative change of noise power. An algorithm for estimating the SNR is expressed in a predetermined expression relation. Each SNR estimation algorithm uses a preamble made into two consecutive OFDM symbol sizes consisting of BPSK(Binary Phase Shift Keying) or QPSK(Quadrature Phase Shift Keying).
    • 目的:提供一种用于估计无线通信系统中的SNR(信噪比)的方法,以通过使用IEEE 802.11n系统的接收机和发射机知道的前导码来准确地估计SNR而不进行信道估计处理 。 构成:以用于估计SNR(信噪比)的预定算法执行发送信号功率估计。 通过使用两个接收的前导码之间的差异的平均绝对值来获得噪声功率。 通过噪声功率的相对变化估计固定发射功率的SNR。 用于估计SNR的算法以预定表达式关系表示。 每个SNR估计算法使用由BPSK(二进制相移键控)或QPSK(正交相移键控)组成的两个连续OFDM符号大小的前同步码。
    • 4. 发明公开
    • 직교 주파수 분할 다중 접속 시스템에서의 CQI 피드백 제어방법
    • OFDMA(正交频分多址接入)系统中的CQI(信道质量指示符)反馈控制方法
    • KR1020120041326A
    • 2012-05-02
    • KR1020100102736
    • 2010-10-21
    • 엘지이노텍 주식회사전남대학교산학협력단
    • 안정욱황인태조인식서창우
    • H04J11/00
    • H04L1/0026H04L27/2646
    • PURPOSE: A method for controlling CQI(Channel Quality Indicator) feedback in an OFDMA(Orthogonal Frequency Division Multiple Access) system is provided to reduce the overhead bit number of CQI feedback information by adapting a basic Huffman compression technique to a full-band CQI technique and a Best M Individual technique. CONSTITUTION: SINR(Signal-to-Interference and Noise Ratio) values of each received PRB(Physical Resource Block) are mapped with CQI(Channel Quality Indicator) values(S110). The frequency probability of each CQI value is obtained to be matched with the frequency number of the CQI value according to the mapping(S120). A Huffman code for the frequency probability of an obtained CQI value is configured(S130). The feedback of the CQI value to a transmitting end is controlled based on a configured Huffman code(S140).
    • 目的:提供一种用于控制OFDMA(正交频分多址)系统中的CQI(信道质量指示符)反馈的方法,以通过将基本的霍夫曼压缩技术适应全频带CQI技术来减少CQI反馈信息的开销比特数 和最佳M个人技术。 构成:每个接收的PRB(物理资源块)的SINR(信号与干扰和噪声比)值被映射为CQI(信道质量指示符)值(S110)。 根据映射,获得每个CQI值的频率概率与CQI值的频率数相匹配(S120)。 配置获得的CQI值的频率概率的霍夫曼代码(S130)。 基于配置的霍夫曼码来控制CQI值对发送端的反馈(S140)。
    • 5. 发明授权
    • 적응형 OSIC-SD 복호기 및 그를 이용한 복호방법
    • - 自适应OSIC有序连续干扰消除 - SDsphere解码器解码和解码方法使用相同
    • KR101679429B1
    • 2016-12-06
    • KR1020100095461
    • 2010-09-30
    • 엘지이노텍 주식회사전남대학교산학협력단
    • 안정욱조인식황인태서창우
    • H03M13/37H04B7/08H04J11/00H04B7/04
    • 본발명은적응형 OSIC-SD 복호기및 그를이용한복호방법에관한것으로서, 복호기의연산량을줄여종래 SD의복잡도를현저하게줄일수 있는적응형 OSIC-SD 복호기및 그를이용한복호방법을제공하고자한다. 본발명에따른적응형 OSIC-SD 복호기는, 외부로부터의신호를안테나를통해수신하고, 수신된신호를복호화에적합한형태로변환하는수신부; 상기수신부를통해변환된신호를바탕으로수신심볼의채널을추정하는채널추정부; 및상기채널추정부에의해추정된수신심볼을 SNR 범위에따라 OSIC 복호방식또는 SD 복호방식으로복호화하는복호부를포함한다. 이와같은본 발명에의하면, 낮은 SNR 범위에서큰 복잡도를갖는종래 SD(Sphere Decoder) 대신에 OSIC(ordered successive interference cancellation) 복호기를사용함으로써복호기의연산량을줄여종래 SD의복잡도를현저하게줄일수 있는장점이있다.
    • 目的:提供自适应OSIC(有序连续干扰消除)-SD(球体解码器)和使用其的解码方法,以通过减少解码器的操作量来大大降低常规SD的复杂度。 构成:接收单元(210)通过天线从外部接收信号。 接收单元将接收到的信号改变成适于解码的形式。 信道估计单元(220)基于通过接收机转换的信号来估计接收符号的信道。 解码单元(230)根据SNR(信噪比)范围,以OSIC(有序连续干扰消除)解码方法或SD(球体解码器)解码方式对由信道估计单元估计的接收符号进行解码。 解码单元包括MMSE(最小均方误差)解码器,其找到由信道估计单元估计的接收符号的坐标位置,OSIC解码器根据SNR范围解码通过MMSE解码器的接收符号,以及Chan-Lee SD(球体解码器)解码器。