公开(公告)号：EP2210356A1

公开(公告)日：2010-07-28

申请号：EP08802858.4

申请日：2008-10-10

申请人： Rohde & Schwarz GmbH & Co. KG

发明人： MEIER, Niclas ,  BALZ, Christoph

IPC分类号： H04J3/06 ,  H04L7/02

CPC分类号： H04J3/0632 ,  H03L7/085 ,  H03L7/0991 ,  H03L2207/50

摘要： The apparatus for preventing fluctuations in a digitally produced output clock signal contains a digital clock generator (19), a buffer (29), a filling-level measuring device (28) and a regulator (21). The buffer (29) stores a digital signal received with an input clock signal and outputs it with an output clock signal. The filling-level measuring device (28) measures the filling level of the buffer (29). The regulator (21) uses the filling level of the buffer (29) to regulate the frequency of the digitally produced output clock signal. The discrepancy between the input clock signal and the output clock signal is the disturbance variable for the regulation. The apparatus also contains a compensation device (16) which performs an additional coarse estimation of the disturbance variable for the regulation and uses it to pre-compensate for the output clock signal.

公开(公告)号：EP2206305A1

公开(公告)日：2010-07-14

申请号：EP08802822.0

申请日：2008-10-08

申请人： Rohde & Schwarz GmbH & Co. KG

发明人： BALZ, Christoph ,  GALDA, Dirk ,  SCHMIDT, Kurt

IPC分类号： H04L27/26

CPC分类号： H04L27/2695 ,  H04J11/0063 ,  H04L27/2607 ,  H04L27/2665 ,  H04L27/2678 ,  H04L27/2688

摘要： The device for the synchronization of received signals (60) using orthogonal frequency-multiplex transmission methods determines the channel transmission function (86) from the received signal (60) of a plurality of transmitted known pilot symbols using a channel transmission function determination device (62). From this, a channel pulse response determination device (64) determines the channel pulse response (88). To this end, a transmitted signal has at least one transmission frame and each transmission frame has at least one guard interval. The channel pulse response of the transmission channel contains several time-delayed components. Each possible synchronization time corresponds precisely to one position of the guard interval relative to the channel pulse response. The metric determination device (65) forms a metric for all possible synchronization times, which are dependent on the output of the channel pulse response within the respective guard interval. The metric maximization device (66) determines the correct synchronization time (68) of the received signal (60) by maximizing the metric.

摘要翻译： 使用正交频分复用传输方法对接收信号（60）进行同步的装置使用信道传输功能确定装置（62）从多个传输的已知导频符号的接收信号（60）中确定信道传输函数（86） ）。 由此，信道脉冲响应确定装置（64）确定信道脉冲响应（88）。 为此，传输的信号具有至少一个传输帧，并且每个传输帧具有至少一个保护间隔。 传输信道的信道脉冲响应包含几个时间延迟分量。 每个可能的同步时间恰好对应于保护间隔相对于信道脉冲响应的一个位置。 度量确定装置（65）形成所有可能的同步时间的度量，这取决于相应保护间隔内的信道脉冲响应的输出。 度量最大化设备（66）通过最大化度量来确定接收信号（60）的正确同步时间（68）。

公开(公告)号：EP2140639A1

公开(公告)日：2010-01-06

申请号：EP08707739.2

申请日：2008-02-15

申请人： Rohde & Schwarz GmbH & Co. KG

发明人： GALDA, Dirk ,  SCHMIDT, Kurt ,  BALZ, Christoph

IPC分类号： H04L25/02

CPC分类号： H04L25/0236 ,  H04L25/0232 ,  H04L27/2655

摘要： The invention relates to a method and device for determining an unabbreviated channel impulse response (h≈n) in an OFDM transmission system, the duration of which is greater than the length (NG) of the guard interval, estimating the channel transmission factor (Hn,k) in the frequency time positions (n,k) of a rougher frequency time (NF,ND), interpolating the channel transmission factor (Hn,k) in the frequency time positions (n,k) of a finer frequency time grid, and calculating the unabbreviated channel impulse response (h≈n) by means of inverse Fourier transformation from the estimated or interpolated values (H^n,ϰ, H^n,k) of the channel transmission factor (Hn,k) in the frequency time positions (n,k) of the finer frequency time grid. For this purpose, optimized estimated values (H≈n,k) of the channel transmission factor (Hn,k) are determined in the individual frequency time positions (n,k) of the finer frequency time grid from receiving symbols (Rn,k) and from sending symbols (S∼n,k,S≈n,k) that are estimated by means of a decision from the receiving symbols (Rn,k).

