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The performance of an OFDM system can be strongly degraded by the presence of random phase noise. In the proposed compensation scheme, we jointly estimate channel and phase noise and data. This estimation consists of three stages. In the first stage, phase noise, channel and transmitted data are initially estimated by using of linear interpolation method. In the second stage, with Linear Least Square...
A low complexity time domain channel estimation technique for OFDM systems is proposed. It uses training symbols to estimate the channel impulse responses (CIR) via circular cross-correlation. A CIR search window technique is also proposed to optimise the accuracy of synchronisation and channel estimation. The output of the search window can also be used for the estimation of channel delay spread...
We propose a novel method that considerably reduces the Peak-to-Average Power Ratio (PAPR) in Orthogonal Frequency Division Multiplexing (OFDM) systems, yielding a quasi constant signal envelope in the time domain (PAPR close to 1 dB). The proposed technique, named Rotation Invariant Subcarrier Mapping (RISM), is a novel scheme for subcarriers data mapping, where the symbols belonging to the modulation...
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