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A Study of Viterbi's Ratio-Threshold AJ Technique Viterbi比值阈值AJ技术的研究
MILCOM 1984 - IEEE Military Communications Conference Pub Date : 1984-10-01 DOI: 10.1109/MILCOM.1984.4794860
L. Chang, R. McEliece
{"title":"A Study of Viterbi's Ratio-Threshold AJ Technique","authors":"L. Chang, R. McEliece","doi":"10.1109/MILCOM.1984.4794860","DOIUrl":"https://doi.org/10.1109/MILCOM.1984.4794860","url":null,"abstract":"In this paper we study the performance of several AJ systems based on Viterbi's ratio-threshold technique for FH/SS communications. Innovative features of our work include the use of channel capacity as the figure of merit, and the use of randomly varying thresholds.","PeriodicalId":375763,"journal":{"name":"MILCOM 1984 - IEEE Military Communications Conference","volume":"14 5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1984-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126103599","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: 31
Signal Design for FH-SSMA Communication System using Pseudo Random Sequences 基于伪随机序列的FH-SSMA通信系统信号设计
MILCOM 1984 - IEEE Military Communications Conference Pub Date : 1984-10-01 DOI: 10.1109/MILCOM.1984.4794901
G. M. Rao, S. Maskara
{"title":"Signal Design for FH-SSMA Communication System using Pseudo Random Sequences","authors":"G. M. Rao, S. Maskara","doi":"10.1109/MILCOM.1984.4794901","DOIUrl":"https://doi.org/10.1109/MILCOM.1984.4794901","url":null,"abstract":"The paper describes a method of design of addresses using PN sequences for a frequency hopping spread spectrum multiple access (FH-SSMA) system meant for speech communication. The frequency of the transmitted signal is hopped in L equal time intervals in a sequence determined by the PNS derived address. A system is suggested for digital speech at 31.25 kbps to be transmitted in a channel band width of 36 MHz. Correlation functions of PN sequences of lengths 31, 63 and 127 and coincidence functions for the addresses have been computed. It is found that the derived addresses are less correlated as compared to the PN sequences. System performance in a random access environment has been computed. For a false detection probability PF≪ 10¿4, the system would support six simultaneously active subscribers.","PeriodicalId":375763,"journal":{"name":"MILCOM 1984 - IEEE Military Communications Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1984-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128386629","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
Subjective Performance of Selected Speech Coders in the Presence of Channel Errors 存在信道错误时所选语音编码器的主观性能
MILCOM 1984 - IEEE Military Communications Conference Pub Date : 1984-10-01 DOI: 10.1109/MILCOM.1984.4794905
R. McKinley, R. V. Kurtz
{"title":"Subjective Performance of Selected Speech Coders in the Presence of Channel Errors","authors":"R. McKinley, R. V. Kurtz","doi":"10.1109/MILCOM.1984.4794905","DOIUrl":"https://doi.org/10.1109/MILCOM.1984.4794905","url":null,"abstract":"Speech intelligibility data of several voice coding techniques suitable for use in an air-to-air RF digital communication link is presented. The voice encoding techniques analyzed and their respective bit rates were as follows: adaptive differential pulse code modulation (ADPCM) at 24 kbps, continuously variable slope delta modulation (CVSD) at 16 kbps, sub-band coding (SBC) at 16 kbps, time domain harmonic scaling with sub-band coding (TDHS/SBC) at 9.6 kbps, and linear predictive coding (LPC-10) at 2.4 kbps. The RF digital communication link was simulated by random bit error insertion between the voice encoder and voice decoder. The resulting speech intelligibility performance was measured subjectively using the Modified Rhyme Test (MRT). Data graphs depicting speech intelligibility versus bit error rate (BER) are presented. This data shows that ADPCM and CVSD are most tolerant of bit errors, followed by SBC, TDHS/SBC, and LPC-10 in that order.","PeriodicalId":375763,"journal":{"name":"MILCOM 1984 - IEEE Military Communications Conference","volume":"197 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1984-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124358667","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
Spatial Tracking System for Heterodyne Optical Communication 用于异频光通信的空间跟踪系统
MILCOM 1984 - IEEE Military Communications Conference Pub Date : 1984-10-01 DOI: 10.1109/MILCOM.1984.4795006
E. Swanson, V. Chan
