IEEE Transactions on Communication Technology最新文献

Pulse-Code Modulation to Voice Conversion - Binary Rate Multiplier Differential Pulse-Code-Modulation Decoder 脉冲编码调制到语音转换-二进制速率乘法器差分脉冲编码调制解码器

IEEE Transactions on Communication Technology Pub Date : 1971-12-01 DOI: 10.1109/TCOM.1971.1090791

C. Weller

引用次数: 1

Subsurface Electromagnetic Telecommunication - A Review 地下电磁通信综述

IEEE Transactions on Communication Technology Pub Date : 1971-12-01 DOI: 10.1109/TCOM.1971.1090754

R. Gabillard, P. Degauque, James R. Wait

引用次数: 46

Nonsystematic convolutional codes for sequential decoding in space applications 空间应用中顺序解码的非系统卷积码

IEEE Transactions on Communication Technology Pub Date : 1971-10-01 DOI: 10.1109/TCOM.1971.1090720

J. Massey, D. Costello

{"title":"Nonsystematic convolutional codes for sequential decoding in space applications","authors":"J. Massey, D. Costello","doi":"10.1109/TCOM.1971.1090720","DOIUrl":"https://doi.org/10.1109/TCOM.1971.1090720","url":null,"abstract":"Previous space applications of sequential decoding have all employed convolutional codes of the systematic type where the information sequence itself is used as one of the encoded sequences. This paper describes a class of rate 1/2 nonsystematic convolutional codes with the following desirable properties: 1) an undetected decoding error probability verified by simulation to be much smaller than for the best systematic codes of the same constraint length; 2) computation behavior with sequential decoding verified by simulation to be virtually identical to that of the best systematic codes; 3) a \"quick-look-in\" feature that permits recovery of the information sequence from the hard-decisioned received data without decoding simply by modulo-two addition of the received sequences; and 4) suitability for encoding by simple circuitry requiring less hardware than encoders for the best systematic codes of the same constraint length. Theoretical analyses are given to show 1) that with these codes the information sequence is extracted as reliably as possible without decoding for nonsystematic codes and 2) that the constraints imposed to achieve the quicklook-in feature do not significantly limit the error-correcting ability of the codes in the sense that the Gilbert bound on minimum distance can still be attained under these constraints. These codes have been adopted for use in several forthcoming space missions.","PeriodicalId":134522,"journal":{"name":"IEEE Transactions on Communication Technology","volume":"377 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1971-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129095936","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: 80

Adaptive Delta Modulator for Telephony and Its Application to the Adaptifon System - An Alternative Implementation of the Lincompex Concept 电话用自适应增量调制器及其在自适应系统中的应用——Lincompex概念的另一种实现

IEEE Transactions on Communication Technology Pub Date : 1971-08-01 DOI: 10.1109/TCOM.1971.1090690

J. Betts

引用次数: 2

Subscriber Loop Multiplexer - A High Pair Gain System for Upgrading and Growth in Rural Areas 用户环路多路复用器-用于农村地区升级和增长的高对增益系统

IEEE Transactions on Communication Technology Pub Date : 1971-08-01 DOI: 10.1109/TCOM.1971.1090689

I. Mcnair

{"title":"Subscriber Loop Multiplexer - A High Pair Gain System for Upgrading and Growth in Rural Areas","authors":"I. Mcnair","doi":"10.1109/TCOM.1971.1090689","DOIUrl":"https://doi.org/10.1109/TCOM.1971.1090689","url":null,"abstract":"The subscriber loop multiplexer is a combined carrier and switching system for serving 80 main stations on 24 channels. The system has been designed for use in rural areas to handle growth and upgrading from multiparty service toward individual service. The system consists of a control terminal and up to six remote terminals located near the customers being served. The system is digital and uses a bit rate of 1.544 Mbit/s for the repeatered line interconnecting the terminals. The system has many maintenance provisions and alarms that have been economically achieved through digital integrated circuits. The test desk can initiate a series of tests on the voice frequency loop extending from the remote terminal to the customer. Delta modulation provides a simple and economic conversion between analog and digital forms. At the remote terminals each main station Served has an individual modem allowing equipment to be added as required to serve customers. The system utilizes 14 codes of beam-lead integrated circuits of which 10 are bipolar and 4 are insulated-gate field-effect transistor (IGFET). The IGFETs provide the adaptive delta modulation control and also perform the time division switching function at the remote terminals.","PeriodicalId":134522,"journal":{"name":"IEEE Transactions on Communication Technology","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1971-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116011690","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: 15

Automatic Receiver Spurious Response Measurements - Some Preliminary Results 自动接收机杂散响应测量。一些初步结果

IEEE Transactions on Communication Technology Pub Date : 1971-08-01 DOI: 10.1109/TCOM.1971.1090691

R. Huenemann, L. Chapman

引用次数: 1

Performance of Simple Multiplexer - Concentrators for Data Communication 用于数据通信的简单多路复用集中器的性能

IEEE Transactions on Communication Technology Pub Date : 1971-04-01 DOI: 10.1109/TCOM.1971.1090632

H. Rudin

引用次数: 22

An Analysis of the Phase Coherent - Incoherent Output of the Bandpass Limiter 带通限幅器相位相干-非相干输出分析

IEEE Transactions on Communication Technology Pub Date : 1971-02-01 DOI: 10.1109/TCOM.1971.1090611

J. Springett, M. Simon

引用次数: 52

Power Allocation - Rapidly Varying Phase Error 功率分配-快速变化的相位误差

IEEE Transactions on Communication Technology Pub Date : 1969-04-01 DOI: 10.1109/TCOM.1969.1090076

J. Hayes, W. Lindsey

引用次数: 5

The Improvement of Digital HF Communication Through Coding: II - Tandem Interleaved Cyclic Coding 通过编码改进数字高频通信:二串交错循环编码

IEEE Transactions on Communication Technology Pub Date : 1968-12-01 DOI: 10.1109/TCOM.1968.1089918

K. Brayer

引用次数: 11