function receiver_40a

receiver_40a is a demo of a 40 channel receiver, demodulating 30 channels,

of nominal symbol rate 20 MHz, separated by 28 MHz centers (1.4 times symbol rate)

input sample rate is 40*28 = 1120 MHz.

receiver performs a 40 point transform on the output of a 40-stage polyphase filter

the polyphase filter operates at input rate but outputs at 2 samples/symbol or

40 MHz. The resampling rate is 1120/40 = 28-to-1, thus output 40-channels are

computed once for every 28 input samples. channelizer is not matched filter,

prototype filter is 10 wider than two sided bandwidth of input signal to accommodate

frequency uncertainty of separate channel centers.-function receiver_40a

　receiver_40a is a demo of a 40 channel receiver, demodulating 30 channels,

　of nominal symbol rate 20 MHz, separated by 28 MHz centers (1.4 times symbol rate)

　input sample rate is 40*28 = 1120 MHz.

　receiver performs a 40 point transform on the output of a 40-stage polyphase filter

　the polyphase filter operates at input rate but outputs at 2 samples/symbol or

　40 MHz. The resampling rate is 1120/40 = 28-to-1, thus output　40-channels are

　computed once for every 28 input samples. channelizer is not matched filter,

　prototype filter is 10　wider than two sided bandwidth of input signal to accommodate

　frequency uncertainty of separate channel centers.