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Sparse code multiple access (SCMA) is a novel non- orthogonal access technique for future multiple access, which increases the spectral efficiency by directly mapping data streams of multiple users to sparse codewords in different SCMA layers, and these SCMA layers are imposed on the same SCMA block composed of limited resource elements (REs). As the sparsity of codewords, message passing algorithm...
As one of the candidate wireless access techniques of 5G system, non-orthogonal multiple access (NOMA) is a power domain non-orthogonal multiple-access technique, which can greatly enhance spectral efficiency and system capacity. This paper mainly focus on user pairing and access theme of NOMA system, and respectively presents channel state sorting pairing algorithm (CSS-PA) as user pairing (UP) theme...
This paper considers a wireless-energy-transfer (WET)-enabled massive multiple-input-multiple-output (MIMO) system based on superimposed pilot (SP). With the aid of SP, the uplink (UL) channel estimation and wireless information transmission (WIT) that powered by the downlink (DL) WET can be operated simultaneously, and thus provide the potential for improving the UL achievable rate. The impact that...
Spectrum sensing is one of the most challenging tasks in cognitive radio. Unfortunately traditional schemes fail to balance between accuracy and complexity, which are the key indicators for the performance of spectrum sensing. In this paper, a new spectrum sensing scheme based on phase difference is proposed. Through analyzing the distributions of phase difference between adjacent samples of noise...
This paper deals with the problem of channel estimation for multiple-input multiple-output/orthogonal frequency-division multiplexing (MIMO/OFDM) systems based on superimposed training (ST). Channel coefficients are firstly estimated by judicious designing superimposed pilot sequences across different users. Then, we analyze the channel estimation performance and derive a closed-form expression for...
Cognitive radio is a promising technology, which can alleviate the problem of crowded bandwidth resource with low spectral efficiency. In this paper, we present a cross-layer approach for joint link scheduling and power control in cognitive radio networks, in order to make more efficient use of system resources. The principle behind this algorithm is to find a transmission scenario in which the network...
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