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—Orthogonal frequency-division multiplexing (OFDM) effectively mitigates intersymbol interference (ISI) caused by the delay spread of wireless channels. Therefore, it has been used in many wireless systems and adopted by various standards. In this paper, we present a comprehensive survey on OFDM for wireless communications. We address basic OFDM and related(More)
With explosive growth of high-data-rate applications, more and more energy is consumed in wireless networks to guarantee quality-of-service (QoS). Therefore, energy-efficient communications have been paid increasing attention under the background of limited energy resource and environmental-friendly transmission behaviors. In this article, basic concepts of(More)
—Cooperative base station transmission, which is also called coordinated multi-point (CoMP) transmission, can significantly enhance spectrum efficiency of future cellular systems. To gain the promised benefits of coherent CoMP transmission, limited feedback is necessary for conveying channel state information in frequency division duplex systems. In this(More)
—In this paper, we analyze the feasibility of linear interference alignment (IA) for multi-input-multi-output (MIMO) interference broadcast channel (MIMO-IBC) with constant coefficients. We pose and prove the necessary conditions of linear IA feasibility for general MIMO-IBC. Except for the proper condition, we find another necessary condition to ensure a(More)
Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works, must be obtained from the IEEE. Abstract—Base station cooperative(More)
—Coordinated multi-point (CoMP) transmission through joint processing (JP) and coordinated beamforming (CB) is promising to provide high spectral efficiency by avoiding in-tercell interference in downlink heterogeneous cellular networks. Pseudo-inverse based zero-forcing beamforming (P-ZFBF) is a popular low-complexity multiuser precoder that can achieve(More)
—In this paper, we investigate power and channel allocation for cooperative relay in a three-node cognitive radio network. Different from conventional cooperative relay channels, cog-nitive radio relay channels can be divided into three categories: direct , dual-hop, and relay channels, which provide three types of parallel end-to-end transmission. In the(More)