04955nam a2200457 4500 20260818090136.0 080598 th eng .b10189154 AIT Thesis no. TC-94-7 Nguyen Viet Trung The design and performance evaluation of a convolutional-code error-correction scheme for ATM networks Bangkok : Asian Institute of Technology, 1994 125 leaves Thesis ; no. TC-94-7 A thesis submitted in partial fulfillment of the requirement for the degree of Master of Engineering, School of Engineering and Technology Thesis (M.Eng.) - Asian Institute of Technology, 1994 Error control is very essential to provide services with satisfactory performance, especially in Asynchronous Transfer Mode (ATM) networks where a wide variety of applications of different traffic characteristics and performance requirements are to be handled. Real time applications such as voice, video and multimedia communications, which will be of great importance in future ATM networks, may tolerate a certain degree of error impairments but strictly need a short time delay. In such high bandwidth delay-product ATM networks, the latency introduced by retransmission based error recovery schemes may be too high· for these time constrained applications, and forward error correction becomes a more promising approach. The research presented in this thesis consists of the design and performance evaluation of an error correction scheme for real time traffics in ATM networks. The new scheme corrects bit errors and recovers lost cells by applying a convolutional code to a virtual path connection. Conventional error correction schemes for ATM real time traffics, which have been studied over the past five years, are based on linear block coding represented by cyclic codes. In the proposed scheme, a convolutional code, namely Berlekamp-Preparata convolutional (BPC) code combined with an efficient cell loss detection technique using sequence number is able to correct both random and bursty bit errors in ATM cells, especially in ATM information field, with short delay and by simple implementation, so that· not only transmission bit errors but also lost cells due to congestion or cell header error can be recovered. A mathematical model for decoding process of the BPC code is developed to obtain the code performance, which is then well verified by simulation results. Based on the BPC code performance analysis, the proposed scheme is evaluated with proper numerical values of ATM impairments. A M/D/l queueing model is used to assess the reduction of coding performance caused by increases of the link utilization rate due to coding overhead and the impact of using different coding parameters. The results show outstanding improvements in CLR and BER when the scheme is applied for a small portion (20%) of virtual paths and the link utilization is not too high. The proposed scheme is available for virtual channel connection as well. A possibility of BPC code for burst erasure decoding that can increase twice the cell loss recovery capability of the proposed scheme has not yet been studied and will be the topic for further research. Error-correcting codes (Information theory) Takahashi, Kiyoshi, Chairperson Erke, Tapio J., Examination Committee Makelainen, Kimmo, Examination Committee Finnish International Development Agency (FINNIDA), Scholarship Donor Asian Institute of Technology. Thesis ; no. TC-94-7 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B15830 .b10189154 mnait s 240716 2 951012 m a s 4 mnait mnait mnarc mnarc mnarc 20 40 Barcode : 30050003068045 CREATED : 1994-05-16 RECORD # : i10226308 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050003068052 CREATED : 1994-05-16 RECORD # : i1022631x LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050160046172 CREATED : 2016-01-03 RECORD # : i12887407 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050211018915 CREATED : 2022-03-16 RECORD # : i13373584 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050211018907 CREATED : 2022-03-16 RECORD # : i13373596 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 27013 27013 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no. TC-94-7 30050003068045 2026-08-18 09:01:36 1 2026-08-18 20 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no. TC-94-7 30050003068052 2026-08-18 09:01:36 2 2026-08-18 20 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no. TC-94-7 30050160046172 2026-08-18 09:01:36 2026-08-18 40 0 0 0 0 MAIN MAIN mnarc 2026-08-18 50.00 0 AIT Thesis no. TC-94-7 30050211018915 2026-08-18 09:01:36 3 2026-08-18 20 0 0 0 0 MAIN MAIN mnarc 2026-08-18 50.00 0 AIT Thesis no. TC-94-7 30050211018907 2026-08-18 09:01:36 4 2026-08-18 20