I have a hw problem in which I have to find the absolute and 6 dB bandwidth. I know how to get the absolute bandwidth, I have the formula. I have no idea how to get the 6 dB bandwidth. This is the problem:
"Assume that a telephone line channel is equalized to allow bandpass data transmission over a frequency range of 600 to 3000 Hz with raised cosine filtering (pulses). The available channel bandwidth is 2400 Hz with the mid-channel frequency of 1800 Hz.
a) Design a 2400 bps QPSK transmission system with F(0) = 1800 Hz. Show that the spectrum of this signal will fit into the channel when alpha=1. Find the absolute and 6-dB bandwidths."
Formula for absolute bandwidth = R(1+alpha)/2. Need to know how to get to 6-db bandwidth. Thanks for the help.
"Assume that a telephone line channel is equalized to allow bandpass data transmission over a frequency range of 600 to 3000 Hz with raised cosine filtering (pulses). The available channel bandwidth is 2400 Hz with the mid-channel frequency of 1800 Hz.
a) Design a 2400 bps QPSK transmission system with F(0) = 1800 Hz. Show that the spectrum of this signal will fit into the channel when alpha=1. Find the absolute and 6-dB bandwidths."
Formula for absolute bandwidth = R(1+alpha)/2. Need to know how to get to 6-db bandwidth. Thanks for the help.
