COGNITIVE RADIO NETWORKS:
The interference to the primary receiver (PR) is a critical issue in the resource allocation of cognitive radio (CR) networks. For instance, the non linearity of the power amplifier (PA) causes nonlinear interference to the PRs.A nonlinear PA with limited dynamic range and a lower limit on the transmit power is assumed for the secondary transmitter (ST). To control the resulting ACI from the ST to the PRs, the PA needs to be turned off in some fading blocks. To investigate the throughput, an analytical expression for the probability of data transmission between the secondary users is derived as a function of the interference temperature limits of the PRs.
Fig:Cognitive radio network
RAPID growth of wireless communications and conventional fixed spectrum allocation policy have led to the problem of spectrum scarcity. However, according to a survey of spectrum utilization in the licensed spectrum is not used efficiently in both temporal and geographical dimensions. Cognitive radio (CR) which is one of the most promising technologies for the future radio spectrum management, improves spectrum utilization by using these underutilized parts of the spectrum. In CR networks, the secondary users are allowed to communicate, provided that the interferences caused to the primary receivers (PRs) are below a given threshold, called interference temperature limit
FOR MORE DETAILS:
ANALYSIS OF THE POWER AMPLIFIER NONLINEARITY ON THE POWER ALLOCATION IN COGNITIVE RADIO NETWORKS
The interference to the primary receiver (PR) is a critical issue in the resource allocation of cognitive radio (CR) networks. For instance, the non linearity of the power amplifier (PA) causes nonlinear interference to the PRs.A nonlinear PA with limited dynamic range and a lower limit on the transmit power is assumed for the secondary transmitter (ST). To control the resulting ACI from the ST to the PRs, the PA needs to be turned off in some fading blocks. To investigate the throughput, an analytical expression for the probability of data transmission between the secondary users is derived as a function of the interference temperature limits of the PRs.
RAPID growth of wireless communications and conventional fixed spectrum allocation policy have led to the problem of spectrum scarcity. However, according to a survey of spectrum utilization in the licensed spectrum is not used efficiently in both temporal and geographical dimensions. Cognitive radio (CR) which is one of the most promising technologies for the future radio spectrum management, improves spectrum utilization by using these underutilized parts of the spectrum. In CR networks, the secondary users are allowed to communicate, provided that the interferences caused to the primary receivers (PRs) are below a given threshold, called interference temperature limit
FOR MORE DETAILS:
ANALYSIS OF THE POWER AMPLIFIER NONLINEARITY ON THE POWER ALLOCATION IN COGNITIVE RADIO NETWORKS
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