-
公开(公告)号：CA2228240C
公开(公告)日：2002-03-26
申请号：CA2228240
申请日：1998-01-30
Applicant: LUCENT TECHNOLOGIES INC
Inventor： SUNDBERG CARL-ERIK WILHELM , CHEN BRIAN
Abstract: In a system for simulcasting digitally modulated and analog FM signals over the same FM frequency band, the effect of the analog FM signal on the digitally modulated signal in the simulcast is calculated and canceled from the latter signal before its transmission. As a result, the digital transmission is free from interference from the analog FM signal. Moreover, the digital transmission is achieved by adaptively inserting a time varying number of carriers modulated by digital data into the FM band. The carriers are selected frame by frame to control their interference with the analog FM signal. In accordance with the invention, the carriers are selected in a predetermined order, and in a preferred embodiment grouped contiguously with one another in the FM band. As a result, the rate of control information required to identify the inserted carriers to a receiver is advantageously low.
-
公开(公告)号：CA2208830C
公开(公告)日：2001-04-03
申请号：CA2208830
申请日：1997-06-25
Applicant: LUCENT TECHNOLOGIES INC
Inventor： SUNDBERG CARL-ERIK WILHELM , PAPADOPOULOS HARALABOS
Abstract: In a system for simulcasting digitally modulated and analog FM signals over the same FM frequency band, the effect of the analog FM signal on the digitally modulated signal in the simulcast is calculated and canceled from the latter signal before its transmission. As a result, the digital transmission is free from interference from the analog FM signal. Moreover, the digital transmission is designed in such a manner that the interference caused thereby to the analog FM signal is kept at a minimal level.
-
公开(公告)号：CA2300579A1
公开(公告)日：2000-09-29
申请号：CA2300579
申请日：2000-03-13
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LOU HUI-LING , SINHA DEEPEN , SUNDBERG CARL-ERIK WILHELM
IPC: H04L27/00 , H04B1/04 , H04B1/16 , H04B15/00 , H04H20/30 , H04H60/07 , H04J1/00 , H04B14/08 , H04L27/26
Abstract: In a communications system implementing, e.g., an in-band on channel AM (IBOC-AM) (also known as "hybrid IBOC-AM") scheme, multiple bit streams are used to represent an audio signal to be transmitted over one or more frequency bands including, e.g., parts of an AM frequency band for radio broadcast. These bit streams contain various and/or equivalent amounts of audio information. In an illustrative embodiment, at least one of the bit streams is a core bit stream containing core audio information. The remaining bit streams are enhancement bit streams containing enhancement audio information. The core bit stream is necessary for recovering the audio signal with minimal acceptable quality. Such quality is enhanced when the core bit stream, together with one or more of the enhancement bit streams, is used to recover the audio signal. In accordance with the invention, the AM frequency band is divided. into subbands. Each of the core and enhancement bit streams is assigned to a respective one of the subbands for transmission. The assignment is conducive to an effective treatment of interference affecting the IBOC-AM system. Other embodiments may include, e.g., communications of the multiple bit streams in accordance with the invention in an IBOC-FM system, a satellite broadcasting system, etc.
-
公开(公告)号：CA2295283A1
公开(公告)日：2000-07-27
申请号：CA2295283
申请日：2000-01-12
Applicant: LUCENT TECHNOLOGIES INC
Inventor： SUNDBERG CARL-ERIK WILHELM , SINHA DEEPEN
Abstract: The invention provides methods and apparatus for processing information, e.g., audio, video or image information, for transmission in a communication system. In an illustrative embodiment, a joint multiple program coder determines the value of a single-bit or multiple-bit criticality measure, e.g., criticality flag, in a designated interval, e.g., the duration of an audio frame, for each of the programs in a set of multiple programs to be transmitted in the system. The joint multiple program coder allocates a pool of available bits to the programs based at least in part on the determined values of the criticality measures, such that a program with a higher-valued criticality measure in the designated time interval is allocated a greater percentage of the available bits for that interval than another one of the programs with a lower-valued criticality measure. The joint multiple program coder repeats the determination and allocation operations for each of a number of time intervals, e.g., frames, such that the bit allocation can vary from interval to interval.
