{"title":"h=1/4的4-CPFSK载波回收方案","authors":"J. A. Schoonees, R. Braun","doi":"10.1109/COMSIG.1993.365861","DOIUrl":null,"url":null,"abstract":"A carrier recovery scheme for 4-level CPFSK with h=1/4 is proposed. It is based on four frequency-switched Costas or in phase-quadrature (I-Q) loops, each synchronized on one of the signalling frequencies. The term \"frequency-switched\" refers to the way which one loop at a time is closed, depending on the data (frequency) estimate after decoding. From the I-Q loop's viewpoint, the CPFSK signal contains the correct signaling frequency on average only a quarter of the time. For the rest of the time, the signal is tracked by the other loops. This is not to be confused with data-aided or decision-feedback synchronization. Each loop resembles the conventional QPSK Costas loop synchronizer, with additional circuitry to rotate the signal space. Simulation results are presented.<<ETX>>","PeriodicalId":398160,"journal":{"name":"1993 IEEE South African Symposium on Communications and Signal Processing","volume":"43 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1993-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":"{\"title\":\"A carrier recovery scheme for 4-CPFSK with h=1/4\",\"authors\":\"J. A. Schoonees, R. Braun\",\"doi\":\"10.1109/COMSIG.1993.365861\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"A carrier recovery scheme for 4-level CPFSK with h=1/4 is proposed. It is based on four frequency-switched Costas or in phase-quadrature (I-Q) loops, each synchronized on one of the signalling frequencies. The term \\\"frequency-switched\\\" refers to the way which one loop at a time is closed, depending on the data (frequency) estimate after decoding. From the I-Q loop's viewpoint, the CPFSK signal contains the correct signaling frequency on average only a quarter of the time. For the rest of the time, the signal is tracked by the other loops. This is not to be confused with data-aided or decision-feedback synchronization. Each loop resembles the conventional QPSK Costas loop synchronizer, with additional circuitry to rotate the signal space. Simulation results are presented.<<ETX>>\",\"PeriodicalId\":398160,\"journal\":{\"name\":\"1993 IEEE South African Symposium on Communications and Signal Processing\",\"volume\":\"43 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1993-08-06\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"1\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"1993 IEEE South African Symposium on Communications and Signal Processing\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1109/COMSIG.1993.365861\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"1993 IEEE South African Symposium on Communications and Signal Processing","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/COMSIG.1993.365861","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
A carrier recovery scheme for 4-level CPFSK with h=1/4 is proposed. It is based on four frequency-switched Costas or in phase-quadrature (I-Q) loops, each synchronized on one of the signalling frequencies. The term "frequency-switched" refers to the way which one loop at a time is closed, depending on the data (frequency) estimate after decoding. From the I-Q loop's viewpoint, the CPFSK signal contains the correct signaling frequency on average only a quarter of the time. For the rest of the time, the signal is tracked by the other loops. This is not to be confused with data-aided or decision-feedback synchronization. Each loop resembles the conventional QPSK Costas loop synchronizer, with additional circuitry to rotate the signal space. Simulation results are presented.<>
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