Fast carrier recovery for burst-mode coherent demodulation using feedforward phase and frequency estimation techniques

Caouras, N.; Morawski, Roman Z.; Le‐Ngoc, Tho

doi:10.1109/ccece.1999.807174

Cited by 5 publications

(2 citation statements)

References 7 publications

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“…Substituting for ω 1 from (9) and using T /T s = 4, we obtain 11) which is less than or equal to 30% of the symbol-rate. Having justified the maximum frequency offset used in this work, we next discuss the procedure for simulating the clock offset.…”

Section: Datamentioning

confidence: 99%

“…Joint carrier recovery and equalization of digitally modulated signals is discussed in [8], [9]. A data-aided carrier recovery algorithm for estimating phase and frequency offsets is discussed in [10], [11] and also in [12], [13] for digital land mobile radio and satellite communication. Detection of bursty QPSK signals at low SNR is described in [14].…”

Section: Introductionmentioning

confidence: 99%

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Design and Development of a Burst Acquisition System for Geosynchronous Satcom Channels

Vasudevan

2015

Preprint

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Section: Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design and Development of a Burst Acquisition System for Geosynchronous Satcom Channels

Vasudevan

2015

Preprint

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Iterative detection of turbo-coded offset QPSK in the presence of frequency and clock offsets and AWGN

Vasudevan

2010

SIViP

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The key contribution of this work is to develop transmitter and receiver algorithms in discrete-time for turbocoded offset QPSK signals. The proposed synchronization and detection techniques perform effectively at an SNR per bit close to 1.5 dB, in the presence of a frequency offset as large as 30 % of the symbol-rate and a clock offset of 25 ppm (parts per million). Due to the use of up-sampling and matched filtering and a feedforward approach, the acquisition time for clock recovery is just equal to the length of the preamble. The carrier recovery algorithm does not exhibit any phase ambiguity, alleviating the need for differentially encoding the data at the transmitter. The proposed techniques are well suited for discrete-time implementation. Index TermsOffset QPSK (quadrature phase shift keying), frequency offset, clock offset, synchronization, matched filtering, additive white Gaussian noise (AWGN). I. INTRODUCTIONGeosynchronous satellites provide line-of-sight communications with the ground stations. Such communication links offer distortionless transmission, with the only impairment being AWGN. Whereas transmit power is not so much of an issue at the ground station, it is a precious commodity on-board the satellite. With the growing demand for satellite broadcast services, it has become necessary for the end users to receive signals directly from the satellite. This calls for a vastly reduced size and cost of the receiving equipment at the ground station (which is usually the users premises or the handset) and superior modulation, coding and synchronization techniques. With the discovery of turbo codes, the aforementioned scenario has become a reality.In order to further improve the performance and bring down the cost of the receivers, we propose offset QPSK as the modulation technique, which allows the use of power efficient non-linear amplifiers and dataaided synchronization algorithms which have a faster acquisition time than the non-data-aided counterparts proposed in [1]. We also use the upsampled version of the matched filter as an interpolator [2], enabling the implementation of a feedforward timing acquisition method, that is faster than the feedback approach discussed and an all-digital implementation of carrier synchronization for digital radio systems is proposed in [18]. A comparison of different carrier recovery techniques is presented in [19]. A carrier recovery algorithm for M -ary QAM with a capability to track large frequency offsets is discussed in [20]. A non-data-aided carrier recovery method for modified 128-QAM is proposed in [21].Timing recovery can be broadly classified into synchronous and asynchronous methods. In the synchronous methods, the local clock at the receiver is regenerated from the incoming signal. Such techniques are implemented in hardware and are usually employed in analog modems [22]. In the asynchronous approach, the local clock at the receiver is free running, due to which the ratio of the receiver sampling frequency to the incoming symbol-rate is not an ...

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All digital CDMA upstream transmitter and baseband VLSI design of head-end receiver for upstream cable networks

Shieu

Wang

Proceedings. IEEE Asia-Pacific Conference on ASIC,

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This paper prcscnts an all digital US-CDMA upstream trailsmittcr. and a head-eml bascband recciwr for upstream cnlde/HFC networks. The upstrcam transmitter supports freit,y of t,hc carrier, QPSK and QAM constellat,ions A\I: variable symhol lat,cs from ltiUkchip/s to S.l2h~lchip/s incrcasing by power of i,rol and direct-digital iq-convcrsiion to achieve a~~u r a t~) arnplitnde and pilase of moduIatiw1. The trnnsnritter connist,s of pulse shaping tilt,er; half-band filter, ciiscadcd intcgrator-comb (CIC) filter-. and iiiverse SINC fillcr. The all digital ~~~~~~~~end hascband reccivcr snpport,s prug~ammable rltiadrnt,urc amplit tide modulntim up t,o (;4QAhl. Fast, t,iming and carrier recovery algorithms a r adoptcd for hnrst, inodc transmission Cudc acquisit,ion can bc iic1iievt.d wit,lrin 2 syiiibols: and tlrc carrier acqtiisitim CAN lie achicicd wit,hin 31 symbols. All digil al 1.iiiiiiig recovery is designed with ~21101,prn syrnhol t i n -ilOOppiri of carrier frcqrieiicy offset. . .illg "trSset tuicrilllce alld tile CBrI.iCr rccuvery cal, collrljcrrs:,tc

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Fast carrier recovery for burst-mode coherent demodulation using feedforward phase and frequency estimation techniques

Cited by 5 publications

References 7 publications

Design and Development of a Burst Acquisition System for Geosynchronous Satcom Channels

Design and Development of a Burst Acquisition System for Geosynchronous Satcom Channels

Iterative detection of turbo-coded offset QPSK in the presence of frequency and clock offsets and AWGN

All digital CDMA upstream transmitter and baseband VLSI design of head-end receiver for upstream cable networks

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