Pub Date : 2001-10-28DOI: 10.1109/MILCOM.2001.985775
Chiho Lee, Kwang-Eog Lee, Young-Kyun Choi, Kiseon Kim
In this paper, we analyze the effect of chip waveform on the detection performance of an energy detector in a multi-user DS/SS system. Detection performance of the partial-band detection is investigated together with the full-band detection for a DS/SS signal. In order to evaluate the detection performance of the partial-band detection, bandwidth factor and energy factor are introduced. Numerical results show that the partial-band detection strategy always produces better detection performance than the full-band detection strategy with a proper selection of partial-band detection bandwidth. In addition, among the compared three chip waveforms, such as rectangular, half-sine and raised-cosine waveform, the raised-cosine waveform; produces much lower detection probability compared with other waveforms, as the number of concurrent users increases.
{"title":"Analysis on detection performance of an energy detector for several chip waveforms in a DS/SS communication","authors":"Chiho Lee, Kwang-Eog Lee, Young-Kyun Choi, Kiseon Kim","doi":"10.1109/MILCOM.2001.985775","DOIUrl":"https://doi.org/10.1109/MILCOM.2001.985775","url":null,"abstract":"In this paper, we analyze the effect of chip waveform on the detection performance of an energy detector in a multi-user DS/SS system. Detection performance of the partial-band detection is investigated together with the full-band detection for a DS/SS signal. In order to evaluate the detection performance of the partial-band detection, bandwidth factor and energy factor are introduced. Numerical results show that the partial-band detection strategy always produces better detection performance than the full-band detection strategy with a proper selection of partial-band detection bandwidth. In addition, among the compared three chip waveforms, such as rectangular, half-sine and raised-cosine waveform, the raised-cosine waveform; produces much lower detection probability compared with other waveforms, as the number of concurrent users increases.","PeriodicalId":136537,"journal":{"name":"2001 MILCOM Proceedings Communications for Network-Centric Operations: Creating the Information Force (Cat. No.01CH37277)","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130087506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-28DOI: 10.1109/MILCOM.2001.985918
S. Moon, K. Kim
Military satellite communication can be operated with various levels of satellite onboard processing. The BER performances of the bent pipe transponder (BPT), dehop only transponder (DOT) and dehop and rehop transponder (DRT) systems with FH-MFSK modulation are compared in the presence of full-band and partial-band noise jamming and multi-tone jamming. Further, this paper investigates the BER by changing the data rates, spreading bandwidth and jamming EIRP. The numerical results show that DRT outperforms BPT and DOT and that DOT is less sensitive to uplink jamming EIRP under the full-band jamming strategy than DRT. In the partial-band jamming case, the worst case /spl rho/ (the ratio of spreading bandwidth to jamming bandwidth) is also changed according to the variation of the data rate, and the BER of DRT is more sensitive to different /spl rho/ values than DOT. Among various jamming strategies, the performance in MTJ is shown to be the worst.
{"title":"Performance of satellite communication system with FH-MFSK under various jamming environments","authors":"S. Moon, K. Kim","doi":"10.1109/MILCOM.2001.985918","DOIUrl":"https://doi.org/10.1109/MILCOM.2001.985918","url":null,"abstract":"Military satellite communication can be operated with various levels of satellite onboard processing. The BER performances of the bent pipe transponder (BPT), dehop only transponder (DOT) and dehop and rehop transponder (DRT) systems with FH-MFSK modulation are compared in the presence of full-band and partial-band noise jamming and multi-tone jamming. Further, this paper investigates the BER by changing the data rates, spreading bandwidth and jamming EIRP. The numerical results show that DRT outperforms BPT and DOT and that DOT is less sensitive to uplink jamming EIRP under the full-band jamming strategy than DRT. In the partial-band jamming case, the worst case /spl rho/ (the ratio of spreading bandwidth to jamming bandwidth) is also changed according to the variation of the data rate, and the BER of DRT is more sensitive to different /spl rho/ values than DOT. Among various jamming strategies, the performance in MTJ is shown to be the worst.","PeriodicalId":136537,"journal":{"name":"2001 MILCOM Proceedings Communications for Network-Centric Operations: Creating the Information Force (Cat. No.01CH37277)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129018985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-28DOI: 10.1109/MILCOM.2001.985940
S. A. Shah, L. Bowman
This paper presents and discusses the Defense Information Service Network (DISN) global mobile wireless networking architecture to extend the range of broadband services to mobile users available to fixed users. The roaming and mobile users will have to operate across a wide range of network performance, and choosing among alternative media and overlays for best performance. Diverse wireless and wired networks are integrated through software that mediates between the mobile terminal and the networks it could possibly connect to, supporting the mobile users as it roams among the multiple networks. The overall objective of the paper is to introduce and resolve technical issues and problems in the development of a mobile and wireless DISN network services, and answer some of the questions on the implementation of the new services and systems.
