6. [2 Points] Repeat Question 4 above, assuming L receive antennas (antenna diversity ). Assume Lindependent channels, where each channel experiences a Rayleigh fading in addition to the additive white gaussian noise (AWGN). Particularly, a) [1 Point Write the formula for the received vector y, as a function of the transmitted symbol x, channel vector h, and channel noise vector ?. [Module2, Lecture 5, slide 5] b) [1 Point) Describe the optimum detection and demodulation algorithm, which processes the received vector y, to be able to demodulate the transmitted symbol. [Module2, Lecture 5, slide 6]