{"title":"多普勒频移移动通信用M-DPSK接收机","authors":"F. Nunes, J. Leitao","doi":"10.1109/SPAWC.2001.923832","DOIUrl":null,"url":null,"abstract":"Differential detection of phase-shift keying signals entails the ability to establish a phase reference based on previous symbol(s). In communications strongly affected by the Doppler effect, like those involving non-geostationary satellites, the carrier phase drift within the symbol interval may be significant; thus, a better strategy than averaging the phase over previous symbols is to continuously estimate it along the corresponding interval. We propose a receiver for M-DPSK signals in channels affected by fast fading and Doppler frequency shift. A bank of stochastic nonlinear filters estimates the carrier phase drift and the fading vector, which are modeled as stochastic processes within the symbol interval; a key algorithm driven by the filters' outputs estimates the carrier offset frequency, which is considered a constant parameter in each estimation interval (corresponding to at least two-symbol intervals). Simulations with 4-DPSK show that the receiver performs much better than conventional differential phase detectors; it exhibits short convergence times, being able to cope with large Doppler frequency shifts.","PeriodicalId":435867,"journal":{"name":"2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471)","volume":"81 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2001-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"5","resultStr":"{\"title\":\"M-DPSK receiver for Doppler-shift mobile communications\",\"authors\":\"F. Nunes, J. Leitao\",\"doi\":\"10.1109/SPAWC.2001.923832\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Differential detection of phase-shift keying signals entails the ability to establish a phase reference based on previous symbol(s). In communications strongly affected by the Doppler effect, like those involving non-geostationary satellites, the carrier phase drift within the symbol interval may be significant; thus, a better strategy than averaging the phase over previous symbols is to continuously estimate it along the corresponding interval. We propose a receiver for M-DPSK signals in channels affected by fast fading and Doppler frequency shift. A bank of stochastic nonlinear filters estimates the carrier phase drift and the fading vector, which are modeled as stochastic processes within the symbol interval; a key algorithm driven by the filters' outputs estimates the carrier offset frequency, which is considered a constant parameter in each estimation interval (corresponding to at least two-symbol intervals). Simulations with 4-DPSK show that the receiver performs much better than conventional differential phase detectors; it exhibits short convergence times, being able to cope with large Doppler frequency shifts.\",\"PeriodicalId\":435867,\"journal\":{\"name\":\"2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471)\",\"volume\":\"81 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2001-03-20\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"5\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471)\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1109/SPAWC.2001.923832\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"2001 IEEE Third Workshop on Signal Processing Advances in Wireless Communications (SPAWC'01). Workshop Proceedings (Cat. No.01EX471)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/SPAWC.2001.923832","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
M-DPSK receiver for Doppler-shift mobile communications
Differential detection of phase-shift keying signals entails the ability to establish a phase reference based on previous symbol(s). In communications strongly affected by the Doppler effect, like those involving non-geostationary satellites, the carrier phase drift within the symbol interval may be significant; thus, a better strategy than averaging the phase over previous symbols is to continuously estimate it along the corresponding interval. We propose a receiver for M-DPSK signals in channels affected by fast fading and Doppler frequency shift. A bank of stochastic nonlinear filters estimates the carrier phase drift and the fading vector, which are modeled as stochastic processes within the symbol interval; a key algorithm driven by the filters' outputs estimates the carrier offset frequency, which is considered a constant parameter in each estimation interval (corresponding to at least two-symbol intervals). Simulations with 4-DPSK show that the receiver performs much better than conventional differential phase detectors; it exhibits short convergence times, being able to cope with large Doppler frequency shifts.