In this contribution, we investigate the effect of carrier phase errors on the performance of orthogonal frequency division multiplexing (OFDM) and multicarrier code-division multiple access (MC-CDMA). We show that OFDM and MC-CDMA have essentially the same sensitivities to carrier phase errors. A constant carrier phase offset yields no degradation of the system performance. We show that OFDM a...

We address the problem of frequency synchronization in OFDM-based communications systems in the context of frequency-selective fading channels. Frequency offsets are estimated by inserting null sub-carriers into a single OFDM block. The paper clarifies issues related to acquisition range and identifiability of carrier frequency offset (CFO), and performance of estimators. A deterministic maximu...

A novel method is presented to estimate the frame time and carrier frequency offset in orthogonal frequency multiplexing (OFDM) systems [1] using a variable number of time-domain pilot signals. The performance and computational intensity of the proposed system is compared to a traditional OFDM system using redundant information from the cyclic prefix [2].

In this paper, a method for CFO/RFO estimation based on proportional coefficients extraction in OFDM system is proposed, which may be applied to any pilot symbol pattern. Keywords—OFDM (Orthogonal Frequency Division Multiplexing), CFO (Carrier Frequency Offset, Redundancy Frequency Offset), proportional coefficient extraction.

In this contribution, we consider the effect of a carrier frequency offset on the performance of MC-CDMA and MC-DS-CDMA, which are both a combination of the multicarrier transmission technique and the CDMA multiple access technique. We show that both systems strongly degrade in the presence of a carrier frequency offset. Furthermore, we show that, for given spreading factor, the MC-DS-CDMA syst...

A carrier offset correction scheme based on Maximum Likelihood (ML) method for the downlink of an Orthogonal Variable bit rate Multicarrier-CDMA (MCCDMA) scheme in a fast frequency selective Rayleigh fading channel is proposed and discussed. The proposed methodology assumes perfect knowledge of phase offset, whereas an Equal Gain Combining (EGC) scheme is considered for MC-CDMA detection. Resul...

rthogonal frequency division multiplexing (OFDM) has been recently adopted by major manufacturers and by standardization bodies for a wide range of wireless and wireline applications ranging from digital video/audio broadcasting to power-line communications. The major virtues of OFDM are 1) its resilience to multipath propagation providing a viable low-complexity and optimal (in the maximum lik...