{"title":"DISN global mobile broadband wireless networking services","authors":"S. A. Shah, L. Bowman","doi":"10.1109/MILCOM.2001.985940","DOIUrl":"https://doi.org/10.1109/MILCOM.2001.985940","url":null,"abstract":"This paper presents and discusses the Defense Information Service Network (DISN) global mobile wireless networking architecture to extend the range of broadband services to mobile users available to fixed users. The roaming and mobile users will have to operate across a wide range of network performance, and choosing among alternative media and overlays for best performance. Diverse wireless and wired networks are integrated through software that mediates between the mobile terminal and the networks it could possibly connect to, supporting the mobile users as it roams among the multiple networks. The overall objective of the paper is to introduce and resolve technical issues and problems in the development of a mobile and wireless DISN network services, and answer some of the questions on the implementation of the new services and systems.","PeriodicalId":136537,"journal":{"name":"2001 MILCOM Proceedings Communications for Network-Centric Operations: Creating the Information Force (Cat. No.01CH37277)","volume":"219 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124326093","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-28DOI: 10.1109/MILCOM.2001.985924
Wenzhen Li, V. Dubey, C. Law
When power control is employed in a Ka-band LEO satellite system featured with a Markov channel, the long loop lag induces power control gaps during channel state transition, which results in long (large-scale) burst errors. To combat it, a novel hybrid ARQ scheme is proposed in this paper, in which the side information of the turbo decoder is utilized to derive the average reliability LLR/sub l/ of the desired frame based on the iterative SOVA decoding algorithm. When LLR/sub l/ is below the specified threshold, a Go-Back-N ARQ protocol is launched. With this scheme, the large-scale burst errors are effectively detected and corrected by the retransmission; the small-scale burst errors are filtered out for the interleaving and FEC coding to correct. The simulation results show that this scheme can achieve good BER performance with small cost in throughput and delay for Ka-band Markov satellite channels.
{"title":"An adaptive hybrid-ARQ scheme combating burst-errors caused by power control lag in Ka-band LEO satellite systems","authors":"Wenzhen Li, V. Dubey, C. Law","doi":"10.1109/MILCOM.2001.985924","DOIUrl":"https://doi.org/10.1109/MILCOM.2001.985924","url":null,"abstract":"When power control is employed in a Ka-band LEO satellite system featured with a Markov channel, the long loop lag induces power control gaps during channel state transition, which results in long (large-scale) burst errors. To combat it, a novel hybrid ARQ scheme is proposed in this paper, in which the side information of the turbo decoder is utilized to derive the average reliability LLR/sub l/ of the desired frame based on the iterative SOVA decoding algorithm. When LLR/sub l/ is below the specified threshold, a Go-Back-N ARQ protocol is launched. With this scheme, the large-scale burst errors are effectively detected and corrected by the retransmission; the small-scale burst errors are filtered out for the interleaving and FEC coding to correct. The simulation results show that this scheme can achieve good BER performance with small cost in throughput and delay for Ka-band Markov satellite channels.","PeriodicalId":136537,"journal":{"name":"2001 MILCOM Proceedings Communications for Network-Centric Operations: Creating the Information Force (Cat. No.01CH37277)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126881977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-28DOI: 10.1109/MILCOM.2001.985836
M. Chamberlain
The US government has developed and adopted a new military standard vocoder (MIL-STD-3005) algorithm called mixed excitation linear prediction (MELP) which operates at 2.4 kbps. The vocoder has good voice quality under benign error channels. However, when the vocoder is subjected to a HF channel with typical power output of a manpack radio (MPR), the vocoder speech quality is severely degraded. Harris has found that a 600 bps vocoder provides significant increase in secure voice availability relative to the 2.4 kbps vocoder. This paper describes a 600 bps MELP vocoder algorithm that takes advantage of the inherent inter-frame redundancy of the MELP parameters. Data is presented showing the advantage in both diagnostic acceptability measure (DAM) and diagnostic rhyme test (DRT) with respect to SNR on a typical HF channel when using the vocoder with a MIL-STD-188-110B waveform.
