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    • 1. 发明申请
    • ESTIMATION OF THE CFO BY TRANSMISSION OF A SINGLE SUBCARRIER SIGNAL IN OFDM SYSTEM
    • OFDM系统中单载波信号传输的CFO估计
    • WO2014128019A1
    • 2014-08-28
    • PCT/EP2014/052539
    • 2014-02-10
    • ST-ERICSSON SA
    • DHAYNI, Achraf
    • H04L27/26
    • H04L27/2657H04L27/2672H04L27/2682
    • A receiver for receiving and demodulating an OFDM signal received from an emitter (EMT), comprising receiving means adapted for demultiplexing said orthogonal frequency division multiplexing signal to generate time symbols (y l (n)) and performing a time-to-frequency transform of these time symbols to generate received symbols (Y l (k)), further comprising carrier frequency offset estimation means adapted for - receiving a single-subcarrier signal, - down/up-converting the single-subcarrier signal by the interval Δf between two subsequent frequencies of the sub-carriers of the OFDM signal, - determining said estimated carrier frequency offset from the values of the received symbols; and and carrier frequency offset compensation means for applying this estimated carrier frequency offset to the OFDM signal, so as to correct the carrier frequency of said received symbols.
    • 一种用于接收和解调从发射器(EMT)接收的OFDM信号的接收机,包括接收装置,用于对所述正交频分多路复用信号进行解复用以产生时间符号(yl(n)),并执行这些信号的时间 - 频率变换 时间符号以生成接收符号(Y1(k)),还包括适用于 - 接收单个子载波信号的载波频率偏移估计装置, - 将所述单个子载波信号的下变频/上变频由两个后续的间隔&Dgr; f OFDM信号的子载波的频率; - 从所接收的符号的值确定所述估计的载波频率偏移; 以及用于将该估计的载波频率偏移应用于OFDM信号的载波频率偏移补偿装置,以便校正所述接收符号的载波频率。
    • 6. 发明申请
    • ESTIMATION OF THE CFO BASED ON CHANNEL IMPULSE RESPONSE FOR OFDM SYNCHRONIZATION
    • 基于OFDM同步的通道脉冲响应的CFO估计
    • WO2014090592A1
    • 2014-06-19
    • PCT/EP2013/075001
    • 2013-11-28
    • ST-ERICSSON SA
    • DHAYNI, Achraf
    • H04L27/26
    • H04L27/2613H04L27/2657H04L27/2672H04L27/2675H04L27/2682
    • A receiver for receiving and demodulating an OFDM signal received from an emitter (EMT), comprising a receiving function module (RFM) adapted for demultiplexing said OFDM signal to generate time symbols (yl(n)) and performing a time-to-frequency conversion of said time symbols to generate received symbols (Y I (k)), this OFDM signal comprising synchronization signal constituted by at least a synchronization symbol corresponding to a single subcarrier, and data signal constituted of data symbols; the receiving function module (RFM) being further adapted to receive said synchronization signal during a period substantially longer that the transmission period of said data symbols; and the receiver (RCV) further comprising a carrier frequency offset estimator (CFOE) having: - A computing circuitry (DV) for determining an estimated carrier frequency offset (ε̑) according to the frequency difference between the frequency (m) of said single subcarrier and the frequency (m' corresponding to a peak within said received symbols (Y l (k)); - A frequency correction module (FC) for applying this estimated carrier frequency offset (ε̑) to said time symbols, so as to correct the carrier frequency of the received symbols.
    • 一种用于接收和解调从发射器(EMT)接收的OFDM信号的接收机,包括适于分离所述OFDM信号以产生时间符号(yl(n))并执行时间 - 频率转换的接收功能模块(RFM) 的所述时间符号以生成接收符号(YI(k)),该OFDM信号包括由至少与单个子载波相对应的同步符号构成的同步信号和由数据符号构成的数据信号; 所述接收功能模块(RFM)进一步适于在所述数据符号的传输周期大大长的时间段期间接收所述同步信号; 并且所述接收器(RCV)还包括载波频率偏移估计器(CFOE),所述载波频率偏移估计器(CFOE)具有: - 计算电路(DV),用于根据所述频率(m)之间的频率差来确定估计载波频率偏移(& 单个子载波和与所述接收符号(Y1(k))中的峰值相对应的频率(m'); - 频率校正模块(FC),用于将所估计的载波频率偏移(&egr;̑)应用于所述时间符号, 以校正接收到的符号的载波频率。
    • 7. 发明申请
    • SYMBOL TIME OFFSET CORRECTION VIA INTERCARRIER INTERFERENCE DETECTION IN OFDM RECEIVER
    • 通过OFDM接收机中的帧间干扰检测的符号时间偏移校正
    • WO2014044651A1
    • 2014-03-27
    • PCT/EP2013/069205
    • 2013-09-17
    • ST-ERICSSON SA
    • DHAYNI, Achraf
    • H04L27/26
    • H04L27/2665H04L25/03159H04L27/2662H04L27/2672H04L27/2675H04L27/2682H04L2025/03414
    • Receiver (RCV) adapted for compensating for Symbol Timing Offset when receiving OFDM symbols, over a communication channel (TC), comprising: means (REG, DFT, CMP) for detecting a first phase with no Inter-Symbol Interference, means (REG, DFT, CMP) for detecting a second phase with presence of Inter-Symbol Interference, means (REG, DFT, CMP) for compensating for said Symbol Timing Offset by estimating starting points of said received OFDM symbols as being one sample before the start of said second phase. The timing synchronization is achieved in frequency domain by monitoring amplitude variation of the demodulated subcarriers symbols, said variation being due to the presence of Inter Symbol Interference when the FFT window overlaps with the subsequent OFDM symbol.
    • 用于在通信信道(TC)上接收OFDM符号时补偿符号定时偏移的接收机(RCV),包括:用于检测没有符号间干扰的第一相位的装置(REG,DFT,CMP),装置(REG, DFT,CMP),用于通过存在符号间干扰来检测第二相位,用于通过将所述接收的OFDM符号的起始点估计为所述接收的OFDM符号开始之前的一个样本来补偿所述符号定时偏移的装置(REG,DFT,CMP) 第二阶段 通过监视解调的副载波符号的幅度变化,在频域中实现定时同步,所述变化是由于当FFT窗口与随后的OFDM符号重叠时存在帧间干扰。