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1. 发明专利

CA2360774A1 TRANSLATION TABLE DESIGN FOR A PCM MODEM 未知
公开(公告)号：CA2360774A1
公开(公告)日：2000-08-03
申请号：CA2360774
申请日：2000-01-18
申请人： PCTEL INC
发明人： DRUCKER VITALY , OKUNEV YURI , WANG QIN , GOLDSTEIN YURI
IPC分类号： H03M7/50 , H04B14/04 , H04J3/12 , H04L25/49 , H04B1/38 , H04L23/00 , H04L23/02 , H04L27/04 , H04L27/10 , H04L27/20 , H04L27/36
摘要： Methods are provided for generating at least one translation table for a mod em having a frame having a plurality of slots. DIL sequence information from another is used to generate ordered table of levels (15), and distances (20) between adjacent levels of the ordered table (15) found for each slot. The distances (20) are used to distinguish between slots subject to robbed bit signaling (RBS) and slots not subject to RBS (25), and the ordered tables (1 5) are used to make a determination as to whether the DIL sequence information is A-law or .mu.-law information. Scaling factors are generated from the A- law/.mu.-law determination as well as from a PAD estimation, and the scaling factors (80) are utilized in generating translation tables (100a, 100b). A P AD estimation function is utilized in finding the PAD estimation.

2. 发明专利

AU2509000A Distinguishing received a-law and mu-law signals in a pcm modem 未知
公开(公告)号：AU2509000A
公开(公告)日：2000-08-18
申请号：AU2509000
申请日：2000-01-18
申请人： PCTEL INC
发明人： OKUNEV YURI , DRUCKER VITALY , WANG QIN , GOLDSTEIN YURI
IPC分类号： H03M7/50 , H04B14/04 , H04J3/12 , H04L25/49 , H04B1/38 , H04L23/02 , H04L27/10 , H04L27/04 , H04L27/36 , H04L27/20 , H04L23/00
摘要： A method in a modem having a frame having a plurality of slots, for determining whether incoming DIL sequence information contains A-law or mu-law information is provided. From the DIL sequence information, an ordered table of levels for each slot is generated. The levels of all non-robbed-bit slots are averaged, and average levels are subjected to an A-law/mu-law separation function. The separation functioneffectively compares values of a first plurality of levels L(i) to twice the values of a second plurality of levels sixteen levels removed from the first plurality of levels. The sum is compared to a threshold, as the sum will be small for A-law values and large for mu-law values.

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.

4. 发明专利

CA2308825A1 TRANSLATION TABLE AND CONSTELLATION DESIGN FOR A PCM MODEM SUBJECTED TO ALTERNATING ROBBED BIT SIGNALING 未知
公开(公告)号：CA2308825A1
公开(公告)日：2000-11-20
申请号：CA2308825
申请日：2000-05-18
申请人： PCTEL INC
发明人： GOLDSTEIN YURI , WANG QIN , DRUCKER VITALY , OKUNEV YURI
IPC分类号： H04B14/04 , H04J3/12 , H04L25/49 , H04M11/06
摘要： The receiver of a PCM modem utilizes the V.90 TRN1d training signal for detecting whether any of the six slots of the received signal may be subject to alternating robbed bit signaling (ARBS), and what the alternating robbed bit signaling pattern may be. This is accomplished by accumulating the received level over a plurality of frames for each slot and by comparing the received levels for each slot to an average level for that slot. If the difference between the received levels and the average levels exceeds a threshold, the slot is determined to be subject to ARBS. Where a slot is subject to ARBS, DIL sequence signals for frames of the alternating robbed bit signaling slot having LSB=0 and LSB=1 are accumulated separately (if available) in order to generate two translation tables (TRT0, TRT1) for that slot. Where the DIL sequence is found only in the frames having the alternating robbed bit signaling slot having LSB=0 or having LSB=1, only one translation table can be generated. Different algorithms are provided for designing a constellation for the alternating robbed bit signaling slot depending on (a) whether two translation tables were generated for the slot, (b) whether the frame-to-TRT correspondence is known, and (c) where only one translation table is generated, whether the translation table generated was TRT0 or TRT1.

5. 发明专利

AU2509300A Constellation design for a pcm modem 未知
公开(公告)号：AU2509300A
公开(公告)日：2000-08-18
申请号：AU2509300
申请日：2000-01-18
申请人： PCTEL INC
发明人： OKUNEV YURI , DRUCKER VITALY , WANG QIN , GOLDSTEIN YURI
IPC分类号： H04B14/04 , H04L25/49 , H04L27/04 , H04L23/02 , H04L27/36 , H04L27/20 , H04L27/10 , H04L23/00
摘要： Modem constellations are designed by independently optimizing for each slot of a frame, the distances between constellation points used for that slot. A maximum number of points N(0) are chosen having at least the minimum distance d0 without exceeding a power limitation Plim. Using N(0), an attempt is made to increase the d0 in the constellation without exceeding Plim. Constellations may be further optimized by, where possible, decreasing N(0) in a particular constellation without affecting the total data rate of the frame. Thus, a maximum potentially achievable data rate Rmax is calculated given the number of points which are in each of the six constellations, and comparing Rmax to a standards-permitted data rate DR; and then, if Rmax exceeds DR, by decreasing N(0) in one or more constellations, provided the decrease in the number of points does not cause a recalculated Rmax to drop below DR. Further optimization is obtained by attempting to increase d0 in one or more slots by permitting that slot(s) to exceed Plim, provided the average power of the frame is not exceeded. This is accomplished by finding the slot with the maximum error probability, increasing d0 for that slot (while maintaining N(0)) to thereby exceed frame power limitations for that slot, and checking to see whether the changes to the constellation in that slot violates the average frame power limitations. A simple system for checking average constellation power is also provided.

