2011 **Abstract:** In this paper, challenges regarding the provision of channel state information (CSI) and carrier frequency synchronization for orthogonal frequency division multiplexing (OFDM) systems with null subcarriers are addressed. We propose novel maximum likelihood (ML) based schemes that estimate the aggregate effects of the CFO and channel by using two successive OFDM preambles. In the presented scheme, CFO is estimated by considering the phase rotation between two consecutive received OFDM preambles. Both single in…

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“…To formulate reasonable constraints for the preamble design, we consider a noise free frequency selective fading channel and no phase errors, that is, when = 0. Frequency domain representation of the received signal y m without phase errors can be written as [7] …”

confidence: 99%

“…To formulate reasonable constraints for the preamble design, we consider a noise free frequency selective fading channel and no phase errors, that is, when = 0. Frequency domain representation of the received signal y m without phase errors can be written as [7] …”

confidence: 99%

“…We utilize some criteria to design preamble that minimizes the channel estimate MSE while suppressing the interference replica caused by the I/Q imbalances. To estimate the residual CFO, we adopt an ML estimator in [7] that utilizes two consecutive OFDM preambles.…”

confidence: 99%

“…In multiple input multiple output (MIMO) scenario where disjoint pilot symbols are utilized for each transmit antenna, the CE-based algorithm can efficiently design pilot placement for each antenna by adopting the algorithm in [24].…”

mentioning

confidence: 99%