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公开(公告)号：JP2001160768A
公开(公告)日：2001-06-12
申请号：JP2000264844
申请日：2000-09-01
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LOU HUI-LING , RUPP MARKUS
Abstract: PROBLEM TO BE SOLVED: To provide efficient calculation technology suitable for using it in channel estimation, channel equalization and other signal processing operations. SOLUTION: A signal processing operation is executed on a reception symbol system in a digital communication system receiver. Respective symbols show several information bits. The symbols correspond to points in given modulation constellations, which are generated by rotating regular modulation constellations (QPSK, 16-QAM, 64-QAM, 256-QAM and 1024-QAM) by a prescribed degree (45 degrees, for example). Thus, the specified signal processing operation such as finite impulse response(FIR) filtering, least mean square(LMS) estimation and maximum likelihood(ML) system detection by Viterbi algorithm can be executed without the need of a multiplier by using the rotated constellation.
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公开(公告)号：JP2000349825A
公开(公告)日：2000-12-15
申请号：JP2000102549
申请日：2000-04-04
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LOU HUI-LING , SCHULLER GERALD DIETRICH THOMA , WEERACKODY VIJITHA
IPC: G06F13/38 , G06F13/00 , H04L12/801 , H04L12/885 , H04L12/911 , H04N7/24 , H04N19/00 , H04N21/2343 , H04N21/438 , H04L12/56
Abstract: PROBLEM TO BE SOLVED: To obtain source coding and a receiving data buffering scheme with receivable startup delay by generating of the reproduction of a program source on the basis of the decoding of a data packet buffered by a 1st receiving buffer. SOLUTION: Decode algorithm executed by a decoder 21 includes a normal decoding method for decoding a data stream generated by normal encode algorithm executed by a coder 11 and a normal decoding method for decoding a data stream generated by a normal encode algorithm executed by a decoder 22. A selection processor 24 operates to so as to generate reproduction B (n) obtained with an original source program as a result. Then, the decoder 21 uses both outputs of receiving buffers 17 and 18 and generates the reproduction of the original source program after delay n1 has passed.
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公开(公告)号：JP2001136213A
公开(公告)日：2001-05-18
申请号：JP2000264843
申请日：2000-09-01
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LOU HUI-LING , URBANKE RUDIGER L
Abstract: PROBLEM TO BE SOLVED: To provide improved branch metric expression on the basis of a linear distance. SOLUTION: This decoder 10 decoding a received symbol sequence has a branch metric calculation(BMC) unit 12, an addition comparison selection(ACS) unit 14 and a trace back unit 16. The unit 12 calculates a branch metric related to transition between multistage trellis representation states of a state machine. Each branch metric corresponds to a linear distance between a given received symbol and its most adjacent code word in a given trellis stage. The unit 14 utilizes a branch metric on the current stage together with a previously generated path metric for comparison in the case of finding a survival path to the current stage of a multistage trellis and a corresponding update path metric. The unit 16 utilizes the update path metric and generates a corresponding decoded output.
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公开(公告)号：JP2000244429A
公开(公告)日：2000-09-08
申请号：JP2000037109
申请日：2000-02-15
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LOU HUI-LING , SAYEED ZULFIQUAR , WEERACKODY VIJITHA
IPC: H04B7/185 , H04B7/216 , H04H20/57 , H04H40/90 , H04J11/00 , H04J13/00 , H04L1/00 , H04H1/00 , H04H1/04
Abstract: PROBLEM TO BE SOLVED: To eliminate the need of waiting time length corresponding to the comparatively long interleave length of a main program channel and to avoid large delay until the reproduction of a program by installing a tuning channel whose interleave length is set to be shorter than the main program channel. SOLUTION: A code division multiplex(CDM) satellite broadcasting system 100 has a first satellite 110 and a second satellite 120 operating at a broadcasting mode. The CDM satellite broadcasting system 100 has plural ground repeaters like a ground repeater 140 as an option. In the DM satellite broadcasting system 100, tuning channels reducing delay when a moving receiver 150 is tuned to a selected program channel at first are installed in accordance with respective program channels. In the tuning channels, interleaving length shorter than a corresponding main program channel is used in the case of an interleave processing.
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公开(公告)号：JP2001144732A
公开(公告)日：2001-05-25
申请号：JP2000316100
申请日：2000-10-17
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LOU HUI-LING , SUNDBERG CARL-ERIK WILHELM
Abstract: PROBLEM TO BE SOLVED: To restore a data packet lost during transmission while reducing delay in decoding almost half the conventional technique practice without performing a complicated mathematical operation. SOLUTION: In the case of encoding a series of data packets showing continuous information streams, this method encodes a transmitted 1st data packet so as to construct the encoded 1st data packet with a 1st set of payload information showing the 1st part of the information streams, encodes a 2nd data packet following the 1st data packet so as to construct the encoded data packet with a 2nd set of payload information showing a 2nd part following the 1st part and further makes the encoded 2nd data packet so as to include an additional set of payload information that shows only the 1st part of the information streams but does not show the other parts.
