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AS an important technological link of LED production, LED packaging directly decides the reliability and qualified rates of LED. However, the LED packaging failure was a common problem in LED life cycle. LED packaging pollution, which as one of many LED packaging failure reasons, was always of the focus of research. In this paper, through analyzed LED failure cases of packaging pollution, the general...
Along with the development of high-speed railway, higher and higher technical requirements for the mobile communication system in it are raised. Communication Based Train Control (CBTC) will be based on mobile communication, of which the key problem is how to support high reliability of data transmission in order to improve utilization of tracks and enhance train's safety. The applications of LDPC...
Reliability-based hybrid ARQ (RB-HARQ) is a recently developed form of incremental-redundancy ARQ. In RB-HARQ, the bits that are to be retransmitted are adaptively selected at the receiver based on the estimated bit reliabilities. This technique has the potential to improve performance and minimize retransmission size by targeting those bits that are likely to be in error. However, previous versions...
In this paper we focus on efficient retransmission strategy for MBMS that employs hierarchical modulation. Hierarchical modulation offers a mechanism to enable the transmission of several data streams on one single frequency channel, with different transmission qualities, which requires more efficient HARQ strategy for MBMS. Constellation rearrangement and symbol bits rearrangement based HARQ are...
A novel IP quality evaluation method is proposed in this paper. Based on the analysis of the characteristics of several current mainstream IP quality evaluation metrics, advantages and deficiencies of them are summarized. The comparison indicates that due to coarse grain of classification and focusing more on common features, the definition methods of these metrics are lack of individual characteristics...
Link adaptation, scheduling, and hybrid automatic repeat request (HARQ) are indispensable technology for wireless networks to provide high speed packet data services. While prior scheduling algorithms based on the instantaneous data rate to determine the user to be served in each scheduling interval are useful, they do not fully take into account transmission errors and the impact of retransmission...
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