Multiple reception antenna assisted Space Division Multiple Access (SDMA) techniques designed for wireless Orthogonal Frequency Division Multiplexing (OFDM) systems have recently drawn wide interests. These techniques facilitate the implementation of effective multi-user detection algorithms at the receiver. A prerequisite of their operation is the availability of an estimate of the channels’ f...

Multiple Input and Multiple Output (MIMO) and Orthogonal Frequency Division Multiplexing (OFDM) system have the potential to achieve very high capacity depending on the propagation environment. The objective of this paper resource allocation on LTE using is the adaptive resource allocation in MIMOOFDM system using the water filling algorithm. Water filling solution is implemented for allocating...

Abstract This paper describes the design and implementation of a 39 GHz 256-element hybrid active phased array antenna system with 16 individual digital transceivers, its wireless multi-user, multi-input, multi-output verification. An earlier version this was presented at 2021 51st European Microwave Conference published in Proceedings [1]. Using prototype device, single carrier transmission te...

In this paper, a transform domain processing (TDP) based channel estimation method for orthogonal frequency-division multiplexing (OFDM) Radio-over-Fiber (RoF) systems is proposed. Theoretically investigation shows that TDP can greatly reduce the number of required training symbols. An 8 x 4.65 Gb/s multi-user OFDM RoF system over 40 km fiber link and 60 GHz wireless link is experimentally demo...

This paper proposes an efficient spectrum sensing scheme for OFDM signal transmitted by the primary user with its Cyclic Prefix Correlation Coefficient (CPCC) based on multi-antenna. Inspired by the Maximum-minimum Eigenvalue Detection (MMED) algorithm, a CPCC-based MMED spectrum sensing algorithm is proposed. This algorithm uses inherent property of Cyclic Prefix (CP) resulting in nonzero corr...

We propose a nonlinear phase-quantized constantenvelope precoding algorithm for the massive multi-user (MU) multiple-input multiple-output (MIMO) downlink. Specifically, we adapt the squared-infinity norm Douglas-Rachford splitting (SQUID) precoder to systems that use oversampling digital-toanalog converters (DACs) at the base station (BS) and orthogonal frequency-division multiplexing (OFDM) t...

Multi-user Orthogonal Frequency Division Multiplexing (OFDM) currently is of great interest to telecommunication researchers all over the world. Independently, significant research is being done on the OFDM physical layer (PHY), as well as on resource optimization and other medium access control layer (MAC) related issues. The MAC and PHY communities, however, develop their solutions mostly in ...

Reconfigurable intelligent surface (RIS) enables the configuration of propagation environment. Channel estimation is an essential task in realizing RIS-aided communication system. A multi-user multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) system involves cascaded channels with high dimensions and sophisticated statistics. Thus, implementing optimal mini...

Problem statement: MB-OFDM UWB systems have attractive features and received a great attention. It has the capability of sending/receiving data at rates in access of 100 Mbits sec. Owing to the sensitivity of OFDM systems to synchronization errors, a fast synchronization algorithm is required to discern for the start of OFDM symbol. Existing approaches to OFDM time synchronization rely on their...