Digital Signal Processing Reference
In-Depth Information
the measurement the precision improvement measures. By FFT operation due to
single-bit receiver, the signal amplitude information is lost, it can not directly measure
the direction of arrival of the signal using amplitude comparison method, but it can
take advantage of multi-element digital beam former technology than amplitude
measurement by improving transform FFT points of the direction of arrival of the
target signal, digital channel phase comparator is placed after the receiver of the
single-bit, and find other single bit DFT transform kernel function in order to improve
the accuracy of frequency measurement of the single-bit receiver.
1.1
Construction of Simulation System Based on Simulink
The use of the Matlab simulink building single-bit receiver simulation system, such as
the composition diagram of the system according to Fig. 1 single bit receiver
measurement frequency to build simulink simulation system. In order to compare
single-bit receiver and the other measured frequency receiver performance
differences, seeking single-bit receiver frequency receiver combined with other
measurements to compensate for their own lack of possibility, and also need to build a
frequency measurement receiver simulink simulation modulesuch as building the
broadband digital signal channelized receiver, digital channelized receiver orders bit
the receiver frequency measurement system[1].
Fig. 1.
Construction of single-bit receiver frequency measurement system block diagram
simulink simulation system
1.2
Algorithm Principle
The single-bit receiver by multiplication, in the discrete Fourier transform is not only
for addition and subtraction, so that the hardware design to simplify DFT operation
becomes very simple. AS formulas(1)showed, Simplify the operation, there are two:
one is the use of one of the ADC, its output is only +1 and -1, i.e., the DFT of input
data only two situations; second is the DFT computation kernel function in the
number of bits reduced to 1, about the kernel function is set to 1, -1, j, -j.
