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This paper is on the bit error probability (BEP) of opportunistic decode-and-forward (DF) relaying with coded cooperation, where cooperation diversity is achieved through both channel coding method and spatial diversity of relay selection. Codewords are partitioned into two parts which are source's data and parity, these are transmitted from source's antenna or selected relay's antenna. In this scheme,...
Relaying technique has been developed considerable attention in response to improve reliability and to extend wireless network coverage. One of conventional relaying technique, incremental relaying which uses limited feedback from the destination has attracted research attention because of performance and minimization of relay usage. Moreover, optimal power allocation for various relaying schemes...
In this paper, an efficient Decode-and-Forward (DF) relay selection scheme for interference-limited relaying networks is considered. In contrast to previously reported works, we consider multiple interferences which make the conventional relay selection schemes not suitable for interference-limited networks and propose a new relay selection scheme for DF protocol with multiple interferences. Approximate...
In fast moving environment, the inter-carrier interference (ICI) due to Doppler spread will degrade the performance of OFDM system severely. Using Jakes' model for the Doppler power spectrum and linear model for time-varying channel during an OFDM symbol interval, the analytical closed- form expression of ICI power, signal-to-interference ratio (SIR) and signal-to-interference-plus-noise ratio (SINR)...
Multiple-input-multiple-output (MIMO) technology can efficiently increase the system capacity in rich scattering environments without increasing the bandwidth or transmission power. The precoder for MIMO transmission is a processing technique that exploits the channel state information (CSI) by operating on the signal before transmission to effectively improve link performance. A hybrid automatic...
As physical layer impairments play a large role in determining the ultimate performance of all-optical networks, it has attracted much attention. However, traditional survivability schemes have been designed and utilized without considering the quality of transmission at the physical layer. Recently, a few studies on QoT-aware (quality of transmission) protection were initiated to meet the reliability...
In this paper, we study channel estimation methods with various curve fitting techniques for mobile WiMAX system and find that they cannot support high mobility sufficiently. We also propose a channel estimation method which is based on piecewise linear estimation to overcome the problem of high mobility. The performances including mean squared error (MSE) and bit error rate (BER) are compared and...
WiBro (wireless broadband), the standard of high-speed portable internet (HPI) based on OFDMA/TDD and IP network in Korea, is the subset of consolidated version of IEEE 802.16e wireless MAN standard. In this paper, the architecture and key physical layer technologies of WiBro are briefly introduced, whereas the convolutional turbo code (CTC) with high-order modulation is presented in detail. The performance...
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