{"title":"Spatial Tracking System for Heterodyne Optical Communication","authors":"E. Swanson, V. Chan","doi":"10.1109/MILCOM.1984.4795006","DOIUrl":"https://doi.org/10.1109/MILCOM.1984.4795006","url":null,"abstract":"Optical heterodyne techniques are used to meet the stringent angular tracking requirements necessary for an optical communication system to operate properly. The spatial tracking system is assumed to operate in its linear region, use semiconductor lasers, and use a squaring loop to combat the frequency noise due to the lasers. The results reveal a near optimum detector array and a near optimum LO field distribution. Also included are some preliminary experimental results.","PeriodicalId":375763,"journal":{"name":"MILCOM 1984 - IEEE Military Communications Conference","volume":"62 11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1984-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131028042","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: 7
On the Power Spectrum of a Biphase Modulated Signal in a Costas Demodulator Costas解调器中双相调制信号的功率谱
MILCOM 1984 - IEEE Military Communications Conference Pub Date : 1984-10-01 DOI: 10.1109/MILCOM.1984.4794890
T. Oh, D. Ucci
{"title":"On the Power Spectrum of a Biphase Modulated Signal in a Costas Demodulator","authors":"T. Oh, D. Ucci","doi":"10.1109/MILCOM.1984.4794890","DOIUrl":"https://doi.org/10.1109/MILCOM.1984.4794890","url":null,"abstract":"A study of the power spectrum of the phase/frequency error signal when a biphase modulated carrier signal imbedded in Additive White Gaussian Noise (AWGN) and shifted by an unknown frequency offset is received by a Costas' demodulator is presented. The Costast Loop is operated in one of two modes - the tracking mode or the acquisition mode. In the tracking mode we show that the spectrum of the error signal is quite similar to that of the unmodulated carrier case. In the acquisition mode it is shown that the error signal has significant power at twice the unknown frequency offset when Wideband Low Pass Filters (WBLPF) are used at the output of the phase detectors in the in-phase and quadrature phase arms.","PeriodicalId":375763,"journal":{"name":"MILCOM 1984 - IEEE Military Communications Conference","volume":"EMC-26 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1984-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132870383","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
Simulation Study of an Adaptive Reservation Multiple Access Technique for Data Transmissions 数据传输自适应保留多址技术的仿真研究
MILCOM 1984 - IEEE Military Communications Conference Pub Date : 1984-10-01 DOI: 10.1109/MILCOM.1984.4795018
D. Tsai, Jin-Fu Chang
{"title":"Simulation Study of an Adaptive Reservation Multiple Access Technique for Data Transmissions","authors":"D. Tsai, Jin-Fu Chang","doi":"10.1109/MILCOM.1984.4795018","DOIUrl":"https://doi.org/10.1109/MILCOM.1984.4795018","url":null,"abstract":"The performance of a delta-modulation type adaptive reservation multiaccess technique is studied in this paper through simulation. The frame structure of the time-axis remains similar to that in Ref.1. However, channel reservation is handled differently. Through examples we witness the newly proposed protocol shows improved performance.","PeriodicalId":375763,"journal":{"name":"MILCOM 1984 - IEEE Military Communications Conference","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1984-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133609286","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
Frequency - Hopping Spread Spectrum Receiver Synchronization using Real Time Fourier Transform of the Input Signal 利用输入信号的实时傅里叶变换实现跳频扩频接收机同步
MILCOM 1984 - IEEE Military Communications Conference Pub Date : 1984-10-01 DOI: 10.1109/MILCOM.1984.4794848
S. Glisic
{"title":"Frequency - Hopping Spread Spectrum Receiver Synchronization using Real Time Fourier Transform of the Input Signal","authors":"S. Glisic","doi":"10.1109/MILCOM.1984.4794848","DOIUrl":"https://doi.org/10.1109/MILCOM.1984.4794848","url":null,"abstract":"In a spread spectrum communication system the basic problem which has to be solved is the synchronization of the receiver pseudorandom sequence with the same sequence contained in the input signal. In this paper a novel scheme for coarse acquisition of the frequency hopping signal, using its real time Fourier transform at the receiver front end, is presented and analyzed. In the system, an additional logic is used to select the correct frequency estimate so that the average acquisition time is further decreased. The same logic is used to select the search/lock strategy so that the average acquisition time could be minimized. It was shown that considerable improvement of the system performance can be obtained by using this technique compared with the standard serial sinchronization schemes.","PeriodicalId":375763,"journal":{"name":"MILCOM 1984 - IEEE Military Communications Conference","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1984-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123106837","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
