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We consider the mapping of bits-to-superimposed constellation symbols in terms of the achievable rate on the channel for the HARQ system using superposition coding as proposed in [2]. We show that using a Gray mapping of bits-to-superimposed constellation symbols has better performance than the conventional natural mapping that results from superposition in signal space, for all the values of the...
In this paper, we propose a novel rateless coding scheme for dynamic decode-and-forward (DDF) relaying in wireless relay networks. The proposed rateless code is developed to overcome the high error floor problem caused by the Luby Transform (LT) code-based encoding scheme in Raptor codes. The improvement is achieved by providing each symbol with approximately equal protection in the belief propagation...
In the wireless network, cooperative diversity has proved itself an effective technology to enhance the performance of system. For the two-user cooperative communication system model, this paper gives a detailed analysis on three kinds of conditional cooperative diversity schemes which include the amplification and forward, decode and forward and coded cooperation; It also shows the simulation model...
A new system of transmission and reception with security and reliability requests for the networks of fourth generation (4G) is proposed. The security is provided by elliptical curve encryption, system reliability is given by the encoding of irregular low density parity check code (LDPC) and the interleaver. The construction of the irregular LDPC used a technique of low level error, the decoding utilized...
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