Then the received signal is demodulated using coherent BPSK receiver (i.e., correlation receiver
) and matched filtering is followed by despreading the demodulated signal at the receiver side.
It is well known that the BER of a correlation receiver
is [P.sub.e] = Q([square root of ([E.sub.b](1 - [rho])/[N.sub.0])]), where [E.sub.b] = 1/[E.sub.b] [[integral].sup.T.sub.0] [s.sup.2.sub.0](t)dt and [rho] = 1/[E.sub.b] [s.sub.0](t)[s.sub.1](t)dt .
Hence CDMA receiver may combine the time-shifted versions of the original signal by providing a separate correlation receiver
for each of the multipath signals.
Correlation receiver is a widely used method of detecting objects in free space.
However, the correlation receiver does not operate well for a GPR because the waveform of the received GPR signal is distorted by the dispersive media underground, and the received signal model described by (2) is not valid.
Consider using a correlation receiver
to coherently demodulate the desired user's signal.
Basically, this is a coherent radar transmitting preregistered pseudorandom signals and using a correlation receiver
(or a mismatched, range-side lobe suppression receiver).
Assuming a correlation receiver
, the optimal template v(f) should be matched to the received pulse.
It is supposed that the correlation receiver
is matched to the (K+1)-th transmitter spreading sequence [c.sub.K+1].
In the case of the correlation receiver
detector, UWB and gate pulses are multiplied to produce a short output unamplified pulse whenever there is a coincidence.
Teplee, "BER performance of UWB communications with matched filter and correlation receivers
," in Proceeding of the ECTI International Conference, 2007
The proposed methods include arrays of emitters and trains of pulses in conjunction with correlation receivers