Benefits to processor load for quadrature baseband versus radio frequency demodulation algorithms

[摘要] The continued advancement and improvement of software-defined radio technology hasbeen a key factor in furthering research into the implementation of most signalprocessing algorithms at baseband. Traditionally, these algorithms have been carriedout at RF, but with the coming of SDR, there has been a need to shift the processingdown to baseband frequencies which are more compatible with the fast developingsoftware radio technology.The study looks at selected demodulation algorithms and investigates thepossibility and benefits of carrying them out at QBB. The study ventures into the areaof beamforming, multipath compensation, Doppler shift compensation and matchedfilter detection. The analysis is carried out using Matlab simulations at RF and QBB.The results obtained are compared, not only to evaluate the possibility but also thebenefits in terms of the processing load. The results of the study showed that indeed,carrying out the selected demodulation algorithms at QBB was not only possible, butalso resulted in an improvement in the processing speed brought about by the reductionin the processing load.

[发布机构] Stellenbosch University