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In this paper, we propose an adaptive-power-control scheme for a cognitive radio system (CRS) in a Rayleigh fading channel. By allowing transmit power adaptation at the secondary user (SU) transmitter to maintain a constant output SNR to the SU receiver, this scheme maximizes the output SNR and limits the interference to a primary user (PU) within an interference constraint. To calculate this maximum...
An adaptive power control scheme for cognitive radio system (CRS) in Rayleigh fading channel is proposed. The transmit power of a secondary user (SU) is adjusted in Rayleigh fading to maximize the constant output signal-to-noise ratio (SNR) at an SU receiver while keeping the interference to a primary user (PU) under given constraints. To calculate the maximum constant output SNR at the SU receiver...
This paper addresses the transmit power control with multiple antennas. A theoretical comparison of transmit diversity and beamforming techniques in the presence of fading correlation at an antenna array and handoff is presented. The objective is to investigate transmit power of both system and investigate the effect of array perturbations that exist in practical applications of antenna arrays. The...
Multi-phase cooperative communication in a wireless network is studied in this paper. Each node is a mobile module having multiple antennas (MA) or a group of sensors forming a virtual antenna array (VAA). The scenario comprises a number of multiple-input multiple-output (MIMO) channels with mutually independent Rayleigh fading processes. A data frame from a signal source node is split into portions...
The performance of a multi-phase cooperative communication is studied in a wireless network. Each node is a mobile module having multiple antennas (MA) or a group of sensors forming a virtual antenna array (VAA). The scenario comprises a number of multiple-input multiple-output (MIMO) channels with mutually independent Rayleigh fading processes. A data frame from a signal source node is split into...
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