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— This paper proposes and analyzes receiver schemes for multiple-input multiple-output (MIMO) systems with hybrid automatic-repeat-request (HARQ). It is shown by means of analysis as well as computer simulations that the proposed receiver schemes have optimal decoding performance in the sense that all the relevant information is fully used. Also(More)
— This paper presents an exact analysis of the effect of the carrier frequency offset on orthogonal frequency division multiplexing (OFDM) systems for a general multipath fading channel. As is well known, the carrier frequency offset attenuates the desired signal and causes inter-carrier interference, thus reducing the signal-to-noise ratio (SNR). The SNR(More)
— This letter analyzes the effect of the carrier frequency offset on orthogonal frequency division multiplexing (OFDM) systems for multipath fading channels. A simple approximate expression for the average signal-to-noise ratio (SNR) is derived. This approximate expression is shown to be an upper bound of the average SNR for flat fading channels and an(More)
— This paper presents a blind frequency offset estimation algorithm for OFDM systems. The blind algorithm is compared to two popular frequency offset estimation algorithms. The first is the cyclic prefix-based (CPB) algorithm, which is blind but does not perform well in frequency selective channels. The second is the the pilot tone-aided (PTA) algorithm,(More)
—Hybrid Automatic Repeat reQuest (HARQ) schemes are becoming common in wireless systems. In addition to the channel characteristics, several system design considerations need to be taken into account when choosing the particular HARQ scheme to be used. For SISO systems, it has been shown that the coding gain of Incremental Redundancy (IR-) HARQ over Chase(More)
— This paper analyzes the effect of phase noise on orthogonal frequency division multiplexing (OFDM) systems with a focus on time-direction (TD) differential receivers. Both Wiener phase noise and wide-sense stationary (WSS) phase noise are considered. A signal-to-noise ratio (SNR) expression for TD differential receivers is derived in the presence of phase(More)