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公开(公告)号：EP1064741A1
公开(公告)日：2001-01-03
申请号：EP99942624.0
申请日：1999-02-24
CPC分类号： H04H20/30 , H03M13/235 , H03M13/25 , H03M13/35 , H03M13/6375 , H04H2201/20 , H04L1/0059 , H04L1/0071 , H04L5/0007 , H04L5/0046 , H04L5/0058 , H04L27/2602 , H04L2001/0098
摘要： A broadcasting method encodes program material using convolutional codes having non-puncturable bits and puncturable bits and modulates orthogonal frequency division multiplexed carrier signals with the convolutional codes. The non-puncturable bits are carried by a first group of the carriers and the puncturable bits are carried by a second group of the carriers, where the first group of carrier signals is less susceptible to interference than the second group of carrier signals. The carrier signals are then broadcast to receivers which determining if the carriers in the second group have been corrupted and erase puncturable bits carried by any of the carriers which have been determined to be corrupted. This produces punctured codes which are subsequently decodes to recover the program material.
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公开(公告)号：EP1969758A2
公开(公告)日：2008-09-17
申请号：EP06837439.6
申请日：2006-11-13
发明人： KROEGER, Brian, W. , WANG, Kun
IPC分类号： H04L7/02
CPC分类号： H04L27/2662 , H04H20/36
摘要： A method for symbol tracking in AM in-band on-channel radio receivers comprises the steps of: receiving a stream of time domain samples; assembling a set of the time domain samples equal to a symbol time plus a half symbol delay in response to a symbol timing adjustment value for each symbol period; interpolating the time domain samples; partitioning the interpolated time domain samples into a first group of samples representing half-off symbols and a second group of samples representing on-time symbols; processing the first and second groups of samples to produce the symbol timing adjustment value; and outputting the second group of samples representing on-time symbols at a symbol rate. An apparatus that performs the method is also included.
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公开(公告)号：EP1961175A1
公开(公告)日：2008-08-27
申请号：EP06837373.7
申请日：2006-11-10
发明人： KROEGER, Brian, W. , WANG, Kun
IPC分类号： H04L27/00
CPC分类号： H04L27/0014 , H04H2201/186 , H04L2027/003 , H04L2027/0055 , H04L2027/0069
摘要： A method for carrier tracking in AM in-band on-channel radio receivers comprises the steps of receiving an input signal, generating a local oscillator signal in response to an oscillator control signal, mixing the input signal with a local oscillator signal to produce a first signal, filtering the first signal to produce a filtered first signal at a decimated sample rate, detecting the phase error and frequency error of the filtered first signal normalized to mitigate effects of signal fades, and using an adaptive loop filter to produce the oscillator control signal in response to the phase error and frequency error of the filtered first signal. An apparatus that performs the method is also provided.
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4.发明公开METHOD AND APPARATUS FOR PULSE OVERLAP PRE-COMPENSATION IN DIGITALLY MODULATED SIGNALS 审中-公开方法和装置IMPULSÜBERLAPPUNGSVORKOMPENSATION在数字调制信号
公开(公告)号：EP1456991A1
公开(公告)日：2004-09-15
申请号：EP02794173.1
申请日：2002-12-06
CPC分类号： H04H60/07 , H04H20/36 , H04L25/03343 , H04L27/2627 , H04L2025/03414
摘要： A method of pre-compensating for pulse overlap in a digitally modulated signal comprises the steps of receiving a sequence of pulses, (62) modulating the first sequence of pulses to produce a first sequence of demodulated pulses, (68) demodulating the first sequence of modulated pulses to produce a first sequence of demodulated pulses, (70) combining the first sequence of demodulated pulses with the first sequence of pulses to produce a first sequence of error pulses, (74) modulating the first sequence of error pulses to produce a first sequence of modulated error pulses, and (78) combining the first sequence of modulated error pulses with the first sequence of modulated pulses to produce a first sequence of compensated pulses.
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公开(公告)号：EP1969758B1
公开(公告)日：2010-10-27
申请号：EP06837439.6
申请日：2006-11-13
发明人： KROEGER, Brian, W. , WANG, Kun
IPC分类号： H04L7/02
CPC分类号： H04L27/2662 , H04H20/36
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6.发明公开ADJACENT CHANNEL INTERFERENCE MITIGATION FOR FM DIGITAL AUDIO BROADCASTING RECEIVERS 审中-公开干扰缓解相邻信道之间的数字音频FM无线电接收器
公开(公告)号：EP1500195A1
公开(公告)日：2005-01-26
申请号：EP03718466.0
申请日：2003-04-21
发明人： KROEGER, Brian, W.
