Quantitative evaluation of high speed microwave modem

With advent of the 4 th Generation (4G) mobile network and bandwidth thirsty applications, system operators have been employing different techniques to balance the bandwidth demand.To fulfill the bandwidth requirement, high bandwidth backhaul links are required.Fiber optic can address the bandwidth requirement but at cost of network infrastructure deployment.In order to cut cost microwave radio links are used by wireless network providers.However, the bandwidth of current microwave radio will become a bottle neck for the upcoming high speed wireless standards.Ericsson AB in collaboration with BitSim AB is moving forward to achieve the 10 giga bits per second (Gbps) microwave Link.The work on digital portion is carried out at BitSim AB.In this thesis the digital part of the 10Gbps microwave modem is discussed and much focus is put on the modulation and detection of the symbol.The microwave modem is designed for the E-BAND region of the spectrum at 70/80 GHz.At such high frequency local oscillator mismatch at the transmitter and receiver can introduce high phase noise.Further the Analog to digital converter at such high speed should be much more precise.For countering the phase noise effect, circular 16 Quadrature Amplitude Modulation (QAM) is chosen as the modulation scheme of choice.In this thesis the chosen scheme's performance is tested under phase noise, additive white Gaussian noise (AWGN), quantization noise and is compared with rectangular QAM.At last the day has arrived in the middle of spring in which I have completed my thesis work.Initially, I want to thanks Almighty Allah, who has given me the strength and courage to complete the thesis work.I want to thanks Tryggve Matheison for supervising me during the whole thesis time.Being a digital Guru he has helped me in understanding "how it is done in FPGA".Dr. Hani Mehrpouyan and Dr. Michail Matthaiou, the former being my advisor came to my help in developing the theory of the modulation scheme and noise models.I got stuck at one moment in formulating but there eagle eyes did not let me to get stuck and corrected me where ever i got wrong.Not forgetting Dag Mortensen who helped me in implementing and understanding the design in the FPGA environment.I want to thank my examiner Tommy Svensson, whose valuable comments were of keen importance during thesis.Prayers of my family and friends were with me at every moment of this whole time.They were the motivation and energy to move further.