(a) (3%) The bit error rate (BER) performance upon various E/No (i.e., SNR) of AWGN, Rayleigh, and Rician channel models for QAM modulation technique is shown below. We found that, to achieve the same BER, the SNR thresholds of three channel models are SNRAWGN>SNRRician>SNRRayleigh- Please briefly explain this. BER With Respect To Eb/NO AWGN -Rayleigh Rician 10 10 10 BER 10 10 10 16 10 Eb/No (b) (3%) Assume the carrier frequency is 2 GHz, the wave velocity is light speed (3x108 m/s), the receiver moving speed is 5.15x109 m/s, and the source is static. What's the corresponding Doppler shift? (c) (4%) The BER performance of different Doppler shift upon 15dB SNR for various modulation techniques is shown below. Based on the Doppler shift derived in (b), if the BER threshold is set to be 103 (i.e., the actual BER should be less than the predefined threshold), which modulation technique should the sender utilize? VBLAST-MIMO-OFDM -1 :16 QAM -QPSK BPSK 102 BER 102 104 0 100 200 500 600 700 300 400 Doppler in Hz (a) (3%) The bit error rate (BER) performance upon various E/No (i.e., SNR) of AWGN, Rayleigh, and Rician channel models for QAM modulation technique is shown below. We found that, to achieve the same BER, the SNR thresholds of three channel models are SNRAWGN>SNRRician>SNRRayleigh- Please briefly explain this. BER With Respect To Eb/NO AWGN -Rayleigh Rician 10 10 10 BER 10 10 10 16 10 Eb/No (b) (3%) Assume the carrier frequency is 2 GHz, the wave velocity is light speed (3x108 m/s), the receiver moving speed is 5.15x109 m/s, and the source is static. What's the corresponding Doppler shift? (c) (4%) The BER performance of different Doppler shift upon 15dB SNR for various modulation techniques is shown below. Based on the Doppler shift derived in (b), if the BER threshold is set to be 103 (i.e., the actual BER should be less than the predefined threshold), which modulation technique should the sender utilize? VBLAST-MIMO-OFDM -1 :16 QAM -QPSK BPSK 102 BER 102 104 0 100 200 500 600 700 300 400 Doppler in Hz