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The deep‐bed drying process of rice grains was investigated through numerical simulation, employing the porous medium flow field theory and the local thermal nonequilibrium method. Moisture field of rice grains described using thin‐layer equations. On this basis, the deep‐bed drying of rice grains modeled with COMSOL, and verified its plausibility. The results showed that the drying rate of rice...
This paper presents two discrete cosine transform (DCT)-based pilot-symbol-aided channel estimation methods using different pilot arrangement schemes. By exploiting the properties of DCT, both proposed methods mitigate the aliasing effect introduced in discrete Fourier transform (DFT)-based channel estimation method when the multi-path fading channels have non-sample-spaced path delays. Of these two...
In this paper, we propose a spatial multiplexing and diversity joint transmit structure for MIMO-OFDM system where space-frequency block coding (SFBC) is used over all spatial multiplexing layers to obtain both space diversity and frequency diversity gain. We have derived a Monte Carlo probabilistic data association (PDA) detector to get a better bit error rate (BER) performance compared to generic...
In this paper, we present an iterative algorithm of channel estimation for MIMO-OFDM systems based on discrete cosine transform (DCT). By exploiting the properties of DCT, the proposed method mitigates the aliasing effect introduced in discrete Fourier transform (DFT)-based channel estimation method. Further more, the proposed algorithm reduces the additive white Gaussian noise (AWGN) and inter-carrier...
Making full of multi-polling technique and the silence characteristic of VoIP service, a new Extended rtPS uplink scheduling algorithm is proposed based on IEEE 802.16e system. Via analysis of theory and simulation, the proposed algorithm has superior performance in view of throughput and capacity at the same time it hsa little influence in the delay requirement of VoIP service.
In this paper, OFDM (uncoded and coded) systems are combined with both vertical layered space-time (VLST) architecture and carrier interferometry (CI) spreading codes, resulting in the so called VLST-CI/OFDM system and VLST-CI/COFDM system. It is shown that the novel systems offer considerable high throughput provided by VLST architecture and simultaneously achieve dramatic performance gains by taking...
As a soft-input soft-output detection scheme for multiple-input multiple-output (MIMO) channels, the stochastic sequential Monte Carlo (SSMC) method generates MlMO symbol samples based on importance sampling and resampling techniques. In this paper, the MIMO system, with the SSMC detection, is incorporated with the orthogonal frequency division multiplex (OFDM) and turbo channel coding to undertake...
Carrier interferometry (CI) may be used to spread OFDM symbols over all N subcarriers to exploit frequency diversity without loss in throughput. In this paper, we implement the OFDM (uncoded and coded) system incorporated with the carrier interferometry and VBLAST (Vertical Bell Laboratories layered Space-Time) to undertake performance comparison in frequency selective fading channel. It is shown...
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