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The 3rd Generation Partnership Project (3GPP) has started to investigate feasibility of machine type communication terminal class in Long Term Evolution (LTE) networks in the Release 12 to address the requirements of the Internet of Tings (IoT) targeting low-end device market with improved coverage. Along with that, the 3GPP has defined reference signals to support device discovery, communication...
In this paper, we study the application of a robust and Reduced-Complexity (RC) synchronization technique to the IEEE 802.11n Wireless Local Area Networks (WLAN). The studied technique exploits a preamble of two identical parts and splits the synchronization processing into two stages: a first auto-correlation based coarse stage and a second differential correlation based fine stage. The coarse synchronization...
In this paper, we propose the use of differential space-time block coding to improve the synchronization for Wireless Local Area Networks (WLAN) without any channel estimation requirement. We study the application of an efficient synchronization technique recently proposed for 2×1 MISO-OFDM systems in the IEEE 802.11n WLAN for 2×1 and 2×2 MIMO configurations. The proposed technique exploits a preamble...
In this paper, we propose a robust timing and frequency synchronization scheme for MIMO-OFDM systems. Exploiting a preamble of two identical parts and proceeding in two stages, the proposed technique achieves synchronization under non- coherent detection. To take advantage from transmit diversity, we use differential Alamouti space time block coding which provides full- spatial diversity without requiring...
In 3GPP Long Term Evolution (LTE) system, cell search must be first performed to allow the connection between the user equipment and the serving cell. In this paper, we investigate sector search, which is a part of the cell identifier, as well as timing synchronization based on the standardized Primary Synchronization Signal (PSS) generated from known Zadoff-Chu sequences. To this aim, an initial...
This paper studies the performance of a recently proposed efficient reduced-complexity time synchronization approach, initially applied to OFDM systems, in the DMT systems. This approach uses a preamble of two identical parts and proceeds in two stages. In the first stage, a Cox and Schmidl-like metric is calculated to provide the coarse estimate. In the second stage, a differential correlation based...
In this paper, downlink primary synchronization for LTE systems is investigated, including time synchronization and sector identification. The proposed scheme exploits the Primary Synchronization Signal which is generated from known Zadoff-Chu sequences. Unlike the conventional schemes, in which time synchronization is first processed then the demodulated OFDM symbols are cross-correlated with the...
This paper presents a performance analysis of a recently proposed preamble-based reduced-complexity (RC) two-stage synchronization technique. The preamble, composed of two identical subsequences, is first used to determine an uncertainty interval based on Cox and Schmidl algorithm. Then, a differential correlation-based metric is carried using a new sequence obtained by element wise multiplication...
A new Genetic Algorithm (GA) based sequence optimization is here proposed. The studied sequence, which we refer to as Encoding Sequence (ES), is used in a recently proposed OFDM preamble-based synchronization technique. The optimal ES is generated offline by differentially correlating the preamble samples to each other respecting a shift. To determine the frame start at the receiver, the ES is correlated...
This paper applies a recently proposed efficient technique that has been conducted regarding timing synchronization in OFDM systems, to the IEEE 802.11a/g standards. The time synchronization is fulfilled using the structure specificity of the short training sequence of IEEE 802.11a/g preamble. Two versions of the applied technique are considered: a singlestage brute force approach, which carries differential...
We here deal with a recently proposed data-aided reduced-complexity approach for OFDM time synchronization. In the considered approach, an encoding sequence generated from the preamble is differentially correlated with the received signal to estimate the frame start. In this paper, we study the off-line design of the encoding sequence. We present two efficient algorithms for deriving QPSK encoding...
In this paper, we analytically study the performance of a recently proposed efficient reduced complexity time synchronization approach for orthogonal frequency division multiplexing systems. This method uses a preamble of two identical parts and proceeds in two stages. In the first stage, the repetitive structure of the preamble is exploited to provide the coarse time estimate respecting the algorithm...
In this paper we propose a reduced-complexity two-stage time and frequency synchronization approach for OFDM systems, operating in multipath channels. The proposed approach exploits a single-symbol preamble with a repetitive structure, composed of two identical m-sequences. The first coarse stage, based on a sliding correlation, finds out the reduced uncertainty interval over which the second fine...
This paper presents a performance analysis of a recently proposed preamble based reduced complexity two-stage synchronization technique. The preamble, composed of two identical sub-sequences, is first used to determine an uncertainty interval based on Cox and Schmidl algorithm. Then, a differential correlation is carried using a new sub-sequence obtained by element wise multiplication of the preamble...
In this paper, we propose a new scheme for data- aided time and frequency synchronization for OFDM systems, based on a single-symbol preamble. The preamble, of useful length $2^{m}-2$, is composed of two consecutive identical m-sequences (with length each). This preamble is extended by a cyclic prefix of convenient length. This stucture is adequate for a two-stage synchronization scheme,...
In this paper an efficient scheme for OFDM data-aided synchronization is presented. It is based on a new single-symbol preamble structure. The preamble symbol comprises two successive equal-duration sub-symbols, the second one of which is a differentially encoded version of the first one, using an adequately designed precoding sequence. We here explore the performance of the method in the case of...
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