公开(公告)号：EP1685668A1

公开(公告)日：2006-08-02

申请号：EP04790677.1

申请日：2004-10-20

申请人： Rohde & Schwarz GmbH & Co. KG

发明人： HOFMEISTER, Martin ,  BALZ, Christoph

IPC分类号： H04H3/00

CPC分类号： H04H20/67

摘要： The invention relates to a method which monitors carrier frequency stability (ωi) of identical transmitter signals (si (t) ) in several transmitters Si of a common wave network. Said method is based on a calculation of carrier frequency displacement (ΔωI) of carrier frequency (ωi) in a transmitter (Si) in relation to carrier frequency (ω0) in a reference transmitter (S0). The phase displacement difference (ΔΔθi (tB2-tB1) ) caused by carrier frequency displacement (Δωi) between phase displacement (Δωi (tB1) ) is determined in order to form a moment of observation (tB1), and phase displacement (Δθi (tB2) ) is determined at a second moment of observation (tB2) of a received signal (ei (t)) in the transmitter (Si) associated with the respective transmitter signal (si (t) ) in order to form a received signal (e0(t)) of the reference transmitter (S0) associated with the reference transmitter signal (s0(t)).

公开(公告)号：EP1685668B1

公开(公告)日：2011-12-14

申请号：EP04790677.1

申请日：2004-10-20

申请人： Rohde & Schwarz GmbH & Co. KG

发明人： HOFMEISTER, Martin ,  BALZ, Christoph

IPC分类号： H04H20/67

CPC分类号： H04H20/67

摘要： The invention relates to a method which monitors carrier frequency stability (ωi) of identical transmitter signals (si (t) ) in several transmitters Si of a common wave network. Said method is based on a calculation of carrier frequency displacement (ΔωI) of carrier frequency (ωi) in a transmitter (Si) in relation to carrier frequency (ω0) in a reference transmitter (S0). The phase displacement difference (ΔΔθi (tB2-tB1) ) caused by carrier frequency displacement (Δωi) between phase displacement (Δωi (tB1) ) is determined in order to form a moment of observation (tB1), and phase displacement (Δθi (tB2) ) is determined at a second moment of observation (tB2) of a received signal (ei (t)) in the transmitter (Si) associated with the respective transmitter signal (si (t) ) in order to form a received signal (e0(t)) of the reference transmitter (S0) associated with the reference transmitter signal (s0(t)).

公开(公告)号：EP1749406B1

公开(公告)日：2009-08-19

申请号：EP05740434.5

申请日：2005-04-28

申请人： Rohde & Schwarz GmbH & Co. KG

发明人： BALZ, Christoph

IPC分类号： H04N17/00

CPC分类号： H04N17/004 ,  H04H20/12

摘要： A method and device evaluating the quality (Qs) of a signal by virtue of the deviation (

公开(公告)号：EP1665592A2

公开(公告)日：2006-06-07

申请号：EP04764614.6

申请日：2004-08-30

申请人： Rohde & Schwarz GmbH & Co. KG

发明人： BALZ, Christoph ,  HOFMEISTER, Martin

IPC分类号： H04H3/00

CPC分类号： H04H20/67 ,  H04B7/2625 ,  H04N5/04 ,  H04N5/4401 ,  H04N17/004 ,  H04N21/4302 ,  H04N21/44209 ,  H04N21/6112

摘要： The invention relates to a method for monitoring the time synchronisation of a total of n emitters (2, 3, 4, 5, 6, 7, 8) in a common wave network (1). According to said network, a reference total pulse response (30) that belongs to the transmission channels of the n emitters (2,:3, 4, 5, 6, 7, 8) of the common wave network (1) is compared with a measured total pulse response (52) belonging to the transmission channels of the n emitters (2, 3, 4, 5, 6, 7, 8) of the common wave network (1). A reference pulse response (20) is fixed in the reference total pulse response (30) in relation to the pilot pulse response (29), on the basis of which the remaining reference pulse responses (21, 22, 23, 24, 25, 26, 27, 28) are referenced, in order to classify all of the synchronisation errors occurring in the common wave network (1) into a plurality of synchronisation error categories.

