Abstract In this letter, we propose a two‐color reuse scheme in the forward link of multi‐beam high throughput satellite systems, where dual‐polarization is utilized to provide an additional dimension isolate severe inter‐beam interference. This optimized through formulating nonconvex optimization problem with respect precoding design maximize system sum rate, taking into account intense interference among beams using same polarization. Then path‐following algorithm proposed for its...

The application of non-orthogonal multiple access (NOMA) in millimeter wave (mmWave) massive multiple-input multiple-output (MIMO) systems can enhance spectral efficiency. In this paper, we propose an angle-domain NOMA scheme over the multi-cell mmWave MIMO networks. This is optimized through both user scheduling and precoders/decoders design to maximize system sum rate, where precoders are decomposed into outer inner ones. We construct with help users' spatial angle information, i.e., beam...

In this letter, we formulate an off-grid channel model to characterize spatial sample mismatching in the discrete Fourier transform (DFT) based massive multiple-input-multiple-output (MIMO) estimation over millimeter-wave (mmWave) band. Then, decompose mmWave MIMO into learning of parameters and virtual estimation. Specifically, expectation maximization (EM) sparse Bayesian framework is first developed learn parameters, such as bias signatures, with unknown noise. With learned resort linear...

Non-orthogonal multiple access (NOMA) can dramatically improves the spectral efficiency, while cell-edge user's performance will be fiercely degraded due to inter-cell interference in multi-cell NOMA networks. In this letter, we invoke alignment (IA) resist loss of users and propose a cooperative transmission scheme for Then, formulate an optimization problem terms joint power allocation seek optimal scheme. To solve challenging nonconvex problem, tight lower bound function logarithmic...

As an appealing interference management approach, alignment (IA) has not been intensively studied in full-duplex (FD)-based multi-cells. In this letter, based on Bezout's theorem, we explore the feasibility conditions of IA small cell networks, where base stations are equipped with FD hardware. The comparison performance between and traditional half-duplex cells terms total degrees freedom (DoFs) is also conducted. We find that limited by number antennas at users. Furthermore, verify...

In this paper, we propose an uplink angle-delay-Doppler domain non-orthogonal multiple access (NOMA) scheme over massive multiple-input multiple-output orthogonal time frequency space (MIMO-OTFS) networks, which is inspired to address the situation that user connectivity dramatically restricted if users have overlapped angle signature with limited delay-Doppler resources. To be specific, aid of NOMA along transmission, schedule employ same Correspondingly, a clustering algorithm and optimal...

In this paper, we propose an angle domain sparse code multiple access (ASCMA) scheme for the massive multiple-input multiple-output (MIMO) networks to enhance connectivity. The basic idea of ASCMA is construct a non-orthogonal transmission policy in channel MIMO networks. Firstly, mapping structure presented, where both power and domains are taken into consideration. Then, obtain optimal factor graph strategy through maximizing sum rate all users contained by one cluster. Besides, discuss...

In this paper, we investigate a spatially sparse code multiplexing (SCM) transmission scheme for the massive multiple-input multiple-output (MIMO) networks to enhance access connectivity. We construct non- orthogonal policy over both power and angle domains fully utilize limited angle-domain degree of freedom (DoF). Firstly, mapping structure in domain detection method are presented. Then, formulate an optimization problem seek optimal proposed SCM framework, where design matrix allocation...

In this paper, we propose an angle-domain NOMA transmission scheme over multicell massive MIMO systems, where multiple users' signal can be superposed to served by the same spatially beams. Then, carefully consider performance degradation resulting from severe inter-cell interference, and formulate optimization problem in terms of jointly optimizing precoders decoders (JOPD) seek optimal policy with quality service (QoS) requirements both cell-edge users cell-center users, which consequently...