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1. 发明专利

CA2306111A1 PCM MODEM EQUALIZER WITH ADAPTIVE COMPENSATION FOR ROBBED BIT SIGNALLING 未知
公开(公告)号：CA2306111A1
公开(公告)日：1999-04-29
申请号：CA2306111
申请日：1998-10-14
申请人： PCTEL INC
发明人： GOLDSTEIN YURI , MAIZENBERG VAL , HANNA WILLIAM
IPC分类号： H04L25/03 , H04L25/49 , H04B1/38 , H04L27/01 , H04L5/16 , H04B10/18
摘要： A PCM modem equalizer (130) includes an RBS estimator and decision modulator (150) in conjunction with an adaptive equalizer such as a conventional decision feedback equalizer (DFE) (131, 132, 134, 136, 139, 140). The RBS estimator and decision modulator (150) receive error signals from the second summer (136) in the equalizer, receive the estimated R signals from the first summer (134) of the equalizer, and output a gain correction signal which is applied (152) to the output of the reference generator (137) before the reference generator output is applied to the feedback equalizer (140) and the second summer (136). The methods of the invention are based on the recognition that the effects of RBS can be detected in the amplitude modulation of the main training sequence stream. The modulation will occur in a periodic repetitive pattern of length 6*T where T is the symbol interval. Therefore, the invention applies a corrective gain to the decision in each time slot in a periodic manner having the same period 6*T.

2. 发明专利

AU6359600A Method and apparatus for data transmission 未知
公开(公告)号：AU6359600A
公开(公告)日：2001-02-13
申请号：AU6359600
申请日：2000-07-13
申请人： PCTEL INC
发明人： DRUCKER VITALY , GOLDSTEIN YURI , HANNA WILLIAM , OKUNEV YURI
IPC分类号： H04J11/00 , H04L1/08 , H04L27/26 , H04L27/28 , H04B1/38 , H04K1/10

3. 发明专利

CA2378177A1 METHOD AND APPARATUS FOR DATA TRANSMISSION 未知
公开(公告)号：CA2378177A1
公开(公告)日：2001-02-01
申请号：CA2378177
申请日：2000-07-13
申请人： PCTEL INC
发明人： OKUNEV YURI , HANNA WILLIAM , GOLDSTEIN YURI , DRUCKER VITALY
IPC分类号： H04J11/00 , H04L1/08 , H04L27/26 , H04L27/28 , H04B1/38 , H04K1/10
摘要： A method of providing a high bit rate DMT signal includes providing information on a plurality of DMT tones, with at least two of the plurality of DMT tones sending information in parallel. Of the tones sending information in parallel, at least one has a SNR too low to be individually used for the number of bits it is transmitting. Accordingly, the tones are coherently "combined" at the receiver in order to generate a SNR sufficient together to carry, at the desired BER, the number of bits being transmitted in parallel. Two or more tones which alone cannot carry a single bit of information may b e used together to provide a sufficient SNR at the receiver to transmit one or more bits. Similarly, two or more tones which alone cannot carry two bits of information, may be used together via parallel transmission to provide a sufficient SNR at the receiver. Further, the bit-carrying capacity of a firs t tone which can carry one or more bits may be increased by transmitting an increased number of bits in parallel with one or more additional tones which cannot carry any bits of information. According to another embodiment of the invention, rather than sending two or more DMT tones in parallel, one or mor e DMT tones are repeated over a plurality of DMT symbols, and "combined" coherently in order to generate a SNR sufficient together to carry the numbe r of bits being carried by the repeated tone.

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