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Two-stage precoding is a promising transmission strategy for multi-user frequency division duplex (FDD) massive multiple-input multiple-output (MIMO) systems due to its large multiplexing gain with overhead reduction in both downlink channel estimation and channel state information (CSI) feedback. The performance of existing two-stage precoding schemes mainly depends on appropriate selection and clustering...
In this article, we propose a PHY-caching scheme for 5G wireless networks to achieve spectral efficiency gain over conventional caching schemes, which do not induce physical layer cooperation. By properly caching some popular contents at the BSs, the proposed PHY-caching can opportunistically transform the topology of the RAN from an unfavorable topology (e.g., relay or interference topology) into...
Recently, physical layer (PHY) caching at the base station (BS) has been proposed to induce MIMO cooperation among peer BSs to reduce interference and improve the spectrum efficiency in the radio access network (RAN). Compared with caching at the core network (CN) gateway (CN-caching), which covers a large number of users, it may appear that PHY-caching covers less users and results in lower cache...
Mobile communications toward the fifth generation (5G) have been popularly discussed and investigated worldwide in academia and industry. 5G, as an evolution from the previous generations, demands both high system capacity and high data rate. A novel multiple access scheme based on millimeter wave transmission and massive antennas at a base station (BS), named multipath division multiple access (MDMA),...
We propose a randomized user-centric remote radio head (RRH) clustering (UCRC) scheme for cloud radio access network (C-RAN) with physical layer (PHY) caching. The randomized UCRC design is modeled as a multi-timescale non-convex problem to optimize the average weighted sum rate (WSR). We first decompose the problem into short-term precoding and medium-term UCRC subproblems. Then we propose a low...
Interference is a key issue that limits the Degrees of Freedom (DoF) in conventional wireless networks. In this paper, we propose a novel physical layer (PHY) caching scheme to achieve DoF gains in interference networks. Specifically, by properly caching a portion of the content files at each transmitters, the PHY topology can be opportunistically transformed from the unfavorable interference channel...
When the arrival timing difference exists in the uplink MUMIMO systems, the conventional MUD techniques, without timing control, failed under this circumstance. In this paper, we proposed a joint distortion precancelation and iterative FDE architecture, without timing control, for the asynchronous system. The proposed method derives the iterative FDE filters, via the MMSE criterion, by treating the...
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