公开(公告)号：JP2000224053A

公开(公告)日：2000-08-11

申请号：JP2000005208

申请日：2000-01-05

Applicant: LUCENT TECHNOLOGIES INC

Inventor： SINHA DEEPEN ,  SUNDBERG CARL-ERIK WILHELM

IPC: H03M13/35 ,  H04B1/00 ,  H04H20/00 ,  H04L1/00

Abstract: PROBLEM TO BE SOLVED: To perform error prevention which is higher than a program having maximum limit reference within a designated time interval by deciding the limit reference for a part of a bit stream and adopting a different convolutional code or another appropriate technique with respect to respective programs, on the basis of the corresponding limit reference. SOLUTION: A dividing device 14 divides respective bit streams B1 into two classes, i.e., a class 1 bit and a class 2 bit and stores divided bits for each divided bit stream in a buffer 16. The buffer 16 includes individual storage devices for the class 1 bit and the class 2 bit of each bit stream. Next, the classes 1 and 2 are respectively given error prevention on a different level, e.g. by the use of a different convolutional code or via another appropriate technique. The device 14 utilizes limit reference when bit distribution of the bit streams is respectively performed.

公开(公告)号：JP2000236263A

公开(公告)日：2000-08-29

申请号：JP2000018338

申请日：2000-01-27

Applicant: LUCENT TECHNOLOGIES INC

Inventor： SINHA DEEPEN ,  SUNDBERG CARL-ERIK WILHELM

IPC: G10L19/00 ,  H03M7/30 ,  H04H20/00 ,  H04L1/00

Abstract: PROBLEM TO BE SOLVED: To obtain a method for common encoding for the purpose of multi- program transmission by assigning a large rate of usable bits for a specified time interval to a program which has a high important scale value at the specified time interval. SOLUTION: A common multi-program coder decides the important scale value at the specified time interval as to the parts of bit streams from N sets of programs. Then the common multi-program coder assigns a pool of usable bit to the program according to the decided important scale value and assigns a large rate of usable bits for the specified time interval to the program having the high important scale value at the specified time interval. For example, a common multi-program audio coder 10 includes a PAC encoder bank 12, composed of PAC audio coders ENC-1 to ENC-N and a two-dimensional common bit allocator 14.

公开(公告)号：JPH11317675A

公开(公告)日：1999-11-16

申请号：JP2919399

申请日：1999-02-05

Applicant: LUCENT TECHNOLOGIES INC

Inventor： SINHA DEEPEN ,  SUNDBERG CARL-ERIK WILHELM

IPC: H03M13/00 ,  H03M13/35 ,  H04B14/04 ,  H04L1/00

Abstract: PROBLEM TO BE SOLVED: To perform uneven error protection to bits of different classes to be encoded by dividing audio data bits into classes, based on the effects of errors of the data bits set on the perceptual quality of audio signals, which are reconfigured from an audio and by securing coincidence between the error protection given to the audio data bits and error sensibility. SOLUTION: First, 2nd and 3rd codes are used at a control part 10i (class 1 bit), an audio data part 12i of level 1 (class 2 bit) and an audio data part 14i of level 2 (class 3 bit) of a PAC audio packet (i) respectively. The class 1 bit is most important and therefore protected by a code of a low rate, and the bits of classes 2 and 3 are less important in this order and therefore protected by the codes having higher rates in this order. Thus, error protection of different levels are provided to those levels respectively.

