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In the 5th generation cellular system, a large-scale cloud radio access network is one of the most promising structures for providing high quality-of-service to end users. This extended abstract presents the impact of interference on such a system. Based on stochastic geometry and probabilistic order notation, the scaling exponents of the guaranteed signal-to-interference-plus-noise ratio and the...
In this letter, a low-complexity but near-optimal DFT-based channel estimator with leakage nulling is proposed for OFDM systems using virtual subcarriers. The proposed estimator is composed of a time-domain (TD) index set estimation considering the leakage effect followed by a low-complexity TD post-processing to suppress the leakage. The performance and complexity of the proposed channel estimator...
Small cell networks have many attractive solutions to solve the network overload caused by heavy demands of traffic. To evaluate the performance of systems, a system-level simulator (SLS) is typically used. However, the performance evaluation with a typical channel parameter set which is representing the entire area in SLS shows only the typical performance of the entire area, so that extra field...
Femtocell is a small base station with low power which can be installed by users to get better data rate in the indoor environment. The power control scheme of the femtocell BS is the most important issue in the femtocell implementation but there still exist deadzones if macrocell users are located very close to the femtocell. In this paper, we have proposed a new frame structure for the IEEE 802...
We consider multiuser multicarrier systems, where each non-symmetrically distributed user reports only partial indices of subcarriers whose normalized SNRs exceed the predetermined threshold so that only partial feedback information is available at the base station. To accommodate both efficiency and fairness, the base station is assumed to perform the normalized SNR based proportional fair scheduling...
In this paper, we propose a novel and efficient OS scheme with partial CQRI feedback. The average system capacity of the proposed OS scheme with partial CQRI feedback is analyzed as well as those of the conventional OS schemes with full and partial CQI feedbacks. Analysis and simulation results show that the proposed scheme improves system performance in terms of the average system capacity, especially...
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