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In short burst communication system, a joint rotational periodogram averaging (RPA) and demodulation soft information carrier estimation algorithm is proposed in this paper. Firstly, the coarse carrier estimation is carried out with periodogram averaging method after that the pilot sequence is rotated with different frequency offsets. Then, further fine carrier estimation is done by stepwise searching...
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...
This paper proposes a new blind algorithm for joint carrier offset estimation and data detection, which is based on particle filtering and recursively estimates the joint posterior probability density function of the unknown transmitted data and the unknown carrier offset. We develop new guidelines for resampling of the particles to take into account carrier offset estimation ambiguity at the edges...
This paper proposes a new blind algorithm for joint carrier offset estimation and data detection, which is based on particle filtering and recursively estimates the joint posterior probability density function of the unknown transmitted data and the unknown carrier offset. We develop new guidelines for resampling of the particles to take into account carrier offset estimation ambiguity at the edges...
A joint synchronization scheme is proposed for burst communications in this paper. By inserting unique words at the beginning of each burst frame, the estimation of timing and frequency offset can be achieved while detecting the burst signal. The derivation and realization of this scheme is presented, the performance is also discussed. It is shown through simulation that the proposed scheme is efficient...
In this paper, a complete solution to the initial synchronization for multi-cell OFDMA (orthogonal frequency division multiple access) systems is proposed. The proposed method consists of the following operations: timing synchronization, fractional carrier frequency offset (CFO) estimation, fractional CFO compensation, and joint integer CFO and preamble index estimation. To estimate multiple fractional...
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...
Orthogonal frequency division multiplexing (OFDM) systems are sensitive to time and frequency offset errors. In this paper, a method of joint timing and frequency synchronization for OFDM systems has been proposed based on preamble structure defined in IEEE 802.16 standard. The proposed method in coarse frame detection has good robustness and anti-noise ability. The coarse and fine frequency offset...
The true Cramer-Rao bound (CRB) for the variance of unbiased, data-aided symbol-timing estimate has been obtained from linearly modulated waveforms through an additive white Gaussian noise channel with random carrier phase already. However, in practice, it is unusual to perform carrier synchronization prior to timing recovery. In this paper, we deduce the true CRB for data-aided time delay and frequency...
In this paper, we proposed a carrier frequency synchronization algorithm joint channel estimation for OFDM using block-type pilot. Each pilot symbol was composed of repeated short PN-sequences. By using this kind of pilot, the estimation of the carrier frequency offset (CFO) was performed into two steps, an acquisition step and a tracking step. During the acquisition step, the estimation range and...
This work presents a new technique for blind and joint estimation of symbol timing and carrier frequency offset in wireless orthogonal frequency division multiplexing (OFDM) systems. The joint estimation is achieved by sensing the interference introduced at the fast Fourier transform (FFT) output when a carrier frequency or timing offsets exist. The synchronization parameters are selected such that...
In this paper, we present a joint algorithm to estimate the fine symbol timing and carrier frequency offsets of wireless orthogonal frequency division multiplexing (OFDM) signals. To jointly estimate synchronization parameters using the maximum likelihood (ML) criterion, we propose to transmit a special pilot symbol. By using a periodic training sequence, we convert the problem of obtaining the ML...
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