43,447 research outputs found
A Two-Dimensional Signal Space for Intensity-Modulated Channels
A two-dimensional signal space for intensity- modulated channels is
presented. Modulation formats using this signal space are designed to maximize
the minimum distance between signal points while satisfying average and peak
power constraints. The uncoded, high-signal-to-noise ratio, power and spectral
efficiencies are compared to those of the best known formats. The new formats
are simpler than existing subcarrier formats, and are superior if the bandwidth
is measured as 90% in-band power. Existing subcarrier formats are better if the
bandwidth is measured as 99% in-band power.Comment: Submitted to IEEE Communications Letters, Feb. 201
Designing Power-Efficient Modulation Formats for Noncoherent Optical Systems
We optimize modulation formats for the additive white Gaussian noise channel
with a nonnegative input constraint, also known as the intensity-modulated
direct detection channel, with and without confining them to a lattice
structure. Our optimization criteria are the average electrical and optical
power. The nonnegativity input signal constraint is translated into a conical
constraint in signal space, and modulation formats are designed by sphere
packing inside this cone. Some remarkably dense packings are found, which yield
more power-efficient modulation formats than previously known. For example, at
a spectral efficiency of 1 bit/s/Hz, the obtained modulation format offers a
0.86 dB average electrical power gain and 0.43 dB average optical power gain
over the previously best known modulation formats to achieve a symbol error
rate of 10^-6. This modulation turns out to have a lattice-based structure. At
a spectral efficiency of 3/2 bits/s/Hz and to achieve a symbol error rate of
10^-6, the modulation format obtained for optimizing the average electrical
power offers a 0.58 dB average electrical power gain over the best
lattice-based modulation and 2.55 dB gain over the best previously known
format. However, the modulation format optimized for average optical power
offers a 0.46 dB average optical power gain over the best lattice-based
modulation and 1.35 dB gain over the best previously known format.Comment: Submitted to Globecom 201
Calculation of Mutual Information for Partially Coherent Gaussian Channels with Applications to Fiber Optics
The mutual information between a complex-valued channel input and its
complex-valued output is decomposed into four parts based on polar coordinates:
an amplitude term, a phase term, and two mixed terms. Numerical results for the
additive white Gaussian noise (AWGN) channel with various inputs show that, at
high signal-to-noise ratio (SNR), the amplitude and phase terms dominate the
mixed terms. For the AWGN channel with a Gaussian input, analytical expressions
are derived for high SNR. The decomposition method is applied to partially
coherent channels and a property of such channels called "spectral loss" is
developed. Spectral loss occurs in nonlinear fiber-optic channels and it may be
one effect that needs to be taken into account to explain the behavior of the
capacity of nonlinear fiber-optic channels presented in recent studies.Comment: 30 pages, 9 figures, accepted for publication in IEEE Transactions on
Information Theor
The GMRT EoR Experiment: Limits on Polarized Sky Brightness at 150 MHz
The GMRT reionization effort aims to map out the large scale structure of the
Universe during the epoch of reionization (EoR). Removal of polarized Galactic
emission is a difficult part of any 21 cm EoR program, and we present new upper
limits to diffuse polarized foregrounds at 150 MHz. We find no high
significance evidence of polarized emission in our observed field at mid
galactic latitude (J2000 08h26m+26). We find an upper limit on the
2-dimensional angular power spectrum of diffuse polarized foregrounds of [l^2
C_l/(2 PI)]^{1/2}< 3K in frequency bins of width 1 MHz at 300<l<1000. The
3-dimensional power spectrum of polarized emission, which is most directly
relevant to EoR observations, is [k^3 P_p(k)/(2 PI^2)]^{1/2}
0.03 h/Mpc, k < 0.1 h/Mpc. This can be compared to the expected EoR signal in
total intensity of [k^3 P(k)/ (2 PI^2) ]^{1/2} ~ 10 mK. We find polarized
structure is substantially weaker than suggested by extrapolation from higher
frequency observations, so the new low upper limits reported here reduce the
anticipated impact of these foregrounds on EoR experiments. We discuss Faraday
beam and depth depolarization models and compare predictions of these models to
our data. We report on a new technique for polarization calibration using
pulsars, as well as a new technique to remove broadband radio frequency
interference. Our data indicate that, on the edges of the main beam at GMRT,
polarization squint creates ~ 3% leakage of unpolarized power into polarized
maps at zero rotation measure. Ionospheric rotation was largely stable during
these solar minimum night time observations.Comment: 17 pages, 6 figures, 2 tables; changed figures, added appendices. To
appear in MNRA
Deep Learning Framework for Wireless Systems: Applications to Optical Wireless Communications
Optical wireless communication (OWC) is a promising technology for future
wireless communications owing to its potentials for cost-effective network
deployment and high data rate. There are several implementation issues in the
OWC which have not been encountered in radio frequency wireless communications.
First, practical OWC transmitters need an illumination control on color,
intensity, and luminance, etc., which poses complicated modulation design
challenges. Furthermore, signal-dependent properties of optical channels raise
non-trivial challenges both in modulation and demodulation of the optical
signals. To tackle such difficulties, deep learning (DL) technologies can be
applied for optical wireless transceiver design. This article addresses recent
efforts on DL-based OWC system designs. A DL framework for emerging image
sensor communication is proposed and its feasibility is verified by simulation.
Finally, technical challenges and implementation issues for the DL-based
optical wireless technology are discussed.Comment: To appear in IEEE Communications Magazine, Special Issue on
Applications of Artificial Intelligence in Wireless Communication
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