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Programmable channelized digital radio/modem 可编程信道化数字无线电/调制解调器
MILCOM 92 Conference Record Pub Date : 1992-10-11 DOI: 10.1109/MILCOM.1992.243963
R. Prill, M. Antonesco
{"title":"Programmable channelized digital radio/modem","authors":"R. Prill, M. Antonesco","doi":"10.1109/MILCOM.1992.243963","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.243963","url":null,"abstract":"The authors describe ongoing work by GEC-Marconi Electronic Systems Division in the development of a multifunction, common module, programmable digital radio/modem. The radio system handles both conventional narrowband and spread-spectrum waveforms. The architecture developed is a programmable channelized approach. In the channelized approach the modules of one channel are identical to those of the next, and as such are ideally suited to channel reusability during different parts of a mission or during failure modes of higher-priority functional systems. The hardware implementation exploits the latest RF, digital-RF, and digital signal processing component technologies. A PC-based brassboard was developed and used to demonstrate real-time programmable AM, FM, and IFF reception.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130728439","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}
引用次数: 3
On the practical aspects of the reference channel detector in frequency-hopping receivers 跳频接收机中参考信道检测器的实用问题
MILCOM 92 Conference Record Pub Date : 1992-10-11 DOI: 10.1109/MILCOM.1992.244092
N. Stojanović, V. Jovanovic
{"title":"On the practical aspects of the reference channel detector in frequency-hopping receivers","authors":"N. Stojanović, V. Jovanovic","doi":"10.1109/MILCOM.1992.244092","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.244092","url":null,"abstract":"Threshold setting methods for serial search acquisition of frequency hopping waveforms are considered. The reference channel detector (Stojanovic and Jovanovic, 1991), which shows considerable immunity to charges in signal dynamics and pulse jamming, is analyzed with respect to hardware complexity. Various configurations are discussed, and their performance is evaluated. A modified search strategy which reduces the mean acquisition time is proposed. For slow frequency hopping, it is shown that a widely used procedure in tactical radios, where a binary demodulator is followed by a correlator, is the direct approximation of the reference channel detector.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128999622","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}
引用次数: 1
A dynamic high speed multi-media local area network (MLAN) protocol architecture 一种动态高速多媒体局域网(MLAN)协议体系结构
MILCOM 92 Conference Record Pub Date : 1992-10-11 DOI: 10.1109/MILCOM.1992.243956
J. Agrawal, U. Varshney
{"title":"A dynamic high speed multi-media local area network (MLAN) protocol architecture","authors":"J. Agrawal, U. Varshney","doi":"10.1109/MILCOM.1992.243956","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.243956","url":null,"abstract":"The design of a multimedia LAN (MLAN) protocol using a broadcast bus system topology suitable for a campus environment is considered. It minimizes the bus access time by using an advanced reservation technique, and accommodates requests for several packet sizes expressed in multiples of asynchronous transfer mode (ATM) cell size. The architecture presented assumes a MLAN speed of 50 Mb/s, and can be easily extended to the STS-3 signal bit rate of 150 Mb/s. The bus access techniques, bandwidth allocation for various types of traffic, clock synchronization, etc. are monitored and changed/adjusted dynamically according to traffic conditions on the bus.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121162041","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}
引用次数: 5
Network waiting time for meteor-burst communications 突发流星通信的网络等待时间
MILCOM 92 Conference Record Pub Date : 1992-10-11 DOI: 10.1109/MILCOM.1992.244102
W. Ralston, J. Weitzen
{"title":"Network waiting time for meteor-burst communications","authors":"W. Ralston, J. Weitzen","doi":"10.1109/MILCOM.1992.244102","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.244102","url":null,"abstract":"By using the diversity factor as a measure of the link correlation in a meteor-burst communications system, performance bounds for the network waiting time of meteor burst networks are found. It is shown that the performance of a meteor burst network can degrade significantly when the diversity factor is low unless a means of processing multiple responses per trail is provided. A code-division multiple-access system is shown to be one means of providing and allocating additional capacity for processing multiple responses. Significant reductions in the waiting time of the system are obtained.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121697528","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}
引用次数: 3
Narrowband interference rejection using small FFT block sizes 窄带干扰抑制使用小FFT块大小
MILCOM 92 Conference Record Pub Date : 1992-10-11 DOI: 10.1109/MILCOM.1992.244006
S. Howard
{"title":"Narrowband interference rejection using small FFT block sizes","authors":"S. Howard","doi":"10.1109/MILCOM.1992.244006","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.244006","url":null,"abstract":"The performance of fast Fourier transform (FFT)-based excision processing (suppression of narrowband interference collocated in frequency with direct-sequence spread-spectrum signals) using block sizes which have time durations less than a bit time is examined. The FFT block size is chosen to provide frequency resolution consistent with the interference environment, and it is smaller than the number of samples taken during the data bit period. This technique is favorable in situations where the interference is sparse and the processing gains are large. Rectangular windowing with nonoverlapped processing and Hann and Hamming windowing with 50% overlapped processing are compared. Results for single continuous wave interference signals at jammer-to-signal ratios of 0 to 100 dB are presented. The performance for this method of processing is comparable to that for systems where the block size is coincident with the data bit duration, but the processing load has been reduced.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128038307","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}
引用次数: 6
LPI waveform shaping by modified chirp filter 改进的啁啾滤波器的LPI波形整形