-
公开(公告)号：CA2217429A1
公开(公告)日：1998-05-12
申请号：CA2217429
申请日：1997-10-06
Applicant: LUCENT TECHNOLOGIES INC
Inventor： SUNDBERG CARL-ERIK WILHELM , PAPADOPOULOS HARALABOS C
IPC: H03H21/00 , H03C3/00 , H04B1/66 , H04H20/30 , H04J1/00 , H04J1/12 , H04J9/00 , H04J11/00 , H04L27/10 , H04L27/32 , H04B1/16
Abstract: In a system for simulcasting a digitally modulated signal and an analog FM signal over the same FM frequency band, the composite signal is received and applied to a conventional FM receiver, and a digital receiver in accordance with the invention. An extended Kalman filter is employed in the digital receiver to estimate the analog FM signal based on a version of the recovered FM signal from the FM receiver, and a discrete version of the composite signal whose spectrum has been translated and is at an intermediate carrier frequency. The estimated FM signal, which is in a discrete form, is subtracted from the discrete version of the composite signal. The resulting signal, which is an estimated version of the digitally modulated signal, is demodulated to recover the digital data as transmitted.
-
Patent Agency Ranking
公开(公告)号：CA2321941A1
公开(公告)日：1998-02-22
申请号：CA2321941
申请日：1997-06-25
Applicant: LUCENT TECHNOLOGIES INC
Inventor： SUNDBERG CARL-ERIK WILHELM , PAPADOPOULOS HARALABOS C
Abstract: The present invention relates to a method for use in a communications receiver. The method is comprised of receiving a data symbol corresponding to one of predetermined data symbols in a signal constellation. The method includes extending lines from an origin of the signal constellation through the predetermined data symbols therein, respectively and translating the received data symbol onto a selected one of the extended lines, the selected line being the closest to the received data symbol of all of the extended lines. Finally the method includes determining the predetermined data symbol corresponding to the translated received symbol. The invention also relates to a communications apparatus. The apparatus is comprised of a receiver for receiving a data symbol corresponding to one of predetermined data symbols in a signal constellation. A unit is provided for extending lines from an origin of the signal constellation through the predetermined data symbols therein, respectively, and a translator is provided for translating the received data symbol onto a selected one of the extended lines, the selected line being the closest to the received data symbol of all of the extended lines. A unit is provided for determining the predetermined data symbol corresponding to the translated received symbol.
-
公开(公告)号：DE69931570T2
公开(公告)日：2007-05-10
申请号：DE69931570
申请日：1999-09-21
Applicant: LUCENT TECHNOLOGIES INC
Inventor： SINHA DEEPEN , SUNDBERG CARL-ERIK WILHELM
Abstract: The invention provides methods and apparatus for processing information, e.g., audio, video or image information, for transmission in a communication system. In an illustrative embodiment, interference characteristics are determined for a set of n channels to be used to transmit audio information bits, where n is greater than or equal to two. The audio information bits are separated into n classes based on error sensitivity, for example, the impact of errors in particular audio data bits on perceived quality of an audio signal reconstructed from the transmission. The classes of bits are then assigned to the n channels such that the classes of bits having the greatest error sensitivity are transmitted over the channels which are the least susceptible to interference. The interference characteristics associated with the n channels can be determined by, for example, measuring interference levels for one or more of the channels, or obtaining information regarding known interference levels for one or more of the channels. The channels may correspond to different frequency bands, time slots, code division slots or any other type of channels. The invention can provide UEP for different classes of audio information bits even in cases in which the same convolutional code, or the same complementary punctured pair convolutional (CPPC) code pair, is used to encode the classes. The assignment of the classes of bits to the channels, as well as the characteristics of the classes and the channels, may be fixed or dynamic.
