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As the next generation mobile ad hoc network (MANET) evolves to allow for multiple simultaneous transmissions within one-hop for higher spectral efficiency, the interferences from the peer nodes will pose a challenge to the initial acquisition in the MANET. In this paper, we propose a maximum likelihood (ML) method of initial acquisition of the preamble sequences. Simulations show that this proposed...
In this paper, a pilot-aided frequency synchronization scheme for orthogonal frequency division multiplexing (OFDM) systems is proposed. A maximum likelihood (ML) estimator based on Double Dwell Synchronization (DDS) is employed for offset estimation and correction. The proposed DDS scheme provides an accurate estimate over a wide estimation range with reduced computational complexity for both AWGN...
In this paper, hardware design for a blind fine carrier frequency offset (CFO) estimation method is proposed for MB-OFDM UWB system. The method utilizes the conjugate symmetry in frequency domain of the physical layer convergence protocol (PLCP) preamble sequence to achieve high accuracy and low complexity fine CFO estimation with wider range of CFO error. Previous contribution to CFO estimation has...
The OFDM system was proposed to efficiently eliminate the multipath fading effects and impulse noise over the wireless channel. However, performance of the OFDM system is very sensitive to the synchronization errors at the receiver. The system performance is degraded dramatically by the carrier frequency and sampling clock offset. Therefore, the receiver systems require a fine synchronization system...
A new training symbol with special structure is proposed aimed at the synchronization problem of orthogonal frequency division multiplexing (OFDM). Being different from many classical algorithm, the training symbol has special phase rotation relationship in the frequency domain. Based on this structure, a new joint symbol timing and frequency synchronization algorithm is presented. In the New algorithm,...
In relating the use of consumer-grade equipment, Carrier Synchronization is a difficult task for DVB-S2 receivers, which have to operate with a large initial Carrier Frequency Offset (CFO) yet needing to achieve relatively high estimation precisions. For these reasons, conventional Carrier Frequency Recovery schemes for DVB-S2 systems need significant hardware complexity. In contrast, this paper proposes...
The paper introduces a turbo (iterative) receiver design for joint channel estimation, synchronization and soft decoding in convolutional-coded multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems over time- and frequency-selective (doubly selective) channels. Employing the complex-exponential basis expansion model (CE-BEM) for representing doubly selective...
Multiple antenna systems have been shown to provide significant performance improvements for network nodes; however, the vast majority of nodes in military networks will be limited to single channel devices due to mobility (size and power) and ease of use considerations. In this paper we apply a new joint synchronization-pilot sequence (JSPS) optimization design technique to multiple transmitter OFDM...
To ensure reliable acquisition of data in DVB-RCS systems, it is necessary to use a carrier frequency offset estimator having a large estimation range. This paper proposes an efficient data-aided feed-forward carrier frequency estimation algorithm for DVB-RCS systems. In this paper, the performances of the DA CFO estimation algorithms are compared and an efficient CFO estimation algorithm which is...
In this paper, a hybrid synchronization technique applied to burst-mode communication is proposed. A synchronization technique is to estimate carrier frequency and phase offsets in a noisy channel environment. A fundamental problem for estimating the parameters (carrier phase and frequency offsets) in burst-mode transmission is that the ways of pursuing estimation accuracy and transmission efficiency...
This paper presents an IEEE 802.15.4 (ZigBee) practicable baseband processor including transmitter and receiver. To estimate and compensate carrier phase error at baseband, the receiver allows full digital solution for carrier phase synchronization. An existing packet detection algorithm for spread spectrum communication system is used to estimate large carrier frequency offset. This paper also presents...
In this paper, we address the estimation of carrier frequency offset (CFO) in orthogonal frequency division multiplexing (OFDM) based multiple input multiple output (MIMO) communication systems. One of the novelties of the proposed approach is the judicious combination of two methods so as to reduce the bandwidth overhead and computational complexity without compromising the CFO estimation range....
In this paper, a bandwidth efficient synchronization scheme for joint timing and frequency estimation is investigated for orthogonal frequency division multiplexing (OFDM) systems. The investigated architecture super-imposes a transparent generalized chirp-like (GCL) sequence [1] onto the frequency domain data symbols. In contrast to the existing synchronization schemes, the super-imposed architecture...
This paper presents an efficient feedback synchronization technique for joint estimation of integer and fractional carrier frequency offsets in orthogonal frequency division multiplexing (OFDM) systems. The proposed technique has high accuracy, broad estimation range, and works effectively over frequency-selective radio channels. A dynamic self-noise reduction technique is introduced to enhance the...
Synchronization of the carrier frequency offset (CFO) is a crucial issue in the implementation of orthogonal frequency division multiplexing (OFDM) systems. Several estimation techniques for frequency offset have been proposed in the literature but varied test conditions make comparison difficult. This paper compares different synchronization algorithms for the wireless communication standard IEEE...
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