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In this paper we design high performance multiple-input-multiple-output (MIMO) receivers for the DFT-Spread-OFDM based long term evolution (LTE) cellular uplink. In the LTE uplink multiple single-antenna users can be scheduled on the same time-frequency resource block via space division multiple access. The designed receivers are also applicable to the LTE-Advanced cellular uplink wherein simultaneous...
In this paper, we consider the problem of resource allocation in the DFT-Spread-OFDMA (DFT-S-OFDMA) uplink. We show that the resource allocation problem can be formulated as a set packing problem, which in general is NP-hard. We propose polynomial-time message-passing based algorithms, one of which is guaranteed to yield a solution that is within a constant fraction of the optimal solution and is...
DFT-spread-OFDMA (DFT-S-OFDMA) technique has been adopted as the uplink access scheme in emerging cellular systems such as the 3GPP long term evolution (3GPP-LTE), in order to reduce the peak-to-average-power ratio (PAPR). In this scheme, data symbols are pre-coded using a DFT operation at the transmitter before being sent to the OFDM modulator. Moreover, emerging cellular systems will also deploy...
We propose resource allocation algorithms based on the auction method for uplink OFDMA cellular networks. We consider cellular systems that employ the traditional static frequency reuse as well as the next-generation systems that aim to achieve a universal frequency reuse via base-station coordination. Our algorithms are designed for finite input alphabets and also account for non-ideal practical...
We consider the problem of co-channel interference mitigation in a downlink multi-cell wireless network. Assuming that each access point serves multiple single-antenna mobiles via space division multiple access (SDMA), we jointly optimize the linear beam-vectors across a set of coordinated cells and resource slots: the objective function to be maximized is the weighted system sum-rate subject to per-base-station...
We consider a downlink OFDMA cellular network wherein groups of access points are coordinated and we address the problem of jointly selecting the set of co-channel users and the power allocation across tones in order to maximize the weighted system sum-rate subject to per-base-station power constraints. To solve this problem, we propose a successive convex approximation for low-complexity (SCALE)...
An IDM-based space-time scheme is proposed to increase cell-edge throughput in the present of one main out-cell interference. Our results show that for low-rate applications, the proposed scheme can effectively remove the out-cell interference and exhibit a significant gain over the traditional STBC-based scheme. With excellent performance and low-complexity, our scheme is a promising candidate for...
We consider a downlink OFDMA cellular network wherein groups of coordinated access points can share user channel quality measurements and we address the problem of jointly selecting the set of co-channel users and the power allocation across tones in order to maximize the weighted system sum-rate subject to per-base-station power constraints. A novel improved iterative water-filling algorithm (I-IWF)...
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