376 citations · 2.9k across the 110 of their papers we have counts for
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High-SNR Asymptotics of Mutual Information for Discrete Constellations with Applications to BICM
Alex Alvarado, Fredrik Brannstrom, Erik Agrell +1
Asymptotic expressions of the mutual information between any discrete input and the corresponding output of the scalar additive white Gaussian noise channel are presented in the li…
General BER Expression for One-Dimensional Constellations
Mikhail Ivanov, Fredrik Brännström, Alex Alvarado +1
A novel general ready-to-use bit-error rate (BER) expression for one-dimensional constellations is developed. The BER analysis is performed for bit patterns that form a labeling. T…
On Optimal TCM Encoders
Alex Alvarado, Alexandre Graell i Amat, Fredrik Brannstrom +1
An asymptotically optimal trellis-coded modulation (TCM) encoder requires the joint design of the encoder and the binary labeling of the constellation. Since analytical approaches…
Design of APSK Constellations for Coherent Optical Channels with Nonlinear Phase Noise
Christian Häger, Alexandre Graell i Amat, Alex Alvarado +1
We study the design of amplitude phase-shift keying (APSK) constellations for a coherent fiber-optical communication system where nonlinear phase noise (NLPN) is the main system im…
On the Exact BER of Bit-Wise Demodulators for One-Dimensional Constellations
Mikhail Ivanov, Fredrik Brannstrom, Alex Alvarado +1
The optimal bit-wise demodulator for M-ary pulse amplitude modulation (PAM) over the additive white Gaussian noise channel is analyzed in terms of uncoded bit-error rate (BER). New…
An Efficient Algorithm to Calculate BICM Capacity
Georg Böcherer, Fabian Altenbach, Alex Alvarado +2
Bit-interleaved coded modulation (BICM) is a practical approach for reliable communication over the AWGN channel in the bandwidth limited regime. For a signal point constellation w…
Signal Shaping for BICM at Low SNR
Erik Agrell, Alex Alvarado
The mutual information of bit-interleaved coded modulation (BICM) systems, sometimes called the BICM capacity, is investigated at low signal-to-noise ratio (SNR), i.e., in the wide…