{"title":"近地轨道个人通信卫星系统的扩频同步","authors":"David E. Dodds, Michael Moher","doi":"10.1109/CCECE.1995.528065","DOIUrl":null,"url":null,"abstract":"This paper investigates required signal structure and receiver code synchronization techniques for satellite based CDMA personal communications systems. A signal structure is proposed in which different CDMA codes are used to differentiate each satellite (as in the GPS system) and different phases of one code (as in the IS-95 standard) to differentiate spot beams on one satellite. Due to satellite overlap, the number of effective co-users in each cell can be two or three times the number of actual cell users which leads to a required spreading gain in the order of 20 times the actual number of cell users. The paper investigates correlator receiver structures and shows that the optimum correlation time is 400-1000 chips when the number of effective co-users is 100.","PeriodicalId":158581,"journal":{"name":"Proceedings 1995 Canadian Conference on Electrical and Computer Engineering","volume":"9 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1995-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"8","resultStr":"{\"title\":\"Spread spectrum synchronization for a LEO personal communications satellite system\",\"authors\":\"David E. Dodds, Michael Moher\",\"doi\":\"10.1109/CCECE.1995.528065\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"This paper investigates required signal structure and receiver code synchronization techniques for satellite based CDMA personal communications systems. A signal structure is proposed in which different CDMA codes are used to differentiate each satellite (as in the GPS system) and different phases of one code (as in the IS-95 standard) to differentiate spot beams on one satellite. Due to satellite overlap, the number of effective co-users in each cell can be two or three times the number of actual cell users which leads to a required spreading gain in the order of 20 times the actual number of cell users. The paper investigates correlator receiver structures and shows that the optimum correlation time is 400-1000 chips when the number of effective co-users is 100.\",\"PeriodicalId\":158581,\"journal\":{\"name\":\"Proceedings 1995 Canadian Conference on Electrical and Computer Engineering\",\"volume\":\"9 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1995-09-05\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"8\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Proceedings 1995 Canadian Conference on Electrical and Computer Engineering\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1109/CCECE.1995.528065\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Proceedings 1995 Canadian Conference on Electrical and Computer Engineering","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/CCECE.1995.528065","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Spread spectrum synchronization for a LEO personal communications satellite system
This paper investigates required signal structure and receiver code synchronization techniques for satellite based CDMA personal communications systems. A signal structure is proposed in which different CDMA codes are used to differentiate each satellite (as in the GPS system) and different phases of one code (as in the IS-95 standard) to differentiate spot beams on one satellite. Due to satellite overlap, the number of effective co-users in each cell can be two or three times the number of actual cell users which leads to a required spreading gain in the order of 20 times the actual number of cell users. The paper investigates correlator receiver structures and shows that the optimum correlation time is 400-1000 chips when the number of effective co-users is 100.
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