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Capacity-coverage tradeoff balancing is a classical but critical problem for practical wireless multi- cell network optimization. Increasing the average capacity is often at the expense of decreasing the cell coverage and vice versa. It becomes more complex in massive multiple-input/multiple-output (MIMO) networks to balance the above two performance indicators since capacity is much highly improved...
In this paper, we propose a practical nullspace-based secondary joint transceiver scheme for the coexistence of a secondary system and a primary system in cognitive radio MIMO (CR-MIMO) networks using second-order statistics. First, we propose a secondary transmission frame structure, and briefly describe the periodical nullspace sensing procedure for both the secondary transmitter (ST) and secondary...
In this paper, we propose a null space-based precoding scheme for secondary transmission in a cognitive radio multiple-input multiple-output (CR-MIMO) network under the assumption that time-division-duplex is employed by the primary transmission. First, the secondary transmitter periodically senses the transmitted signals from the primary users and estimates the corresponding covariance matrix. Then,...
The carrier frequency offset (CFO) could destroy the orthogonality of OFDM subcarriers and induce the inter-carrier interference (ICI) spread. However, the generalized multi-carrier (GMC) system reflects different interference characters in the presence of CFO. In this paper, we exactly analyze the CFO effect on GMC, which multiplexes several single band single carrier based frequency division multiple...
Discrete fourier transform spread generalized multi-carrier (DFT-S-GMC) scheme is a promising candidate for the uplink transmission of the new generation broadband mobile communications due to its lower peak-to-average power ratio and its robustness to the multi-user interference if compared with the conventional orthogonal frequency division multiple (OFDM)-based transmission schemes. However, the...
Spectrum sensing is the necessary function to achieve spectrum sharing. Distributed and collaborative spectrum sensing can improve the sensing credibility greatly, however when there are too many sensing nodes in the cognitive radio system, for example IEEE802.22 Wireless Regional Area Network system, it will produce large signaling overhead. To reduce the signaling overhead, the selection of sensing...
Close loop transmission incorporating preceding, rate and power loading etc, can improve the performance of multiple-input multiple-output (MIMO) antenna system and draw much attention in recent research. However, the feedback overhead of channel information may significantly reduce the system throughput especially in FDD mode. In this paper, a statistical information based partial feedback scheme...
A cumulant-based joint angle-frequency estimation (CB-JAFE) algorithm for angle-frequency parameter estimation of independent nonGaussian sources is proposed. The proposed CB-JAFE algorithm, which utilizes the fourth-order cumulants of the spatio-temporal data, can effectively suppress the spatially and temporally correlated Gaussian noise with unknown correlation structure. Simulation results are...
The adaptive transmission mode selection (ATMS) scheme increases the spectrum efficiency and the flexibility of radio resource management for the distributed wireless communication systems (DWCS). In this paper, different optimal regions are planned for the adaptively selected transmission modes, based on the received signal to noise ratio (SNR) from each access point (AP) and the required quality-of-service...
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