{"title":"Antijamming performance of slow FH-CPM signals with concatenated coding and jamming estimation","authors":"H. Kim, Q. Zhao, G. Stuber, K. Narayanan","doi":"10.1109/MILCOM.2003.1290338","DOIUrl":"https://doi.org/10.1109/MILCOM.2003.1290338","url":null,"abstract":"A slow frequency-hopping (FH) spread-spectrum (SS) system with trellis-coded interleaved continuous phase modulation (CPM) is proposed, where the phase is continuous during each hop interval. The proposed system provides power- and bandwidth-efficient antijam capability in the presence of partial-band noise jamming. The proposed receivers use coherent or noncoherent iterative demodulation and decoding along with jammer state information. Furthermore, an iterative jamming state estimation technique is proposed to provide robust antijam performance.","PeriodicalId":435910,"journal":{"name":"IEEE Military Communications Conference, 2003. MILCOM 2003.","volume":"473 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127549142","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}
{"title":"Performance of chip-level differential detection for DS-CDMA in multipath fading channels","authors":"M. Howlader, H. Chang","doi":"10.1109/MILCOM.2003.1290321","DOIUrl":"https://doi.org/10.1109/MILCOM.2003.1290321","url":null,"abstract":"Chip-level differential detection has been proposed and studied in frequency-nonselective fast fading channels in (Cavallini, et al., (1997)). However, the performance in multipath Rayleigh fading channels has not been studied so far. In this paper, we evaluate the impact of multipath channels on the performances of two types of chip-level differential detections. The bit error rate (BER) results are investigated via simulations. The performance of a conventional symbol-level differential detection is also studied as a comparison.","PeriodicalId":435910,"journal":{"name":"IEEE Military Communications Conference, 2003. MILCOM 2003.","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122235532","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}
{"title":"Multiuser CDMA with a chip-level interference cancellation technique","authors":"J. Dunyak, Charles Suprin","doi":"10.1109/MILCOM.2003.1290129","DOIUrl":"https://doi.org/10.1109/MILCOM.2003.1290129","url":null,"abstract":"Multiple-access interference (MAI) limits the performance of CDMA systems using the conventional receiver, but the optimal receiver is too complex for practical implementation. This paper demonstrates a numerically efficient technique for reducing MAI in CDMA systems. The technique, a nonlinear approach inspired by the Kalman filter, uses decoupled filters to estimate symbols for each user while accomplishing interference cancellation in the innovation term. The filter technique developed here provides a computationally practical approach to multiuser detection for asynchronous long code systems, which significantly outperforms the conventional receiver. Kalman filter approaches to multiuser detection have been applied before (Lim and Ma 2000, Lim et. al. 1998) to binary phase shift keying through implementation of a standard Kalman filter approach. Unfortunately, this leads to high computational complexity. Here, we instead consider a formulation in which the spreading codes are viewed as random and their properties are used to decouple the Kalman filter for each user. Interference cancellation is then implemented through the innovations. A binary minimum mean squared error estimate is made, which results in a nonlinear estimator. The new nonlinear technique is shown to significantly outperform an optimized partial parallel interference cancellation approach, which is the current state of the art technique for asynchronous long code systems. System capacity is then significantly increased.","PeriodicalId":435910,"journal":{"name":"IEEE Military Communications Conference, 2003. MILCOM 2003.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130399638","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}
K. Young, S. Samtani, S. Khurana, P. Gurung, L. Wong, J. Lee, W. Stephens, C. Graff, M. Bereschinsky
{"title":"Ad hoc mobility protocol suite for the MOSAIC ATD","authors":"K. Young, S. Samtani, S. Khurana, P. Gurung, L. Wong, J. Lee, W. Stephens, C. Graff, M. Bereschinsky","doi":"10.1109/MILCOM.2003.1290422","DOIUrl":"https://doi.org/10.1109/MILCOM.2003.1290422","url":null,"abstract":"An ad hoc mobility protocol suite (AMPS) aimed at providing rapidly deployable, secure, robust IP-based communications among tactical mobile ad hoc nodes is presented in this paper. AMPS is an integrated networking solution for the MOSAIC ATD in that it provides the following capabilities: autoconfiguration, mobility management, unicast and multicast routing, reliable transport, quality of service, security and network visualization tools. This paper describes the architecture and implementation of AMPS for the MOSAIC ATD. Both laboratory and field experiments to measure AMPS functionality and performance were conducted in 2002 and 2003. This paper reports on the results of those experiments and their impact on future AMPS design and operation.","PeriodicalId":435910,"journal":{"name":"IEEE Military Communications Conference, 2003. MILCOM 2003.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131245871","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}
