公开(公告)号：US20020152440A1

公开(公告)日：2002-10-17

申请号：US10045125

申请日：2001-10-26

发明人： Ilan Yona ,  Moshe Elbaz

IPC分类号： G08C025/00 ,  H03M013/00 ,  G06F011/30 ,  G06F011/00 ,  H04L001/00 ,  H04L012/56 ,  H04L012/28

CPC分类号： H04N21/6437 ,  H04N19/61 ,  H04N19/89 ,  H04N19/895 ,  H04N21/4346 ,  H04N21/4788 ,  H04N21/64776

摘要： A network interface unit is provided with a missing packets repair logical unit, which repairs real time video transmissions by replacing the missing packets. The missing packets repair unit detects and replaces missing packets in a received video stream. The missing packets can be detected by finding packets that are out of sequence.

摘要翻译： 网络接口单元具有丢失的分组修复逻辑单元，其通过替换丢失的分组来修复实时视频传输。 丢失的数据包修复单元检测并替换接收到的视频流中丢失的数据包。 可以通过查找不完整的数据包来检测丢失的数据包。

公开(公告)号：US20020046378A1

公开(公告)日：2002-04-18

申请号：US09941388

申请日：2001-08-28

申请人： Oki Techno Centre (Singapore) Pte Ltd

发明人： Hiroki Sugimoto ,  Tingwu Wang ,  Kai Ren Tan ,  Ping Xie

IPC分类号： H04L001/00 ,  G06F011/00 ,  G06F011/30 ,  H03M013/00 ,  G08C025/00

CPC分类号： H03M13/6583 ,  H03M13/2903 ,  H03M13/2957 ,  H03M13/2993 ,  H03M13/3922 ,  H03M13/3927 ,  H03M13/3961 ,  H03M13/6362 ,  H03M13/658 ,  H04L1/005 ,  H04L1/0052 ,  H04L1/0055 ,  H04L1/0066 ,  H04L1/0068 ,  H04L1/0071

摘要： Adders each add up an addition value sent from a metric calculator and a state metric read from a memory. A maximum value selector generates a first likelihood when a data bit is 1, based on the addition values added up by the adders. A maximum value selector generates a second likelihood when a data bit is 0, based on the addition values added up by the adders. A subtracter subtracts the second likelihood from the first likelihood to generate a likelihood ratio, and a subtracter subtracts data from the likelihood ratio and generates extrinsic information. A re-normalizer multiplies the extrinsic information by a predetermined value to re-normalize it and temporarily stores it in a memory. The extrinsic information stored in the memory is used as the prior probability information for the next iterative decoding.

摘要翻译： 加法器每个都加上从度量计算器发送的加法值和从内存读取的状态度量。 当数据位为1时，最大值选择器根据由加法器相加的相加值产生第一似然。 基于由加法器相加的相加值，当数据位为0时，最大值选择器产生第二似然。 减法器从第一似然率中减去第二似然值以产生似然比，减法器从似然比中减去数据并产生外在信息。 重新规范化器将外在信息乘以预定值以对其进行重新规范化并将其临时存储在存储器中。 存储在存储器中的外在信息被用作下一次迭代解码的先验概率信息。

公开(公告)号：US20020016939A1

公开(公告)日：2002-02-07

申请号：US09891493

申请日：2001-06-26

发明人： Jean-Luc Bonifas

IPC分类号： G06F011/00 ,  H04L001/00 ,  G06F011/30 ,  H03M013/00 ,  G08C025/00

CPC分类号： H04L1/203 ,  H04L1/0009 ,  H04L1/0026

摘要： The invention relates to a receiver which forms part of a communication system and receives data frames through a communication channel which is subject to disturbances, said receiver carrying out an estimation of the maximum error rate and minimum error rate caused by the communication channel. The receiver in a first time period verifies the validity of the received data frames so as to detect and identify the received erroneous data frames and the received correct data frames. Subsequently, the receiver proceeds to correct those received erroneous data frames which can be corrected, so as to generate corrected data frames. The erroneous bits are detected through a bit-by-bit comparison of the erroneous data frames 302 and the corresponding corrected data frames 303, which are added together and then averaged over the total number of bits nb_total_bits received by the receiver so as to obtain a minimum error rate for the transmission. The invention also enables an estimation of a maximum value for the error rate of the received data by adding together the number of bits contained in those data frames 301 which cannot be corrected.

摘要翻译： 本发明涉及形成通信系统的一部分的接收机，并且通过经受干扰的通信信道接收数据帧，所述接收机执行由通信信道引起的最大误码率和最小误码率的估计。 第一时间段中的接收机验证接收的数据帧的有效性，以便检测和识别所接收的错误数据帧和接收到的正确数据帧。 随后，接收机继续纠正那些可以被校正的错误数据帧，以产生经校正的数据帧。 通过对错误数据帧302和对应的校正数据帧303进行逐位比较来检测错误比特，这些校正数据帧303相加在一起，然后在接收机接收的总数nb_total_bits中进行平均，从而获得 传输的最小错误率。 本发明还能够通过将包含在不能校正的那些数据帧301中的比特数相加在一起来估计接收数据的错误率的最大值。