公开(公告)号：JPH11284520A

公开(公告)日：1999-10-15

申请号：JP430999

申请日：1999-01-11

Applicant: LUCENT TECHNOLOGIES INC

Inventor： CHEN BRIAN ,  SUNDBERG CARL-ERIK WILHELM

IPC: H04J11/00 ,  H03M13/23 ,  H04H20/30 ,  H04L1/00 ,  H03M13/12

Abstract: PROBLEM TO BE SOLVED: To obtain a punctured convolution code by which satisfactory performance is provided by encoding an information bit by using a group of codes including complementary codes whose values are not equivalent. SOLUTION: A digital bit stream from an audio encoder 25 is inputted in a convolutional code part 26. The bit stream is encoded to a symbol string, by the use of a pair of the complementary punctured convolutional codes by the convolutional code part 26. A rate 4/5 anterior error correcting code is used for both upper and lower side band channels in the convolutional code part 26. Namely, the codes of all bandwidth class I (rate 4/11) and a class II (rate 4/9) are generated by puncturing a rate 1/3 base code. An average rate between the classes I and II is 2/5. Half bandwidth codes (the lower side band code and the upper side band code) are generated by puncturing all the bandwidth codes. The average rate between the half band width code is 4/5.

公开(公告)号：JPH10271085A

公开(公告)日：1998-10-09

申请号：JP6564698

申请日：1998-03-16

Applicant: LUCENT TECHNOLOGIES INC

Inventor： CHEN BRIAN ,  SUNDBERG CARL-ERIK WILHELM

IPC: H04J1/00 ,  H04H20/30 ,  H04J9/00 ,  H04J11/00 ,  H04L5/02

Abstract: PROBLEM TO BE SOLVED: To increase the convenience of a simultaneous transmission system between an FM signal and a digital modulation carrier by selecting carriers inserted into an FM band in a specified order. SOLUTION: A module 116 analyzes the interference of emulated transmission while the pre-cancellation effect of the sub-set of the carriers to the FM signal is considered. The module 116 calculates the value of γaggregate , which is caused by the FM signal by the sub-set of the carriers and shows deterioration as a whole based on interference analysis. It is decided whether the value exceeds the value of γmax or not. When it does not exceed the value, the module 116 decides whether a pair of final carriers is added or not to the sub-set. In such a case, a control channel transmitting information identifying the selected pair of carriers to a receiver changes a pair of carriers selected by the module 116 at every frame. A data bit showing control information is generated by a control channel processor 119.

公开(公告)号：DE69933256D1

公开(公告)日：2006-11-02

申请号：DE69933256

申请日：1999-04-13

Applicant: LUCENT TECHNOLOGIES INC

Inventor： CHEN BRIAN ,  SUNDBERG CARL-ERIK WILHELM

IPC: H04L5/02 ,  H04B1/04 ,  H04L27/00 ,  H04B7/005 ,  H04H20/00 ,  H04J11/00 ,  H04L27/26 ,  H04L27/36 ,  H04M11/06

Abstract: In a communications system implementing an in-band on channel AM (IBOC-AM) (also known as "hybrid IBOC-AM") scheme, digitally modulated signals are transmitted in a 30 kHz digital band centered at an analog host AM carrier frequency fc. The host AM carrier is assigned to the geographic area served by the communications system for AM radio broadcast. It is likely that a similar IBOC-AM scheme is implemented in an adjacent area which is assigned a second analog host AM carrier having a frequency which is either 20 kHz higher or lower than fc. In that case, the transmission of the digitally modulated signals are interfered by a similar transmission in the adjacent area. The interference is known as "second adjacent channel interference." To reduce such interference, selected power profiles in accordance with the invention are used to allocate the relative transmission power to the digitally modulated signals in the digital band.

公开(公告)号：CA2289344C

公开(公告)日：2005-06-28

申请号：CA2289344

申请日：1999-11-10

Applicant: LUCENT TECHNOLOGIES INC

Inventor： CHEN BRIAN ,  SUNDBERG CARL-ERIK WILHELM

IPC: H03M13/00 ,  H03M13/23 ,  H03M13/41 ,  H04L1/00 ,  H04L27/26 ,  H03M13/31

Abstract: The invention provides optimal complementary punctured convolutional codes f or coding information bits in a communication system. In an illustrative embodiment, an optimal pair of complementary punctured codes is selected from a set of potential code pairs. The set of potential code pairs includes all non-catastrophic complementary punctured code pairs which combine to produce to a specified full-bandwidth code, and thus includes both equivalent and non-equivalent complementary codes. The optimal code pair may be selected, for example, as the pair of equivalent or non-equivalent codes which has the best free Hamming distance and minimum information error weight of all t he pairs in the set. In addition, the invention provides both rate-compatible and rate- incompatible codes suitable for use in providing unequal error protection (UEP) for different classes of information bits. The invention further provides optimal bit assignment techniques for use in digital audio broadcasting or other applications in which digital information is transmitted on subcarriers in both an upper and a lower sideband of an analog carrier.

