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We analyze the performance of anti-metal tags when they work in EMC (Electro Magnetic Compatibility) chamber and in substation. It is meaningful to the promotion of RFID(Radio Frequency Identification) tags applied in substation.
This paper considers resource allocation and transmission optimization for femtocell networks, where the orthogonal frequency division multiple access (OFDMA) strategy is used to cope with the multi-user communication. In an attempt to mitigate cross-tier interference and optimize multi-user network performance, a two-layered beamforming scheme is proposed, facilitated by the multiple-input-multiple-output...
In this paper, we investigate the pricing and resource allocation strategies in the two-tier sensing-based cognitive fem-tocell networks, where the macrocell and femtocells are operating over the same frequency band. The macrocell base station protects itself by setting the maximum aggregate interference constraint and makes profit by pricing the interference from femtocell users. Different from the...
In this paper, we design downlink (DL) beamforming vectors for a multiuser multicell cognitive radio (CR) network with imperfect channel state information (CSI) at base stations (BS). Specifically, we consider deterministic error in both channel gain and channel covariance. Our objective is to minimize the total DL transmit power subject to quality of service (QoS) constraints of each secondary user...
In this paper, we investigate the performance enhanced transceiver design in a Device-to-Device (D2D) communication system underlaying a cellular network. The problem of joint transmitter and receiver optimization via maximizing the entire D2D and cellular transmission rate is considered. Due to the non-convexity of the primal problem, we resort to decomposing the problem into a sequence of standard...
This paper studies robust beamforming design in a relay-assisted multiuser multi-antenna cognitive radio (CR) network that coexists with a primary radio (PR) system via opportunistic spectrum sharing (OSS). The robustness is with respect to imperfect channel knowledge at transmitter. Since the CR-to-PR interference needs to be carefully mitigated in OSS, the recently developed cognitive beamforming...
In this paper, we design a null-space based robust interference avoiding strategy for the Device-to-Device (D2D) communication underlaying network. Thanks to the coordination between D2D user and the regular user, the interfering channel state information (CSI) among the base station (BS), cellular user equipment (CUE) and the D2D user equipments (DUEs) can be estimated from the training approach...
In this paper, spectrum-sensing based resource allocation for a cognitive radio network that contains multiple secondary users (SUs) and a primary user (PU) is investigated. Each SU firstly performs the individual spectrum sensing and forwards the result to a fusion center to make the global decision. If PU is determined absent, then SUs access the primary band with their regular transmit power. Otherwise...
In this paper, we consider a pair of cognitive radio (CR) users co-existing with a pair of ARQ- based primary users (PU). The secondary user (SU) overhears the ACK/NACK feedback sent from the receiver of the primary system, and then decides to access the spectrum or not. An opportunistic sharing scheme, referred to as Spectrum sHaring with ARQ Retransmission and Probing timeslots (SHARP), is proposed...
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