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This paper presents low-density parity-check (LDPC) code for image transmission system with any desired code lengths. Parity position of sub-block encoder is easily constructed over Rayleigh fading channel. The code is used as forward error correction (FEC) technique to protect transmitted source data over the channel. The sub-block encoder is designed with OFDM modulation at various noises for two...
The development of DSRC (Dedicate Short Range Communication) for ITS (Intelligence Transportation System) has been recently concerned for high speed data transmission. However, the existing DSRC technique provides a low speed data transmission. The searching for new techniques to support transmission requirement is still on focus. This paper introduces to apply MIMO (Multiple-Input Multiple-Output)...
In this paper, a new Doppler frequency spread estimation method based on the autocorrelation function of the estimated channel impulse response is proposed for OFDM systems in the time-varying channel. We propose a technique to separate the Doppler frequency spread in both slow and fast modes that correspond to vehicle speed. The feature of proposed method is to achieve the accurate Doppler frequency...
We consider a transmit beamforming for an OFDM channel with multiple transmit antennas and single receive antenna. With channel information, a receiver selects and quantizes transmit beamforming vector for each subcarrier. The quantized beamformers are then relayed to the transmitter via a rate-limited feedback channel. We propose to reduce the required number of feedback bits by applying a common...
In this paper, a frequency domain fractionally-spaced conjugate gradient minimum output energy (FDFS-CG-MOE) algorithm is proposed as a new detection technique for MC-CDMA systems. The proposed technique exploits the oversampled received signals in the frequency domain before detection with the CG-MOE algorithm. Simulation results show that the proposed technique has better performance to cope with...
In this paper, the modified widely-linear (WL) frequency-domain equalisation based on the normalised version of orthogonal gradient adaptive (NOGA) algorithm is proposed for orthogonal frequency division multiplexing (OFDM) systems. We introduce the extension of NOGA algorithm to widely linear complex-valued approach investigated with mixed-subcarrier cost function. The proposed algorithm can be easily...
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