This paper presents performance of two level turbo coded 4-ary continuous phase frequency shift keying. In this system,, to provide phase continuity of the transmitted signals, turbo encoder and continuous phase encod...
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This paper presents performance of two level turbo coded 4-ary continuous phase frequency shift keying. In this system,, to provide phase continuity of the transmitted signals, turbo encoder and continuous phase encoder (CPE) are serially concatenated at the second level, while first level consist of only a turbo encoder. Simulation results are drawn for proposed system over AWGN, Rician and Rayleigh channels for three iterations while frame sizes are chosen as 100 and 1024. High error performances are obtained for proposed system compared to Trellis Coded CPFSK system
In wireless networks, coded cooperation is a way of realizing uplink transmit diversity at the mobile user with single antenna. In this work, in order to increase the power and bandwidth efficiency, a multilevel coded...
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In wireless networks, coded cooperation is a way of realizing uplink transmit diversity at the mobile user with single antenna. In this work, in order to increase the power and bandwidth efficiency, a multilevel coded cooperative system using orthogonal signalling is proposed. Orthogonal signalling not only enables transmission of both users data in single channel symbol but also provides independent detection at the receiver. We investigate the performance of the system by derivation of pairwise and bit error probabilities together with Monte-Carlo simulations.
In the current optical data storage, binary coding is used, in which mark and null states correspond to high and low levels of reflected light. In the binary coding, the capacity of recording information can be increa...
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In the current optical data storage, binary coding is used, in which mark and null states correspond to high and low levels of reflected light. In the binary coding, the capacity of recording information can be increased by minimizing the pit size and maximizing the track density. However, the minimization of pit size will reach a limit even if near-field optics are used. To overcome this limitation, we have proposed and demonstrated multilevel optical data storage by changing the pit depths of a birefringent film. In this method, the volume of stored information can be increased without increasing the pit density. multilevel pits with the width of 1 mum and with various depths were formed on a liquid crystalline polymer film with the birefringence of 0.20, and the phase difference between orthogonal polarizations was confirmed to be proportional to the depth of the pits.
In this Paper, we proposed a multilevel coding scheme for 64DAPSK Modulated OFDM signals. The performance comparison with single level coding for 64QAM and 64DAPSK is given based on simulations. Simulation proved that...
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ISBN:
(纸本)9781424458509;9781424458493
In this Paper, we proposed a multilevel coding scheme for 64DAPSK Modulated OFDM signals. The performance comparison with single level coding for 64QAM and 64DAPSK is given based on simulations. Simulation proved that it has about 1～1.5 dB gain over different channels.
In order to analytically evaluate the characteristics of the multilevel coding method using finite interleaving for a fading communication channel, an evaluation method for coding performance is proposed. In this meth...
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