CPC分类号： H04H60/11 , H04H20/30 , H04H2201/183 , H04H2201/20
摘要： A method of receiving an FM digital audio broadcasting signal including a first plurality of sub-carriers in a lower sideband of the radio channel comprises the steps of mixing the digital audio broadcasting signal with a local oscillator signal (112) to produce an intermediate frequency signal (114) through a bandpass filter (116) to produce a filter signal, determining if one of the upper and lower sidebands of the digital audio broadcasting signal is corrupted, and adjusting the local frequency oscillator signal (112) to change the frequency of the intermediate frequency (114) signal such that the bandpass filter (116) removes the sub-carriers in the upper or lower sideband that has been corrupted. A receiver that processes a digital audio broadcasting signal in accordance with the method is also provided.
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公开(公告)号：EP1949587A2
公开(公告)日：2008-07-30
申请号：EP06837438.8
申请日：2006-11-13
发明人： KROEGER, Brian, W. , WANG, Kun
CPC分类号： H04L27/01 , H04H20/30 , H04H40/18 , H04L5/023 , H04L25/03159 , H04L27/2601 , H04L27/2647 , H04L2025/03414 , H04L2025/03439
摘要： A method is provided for equalizing OFDM symbol vectors received on AM in-band on-channel radio signal including a main carrier and first and second BPSK modulated subcarriers. The method comprises the steps of: computing a BPSK magnitude signal; filtering the BPSK magnitude signal; filtering complex samples received on the main carrier; using the filtered BPSK magnitude signal and the filtered complex samples received on the main carrier to compute a plurality of flat fade equalization coefficients; and multiplying the OFDM symbol vectors by the flat fade equalization coefficients. A receiver that includes an equalizer, which operates in accordance with the method is also provided.
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8.发明公开DIGITAL AUDIO BROADCASTING METHOD AND APPARATUS USING COMPLEMENTARY PATTERN-MAPPED CONVOLUTIONAL CODES 审中-公开数字音频广播方法及其装置互补码MUSTERABGEBILDETEN电路
公开(公告)号：EP1502357A1
公开(公告)日：2005-02-02
申请号：EP03718471.0
申请日：2003-04-21
发明人： KROEGER, Brian, W.
CPC分类号： H04L1/006 , H03M13/25 , H03M13/256 , H03M13/3761 , H03M13/6387 , H04L1/0069 , H04L1/007 , H04L1/0071 , H04L5/0007 , H04L5/0046
摘要： A method of transmitting digital information uses the steps of forward error correction coding (56) a plurality of bits of digital information (54) using complementary pattern-mapped convolutional codes, modulating (62) a plurality of carrier signals with the forward error correction coded bits, and transmitting (76) the modulated carrier signals. The modulation can include the step of independently amplitude shift keying the in-phase and quadrature components of the QAM constellation using Gray codes corresponding to amplitude levels. Receivers for such signals are also described.
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公开(公告)号：EP1451923A1
公开(公告)日：2004-09-01
申请号：EP02791359.9
申请日：2002-12-05
CPC分类号： H04H60/07 , H04H20/36 , H04H2201/20 , H04L27/2647
摘要： A method for pre-compensating an analog signal in a composite digital audio broadcasting signal including the analog signal and a plurality of digitally modulated sub-carrier signals, the method comprising the steps of sampling (62) the analog signal to obtain successive blocks of samples, demodulating (64) each of the blocks of samples to obtain a plurality of demodulator outputs, remodulating (68) the demodulator outputs that correspond to the predetermined ones of the digitally modulated sub-carrier signals to produce an error signal, subtracting the error signal from the one of the blocks of samples to produce a pre-compensated block of samples, and combining the pre-compensated block of samples with a plurality of OFDM pulses to produce a compensated composite signal. An apparatus for performing the method is also included.
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公开(公告)号：EP1064741B1
公开(公告)日：2003-12-10
申请号：EP99942624.0
申请日：1999-02-24
CPC分类号： H04H20/30 , H03M13/235 , H03M13/25 , H03M13/35 , H03M13/6375 , H04H2201/20 , H04L1/0059 , H04L1/0071 , H04L5/0007 , H04L5/0046 , H04L5/0058 , H04L27/2602 , H04L2001/0098
摘要： A broadcasting method encodes program material using convolutional codes having non-puncturable bits and puncturable bits and modulates orthogonal frequency division multiplexed carrier signals with the convolutional codes. The non-puncturable bits are carried by a first group of the carriers and the puncturable bits are carried by a second group of the carriers, where the first group of carrier signals is less susceptible to interference than the second group of carrier signals. The carrier signals are then broadcast to receivers which determining if the carriers in the second group have been corrupted and erase puncturable bits carried by any of the carriers which have been determined to be corrupted. This produces punctured codes which are subsequently decodes to recover the program material.
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