140 research outputs found
Compressive Sensing for Spread Spectrum Receivers
With the advent of ubiquitous computing there are two design parameters of
wireless communication devices that become very important power: efficiency and
production cost. Compressive sensing enables the receiver in such devices to
sample below the Shannon-Nyquist sampling rate, which may lead to a decrease in
the two design parameters. This paper investigates the use of Compressive
Sensing (CS) in a general Code Division Multiple Access (CDMA) receiver. We
show that when using spread spectrum codes in the signal domain, the CS
measurement matrix may be simplified. This measurement scheme, named
Compressive Spread Spectrum (CSS), allows for a simple, effective receiver
design. Furthermore, we numerically evaluate the proposed receiver in terms of
bit error rate under different signal to noise ratio conditions and compare it
with other receiver structures. These numerical experiments show that though
the bit error rate performance is degraded by the subsampling in the CS-enabled
receivers, this may be remedied by including quantization in the receiver
model. We also study the computational complexity of the proposed receiver
design under different sparsity and measurement ratios. Our work shows that it
is possible to subsample a CDMA signal using CSS and that in one example the
CSS receiver outperforms the classical receiver.Comment: 11 pages, 11 figures, 1 table, accepted for publication in IEEE
Transactions on Wireless Communication
Demodulating Subsampled Direct Sequence Spread Spectrum Signals using Compressive Signal Processing
We show that to lower the sampling rate in a spread spectrum communication
system using Direct Sequence Spread Spectrum (DSSS), compressive signal
processing can be applied to demodulate the received signal. This may lead to a
decrease in the power consumption or the manufacturing price of wireless
receivers using spread spectrum technology. The main novelty of this paper is
the discovery that in spread spectrum systems it is possible to apply
compressive sensing with a much simpler hardware architecture than in other
systems, making the implementation both simpler and more energy efficient. Our
theoretical work is exemplified with a numerical experiment using the IEEE
802.15.4 standard's 2.4 GHz band specification. The numerical results support
our theoretical findings and indicate that compressive sensing may be used
successfully in spread spectrum communication systems. The results obtained
here may also be applicable in other spread spectrum technologies, such as Code
Division Multiple Access (CDMA) systems.Comment: 5 pages, 2 figures, presented at EUSIPCO 201
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