Adaptive carrier recovery systems for digital data communications receivers

Cupo, R.; Gitlin, Richard D.

doi:10.1109/49.44576

Cited by 53 publications

(11 citation statements)

References 9 publications

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“…Falconer first introduced the first order PLL to combat phase noise [6]. Cupo and Gitlin improve the results by utilizing a second order PLL [7]. These early approaches are very simple and require little hardware resource consumption.…”

Section: Introductionmentioning

confidence: 98%

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Phase noise mitigation in high frequency band SC-MIMO systems

Xie

Gui

Xiong

2011

2011 International Conference on Wireless Communications and Signal Processing (WCSP)

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This paper proposes a phase noise cancellation scheme in high frequency band single-carrier (SC) multiple input and multiple output (MIMO) systems by employing a phase tracking loop. Due to the level of noisy oscillators grow quadratically in terms of corresponding carrier frequency, the overall system performance in 6-15GHz band is seriously deteriorated by the phase noise. In the case, a simple phase tracking loop in combination with a modified equalizer is carefully designed for SC-MIMO systems. Simulation results indicate that the proposed mitigation strategy could effectively suppress the performance degradation effects from the phase noise. The analytical results indicate that the symbol-error-rate (SER) performance is improved in contrast to the scheme without phase tracking loop.

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Section: Introductionmentioning

confidence: 98%

“…Adaptive schemes are first introduced by Gitlin [7]. He models the phase noise sinusoid form and propose finite impulse response-adaptive line enhancer (FIR-ALE) scheme to compensate the phase noise.…”

Section: Introductionmentioning

confidence: 99%

Phase noise mitigation in high frequency band SC-MIMO systems

Xie

Gui

Xiong

2011

2011 International Conference on Wireless Communications and Signal Processing (WCSP)

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“…Henceforth, we assume that |ω 3 | ≤ ω 1 to avoid aliasing (see also (10)). We now study the effect of T ′ s on the complex baseband signals(·) in (16).…”

Section: +1mentioning

confidence: 99%

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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“…The BPSK waveform whose phases are generally not continuous at the bit boundaries has a constant envelope and frequency. Unlike the simple conventional BPSK modulator, the coherent BPSK demodulator must generate the reference signal [16][17][18], which is synchronous to the received signal in frequency and phase in order to correctly demodulate the transmitted signal from the transmitter. For PSK signals, there is no spectral line at its carrier frequency, so there are two main types of carrier synchronizers, the th M power loop, and the Costas loop [19].…”

Section: Principle Of Bpsk Transceivermentioning

confidence: 99%

A New Absolute Phase Detection Scheme

Saechia

Pradabpet

Koseeyaporn

et al. 2016

Journal of Signal Processing

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In this paper, the new absolute phase detection scheme (APDS) is presented. With a simple mathematical analysis, the proposed APDS algorithm is capable of accurately detecting the absolute phase without using reference phase like other conventional techniques. The other massive benefit of using the proposed APDS scheme is its range-expansion flexibility for each application depending on the selected traditional PD. Based on the proposed APDS, BPSK and QPSK demodulated simulations, accurately recovering 16-bit-information data, are implemented with the blind carrier recovery methods. Also, the analog multiplier PD was selected in order to verify the proposed QPSK demodulator under the AWGN channel. It is found that the output phase is irrelevantly disturbed by additive white Gaussian noise. For the QPSKdemodulated PSPICE simulation, the proposed technique is more compatible with the frame processing manner rather than the real time processing. From both PSPICE and Matlab simulations for BPSK and QPSK demodulation the proposed APDS scheme provides convenience, advantages, and acceptable results in comparison to other traditional techniques.

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Adaptive carrier recovery systems for digital data communications receivers

Cited by 53 publications

References 9 publications

Phase noise mitigation in high frequency band SC-MIMO systems

Phase noise mitigation in high frequency band SC-MIMO systems

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

A New Absolute Phase Detection Scheme

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