Description: We address the problem of blind carrier frequency-offset (CFO) estimation in quadrature amplitude modulation,
phase-shift keying, and pulse amplitude modulation
communications systems.We study the performance of a standard
CFO estimate, which consists of first raising the received signal to
the Mth power, where M is an integer depending on the type and
size of the symbol constellation, and then applying the nonlinear
least squares (NLLS) estimation approach. At low signal-to noise
ratio (SNR), the NLLS method fails to provide an accurate CFO
estimate because of the presence of outliers. In this letter, we derive
an approximate closed-form expression for the outlier probability.
This enables us to predict the mean-square error (MSE) on CFO
estimation for all SNR values. For a given SNR, the new results
also give insight into the minimum number of samples required in
the CFO estimation procedure, in order to ensure that the MSE
on estimation is not significantly affected by the outliers. Platform: |
Size: 1265450 |
Author:吴大亨 |
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Description: 偏移四相移相键控调制，也就是OQPSK，输出信号为OQPSK调制信号的复包络-Offset four-phase phase shift keying modulation, that is, OQPSK, the output signal for the OQPSK modulated signal complex envelope Platform: |
Size: 1024 |
Author:傲然寒风 |
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Description: We address the problem of blind carrier frequency-offset (CFO) estimation in quadrature amplitude modulation,
phase-shift keying, and pulse amplitude modulation
communications systems.We study the performance of a standard
CFO estimate, which consists of first raising the received signal to
the Mth power, where M is an integer depending on the type and
size of the symbol constellation, and then applying the nonlinear
least squares (NLLS) estimation approach. At low signal-to noise
ratio (SNR), the NLLS method fails to provide an accurate CFO
estimate because of the presence of outliers. In this letter, we derive
an approximate closed-form expression for the outlier probability.
This enables us to predict the mean-square error (MSE) on CFO
estimation for all SNR values. For a given SNR, the new results
also give insight into the minimum number of samples required in
the CFO estimation procedure, in order to ensure that the MSE
on estimation is not significantly affected by the outliers. Platform: |
Size: 1265664 |
Author:吴大亨 |
Hits:
Description: Minimum Shift Keying (MSK), uses two frequencies which are separated by 1/2T and phase discontinuity is avoided in symbol boundaries. Further, MSK transmission can also be visualized as a variant of offset-QPSK technique, where sinusoidals are used for pulse shaping instead of rectangular.
-Minimum Shift Keying (MSK), uses two frequencies which are separated by 1/2T and phase discontinuity is avoided in symbol boundaries. Further, MSK transmission can also be visualized as a variant of offset-QPSK technique, where sinusoidals are used for pulse shaping instead of rectangular.
Platform: |
Size: 1024 |
Author:zeusZZ |
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Description: This paper considers frequency-domain receiver
design for OQPSK signals (Offset Quaternary Phase
Shift Keying). It is shown that conventional QPSK receivers
are not suitable to OQPSK schemes since they
lead to significant interference between in-phase (I) and
quadrature (Q) components. To overcome this problem
we propose several linear receivers where there is no
I-Q interference. Our receivers are suitable to OQPSK
schemes, significantly outperforming frequency-domain receivers
designed for QPSK modulations. Platform: |
Size: 113664 |
Author:吕立圣 |
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Description: This paper considers the design of linear
frequency-domain receivers with oversampling for OQPSK
(Offset Quaternary Phase Shift Keying) signals. Based on
a receiver structure able to eliminate the residual interference
between in-phase (I) and quadrature (Q) components
at the sampling instants, a method that minimizes the
overall residual ISI (Inter-Symbol Interference) plus IQI
(I-Q interference) is proposed. Therefore, this receiver significantly
outperforms previous frequency-domain OQPSK
receivers. Platform: |
Size: 284672 |
Author:吕立圣 |
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Description: Offset quadrature phase-shift keying (OQPSK) is a variant of phase-shift keying modulation using 4 different values of the phase to transmit. It is sometimes called Staggered quadrature phase-shift keying (SQPSK). Platform: |
Size: 1024 |
Author:kane |
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Description: This article contains analyses of the performance of various carrier synchronization
loops for offset quadrature phase-shift-keying (OQPSK) modulation, all
motivated in one form or another by the maximum a posteriori (MAP) estimation
of carrier phase. When they are implemented as either high or low signal-to-noise
ratio (SNR) approximations to the generic implementation suggested by the MAP
estimation of carrier phase for an OQPSK signal, it is shown that the loops behave
more like biphase than quadriphase loops in that they only exhibit a 180-deg phase
ambiguity rather than the 90-deg phase ambiguity typical of the latter. Platform: |
Size: 450560 |
Author:Alexandr |
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Search - offset phase shift keying