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We study the uplink multi-user multiple-input multiple-output (UL MU-MIMO) channel in a wireless local area network (WLAN) with multiple access points (APs) and multiple stations (STAs). APs are allocated with different orthogonal frequency-division multiplexing (OFDM) subcarriers. Each AP has multiple antennas and applies zero-forcing successive interference cancellation (ZF-SIC) as in [1] for spatial...
This paper presents MIMO/CON, a PHY/MAC cross-layer design for multiuser MIMO wireless networks that delivers throughput scalable to many users. MIMO/CON supports concurrent channel access from uncoordinated and loosely synchronized users. This new capability allows a multi-antenna MIMO access point (AP) to fully realize its MIMO capacity gain. MIMO/CON draws insight from compressive sensing to carry...
In this paper, we propose a new interference alignment scheme with limited feedback for the two-cell interfering multi-user multiple-input multiple-output multiple access channel (MIMO-MAC), which provides better performance compared with other schemes when the number of feedback bits is same. Then, we analyse the rate loss for the quantization error, and show that the rate loss is only impacted by...
In this paper, we propose a new method to transmit one more information bit by using orthogonal Space-Time Block Codes (STBC) for 4 antennas. Using two different STBCs matrices transmit one additional bit to achieve high rate-9/8. To maintain full rank and full diversity for the coding gain matrix, a new STBC code with full rate and full diversity is proposed in this letter. In order to implement...
There has been a lot of recent interest in the potential of inter-base station cooperation techniques to manage excessive out-of-cell interference in evolving cellular networks. In this paper, we propose and describe a signal processing approach based on a novel Network Interference Cancellation Engine (NICE), which opportunistically cancels dominant out-of-cell interference by exchanging decoded...
This paper investigates the uplink throughput of network MIMO cellular systems at low signal-to-noise ratio (SNR). The network is modeled according to Wyner's extended cellular model, with intracell orthogonal medium access control. We derive analytical expressions for the two key low SNR parameters; namely, the minimum required Eb/N0 for reliable communications and the wideband slope, assuming noncooperative...
Base station cooperation is a promising solution to the interference limitation of today's cellular networks. The capacity and fairness gains shown by information theoretical analysis of base station cooperation in cellular networks are huge. However, a major downside is the information exchange among base stations, which is the motivation for recent work on backhaul efficient cooperation schemes...
User scheduling and multiuser multi-antenna (MU-MIMO) transmission are at the core of high-rate data-oriented downlink schemes foreseen in the next-generation cellular systems (e.g., LTE-Advanced). Scheduling exploits the knowledge of the users' instantaneous achievable coding rates. However, when it is applied independently in each cell, the level of inter-cell interference (ICI) experienced by each...
MIMO wireless technology is required to increase the data rates for a broad range of applications, including low cost mobile devices. In this paper we present a very low area reconfigurable MIMO detector which achieves a high throughput of 103Mbps and uses 27 Kilo Gates when implemented in a commercial 180nm CMOS process. The low area is achieved by the proposed in-place architecture. This architecture...
The goal of this paper is to establish the rate region of a wireless multi-hop, one-sender, two-receiver transmission chain. We examine and evaluate the advantages of utilizing directional antennas in this context. In particular, we consider a two-dimensional communication network with a single source node S, two destination nodes D1, D2, and 2 times (N - 1) intermediate nodes placed equidistantly...
In this paper we study a two-hop cooperative communication system to enhance system coverage and data rates for the uplink in a cellular network. The throughput maximization is formulated into a convex optimization problem. A suboptimal numerical algorithm to approach the maximum sum capacity based on the decode and forward scheme is proposed and the numerical algorithm has an iterative implementation...
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