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This paper presents the implementation of frame detection algorithm based on the autocorrelation properties of Barker sequences in a digital communication system using software-defined radios (SDRs) such as the Universal Software Radio Peripheral (USRP) and PXI developed by Ettus Research and National Instruments. The measured and simulated results are compared. The communication system is implemented...
In a prior work, we derived the LLRTD metric for frame synchronization over a binary symmetric channel (BSC), where data frames are of unknown and unequal lengths and with synchronization words aperiodically inserted, data symbols have a known, unequal distribution. The performance of the metric was evaluated using simulations. Here we provide an analytical performance evaluation for the LLRTD metric...
In this paper, the problems involving frame synchronization and convolutional code identification for CCSDS link protocol are tackled. By combining the correlation of convolutional codeword and the theory of association rule mining, a new joint frame synchronization and code identification method is presented. It uses sequence position association to identify periodic frequent sequences and then match...
This paper proposes a novel approach for frame synchronization which applies Maximum Likelihood Ratio Testing (MLRT) coupled to Post Detection Integration (PDI) scheme. This approach is robust to frequency and phase offsets, meanwhile it considers base band signal over sampling without matched filtering and perfect timing. Derivation and realization diagram of this approach is presented. Numerical...
In this paper, the acquisition performances of different detectors are investigated and evaluated for frame acquisition in DVB-S2 system. Mean acquisition time in both single-dwell and multi-dwell procedures are derived based on a Markov chain model. Since it is quite complicated to analyze some parameters in close formula, a semi-analytical method is adopted to simplify the analysis. Performance...
This paper presents synchronization and frequency offset estimation of IEEE 802.16e downlink implementation using preamble on digital signal processor. We considered time division duplex mode, physical layer base band processing, to detect the preamble and further calculate the symbol timing, frequency/phase offset and frame synchronization of the received signal. Consequent information of cell identification...
In the WIMAX (802.16e) standard several small medium access control (MAC) packets may be aggregated to form a MAC burst, forwarded to the physical (PHY) layer The burst transmission is a mechanism to allow multiple MAC protocol data units (PDUs) belonging to the same video channel to be transmitted / received in an aggregated way, in order to enable power saving at the mobile station, by putting the...
This paper deals with the problem of joint frame synchronization and phase ambiguity resolution for high data rate MPSK systems. We presents a novel method of utilizing a simplified correlation operation which can reduce the computational complexity and use two thresholds to detect the frame starting point and the value of phase ambiguity simultaneously. The parallel architecture of frame synchronizer...
In this paper, we propose a frame synchronization method for underwater acoustic communication on mobile platform. This new method involves transmitting signal based on hyperbolic frequency modulated (HFM) signal as a preamble of the frame, while the receiver uses a correlator which is matched to the transmitted signal. This method can provide us with good signal detection ability which is very important...
In communication systems which transmit a continuous stream of data, the coded data symbols are typically transmitted in frames. Frames contain one or multiple blocks of coded data. The Start Of a Frame (SOF) is especially required to synchronize the decoder, especially in systems which use modern codes such as Turbo codes. This process is known as frame synchronization. We examine the general problem...
This paper studies the frame synchronization of Orthogonal Frequency Division Multiple Access-Time Division Duplexing (OFDMA-TDD) systems and proposes a new method for downlink of IEEE 802.16 to improve frame synchronization performance. In this paper, we adapt three existing timing metrics for frame synchronization in OFDM mode of WiMAX. Among the methods considered, it is shown that direct application...
In this paper, we present a new iterative algorithm for designing binary sequences with good properties in terms of aperiodic autocorrelation function. The algorithm has a low complexity, growing linearly with the sequence length, and allows improvements with respect to best known sequences, especially for large lengths. First, we show its application to the design of long markers for frame synchronization...
In this paper, we present and analyze efficient frame synchronization and frequency offset compensation scheme with ternary sequences for an orthogonal frequency division multiplexing (OFDM) system in Rayleigh fading channels. Frame synchronization is an essential procedure for normal operation of the OFDM system because of sensitivity to synchronization errors. And when there are frequency offsets...
The problem of frame synchronization with equiprobable data symbols is widely analyzed in the literature and the optimum metric for AWGN channels has been derived both in the case of periodically and aperiodically embedded data symbols. On the contrary, the case of non-equiprobable data symbols has not been studied, although it can occur in many practical situations. An optimum metric for frame synchronization...
The problem of frame synchronization is formulated and investigated for multiple access channels (MAC). Several decision rules for locating the starting positions in continuously transmitted frames are proposed and compared, for both user- synchronous and user-asynchronous cases. It is shown that the common decision rule based on the correlation statistic is suboptimal, and that correction terms need...
This paper studies an algorithm on frame and symbol timing synchronization in burst OFDM communication based on IEEE802.11a, and analyzes the effect of symbol timing synchronization error. Itpsilas not perfect in many algorithms on timing synchronization at present, such as high complexity, floated threshold along with the signal energy. Therefore, it's necessary to propose an algorithm on symbol...
Synchronization at receiver, including mode detection, frame synchronization, sampling time recovery (STR) and carrier frequency synchronization four parts, is crucial for digital communication systems. Time domain synchronous (TDS) block transmission system, in which pseudo noise (PN) sequences are padded between two adjacent data blocks as guard intervals (GI), is widely used in wireless communication...
In this paper, we adapt four existing timing metrics for frame synchronization in OFDMA mode of WMAN. Among the methods considered, first method uses cyclic prefix information present in the symbol, second method uses the symmetry in the time domain preamble data, third method exploits a priori knowledge of the preamble PN sequence, and the fourth method exploits the conjugate symmetry in the time...
In this paper, we propose a method to reduce operational complexity of the conventional maximum-likelihood based double correlation algorithm for frame synchronization. The proposed method is based on frequency-domain processing by fast Fourier transform and a corresponding observation length for full-size shift of training sequence. Simulation result shows that the proposed algorithm can achieve...
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