Technical Information

Technical Specifications

Modulation

YQASK

Data Rate

24 kbits/sec

Pulse Shape

square-root raised cosine
50% excess bandwidth

Data Sequence

511-bit PN sequence
download the MATLAB file
containing this bit sequence

Radio Frequency (RF)

924 MHz

Differential Encoding

Input Bits	Phase Shift
0 0	0*
0 1	(move to origin)
1 0	-120 degrees*
1 1	+120 degrees*

The Presentation

Download the presentation from the first class meeting.

Test Data Files

The test data files contain samples of the baseband I and Q outputs that your receiver front-end will be providing the A/D converters for the various scenarios described below. The sample rate is 48 ksamples/sec and each file represents approximately 12 seconds worth of data.

Name	Description
YQASK_IQ_nde.mat	YQASK_IQ_nde.mat contains samples of the baseband YQASK modulated signal with the PN9 sequence with NO DIFFERENTIAL ENCODING. The data are stored in an L x 2 array. The first column, X(:,1), contains samples of the I output and the second column, X(:,2), contains samples of the Q output. This matrix represents about 12.42 seconds of data.
YQASK_de.mat	YQASK_de.mat contains samples of the baseband YQASK modulated signal with the DIFFERENTIALLY ENCODED PN9 sequence. The data are stored in an L x 1 complex-valued vector where the real part contains samples of the I output and the imaginary part contains samples of the Q output.
YQASK_de_rotate1.mat	YQASK_de_rotate1.mat contains samples of the baseband YQASK modulated signal with the DIFFERENTIALLY ENCODED PN9 sequence and a constant phase rotation. The data are stored in an L x 1 complex-valued vector where the real part contains samples of the I output and the imaginary part contains samples of the Q output.
YQASK_de_rotate2.mat	YQASK_de_rotate2.mat contains samples of the baseband YQASK modulated signal with the DIFFERENTIALLY ENCODED PN9 sequence and a small frequency offset. The data are stored in an L x 1 complex-valued vector where the real part contains samples of the I output and the imaginary part contains samples of the Q output.
YQASK_de_SNR20dB.mat	YQASK_de_SNR20dB.mat contains samples of the baseband YQASK modulated signal with the DIFFERENTIALLY ENCODED PN9 sequence with noise such that Eb/No = 20 dB. No carrier phase synchronization is presumed. The data are stored in an L x 1 complex-valued vector where the real part contains samples of the I output and the imaginary part contains samples of the Q output.
YQASK_de_SNR10dB.mat	YQASK_de_SNR10dB.mat contains samples of the baseband YQASK modulated signal with the DIFFERENTIALLY ENCODED PN9 sequence with noise such that Eb/No = 10 dB. No carrier phase synchronization is presumed. The data are stored in an L x 1 complex-valued vector where the real part contains samples of the I output and the imaginary part contains samples of the Q output.