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Articles by X. Zhou
Total Records ( 3 ) for X. Zhou
  X. Zhou , D. Wang , D. Hu and Q. Lin
  In this study, we consider the design of a radio resource allocation technique for an Orthogonal Frequency Division Multiple Access (OFDMA) based Multiple Input Multiple Output (MIMO) multihop network. To avoid the inter-hop interference, the half-duplex orthogonal relay channel construction method and related multihop transmission scheme are designed. Over Nakagami-m fading channels, we propose a low-complexity resource allocation algorithm using Meijer G-function. And, the long term fairness performance is also investigated. Simulation shows that the proposed analytical algorithm is efficient and with good accuracy to Monte Carlo results. And, simulations also demonstrate that the spatial diversity gain offered by relay antenna array can effectively balance the tradeoff between the fairness performance and the system throughput.
  X. Zhou , Y. Yang , H. Shan and Z. Wang
  In this study, we consider the design of a network coded non-orthogonal interleave-division multiple-access (IDMA) user cooperation system. Based on eXclusive OR (XOR) operation at relays, the source messages are re-transmitted forward to the destination simultaneously. At destination, a network coding aided iterative Multi-User Detection (MUD) scheme is proposed. And, a multi-user soft network decoding algorithm is developed. Over Nakagami-m fading channels, we examine the BER performance of the proposed network coded cooperative (NetCC) IDMA scheme in various scenarios. Simulation results confirm that NetCC IDMA scheme can provide significant BER improvement compared to the existing IDMA scheme. In addition, based on the EXtrinsic Information Transfer (EXIT) chart technique, the convergence behavior of NetCC IDMA scheme is studied. Simulations also reveal that the proposed scheme can support more users than existing IDMA scheme.
  The primary objective of this study was to investigate the impact of observation scale on the estimation of soil thermal properties. Transients are usually filtered out and ignored when classical Fourier approaches are used to deconstruct and model temperature time series. It was hypothesized that examination of such transients may be more important in identifying and quantifying short-term perturbations in internal soil heat transfer induced by agronomic disturbances. Data-logged temperatures were collected at 10-minute intervals from thermistor probes installed at 10 and 25 cm depths in isolated areas of two grassed plots. One plot (6T) had been treated twice with 6 Mg ha−1 composted turkey litter as received. The other plot (NPK) was fertilized at the same time with NPK fertilizer. Various methods were used to analyze the series to obtain apparent soil thermal diffusivity (D-value) at various time scales. Results supported the hypothesis that short-term differences in internal soil heat transfer between the 6T and NPK plots were more manifest and effectively captured by estimated D-values calculated from the monthly and daily partial series. The 6T plot had higher soil organic matter content than the NPK plot and had lower apparent soil thermal diffusivity. Diurnal soil temperature amplitudes, required to calculate the mean D-values from partial series, were more effectively obtained using a temperature change rate method. The more commonly used Fourier analysis tended to be effective for this purpose when the partial series reasonably presented well-defined diurnal patterns of increasing and decreasing temperatures.
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