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Patent Agency Ranking
公开(公告)号：JP2002009635A
公开(公告)日：2002-01-11
申请号：JP2001107884
申请日：2001-04-06
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CHUNG SAE-YOUNG , LOU HUI-LING
Abstract: PROBLEM TO BE SOLVED: To provide a technology for generating error flags with respect to a digital audio broadcast(DAB) system and other types of digital communication systems. SOLUTION: The device generates an error flag used for source coding of a source coded bit stream, that is transmitted through a channel of a communication system. The source coded bit stream is subjected to channel coding by at least one channel code, a soft decision channel decoder decodes the channel code and generates one reliability criterion or more, with respect to a received part of the source coded bit stream and a designated part of the received part of the source coded bit stream. Different detection performances are employed for different received parts of the source coded bit stream, and a receiver can revise the detection performances dynamically. The source decoder uses the error flat to start an error reduction/concealment algorithm.
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公开(公告)号：JP2001352357A
公开(公告)日：2001-12-21
申请号：JP2001106868
申请日：2001-04-05
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CHUNG SAE-YOUNG , LOU HUI-LING
Abstract: PROBLEM TO BE SOLVED: To provide a communication system where optimum performance can be realized in an application of a DAB(digital audio broadcast) system adopting the IBOC-AM(in-band on-channel amplitude modulation) system and other communication system with a limited bandwidth. SOLUTION: A series of information bits are divided into parts of bits and they relate to levels different from each other in terms of multiplex level coding. At least one code is applied to an information bit of each level in a designated subset among all level sets, the information bit with respect to the level in the designated subset is coded and information bits with respect to levels in subsets that are not designated are not coded. In order to select a transmission modulation symbol in the communication system, both the information bits that are coded and the information bits that are not coded are utilized. This invention attains a configuration where the coding gain is enhanced from that of a conventional technology and an inequality error can be protected similarly to the case with that of time diversity in the transmission through a channel.
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公开(公告)号：JP2001203588A
公开(公告)日：2001-07-27
申请号：JP2000349289
申请日：2000-11-16
Applicant: LUCENT TECHNOLOGIES INC
Inventor： ANAND RAGHAVAN , LOU HUI-LING , PODILCHUK CHRISTINE IRENE
Abstract: PROBLEM TO BE SOLVED: To avoid a problem of excess overhead due to a tail bit required for termination of a sub block in a conventional ununiform error protection(UEP) technology while avoiding error propagation in a channel decoder. SOLUTION: The UEP is provided to a source coded bit stream 200 by a puncturing of a channel code. The channel code has a designated rate relating to a corresponding error protection level and is used for the purpose of coding a 1st part 202 of the source coded bit stream 200. Then the channel code is punctured for at least a 2nd part 204 of the source coded bit stream 200 so as to obtain a rate higher than the designated rate. The start of the puncturing is intentionally delayed by an amount decided on the basis of at least partially the memory of the channel code.
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公开(公告)号：JP2000324183A
公开(公告)日：2000-11-24
申请号：JP2000089509
申请日：2000-03-28
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LOU HUI-LING , SINHA DEEPEN , SUNDBERG CARL-ERIK WILHELM
Abstract: PROBLEM TO BE SOLVED: To treat an adjacent channel interference by including the information different from the display other than the digital displays into the information included in one of digital displays which include the signal information and transmitting every display via its allocated frequency band. SOLUTION: A C stream showing the minimum core audio information is transmitted via a sub-band 303 that is set between (fc-5) kHz and (fc+5) kHz and has resistance to a 2nd adjacent channel interference. An E1 stream showing the 1st strengthened audio information is transmitted via a sub-band 305 set between (fc-15) kHz and (fc-5) kHz, and an E2 stream showing the 2nd strengthened audio information is transmitted via a sub-band 307 set between (fc+5) kHz and (fc+15) kHz. Both E1 and E2 streams suffer the 2nd adjacent channel interference. The minimum core audio information is strengthened by the E1 or E2 stream according to whether the sub-bands 305 and 307 are significantly affected by the 2nd adjacent channel interference or not.
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公开(公告)号：DE60000319D1
公开(公告)日：2002-09-19
申请号：DE60000319
申请日：2000-03-28
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LOU HUI-LING , SCHULLER GERALD DIETRICH THOMA , WEERACKODY VIJITHA
IPC: G06F13/38 , G06F13/00 , H04L49/9023 , H04N7/24 , H04N19/00 , H04N21/2343 , H04N21/438 , H04L29/06 , H04N7/26
Abstract: A method and apparatus which reduces the start-up delay that may occur when switching programs in audio and/or video streaming applications while maintaining high quality steady-state performance thereof. A program source (e.g., an audio and/or video data stream) is encoded and transmitted as two or more separate bit streams (e.g., sequences of data packets), the transmission of one of these bit streams being delayed by a given amount of time relative to the transmission of the other bit stream(s). At the receiving end of the transmission channel, the two or more bit streams are buffered by receive buffers having different sizes (thereby resulting in different time delays when the contents thereof are decoded), wherein the time delay difference corresponds (inversely) to the relative delay times prior to transmission. Advantageously, either a multiple descriptive source coding scheme or an embedded coding scheme may be employed, in which at least one of the individual bit streams is sufficient to obtain a satisfactory decoded signal, but wherein the addition of the other bit stream(s) will improve the quality of the decoded signal. Alternatively, the data streams may comprise multiple encodings of the program source having different bit rates, wherein the lower bit rate encodings are transmitted with the correspondingly larger delays.
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