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This paper addresses the problem of carrier frequency synchronization and time-varying channel equalization in the uplink of a broadband multi-user wireless communication system employing an oversampled perfect reconstruction filter bank (OPRFB) transceiver structure for multi-carrier modulation. Based on the maximum likelihood (ML) principle, a pilot-aided joint estimator of the carrier frequency...
Recent advances in microwave technology and signal processing have unveiled the potential of the so-called wireless power transfer (WPT) from one device to the other. This has resulted in reducing the need of a local power source at the wireless devices. In this paper, we target a popular physical layer technology, namely the orthogonal frequency division multiplexing (OFDM) and propose a novel approach...
Coordinated Multipoint (CoMP) transmission is a promising technology in 4G Long Term Evolution (LTE) systems to enable coverage and high data rates for cell edge User Equipments (UEs). However, the presence of Timing Offset (TO) between the received signals from multiple transmitters at the UE could prove prohibitive for CoMP transmission. Such TO affects the estimation of the transmit covariance...
For two-way relaying assisted by analog network coding, most investigation so far is based on perfect synchronization assumption. In contrast, in this paper we consider the more practical asynchronism assumption, and develop a new OFDM transmission scheme that is robust to the lack of synchronization in both timing and carrier frequency. In our scheme, the relays' signals are constructed by fusing...
For an LTE user equipment to be able to connect to a cell, cell search must first be performed to obtain the cell identity and timing required to connect to the cell. In this paper, a complete solution is proposed for the detection of the Primary Synchronization Signal that carries the sector identity, which is part of the cell identity. A novel adaptive technique that adapts its parameters according...
Distributed transmission involving multiple uncoordinated transmitters has become a popular subject in wireless communications, such as cooperative transmissions, relaying, distributed MIMO, network coding, multi-access and multiuser detection. One of the major challenges for implementing distributed transmissions is the difficulty of synchronizing carrier frequency and timing of the distributed transmitters...
Cooperative Multiple Point (CoMP) transmission aided Distributed Antenna Systems (DAS) are proposed for increasing the received Signal-to-Interference-plus-Noise-Ratio (SINR) in the cell-edge area of a cellular system employing Fractional Frequency Reuse (FFR) in the presence of realistic imperfect Channel State Information (CSI) as well as synchronisation errors between the transmitters and the receivers...
In this paper, we study the estimation of multiple carrier frequency offsets (CFOs) in a uplink orthogonal frequency division multiple access (OFDMA) system using training sequences. The proposed method can estimate the CFO values of all users in one OFDM block without knowing the channel responses. Unlike most earlier results, the proposed method does not involve any nonlinear search and thus has...
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