-
公开(公告)号：CA2279098C
公开(公告)日：2004-04-06
申请号：CA2279098
申请日：1999-07-29
Applicant: LUCENT TECHNOLOGIES INC
Inventor： SUNDBERG CARL-ERIK WILHELM , SINHA DEEPEN
Abstract: The invention provides methods and apparatus for processing information, e.g ., audio, video or image information, for transmission in a communication system. In a n illustrative embodiment, interference characteristics are determined for a set of n channels to be used to transmit audio information bits, where n is greater than or equal to two. Th e audio information bits are separated into n classes based on error sensitivity, fo r example, the impact of errors in particular audio data bits on perceived quality of an audio signal reconstructed from the transmission. The classes of bits are then assigned to the n channe ls such that the classes of bits having the greatest error sensitivity are transmitted over t he channels which are the least susceptible to interference. The interference characteristics associated with the n channels can be determined by, for example, measuring interference levels fo r one or more of the channels, or obtaining information regarding known interference level s for one or more of the channels. The channels may correspond to different frequency bands, time slots, code division slots or any other type of channels. The invention can provide UEP for different classes of audio information bits even in cases in which the same convolutional code, or the same complementary punctured pair convolutional (CPPC) code pair, is used to encode the classes. The assignment of the classes of bits to the channels, as well as t he characteristics of the classes a.nd the channels, may be fixed or dynamic.
-
公开(公告)号：CA2295281A1
公开(公告)日：2000-07-27
申请号：CA2295281
申请日：2000-01-12
Applicant: LUCENT TECHNOLOGIES INC
Inventor： SINHA DEEPEN , SUNDBERG CARL-ERIK WILHELM
Abstract: The invention provides methods and apparatus for decoding multiple program information, e.g., audio, video or image information, in a communication system. In an illustrative embodiment, a multiple program decoder includes a deinterleaver for deinterleaving information corresponding to a set of frames, using a specified deinterleaving length. A given one of the frames includes information from each of at least a subset of the programs, and the frames are encoded using an outer code, e.g., a CRC code, RS code, BCH code or other type of linear block code, and an inner code, e.g., a convolutional code, turbo code or trellis coded modulation. The multiple program decoder includes an inner code decoder for decoding the inner code over one or more of the programs, and an outer code decoder for decoding the outer code for a selected one of the programs. The deinterleaving length of the deinterleaver and operating rate of the inner code decoder can be configured such that the multiple program decoder provides substantially instantaneous tuning within a given cluster of programs, or within a set of clusters each including multiple programs. The programs may, but need not, include jointly-coded audio programs. The invention may be implemented in numerous applications, such as simultaneous multiple program listening and/or recording, simultaneous delivery of audio and data, etc.
-
公开(公告)号：CA2279098A1
公开(公告)日：2000-03-30
申请号：CA2279098
申请日：1999-07-29
Applicant: LUCENT TECHNOLOGIES INC
Inventor： SUNDBERG CARL-ERIK WILHELM , SINHA DEEPEN
Abstract: The invention provides methods and apparatus for processing information, e.g., audio, video or image information, for transmission in a communication system. In an illustrative embodiment, interference characteristics are determined for a set of n channels to be used to transmit audio information bits, where n is greater than or equal to two. The audio information bits are separated into n classes based on error sensitivity, for example, the impact of errors in particular audio data bits on perceived quality of an audio signal reconstructed from the transmission. The classes of bits are then assigned to the n channels such that the classes of bits having the greatest error sensitivity are transmitted over the channels which are the least susceptible to interference. The interference characteristics associated with the n channels can be determined by, for example, measuring interference levels for one or more of the channels, or obtaining information regarding known interference levels for one or more of the channels. The channels may correspond to different frequency bands, time slots, code division slots or any other type of channels. The invention can provide UEP for different classes of audio information bits even in cases in which the same convolutional code, or the same complementary punctured pair convolutional (CPPC) code pair, is used to encode the classes. The assignment of the classes of bits to the channels, as well as the characteristics of the classes and the channels, may be fixed or dynamic.
-
-
-
-
-
-
-
-
-
Search Results
56
records
(took 0.035 seconds)