{"title":"A 600 bps MELP vocoder for use on HF channels","authors":"M. Chamberlain","doi":"10.1109/MILCOM.2001.985836","DOIUrl":"https://doi.org/10.1109/MILCOM.2001.985836","url":null,"abstract":"The US government has developed and adopted a new military standard vocoder (MIL-STD-3005) algorithm called mixed excitation linear prediction (MELP) which operates at 2.4 kbps. The vocoder has good voice quality under benign error channels. However, when the vocoder is subjected to a HF channel with typical power output of a manpack radio (MPR), the vocoder speech quality is severely degraded. Harris has found that a 600 bps vocoder provides significant increase in secure voice availability relative to the 2.4 kbps vocoder. This paper describes a 600 bps MELP vocoder algorithm that takes advantage of the inherent inter-frame redundancy of the MELP parameters. Data is presented showing the advantage in both diagnostic acceptability measure (DAM) and diagnostic rhyme test (DRT) with respect to SNR on a typical HF channel when using the vocoder with a MIL-STD-188-110B waveform.","PeriodicalId":136537,"journal":{"name":"2001 MILCOM Proceedings Communications for Network-Centric Operations: Creating the Information Force (Cat. No.01CH37277)","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127111194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-28DOI: 10.1109/MILCOM.2001.985984
J. Anderson, J. Stevens, F. Mabe
The Joint Tactical Radio System (JTRS) will result in a family of tactical radios all built upon a common, open software communication architecture (SCA). The JTRS SCA version 2.0 release includes waveform application programming interface (API) building blocks (BBs) that can be used to support a portable and interoperable wideband networking waveform (WNW) within a JTRS SCA-compliant operating environment (OE). This paper describes how the waveform API BBs could be used to support the porting of a WNW by describing Rockwell Collins' experience in porting its wireless-wideband networking engine (WNE) into the JTRS OE The WNE is an ad-hoc wireless networking product that has been instantiated in multiple non-JTRS radios.
{"title":"Implementation of a WNW within the JTRS operating environment using networking APIs","authors":"J. Anderson, J. Stevens, F. Mabe","doi":"10.1109/MILCOM.2001.985984","DOIUrl":"https://doi.org/10.1109/MILCOM.2001.985984","url":null,"abstract":"The Joint Tactical Radio System (JTRS) will result in a family of tactical radios all built upon a common, open software communication architecture (SCA). The JTRS SCA version 2.0 release includes waveform application programming interface (API) building blocks (BBs) that can be used to support a portable and interoperable wideband networking waveform (WNW) within a JTRS SCA-compliant operating environment (OE). This paper describes how the waveform API BBs could be used to support the porting of a WNW by describing Rockwell Collins' experience in porting its wireless-wideband networking engine (WNE) into the JTRS OE The WNE is an ad-hoc wireless networking product that has been instantiated in multiple non-JTRS radios.","PeriodicalId":136537,"journal":{"name":"2001 MILCOM Proceedings Communications for Network-Centric Operations: Creating the Information Force (Cat. No.01CH37277)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127165921","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-28DOI: 10.1109/MILCOM.2001.985983
M. Pursley, H. Russell, J. Wysocarski
The purpose of adaptive forwarding is to provide short-term responses to changes in propagation conditions and network topology in mobile store-and-forward wireless communication networks. The primary need for such short-term responses occurs during the time period between consecutive updates to the routing tables. In this paper a new adaptive-forwarding protocol is described and evaluated for frequency-hop (FH) mobile wireless networks. The forwarding protocol operates in conjunction with adaptive routing and adaptive transmission to provide energy-efficient delivery of packets. Channel state information, which is developed in the receivers of the terminals in the network, is used to estimate the energy requirements of alternative routes for use in the routing protocol. For FH networks the channel state information consists primarily of counts of errors and erasures that are generated in the demodulators and decoders. Since channel state information may become outdated, especially for infrequently used links, it is desirable to provide a mechanism for occasionally testing links that have not handled packets recently. A feature of the new adaptive-transmission protocol is that it employs information packets, rather than control packets, to update the channel state information and thereby benefit the routing protocol without adding overhead traffic to the network load.