公开(公告)号：CA2296138A1

公开(公告)日：2000-07-27

申请号：CA2296138

申请日：2000-01-14

Applicant: LUCENT TECHNOLOGIES INC

Inventor： SUNDBERG CARL-ERIK WILHELM ,  SINHA DEEPEN

IPC: H03M7/30 ,  H04H20/00 ,  H04L1/00 ,  H04L1/08 ,  H04H1/00 ,  H04L12/18 ,  H03M13/29

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 multiple program coder encodes a bitstream associated each of the programs, in accordance with a specified bit allocation. An outer code encoder receives the encoded bitstreams from the multiple program coder, and jointly applies an outer code, e.g., a CRC code, RS code, BCH code or other type of linear block code, to subblocks of a subset of the resulting encoded bitstreams. The outer code is applied such that subblocks of each of the encoded bitstreams in the subset of the encoded bitstreams are associated with a single outer code block. The number of subblocks associated with a given outer code block may be an integer or non-integer number of code blocks. The invention allows a designated number of program subblocks to share a given outer code block, such that outer code error flags can be generated for smaller groups of bits per program than would otherwise be possible. An inner code encoder may be used to apply an inner code, e.g., a convolutional code, turbo code or trellis coded modulation, to the resulting outer code blocks.

公开(公告)号：CA2292976A1

公开(公告)日：2000-07-05

申请号：CA2292976

申请日：1999-12-21

Applicant: LUCENT TECHNOLOGIES INC

Inventor： SINHA DEEPEN ,  SUNDBERG CARL-ERIK WILHELM

IPC: H03M13/35 ,  H04B1/00 ,  H04H20/00 ,  H04L1/00

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, the value of a single-bit or multiple-bit criticality flag is determined for each of the programs in abet of multiple programs to be transmitted in the system. The information bits for each of the programs are then separated into n classes, where n is greater than or equal to two, based on the values of the criticality flags for the programs. Each of the classes is provided with a different level of error protection, e.g., through the use of different convolutional codes or other suitable techniques. The program or programs having the highest criticality flag values in a given frame or other designated time interval thus have a larger percentage of their information bits assigned to the class that is provided with the highest level of error protection. The assignment of the multiple program bits to the classes, as well as the characteristics of the classes, may be fixed for a designated number of program frames, or dynamic, i.e., permitted to vary from frame to frame.

公开(公告)号：CA2289344A1

公开(公告)日：2000-06-21

申请号：CA2289344

申请日：1999-11-10

Applicant: LUCENT TECHNOLOGIES INC

Inventor： SUNDBERG CARL-ERIK WILHELM ,  CHEN BRIAN

IPC: H03M13/00 ,  H03M13/23 ,  H03M13/41 ,  H04L1/00 ,  H04L27/26 ,  H03M13/31

Abstract: The invention provides optimal complementary punctured convolutional codes for coding information bits in a communication system. In an illustrative embodiment, an optimal pair of complementary punctured codes is selected from a set of potential code pairs. The set of potential code pairs includes all non-catastrophic complementary punctured code pairs which combine to produce to a specified full-bandwidth code, and thus includes both equivalent and non-equivalent complementary codes. The optimal code pair may be selected, for example, as the pair of equivalent or non-equivalent codes which has the best free Hamming distance and minimum information error weight of all the pairs in the set. In addition, the invention provides both rate-compatible and rateincompatible codes suitable for use in providing unequal error protection (UEP) for different classes of information bits. The invention further provides optimal bit assignment techniques for use in digital audio broadcasting or other applications in which digital information is transmitted on subcarriers in both an upper and a lower sideband of an analog carrier.