公开(公告)号：EP1547293A1

公开(公告)日：2005-06-29

申请号：EP03750560.9

申请日：2003-09-17

申请人： Rohde & Schwarz GmbH & Co. KG

发明人： BALZ, Christoph ,  HOFMEISTER, Martin

IPC分类号： H04L1/20

CPC分类号： H04L1/206

摘要： The invention concerns a method for determining the phase and/or amplitude noise spectrum of a digitally modulated input signal (S). Said method comprises the following steps: generating (S100) real complex samples (Areal [n]), by digitally sampling the phase components (I) and the phase quadrature component (Q) of said input signal (S) in baseband; determining (S101) ideal complex samples (Aideal [n]) from the generated real samples (Areal [n]); establishing complex quotients (ΔA1 [n] =Areal [n] / Aideal[n]) from the real complex samples (Areal[n]) and the ideal complex samples (Aideal [n] ); generating (S106) modified complex quotients (B[n]) by assigning the value 1 to said complex quotients; and subjecting (S107) the modified complex quotients (B[n]) to a Fourier transform. The invention also concerns a similar method for determining the amplitude noise spectrum of said digitally modulated input signal.

公开(公告)号：EP1125390A1

公开(公告)日：2001-08-22

申请号：EP99947417.4

申请日：1999-09-23

申请人： Rohde & Schwarz GmbH & Co. KG

发明人： WOLF, Peter ,  BALZ, Christoph

IPC分类号： H04L1/20 ,  H04L27/26

CPC分类号： H04L27/2647

摘要： The invention relates to a method for displaying the mean modulation error MERRMS of a multiple carrier (OFDM) signal in which: a) The square of the error vector is calculated according to the relation (I) for each actual modulation symbol I of each individual carrier k of the multiple carrier signal; b) this value mk is offset with the content of a storage location of a memory, said storage location being assigned to the same carrier k, which comprises the same number of storage locations as the OFDM signal carrier, according to relation (II) (iteration formula) with A2k,l+1: new measured value (instant l+1) which should be filed in storage location k of the memory A2; A2k,l: previous measured value (instant l) from storage location k of memory A2; mk: Actual measured error square for carrier k; k: Carrier number within the OFDM spectrum, grows with the frequency, k=0 ... Kmax; l: number of the symbol, grows with time, 0≤l; c) the mean modulation error MERRMS is subsequently calculated for each carrier from these values of the storage locations according to relation (III), whereby VM is the quadratically weighted mean value of the amplitude of all ideal signal states of the modulation type, used each time, of a carrier modulated with useful data, and finally, d) this MERRMS value is then graphically represented with the number of the carriers as an abscissa for each individual carrier k as an ordinate value of a diagram.

公开(公告)号：EP1125377B2

公开(公告)日：2011-04-20

申请号：EP99948847.1

申请日：1999-09-23

申请人： Rohde & Schwarz GmbH & Co. KG

发明人： LAUTERJUNG, Jürgen ,  BALZ, Christoph

IPC分类号： H04B7/08 ,  H04L1/06 ,  H04L27/26

CPC分类号： H04L27/2647 ,  H04B7/0845 ,  H04L1/06

摘要： The aim of the invention is to process OFDM signals which are simultaneously received via a multiple antenna system having a plurality of separate receive channels. To this end, the channel correction values or the confidence values are determined in the receive channels for each carrier of the OFDM signal while using known techniques. In addition, the I/Q values of each individual carrier of the OFDM signal which are obtained in the OFDM demodulator are weighted with these channel correction values or confidence values. Afterwards, the I/Q values weighted in such a manner are totaled.