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In orthogonal frequency-division multiplexing (OFDM) systems operating over rapidly time-varying channels, the orthogonality between subcarriers is destroyed leading to inter-carrier interference (ICI) and resulting in an irreducible error floor. In this paper, a new and low-complexity maximum a posteriori probability (MAP) detection algorithm is proposed for OFDM systems operating over rapidly time-varying...
This paper proposes a low-complexity iterative detection scheme with cooperative transmission for single-carrier frequency-domain equalization (SC-FDE). To increase the spectral efficiency, a node, which acts as a relay, simultaneously transmits its own data block and the data block from the other node. For user separation, each data block is interleaved by a user-specific interleaver. At the destination,...
In this paper we propose a synchronization method to compensate for the effect of frequency offset and phase noise generated by local oscillator instabilities for a Turbo Frequency Domain Equalizer (TFDE). TFDE is considered as an efficient equalization method which benefits from both good performance of iterative systems and reasonable complexity due to performing equalization in the frequency domain...
In this paper, we propose a maximum-likelihood sequence estimation (MLSE) procedure for transmission over rapidly time-varying channels. The time-varying channel is approximated using the basis expansion model (BEM). Using the BEM allows for an efficient implementation of the Viterbi algorithm (VA). This stems from the fact that with the BEM the time-varying channel is approximated over a window of...
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