Automatic Transmit Power Control of a Digital Fixed Wireless Link with Co-Channel Interference

Link Adaptation for Microwave Link using both MATLAB and Path-Loss Tool

“…These detrimental effects of signal fading call for an appropriate measure that can mitigate it. Different measures such as space diversity [3][4][5], automatic transmit power control (ATPC) [6], adaptive equalization, multilevel coded modulation (MLCM) [7,8], forward error correction (FEC), and cross-polarization interference cancellers (XPICs) [9] have been proposed in the literature to address the challenges of signal fading. However, aiming at the inherent capacity of wireless channel, it is obvious that technology which adapt and adjust transmission parameters in real-time based on the link quality will be the appropriate solution to both the problems of channel impairments and bandwidth in wireless communication.…”

“…This is based on the CSI feedback that enables dynamic radio link adaption. An example of adaptive technique being implemented in the microwave radio links to combat fading is ATPC which is also known as power diversity [6]. Conceptually, a threshold power is set to achieve a given BER under good channel conditions.…”

“…The Tx power can be adjusted (increased or decreased) dynamically according to the link condition. However, the increase in power when the CSI is poor should not exceed the set threshold value so as to prevent co-channel interference (CCI) [6,22]. Moreover, an alternative approach of achieving a desired QoS is by the use of adaptive modulation scheme in which the power and modulation level can be dynamically altered in order to regulate the link ability to conform to the set transmission conditions [22].…”