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In the space-time cooperative relay orthogonal frequency division multiplexing (OFDM) system, a challenge is the lack of perfect timing synchronization, which degrades the performance of the receiver greatly. This paper investigates a timing synchronization scheme to solve this problem. Unlike the conventional algorithms, our attempt primarily aims to obtain the different time delays of source and...
A novel coding scheme called the distributed generalized low-density (GLD) code is proposed for cooperative relay networks. In this scheme, each relay node decodes and forwards some of the constituent codes of the GLD code to cooperatively form a distributed GLD code using the partial error-detecting and error-correcting capabilities of the GLD code. Distributed GLD codes can easily be adjusted to...
MIMO system has been proven to provide more capacity than conventional SISO system, which is linear increase with the number of minimum transmit and receive antennas. But it is true only in independent conditions, when the spatial fading correlation exists, the capacity may be different. Linear precoder and decoder enable optimal allocation of power and bits over the spatial and temporal domain, depend...
The spatial and temporal correlation is investigated at both transmitter and receiver. A cluster-based double bounce MIMO channel model is presented. The model can be used for nonselective Rice fading MIMO channels, and the expressions for correlation coefficient and channel capacity are derived. The correlation coefficient is the function of antennas spacing, angular spread, power angular spectrum,...
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...
MIMO system has been proven to provide capacity that is linear increase with the number of antennas. But it is true only in independent channels; when the spatial fading correlation exists, the capacity may decrease. The correlation coefficient is the function of antennas spacing, angular spread (AS), power angular spectrum (PAS), and so on. In this paper, the expression for correlation coefficient...
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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