{"title":"An improved forwarding protocol for updating channel state information in mobile FH wireless networks","authors":"M. Pursley, H. Russell, J. Wysocarski","doi":"10.1109/MILCOM.2001.985983","DOIUrl":"https://doi.org/10.1109/MILCOM.2001.985983","url":null,"abstract":"The purpose of adaptive forwarding is to provide short-term responses to changes in propagation conditions and network topology in mobile store-and-forward wireless communication networks. The primary need for such short-term responses occurs during the time period between consecutive updates to the routing tables. In this paper a new adaptive-forwarding protocol is described and evaluated for frequency-hop (FH) mobile wireless networks. The forwarding protocol operates in conjunction with adaptive routing and adaptive transmission to provide energy-efficient delivery of packets. Channel state information, which is developed in the receivers of the terminals in the network, is used to estimate the energy requirements of alternative routes for use in the routing protocol. For FH networks the channel state information consists primarily of counts of errors and erasures that are generated in the demodulators and decoders. Since channel state information may become outdated, especially for infrequently used links, it is desirable to provide a mechanism for occasionally testing links that have not handled packets recently. A feature of the new adaptive-transmission protocol is that it employs information packets, rather than control packets, to update the channel state information and thereby benefit the routing protocol without adding overhead traffic to the network load.","PeriodicalId":136537,"journal":{"name":"2001 MILCOM Proceedings Communications for Network-Centric Operations: Creating the Information Force (Cat. No.01CH37277)","volume":"135 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113972724","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-28DOI: 10.1109/MILCOM.2001.985841
A.F.R. Gillespie, S. Trinder, D. Brown
The transmission of commercial SMTP e-mail over the HF communications bearer is explicitly supported by proxy agents in the STANAG 5066 profile. This paper provides a quantitative analysis of the performance of the Compressed File Transfer Protocol (CFTP) and HF Mail Transfer Protocol (HMTP) proxy agents defined in STANAG 5066. The performance of proxy agents is then compared with the performance achieved using SMTP and other standard TCP/IP network applications with the PPP and IP clients defined in STANAG 5066. A critical comparison of the merits of the various approaches for the practical implementation of networked HF applications over STANAG 5066 in support of network centric warfare in a maritime environment is provided.
{"title":"Client application considerations for low bandwidth communications using STANAG 5066","authors":"A.F.R. Gillespie, S. Trinder, D. Brown","doi":"10.1109/MILCOM.2001.985841","DOIUrl":"https://doi.org/10.1109/MILCOM.2001.985841","url":null,"abstract":"The transmission of commercial SMTP e-mail over the HF communications bearer is explicitly supported by proxy agents in the STANAG 5066 profile. This paper provides a quantitative analysis of the performance of the Compressed File Transfer Protocol (CFTP) and HF Mail Transfer Protocol (HMTP) proxy agents defined in STANAG 5066. The performance of proxy agents is then compared with the performance achieved using SMTP and other standard TCP/IP network applications with the PPP and IP clients defined in STANAG 5066. A critical comparison of the merits of the various approaches for the practical implementation of networked HF applications over STANAG 5066 in support of network centric warfare in a maritime environment is provided.","PeriodicalId":136537,"journal":{"name":"2001 MILCOM Proceedings Communications for Network-Centric Operations: Creating the Information Force (Cat. No.01CH37277)","volume":"373 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113998257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-28DOI: 10.1109/MILCOM.2001.985845
D. Kallgren, J. Smaal
NC3A (NATO Consultation, Command and Control Agency) has implemented an IP client for STANAG 5066 high frequency (HF) subnetwork servers, supporting unicast and multicast IP operations in an HF wireless WAN using NATO's "Profile for HF Radio Data Communications", STANAG 5066. The IP client uses the character-based Ethernet device 'TUN/TAP' to interface to the IP protocol stack in the Linux operating system. A socket-based interface between client and subnetwork is used with an IANA-registered port number. Existing code was reused from previous work at NC3A that implemented a PPP (point-to-point protocol) client for unicast IP operation. Unicast IP packets are mapped onto the ARQ service mode in STANAG 5066 Multicast IP packets are mapped onto the non-ARQ service modes with group addressing. Both IP addressing modes are multiplexed within the STANAG 5066 subnetwork and are dynamically supportable. Performance issues for TCP over low-speed/high-latency links and the usability of LAN/WAN oriented routing and QoS protocols on HF radio are also discussed. This work is being pursued to integrate modern HF protocols and waveforms into the future NATO wireless WAN for deployed forces.
