Iterative Code-Aided ML Phase Estimation and Phase Ambiguity Resolution
نویسندگان
چکیده
منابع مشابه
Iterative Code-Aided ML Phase Estimation and Phase Ambiguity Resolution
As many coded systems operate at very low signal-to-noise ratios, synchronization becomes a very difficult task. In many cases, conventional algorithms will either require long training sequences or result in large BER degradations. By exploiting code properties, these problems can be avoided. In this contribution we present several iterative maximum-likelihood (ML) algorithms for joint carrier...
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We present a novel maximum-likelihood (ML) joint frame synchronization and carrier phase ambiguity resolution algorithm for coded systems that exploits the code properties by accepting soft information from the MAP decoder. Simulation results are presented for turbo codes, and are compared to performance results of a conventional algorithm that does not use the code properties. We show that cod...
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This contribution considers the data-aided (DA) maximum-likelihood carrier phase ambiguity resolution algorithm for coded M-PSK signaling. We derive analytical performance results of the algorithm when operating in the presence of phase estimation errors. As the use of a pilot sequence reduces the spectral efficiency of the system, we determine analytically the minimal pilot sequence length for...
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Several code-aided algorithms for phase estimation have recently been proposed. While some of them are ad-hoc, others are derived in a systematic way. The latter can be divided into two different classes: phase estimators derived from the expectation-maximization (EM) principle and estimators that are approximations of the sum-product message passing algorithm. In this paper, the main differenc...
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Low-density parity-check (LDPC) codes provide capacity approaching performances with very long codes in a coherent channel. However, as the block length increases, their performance becomes worse with residual frequency offsets. Residual frequency offsets can be tackled with sub-block decoding and LDPC code-aided phase ambiguity resolution for binary phaseshift keying (BPSK) signals. Sub-block ...
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ژورنال
عنوان ژورنال: EURASIP Journal on Advances in Signal Processing
سال: 2005
ISSN: 1687-6180
DOI: 10.1155/asp.2005.981