L. Kant, A. McAuley, R. Morera, A. Sethi, M. Steinder
{"title":"Fault localization and self-healing with dynamic domain configuration","authors":"L. Kant, A. McAuley, R. Morera, A. Sethi, M. Steinder","doi":"10.1109/MILCOM.2003.1290294","DOIUrl":"https://doi.org/10.1109/MILCOM.2003.1290294","url":null,"abstract":"Compared to their commercial counterparts, future battlefield networks require much more extensive fault management and automation mechanisms. Much work has been done to improve these functions, since survivability and automation are seen as critical to the Army's next generation tactical and strategic battlefield networks such as FCS; however, they are generally treated separately. This paper highlights the synergy between these functions. In particular we show that by reconfiguring domains, as fault localization and multilayer self-healing algorithms mandate, we can help speed the process in isolating the cause of many of these alarms and help solve some of the network problems.","PeriodicalId":435910,"journal":{"name":"IEEE Military Communications Conference, 2003. MILCOM 2003.","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131391565","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}
{"title":"Enabling the objective force: concepts, technologies, and challenges","authors":"J. Burbank","doi":"10.1109/MILCOM.2003.1290103","DOIUrl":"https://doi.org/10.1109/MILCOM.2003.1290103","url":null,"abstract":"This paper addresses some of the key technological needs that will enable the transformation of the army to the objective force. The objective force operates as a cohesive, mobile, lethal, survivable, and sustainable land combat force capable of rapid deployment and immediate employment upon arrival, as a unit. This is achieved through network-centric operations wherein the force is realized through the network. The communications architecture of the objective force employs a variety of communications techniques and protocols to enable the mission. Key enabling technologies include adaptive communications techniques, mobile ad-hoc networking, quality of service based networking, seamless internetworking, and seamless network management across disparate networks.","PeriodicalId":435910,"journal":{"name":"IEEE Military Communications Conference, 2003. MILCOM 2003.","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132733894","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}
{"title":"Multitier mobile ad hoc networks: architecture, protocols, and perfomance","authors":"B. Ryu, T. Andersen, T. Elbatt, Yongguang Zhang","doi":"10.1109/MILCOM.2003.1290411","DOIUrl":"https://doi.org/10.1109/MILCOM.2003.1290411","url":null,"abstract":"While mobile ad-hoc networking (MANET) research has received a considerable attention in recent years, the majority of them have focused on single-tier (e.g., ground) and homogeneous (e.g., same radio for every node) MANET. Few have investigated the potential implications of multitier and heterogeneous natures of MANET on the design and performance of MANET protocols in a systematic manner. For example, one of the stark differences between single-tier and multitier MANET environments is that the multitier MANET naturally creates \"coverage asymmetry\" due to the much larger coverage area by airborne nodes compared to ground nodes. Consequently, the number of \"neighbors\" an airborne node sees can be potentially several orders of magnitude larger than that of a ground node. Treating this airborne node same as any ground node will adversely affect the performance of medium access control (MAC) and/or routing MANET protocols. In this paper, we present a detailed multitier MANET architecture, associated issues, and protocols developed. Our novel protocols and simulation tools designed for multitier MANET are described with preliminary performance results.","PeriodicalId":435910,"journal":{"name":"IEEE Military Communications Conference, 2003. MILCOM 2003.","volume":"182 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132741661","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}