{"title":"IP unicast/multicast operation over STANAG 5066","authors":"D. Kallgren, J. Smaal","doi":"10.1109/MILCOM.2001.985845","DOIUrl":"https://doi.org/10.1109/MILCOM.2001.985845","url":null,"abstract":"NC3A (NATO Consultation, Command and Control Agency) has implemented an IP client for STANAG 5066 high frequency (HF) subnetwork servers, supporting unicast and multicast IP operations in an HF wireless WAN using NATO's \"Profile for HF Radio Data Communications\", STANAG 5066. The IP client uses the character-based Ethernet device 'TUN/TAP' to interface to the IP protocol stack in the Linux operating system. A socket-based interface between client and subnetwork is used with an IANA-registered port number. Existing code was reused from previous work at NC3A that implemented a PPP (point-to-point protocol) client for unicast IP operation. Unicast IP packets are mapped onto the ARQ service mode in STANAG 5066 Multicast IP packets are mapped onto the non-ARQ service modes with group addressing. Both IP addressing modes are multiplexed within the STANAG 5066 subnetwork and are dynamically supportable. Performance issues for TCP over low-speed/high-latency links and the usability of LAN/WAN oriented routing and QoS protocols on HF radio are also discussed. This work is being pursued to integrate modern HF protocols and waveforms into the future NATO wireless WAN for deployed forces.","PeriodicalId":136537,"journal":{"name":"2001 MILCOM Proceedings Communications for Network-Centric Operations: Creating the Information Force (Cat. No.01CH37277)","volume":"258 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121028663","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-28DOI: 10.1109/MILCOM.2001.986027
K. Tepe, J.B. Anderson
Turbo coding is investigated for uninterleaved and partially interleaved Rayleigh fading channels. It is compared to ordinary convolutional coding with the same rate and memory 2, 4 and 8 best d/sub free/ encoders. When turbo frames are very long, turbo coding with a channel interleaver gets better bit error rates (BER) than ordinary convolutional coding with a channel interleaver. When the frames are shorter, lower complexity convolutional coding is as good as turbo coding. It is shown by experiment that only after a certain critical frame size does turbo coding get better BER than convolutional coding and the length of this threshold is linearly dependent on the inverse of the fading bandwidth, 1/BT. The effect of the constituent encoders on the error performance is also tested. Memory 2, 4 and 6 constituent encoders are compared. For short to moderate turbo frame size, the memory 2 constituent encoder is as good as the memory 4 and better than the memory 6 encoder. For very long block-lengths, the memory 4 encoder is the best. The memory 6 encoder is always the worst.
{"title":"Turbo coding behavior in Rayleigh fading channels without perfect interleaving","authors":"K. Tepe, J.B. Anderson","doi":"10.1109/MILCOM.2001.986027","DOIUrl":"https://doi.org/10.1109/MILCOM.2001.986027","url":null,"abstract":"Turbo coding is investigated for uninterleaved and partially interleaved Rayleigh fading channels. It is compared to ordinary convolutional coding with the same rate and memory 2, 4 and 8 best d/sub free/ encoders. When turbo frames are very long, turbo coding with a channel interleaver gets better bit error rates (BER) than ordinary convolutional coding with a channel interleaver. When the frames are shorter, lower complexity convolutional coding is as good as turbo coding. It is shown by experiment that only after a certain critical frame size does turbo coding get better BER than convolutional coding and the length of this threshold is linearly dependent on the inverse of the fading bandwidth, 1/BT. The effect of the constituent encoders on the error performance is also tested. Memory 2, 4 and 6 constituent encoders are compared. For short to moderate turbo frame size, the memory 2 constituent encoder is as good as the memory 4 and better than the memory 6 encoder. For very long block-lengths, the memory 4 encoder is the best. The memory 6 encoder is always the worst.","PeriodicalId":136537,"journal":{"name":"2001 MILCOM Proceedings Communications for Network-Centric Operations: Creating the Information Force (Cat. No.01CH37277)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127677921","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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