Carrier Frequency Offset Estimation Based on Unitary-ESPRIT for Interleaved OFDMA Uplink Systems

A Non-Pilot Aided Iterative Carrier Frequency Offset Estimator Using Optimal Filtering for an Interleaved OFDMA Uplink System

In an uplink transmission of a coded orthogonal frequency division multiple access (C-OFDMA) system, channel estimation, time and frequency synchronization has to be addressed. For this purpose a control data, i.e. a known training sequence called “preamble” and pilot sub-carriers are used. As an alternative to the classic scheme and in order to maximize the data rate, we propose a non-pilot ai...

AP Line Search-based Joint Estimation of Carrier Frequency Offset and Channel Response in Uplink OFDMA

Gravitational Search Algorithm for Low Complexity Carrier Frequency Offset Estimation in Uplink OFDMA Systems

Orthogonal frequency division multiple access (OFDMA) systems in the uplink suffer from multiple access interference (MAI) due to their high sensitivity to frequency misalignments between different users. Moreover, carrier frequency offset (CFO) is a major factor that degrades performance of the OFDMA system. As the maximumlikelihood (ML) estimator is impractical in this context, we introduce a...

A reduced complexity scheme for carrier frequency synchronization in uplink 802.16e OFDMA

Synchronization of the carrier frequency offset (CFO) in the uplink of OFDMA systems is a complex task because each user presents a different CFO. It is performed in two stages: estimation and compensation. Although a few existing schemes already achieve good performance in terms of bit error rate (BER), all of them perform huge amounts of operations, specially during estimation, thus leading t...

Comparative Research Analysis on LTE Techniques to Reduce PAPR in Multi-Carrier Communication Systems

New technologies emerging day by day and main focus to give a better quality of service at low cost. LTE has adopted DFT-spread OFDMA technique as the uplink multiple access schemes which use single carrier modulation and frequency domain equalization. In our research work, we show the PAPR performance of DFT-spreading technique. The performance of PAPR of DFT spreading technique is dependent o...