Generalized frequency division multiplexing (GFDM) is a block filtered multicarrier modulation scheme recently proposed for future wireless communication systems. It generalizes the concept of orthogonal frequency division multiplexing (OFDM), featuring multiple circularly pulse-shaped subsymbols per subcarrier. This paper presents an algorithm for GFDM synchronization and investigates the use ...

In the paper “Finite-SNR Diversity-Multiplexing Tradeoff for Network Coded Cooperative OFDMA Systems”, the authors adopt a recently proposed subcarrier allocation algorithm aiming at providing optimal frequency diversity to an OFDMA-based network with network-coded cooperation (NCC), where P source nodes transmit independent information to a common destination with the help of M relay nodes, in...

Orthogonal frequency division multiplexing (OFDM) and singlecarrier frequency domain equalization (SC-FDE) are two commonly adopted modulation schemes for frequency-selective channels. Compared to SC-FDE, OFDM generally achieves higher data rate, but at the cost of higher transmit signal peak-to-average power ratio (PAPR) that leads to lower power amplifier efficiency. This paper proposes a new...

This paper focuses on the impact of Optical Beat Interference (OBI) on the performance of subcarrier multiplexed optical transmission system for the application on radio link via optical fiber. Performance results are evaluated for QPSK modulation of Microwave subcarriers with digital NRZ coded random data patterns. A suitable bandwidth of 890 – 950 MHz is selected for subcarriers and channel b...

This paper considers the uplink performance of a multi-user massive multiple-input multiple-output orthogonal frequency-division multiplexing (MIMO-OFDM) system with mobile users. Mobility brings two major problems to MIMO-OFDM system: inter carrier interference (ICI) and channel aging. In practice, it is common allot multiple contiguous subcarriers user as well schedule users on each subcarrie...

<p>Precoding in orthogonal frequency division multiplexing (OFDM) system proved to reduce the peak-to-average power ratio (PAPR), so that it improves BER. However, from existing literature, effect of carrier offset (CFO), in-phase and quadrature (IQ) imbalance on precoded wireless OFDM systems has not been carried out. Therefore, this study evaluated (P-OFDM) performance by considering im...

Multiuser orthogonal frequency division multiplexing (OFDM) is a very promising multiple access technique to efficiently utilize limited RF bandwidth and transmit power in wideband transmission over multipath fading channels. When a wideband spectrum is shared by multiple users in multiuser OFDM-based systems, different users may experience different fading conditions at all subcarriers. Each u...

In distributed antenna system (DAS), since the distances from the remote antenna units (RAUs) to the mobile are different, the transmitted power of pilot symbol in orthogonal frequency division multiplexing (OFDM) needs to be optimized to provide a reliable channel estimation for the purpose of coherent detection. In this paper, we present a novel pilot power allocation strategy for OFDM in DAS...

Abstract— The demand for high speed data services have been increasing day by day, a very promising approach is to use Multiple-Input Multiple-Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM). In this paper adaptive bit loading is applied to MIMO-OFDM, to obtain a bit and power allocation for each subcarrier assuming instantaneous channel knowledge. Relying on the available partial...

This paper presents a technique for frequency offset estimation for polynomial cancellation coded orthogonal frequency division multiplexing with symbols overlapped in the time domain (overlap PCC-OFDM) in the presence of phase noise. The frequency offset estimator is designed based on the subcarrier pair imbalance (SPI) caused by frequency offset. The estimation is performed in the frequency d...