MILCOM 92 Conference Record Pub Date : 1992-10-11 DOI: 10.1109/MILCOM.1992.243940
J. Yoo
{"title":"LPI waveform shaping by modified chirp filter","authors":"J. Yoo","doi":"10.1109/MILCOM.1992.243940","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.243940","url":null,"abstract":"A computer simulation has shown that a modified chirp filter with odd phase symmetry can suppress the line spectrum produced by a binary phase shift keying (BPSK) signal at the output of a squaring circuit (SC) by destroying the cyclostationarity of the signal. Unlike LPI waveform shaping by heavy filtering, the modified chirp filter converts the line spectrum to the self-noise spectrum. This line spectrum can be restored using a matched filter. However, the advantage of using the modified chirp filter over an ordinary chirp filter is the difficulty of figuring out its matched filter even if the chirp duration and frequency slope are known to the interceptor.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122771980","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}
引用次数: 1
Fractal image compression using iterative transforms: applications to DTED 使用迭代变换的分形图像压缩:DTED的应用
MILCOM 92 Conference Record Pub Date : 1992-10-11 DOI: 10.1109/MILCOM.1992.244111
E. W. Jacobs, R. D. Boss
{"title":"Fractal image compression using iterative transforms: applications to DTED","authors":"E. W. Jacobs, R. D. Boss","doi":"10.1109/MILCOM.1992.244111","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.244111","url":null,"abstract":"A review of iterated transformation image compression is presented. Generalization of simple iterated function system fractal generating algorithms to an automated iterated transformation algorithm used to compress gray-scale images is reviewed. Compressed images from the Digital Terrain Elevation Database (DTED) are presented and are compared with encodings using adaptive discrete cosine transformations and mean residual vector quantization image compression techniques.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122833013","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}
引用次数: 4
MSK performance under various fading conditions in the presence of worst-case CW interference 在最坏连续波干扰下，MSK在各种衰落条件下的性能
MILCOM 92 Conference Record Pub Date : 1992-10-11 DOI: 10.1109/MILCOM.1992.244050
J. T. Gamble
{"title":"MSK performance under various fading conditions in the presence of worst-case CW interference","authors":"J. T. Gamble","doi":"10.1109/MILCOM.1992.244050","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.244050","url":null,"abstract":"The author analyzes the flat-fading-channel performance of coherent MSK (minimum shift keying) matched filter demodulation in the presence of cochannel interference. It is shown that the most deleterious interference is CW (continuous wave) at center frequency. Bit error rate (BER) performance is first characterized for nonfading signal and interference typical of a terrestrial line-of-sight scenario. Subsequent analyses address fading signal vs. nonfading interference (typical of a long skywave or scintillation communication path and local interference), fading signal vs. fading interference (typical of satellite communication performance in ionospheric fading and remote interference), and nonfading signal vs. fading interference. The performance under fading-signal conditions, regardless of whether the interference is constant (short range) or fading (long range), is extremely poor; to be usable, such channels will require the use of diversity techniques.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121765667","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}
引用次数: 6
Tactical data management in a multilink translator and display system 多链接翻译显示系统中的战术数据管理
MILCOM 92 Conference Record Pub Date : 1992-10-11 DOI: 10.1109/MILCOM.1992.244024
J.M. McNulty
{"title":"Tactical data management in a multilink translator and display system","authors":"J.M. McNulty","doi":"10.1109/MILCOM.1992.244024","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.244024","url":null,"abstract":"The author describes the modular translator display system (MTDS), a prototype system that is being developed to translate and display data from multiple tactical links. It is designed to be portable, modular, adaptable to existing systems, and extensible to future systems. The MTDS is a multiphase development whose design is object-oriented and utilizes multiple database objects to manage generalized track objects for link-to-link translations. Its database objects are implemented through the use of tailorable hashing functions that are capable of access times of the order of 1 mu s for MTDS Phase I DOS platforms.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133952340","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}
引用次数: 0
Convergence and performance comparison of three different structures of bootstrap blind adaptive algorithm for multisignal co-channel separation 三种不同结构的自举盲自适应多信号同信道分离算法的收敛性和性能比较
MILCOM 92 Conference Record Pub Date : 1992-10-11 DOI: 10.1109/MILCOM.1992.243974
A. Dinc, Y. Bar-Ness
{"title":"Convergence and performance comparison of three different structures of bootstrap blind adaptive algorithm for multisignal co-channel separation","authors":"A. Dinc, Y. Bar-Ness","doi":"10.1109/MILCOM.1992.243974","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.243974","url":null,"abstract":"The authors extend the previously reported three structures of bootstrap blind adaptive separators to the multisignal channel case. They suggest a recursive weight updating algorithm for the three structures: power-power, correlator-correlator, and power-correlator. The optimum weights for these separators were found analytically in the absence of noise. The signal separation process was shown via simulation by the output learning curve. It was shown that the different bootstrap separators converge to their steady states almost with the same speed for a two or three signal channel. The steady-state interference residues of the three separators are different, lowest for power-power and highest for correlator-correlator. The use of equalization (automatic gain control) at the output of these structures improves the depth of interference cancellation dramatically.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134064110","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}
引用次数: 14
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