Based on the scenario assumed that the CFO (carrier frequency offset), which is caused by the ICI (inter-carrier interference), exists in the environments of short-term fading, a multi-dimension combining (M-D combining) receiver for an MC-CDMA (multi-carrier coded-division multiple-access) system is designed and proposed considerably to overcome the system performance degradation. It is worthw...

In this paper, we propose a new differential multiple-input multiple-output (MIMO) single-carrier system with frequency-domain equalization (SC-FDE) aided by the insertion of cyclic prefix. This block transmission system not only inherits all the merits of the single-input single-output (SISO) SC-FDE system, but is also equipped with a differential space-time block coding (DSTBC) such as to com...

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...

~~~. ~~~~~~ ~ . . ~ ~ ~ ~ ~ ~ ~ . ~ ~ ~ ~ ~ ~ . . near the Cram&-Rao bound in the variance of estimation errors: Simulations of several estimation algorithms in a estimation. Also the complex data of the pilot subcarriers, instead of their phases, are averaged. However, these multipath fading channel show'that this algorithm provides the most accurate estimation in both the carrier frequency of...

Future wireless communication system is expected to have a high data rate transmission. OFDM is a promising candidate for achieving high data rates in mobile environment because of its multicarrier modulation technique. A well-known problem of OFDM is its sensitivity to frequency offset between the transmitted and received carrier frequencies. This carrier frequency offset (FO) causes loss of o...

We investigate a novel nondata-aided method for jointly estimating timing and carrier frequency offset in MSKtype modulation. The algorithm has a feedforward structure and lends itself to a simple digital implementation. Its estimation accuracy depends on a design parameter that may be varied to trade performance for computational complexity. Setting the parameter to unity yields a synchronizat...

In time-varying frequency selective channels, to obtain high-rate joint time-frequency diversity, linear dispersion coded orthogonal frequency division multiplexing (LDC-OFDM), has recently been proposed. Compared with OFDM systems, single-carrier systems may retain the advantages of lower PAPR and lower sensitivity to carrier frequency offset (CFO) effects, which motivates this paper to invest...

Carrier frequency offset (CFO) in OFDM systems results in loss of channel orthogonality and hence degrades the system’s performance. In this paper, we propose a new method for joint CFO/channel estimation for OFDM systems with two receive antennas. Our method avoids the complexity of full search methods in one or two dimensions. Using one training OFDM symbol and utilizing the knowledge of the ...

In this paper we propose a new space diversity scheme for broadband PLC systems using orthogonal space-time block coding (OSTBC) transmission combined with single-carrier frequency-domain equalization (SC-FDE). To apply this diversity technique to PLC channels, we first propose a new technique for combining SC-FDE with OSTBCs applicable to all dispersive multipath channels impaired by impulsive...

Carrier Frequency Offset Estimation for Orthogonal FrequencyDivision Multiplexing Systems Xiang Nian Zeng, Ph.D. Concordia University, 2008 Orthogonal frequency division multiplexing (OFDM) is an attractive modulation scheme used in wideband communications because it essentially transforms the frequency selective channel into a flat fading channel. Furthermore, the combination of multiple-input...