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This paper researches channel coding for satellite communications. Fountain codes and Non-binary LDPC codes are introduced, including their encoding and decoding algorithm. Taking advantage of similar characteristic of sparse graph codes, concatenation of fountain codes and Non-binary LDPC codes is proposed. Simulation result shows good performance of the concatenated codes. This work gives us some...
The sphere decoding (SD) algorithm is widely considered to be an efficient approach to obtain maximum likelihood (ML) performance in MIMO detection. At present, almost all of the research about the SD algorithm is based on the assumption of independent and identically distributed channel coefficients. However, the channel coefficients are often correlated in practice, which cause the complexity of...
Low Earth orbit (LEO) satellite networks will work as an important component of the future telecommunications system. Multi-spot-beam antennas on satellites will allow a cellular coverage all over the Earth. However, the high speed of a mobile satellite may give rise to a large number of inter-beam and inter-satellite handovers during a call lifetime. In this paper, the author proposed a threshold-based...
Directional beams can increase the spatial reuse of ad hoc networks, also the limited beamwidth decreases the mutual interference among transmitting signals, so, the performance and the anti-jamming ability are improved greatly. This paper analyzed the existent interferences in ad hoc networks, indicated corresponding methods, and proposed a scheme of using directional antennas. Supported by group...
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