Adaptive Power Allocation Schemes for Spectrum Sharing in Interference-Alignment-Based Cognitive Radio Networks Abstract? Interference alignment (IA) is a promising technique for interference management and can be applied to spectrum sharing in cognitive radio (CR) networks. However, the sum rate may fall short of the theoretical maximum, particularly at low signal-to-noise ratio (SNR), and the quality…
Amplify-and-Forward Relay Sharing for Both Primary and Cognitive Users Abstract? Four amplify-and? forward (AF) relaying schemes for both the primary user (PU) and the cognitive user (CU), depending on whether both users transmit their signals to the common relay in parallel or serially and whether the relay forwards their signals to the respective receivers in…
An Efficient Bayesian PAPR Reduction Method for OFDM-Based Massive MIMO Systems Abstract? The problem of peak-to-average power ratio (PAPR) reduction in orthogonal frequency-division multiplexing (OFDM) based massive multiple-input multiple-output (MIMO) downlink systems. Specifically, given a set of symbol vectors to be transmitted to K users, the problem is to find an OFDM-modulated signal that has…
An Empirical Study for PCA- and LDA-Based Feature Reduction for Gas Identification Abstract?Increasing the number of sensors in a gas identification system generally improves its performance as this will add extra features for analysis. However, this affects the com-putational complexity, especially if the identification algorithm is to be implemented on a hardware platform. < final…
BER analysis of conventional and wavelet based OFDM in LTE using different modulation techniques Abstract-Orthogonal Frequency Division Multiplexing (OFDM) and Multiple Input and Multiple Output (MIMO) are two main techniques employed in 4th Generation Long Term Evolution (LTE). In OFDM multiple carriers are used and it provides higher level of spectral efficiency as compared to…
Bit Error Floor of MPSK in the Presence of Phase Error Abstract?In mobile communication systems, one of the most significant factors of the bit-error-rate (BER) performance degradation of M-ary phase-shift keying (MPSK) is random phase error caused by phase-locked loop (PLL) or imperfect channel estimation. For high-signal-to-noisepower- ratio (SNR) regions, the effect of random phase…
Broadband Dual-Polarization and Stable-Beamwidth Slot Antenna Fed by U-Shape Microstrip Line Abstract? A novel broadband dual-polarized slot antenna with stable radiation pattern is presented. Two U-shape microstrip lines are introduced at two feeding ports to excite a cross-shape slot for realizing dual-polarized antenna. The simulated results are given to explain how the ground plane, short…
Carrier Frequency Offset Estimation for CO-OFDM: The Matched Filter Approach Abstract-This paper proposes a novel carrier frequency offset (CFO) estimator for coherent optical orthogonal frequency division multiplexing (CO-OFDM) systems using the matched filter (MF) concept. We consider an OFDM symbol with N subcarriers so that the receiver takes N time-samples of the received noisy CO-OFDM…
Channel and Power Adaptation for Cognitive Radios in Multiuser OFDM Systems Abstract? we investigate joint power and channel allocation problem for the orthogonal frequencydivision multiplexing (OFDM) based multi-user cognitive radio systems with quality-of-service (QoS) in terms of signalto- interference-plus-noise ratio (SINR) and proportional rate constraints. The QoS requirement of each cognitive radio user imposed by…
Channel Estimation and Detection in Satellite Communication Systems Abstract?The problem of channel estimation and detection in shadowed Rician (SR) fading land mobile satellite (LMS) channels is studied. It s assumed that the satellite contains a single antenna and that the earth station has multiple antennas. In the proposed detector, joint channel estimation and detection of…
