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In this paper, we present a pilot design for an OFDM cellular system based on Costas arrays. The design provides pilot symbols for both common and dedicated pilots for MIMO transmission. The pilot symbols are designed so that pilots from different cells intersect minimally. The design results in a large number of available distinct pilot symbol patterns with minimally overlapping resource elements...
The effective method of two-way relaying for TDD (Time Division Duplex) wireless systems is described. In a traditional two-way relaying without network coding four time slots are needed in the TDD mode to exchange data blocks between two stations, e.g. mobile (MS) and base (BS) stations via a relay station (RS). In the proposed solution the number of slots is reduced to two only - the multiple access...
MIMO downlink with base station coordination in a cellular network is considered. In centralized coordinated transmission from a cluster of base stations, the channel state information (CSI) of users needs to be sent to a central processor for user scheduling and resource allocation. Real time CSI feedback from the users to their home base station and from the base stations to the central processor...
Base station cooperation (BSC) has been identified as a key radio access technology for next-generation cellular networks such as LTE-Advanced. BSC maximizes its gains over non-cooperation (NC) in a network wherein interference from cooperating BSs is the main limitation. However, at locations where the signals from non-cooperating BSs are the dominant interference, the gains are minimal. Therefore,...
In this work we study a two-user multiple antenna system under quasi-static fading employing a novel scheme that combines cooperation and iterative multiuser detection based on minimum mean square error estimation. We investigate three different receivers: a joint detector for the two users, a separate (per-user) detector, and a distributed matrix-Alamouti detector. We show that the separate detector...
In modern cellular systems, high-rate communication is performed using MIMO transmission by a single base station (BS). This method is able to improve the transmission rate when the user is at the cell-inner. However the rate severely degrades when the user is located at cell-edge. Base station cooperation (BSC) MIMO is solve the cell-edge problem. BSC MIMO can improve capacity at the cell-edge than...
It is well known that performance of MIMO system is greatly improved by used of spatial multiplexing and diversity. However, the performance of cell edge is dramatic depressed because of the inter-cell interference. This paper analysis the multi-cell coordinated transmission model and propose an JP(Joint Procession)-Multi-cell BD(Block Diagonalization) algorithm. Moreover, the different schedule strategies...
Cooperative MIMO is a key technology for next generation mobile communications. This technique is used to improve cell edge throughput performance. In this paper, we propose a cooperative MIMO scheme with FFR, and evaluate downlink performance of the scheme. We use 3 sector structures per cell. The sector cell is divided into two regions, inner cell and outer cell. The frequency reuse factor (FRF)...
This paper investigates the impact of limited feedback on user throughput in the uplink of a cellular system. We consider scenarios where the base-station has limited feedback resources, which it needs to allocate across the users it serves. We propose a general model that captures the effect of feedback allocation on the achievable rates for a user, which allows us to characterize the rate region...
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