6. 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

7. 发明专利

AU2508900A Translation table design for a pcm modem 未知
公开(公告)号：AU2508900A
公开(公告)日：2000-08-18
申请号：AU2508900
申请日：2000-01-18
申请人： PCTEL INC
发明人： OKUNEV YURI , DRUCKER VITALY , WANG QIN , GOLDSTEIN YURI
IPC分类号： H03M7/50 , H04B14/04 , H04J3/12 , H04L25/49 , H04B1/38 , H04L23/02 , H04L27/10 , H04L27/04 , H04L27/36 , H04L27/20 , H04L23/00
摘要： Methods are provided for generating at least one translation table for a modem having a frame having a plurality of slots. DIL sequence information from another modem is used to generate ordered table of levels, and distances between adjacent levels of the ordered table for found for each slot. The distances are used to distinguish between slots subject to robbed bit signaling (RBS) and slots not subject to RBS, and the ordered tables are used to make a determination as to whether the DIL sequence information is A-law or mu-law information. Scaling factors are generated from the A-law/mu-law determination as well as from a PAD estimation, and the scaling factors are utilized in generating translation tables. A PAD estimation function is utilized in finding the PAD estimation.

8. 发明专利

CA2360780A1 CONSTELLATION DESIGN FOR A PCM MODEM 未知
公开(公告)号：CA2360780A1
公开(公告)日：2000-08-03
申请号：CA2360780
申请日：2000-01-18
申请人： PCTEL INC
发明人： DRUCKER VITALY , WANG QIN , GOLDSTEIN YURI , OKUNEV YURI
IPC分类号： H04B14/04 , H04L25/49 , H04L23/00 , H04L23/02 , H04L27/04 , H04L27/10 , H04L27/20 , H04L27/36
摘要： Modem constellations are designed by independently optimizing for each slot of a frame, the distances between constellation points used for that slot. A maximum number of points N(0) (824) are chosen having at least the minimum distance d0 without exceeding a power limitation Plim. Using N(0), an attemp t is made to increase the d0 in the constellation without exceeding Plim. Constellation may be further optimized by, where possible, decreasing N(0) (824) in a particular constellation without affecting the total data rate of the frame. Thus, a maximum potentially achievable data rate Rmax (830) is calculated given the number of points which are in each of the six constellations, and comparing Rmax to a standards-permitted data rate DR; an d then, if Rmax exceeds DR, by decreasing N(0) (824) in one or more constellations, provided the decrease in the number of points does not cause a recalculated Rmax to drop below DR. Further optimization is obtained by attempting to increase d0 in one or more slots by permitting that slot(s) to exceed Plim, provided the average power of the frame is not exceeded. This i s accomplished by finding the slot with the maximum error probability, increasing d0 for that slot (while maintaining N(0)) to thereby exceed frame power limitations for that slot, and checking to see whether the changes to the constellation in that slot violates the average frame power limitations. A simple system for checking average constellation power is also provided.

9. 发明专利

CA2360777A1 DISTINGUISHING RECEIVED A-LAW AND .MU.-LAW SIGNALS IN A PCM MODEM 未知
公开(公告)号：CA2360777A1
公开(公告)日：2000-08-03
申请号：CA2360777
申请日：2000-01-18
申请人： PCTEL INC
发明人： OKUNEV YURI , WANG QIN , DRUCKER VITALY , GOLDSTEIN YURI
IPC分类号： H03M7/50 , H04B14/04 , H04J3/12 , H04L25/49 , H04B1/38 , H04L23/00 , H04L23/02 , H04L27/04 , H04L27/10 , H04L27/20 , H04L27/36
摘要： A method in a modem having a frame having a plurality of slots, for determining whether incoming DIL sequence information contains A-law or mu-l aw is provided. From the DIL sequence information, an ordered table of levels f or each slot is generated. The levels of all non-robbed-bit slots are averaged, and average levels are subjected to an A-law/mu-law separation function. The separation function F1(n1,n2)=sum from i=n1 to i=n2 {L(i) - 2* [L(i-16]} effectively compares values of a first plurality of levels L(i) to twice the values of a second plurality of levels sixteen levels removed from the first plurality of levels (420). The sum is compared to a threshold (430), as the sum will be small for A-law values and large for mu-law values.

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