{"title":"A study of TCP performance for mobile SATCOM system over blocking conditions","authors":"G.A. Briceno, D.J. Shyy, J. Wu","doi":"10.1109/MILCOM.2003.1290437","DOIUrl":"https://doi.org/10.1109/MILCOM.2003.1290437","url":null,"abstract":"High throughput while minimizing packet latency are the essential requirements for deploying IP data over a SATCOM channel. To gauge the performance of IP data applications over a SATCOM channel, the performance of TCP/IP is often observed. This paper analyzes the TCP/IP throughput and delay performance characteristics as well as investigates the benefits gained by tuning TCP/IP parameters to mitigate its performance degradation due to delays and blockages inherent to a SATCOM channel. A hardware test bed is used to analyze the TCP/IP behavior under realistic satellite channel conditions. Experimental results are validated using OPNET simulation software. The comparisons show a perfect match between experimental and simulated results. Analysis shows that with the tuning of TCP/IP stack, it is capable of overcoming the effect of satellite channel delay while providing reliable delivery even through frequent blockage events. It is also shown that with a simple link layer retransmission process in place, the performance of TCP/IP can be further improved.","PeriodicalId":435910,"journal":{"name":"IEEE Military Communications Conference, 2003. MILCOM 2003.","volume":"175 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128353305","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}
J. Kleider, S. Gifford, G. Maalouli, S. Chuprun, Brian M. Sadler
{"title":"Synchronization for RF carrier frequency hopped OFDM: analysis and simulation","authors":"J. Kleider, S. Gifford, G. Maalouli, S. Chuprun, Brian M. Sadler","doi":"10.1109/MILCOM.2003.1290382","DOIUrl":"https://doi.org/10.1109/MILCOM.2003.1290382","url":null,"abstract":"In this work, we apply RF carrier frequency hopping to orthogonal frequency division multiplexing (FH-OFDM) and study the hop rate capability using realistic performance of signal acquisition/synchronization of the unknown time and frequency offset parameters. OFDM synchronization is a challenging task without RF carrier hopping due to OFDM's sensitivity to time and frequency offsets. Given sufficient synchronization estimation performance is achieved, our objective is to determine the hop rate capabilities for OFDM using two different data-aided synchronization approaches. The first method is based on sending information in a preamble before the OFDM payload symbol. The second method embeds known synchronization information directly into the OFDM symbol stream. Using differential QPSK-OFDM modulation and spectral efficiency greater than 1 bps/Hz, results indicate that sufficient synchronization performance can be achieved for hop rates greater than 6 and 1 khops/sec for the preamble- and embedded-based synchronizers, respectively.","PeriodicalId":435910,"journal":{"name":"IEEE Military Communications Conference, 2003. MILCOM 2003.","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128582100","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}
{"title":"Satellite communications networks with IP quality of services","authors":"K. Y. Jo, Tony Modelfino","doi":"10.1109/MILCOM.2003.1290113","DOIUrl":"https://doi.org/10.1109/MILCOM.2003.1290113","url":null,"abstract":"This paper presents a satellite communications (SATCOM) architecture that uses packet switched technologies and addresses the relationships between SATCOM and IP quality of service (QoS). The onboard satellite processing with fast-packet switching rather than traditional circuit switch or bent pipe SATCOM connections, is described first. The performance of such an architecture may improve or degrade with IP QoS services depending on how they interact. The network architecture incorporates a bandwidth-on-demand concept through demand-assigned multiple-access (DAMA) protocols, and achieves multiple levels of QoS services through IP class-of-service (CoS). This concept improves application performance, increases network utilization and throughput, and reduces message/file transfer times. The bit error rates that are inherent to SATCOM networks do not apply directly to the architecture. Underlying performance evaluation methodologies as well as related implementation issues for the proposed architecture are addressed. The onboard switching architecture generally brings about performance improvements, but one case that degrades performance is presented. In this example, excessive delays occur when transmitting moderate-to-high bit error rates due to an IP error recovery procedure that induces more lower-layer packet segmentation and reassembly processes. Thus, the higher bit error rate caused by satellite links can be critical for the performance. This observation along with related protocol and performance issues leads to the conclusion that the essential IP features will only be operative for the fast-packet switching SATCOM architecture.","PeriodicalId":435910,"journal":{"name":"IEEE Military Communications Conference, 2003. MILCOM 2003.","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132048965","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}