A Self-Probing Method for Time Synchronization of Frequency-Hopped Spread Spectrum Systems 跳频扩频系统时间同步的自探测方法
MILCOM 1984 - IEEE Military Communications Conference Pub Date : 1984-10-01 DOI: 10.1109/MILCOM.1984.4794847
M. Blanco
{"title":"A Self-Probing Method for Time Synchronization of Frequency-Hopped Spread Spectrum Systems","authors":"M. Blanco","doi":"10.1109/MILCOM.1984.4794847","DOIUrl":"https://doi.org/10.1109/MILCOM.1984.4794847","url":null,"abstract":"A self-probing method for uplink time synchronization of frequency-hopped satellite communication systems is presented. An approach based on maximum likelihood estimation is followed for coarse acquistion. Fine time synchronization is then achieved by means of a linear interpolation algorithm. The performance of the coarse and fine acquisition algorithms is shown for typical cases of interest.","PeriodicalId":375763,"journal":{"name":"MILCOM 1984 - IEEE Military Communications Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1984-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130753038","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
Spread Spectrum Acquisition under Narrow Band Interference 窄带干扰下的扩频采集
MILCOM 1984 - IEEE Military Communications Conference Pub Date : 1984-10-01 DOI: 10.1109/MILCOM.1984.4794852
Eric W. Siess, C. Weber
{"title":"Spread Spectrum Acquisition under Narrow Band Interference","authors":"Eric W. Siess, C. Weber","doi":"10.1109/MILCOM.1984.4794852","DOIUrl":"https://doi.org/10.1109/MILCOM.1984.4794852","url":null,"abstract":"The acquisition statistics of DS systems when under the influence of narrowband interference are predicted. Tone jamming increases the variance of the detection variable; as a result it significantly influences the probabilities of detection and false alarm of the receiver. The effects of jamming on acquisition time are also assessed for particular acquisition schemes. Finally, the results of these analyses are used to propose a receiver which mitigates the deleterious effects of the jamming. The primary observation is the need for the acquisition receiver to sense and adapt to jamming. A proposed adaptive receiver provides considerable jamming protection and the acquisition performance obtained with such a receiver bounds the performance of all adaptive acquisition receivers.","PeriodicalId":375763,"journal":{"name":"MILCOM 1984 - IEEE Military Communications Conference","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1984-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115420774","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
Tracking of Fast Frequency Hopping Spread Spectrum Signals 快速跳频扩频信号的跟踪
MILCOM 1984 - IEEE Military Communications Conference Pub Date : 1984-10-01 DOI: 10.1109/MILCOM.1984.4794849
Vladan M. Jovanovic, S. Glisic
{"title":"Tracking of Fast Frequency Hopping Spread Spectrum Signals","authors":"Vladan M. Jovanovic, S. Glisic","doi":"10.1109/MILCOM.1984.4794849","DOIUrl":"https://doi.org/10.1109/MILCOM.1984.4794849","url":null,"abstract":"In this paper tracking of the fast frequency hopping spread spectrum signals is analised. It is shown that the traditional \"early-late\" (EL) loop cannot be used in the systems in which the hopping rate becomes comparable to the information rate without the system processing gain degradation. Two modifications of this loope are proposed. The first is the delay compensated EL loop (DCEL) which can be used at moderate hopping rates; the second is the early-late loop with two branches (TBEL) suitable for any hopping rate.","PeriodicalId":375763,"journal":{"name":"MILCOM 1984 - IEEE Military Communications Conference","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1984-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132607182","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: 2
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