Interference mitigation in colocated wireless systems


Ahmed, Shabbir (2012) Interference mitigation in colocated wireless systems. PhD thesis, Victoria University.


The placement of base station transceivers at close proximity to one another is a major challenge for RF engineers. In a colocated setting, the base station receivers have to receive weak desired signals in the presence of high-power transmit/jamming signals from colocated base station transmitters; resulting in major interference issues. The thesis identifies two major mechanism of interference for the colocated victim receiver. First, the strong jamming signals mix within the victim receiver front-end to produce intermodulation products that may fall on its desired receive channel and cause interference. The strong signals may also saturate the receiver circuits and cause desensitization. Second, large jamming signals from one colocated transmitter can radiate into the antenna system of a second colocated transmitter. The signals enter the second transmitter in the reverse direction and mix in the output stage of its power amplifier to produce intermodulation products. These ‘reverse’ intermodulation products get radiated from the antenna system and may fall on the victim receiver’s desired channel.

Item type Thesis (PhD thesis)
Subjects Historical > FOR Classification > 1005 Communications Technologies
Historical > Faculty/School/Research Centre/Department > School of Engineering and Science
Keywords adaptive cancellation system, dynamic range optimized interference cancellation, postdistortion cancellation system, reverse IM products, multi-loop adaptive, radio frequency transceiver antennas, tranceivers, cognitive sensing, jammer selection
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