This paper focuses on phase noise-impaired communications. An efficient Maximum A-posteriori Probability (MAP) iterative synchronization algorithm, where detection and decoding are performed separately from phase estimation, is proposed. This approach has the following key advantages: (i) its computational complexity is relatively low and its performance is near optimal; (ii) it requires very limited statistical knowledge of the phase noise process; and (iii) it enables the direct use of 'off-the-shelf' demodulation and decoding blocks. These features are particularly attractive from the implementation viewpoint, as they lead to the design of effective pragmatic high-order coded modulated schemes. The proposed iterative synchronization and decoding algorithm, evaluated for Low-Density Parity-Check (LDPC)-coded pilot symbol-assisted Quadrature Amplitude Modulation (QAM) schemes, entails a negligible energy efficiency loss with respect to optimized joint decoding and phase estimation approaches, with significantly lower computational complexity
In this paper, an innovative Minimum Mean Square Error (MMSE)-based iterative synchronization algorithm is devised for a dually-polarized wireless link, affected by phase noise and Cross-Polarization Interference (XPI), with independent transmission streams over the two polarizations. A novel perpolarization soft decision-directed iterative receiver with separate A Posteriori Probability (APP)-based synchronization and decoding is proposed. The key idea of the proposed synchronization algorithm relies on an MMSE-based (master-slave) phase estimation followed by cancellation of the XPI on the polarization of interest. An attractive feature of the proposed approach is that it requires no statistical knowledge of the phase noise process. The performance of the proposed iterative receiver is investigated with a pilot symbol-assisted Low-Density Parity-Check (LDPC)-coded Quadrature Amplitude Modulation (QAM) scheme
This study discusses synchronisation in phase noise-impaired spectrally efficient communication systems employing high-order modulations. In particular, an iterative receiver, where demodulation and decoding are separate from maximum a posteriori probability (MAP) synchronisation, is presented. The authors' separate approach is tailored to the design of pragmatic iterative receiver schemes employing 'off-the-shelf' demodulation and decoding blocks. This allows full compatibility with already existing systems, which is attractive from the implementation viewpoint. The proposed MAP synchronisation algorithm also requires very limited knowledge of the phase noise process and achieves near coherent performance with moderate computational complexity. Although the approach is very general, the authors discuss its performance for low-density parity-check-coded pilot symbol-aided quadrature amplitude modulation schemes, demonstrating that a significantly lower computational complexity can be achieved with respect to benchmark joint receivers
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