$2.$Binary Frequency Shift Keying $($BFSK$)$ modulation uses two frequencies $($high and low$)$ to represent logic level $0$ and $1.$ If the transmitted signal is polar NRZ $($rectangular in shape, with length T $).$ In the frequency domain, the signals follow a sinc function form $($as shown in figure $22).$ A spectrum of such transmitted signal modulated using BFSK is shown in figure $6\mathrm{.}8-2.$

Suppose you have bandwidth of only $200$ kHz $,$ and the nominal center frequency, $f_0,$ is $1$ MHz $.$ Determine maximum bitrate, minimum bit pulse duration, and propose two center frequencies for BFSK $(f_L$ and $f_H).$

Figure $2-1.$ Example of Polar NRZ signal

Figure $2-2.$ Time domain and frequency domain representation of rectangular pulse