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Mathematics, 30.06.2019 05:00 hello4540
In a binary communication system a 1 is transmitted by sending a +1 volt pulse and a 0 is transmitted by sending a −1 volt pulse. at the receiver the transmitted pulse is added with a noise z which has a gaussian distribution with z ∼ n (0, 1). in other words, if x is transmitted (x can be ±1 volts) we receive y = x + z. the receiver compares y with zero, if y > 0 it declares that a 1 was sent and if y ≤ 0 is declares that a 0 was sent. a. suppose that the receiver decides a 0 was sent if y< 0, and a 1 was sent if y> =0. what is the probability that the receiver makes an error given that a+1 was transmitted? a-1 was transmitted? b. what is the overall probability of error?
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