81 citations · 228 across the 11 of their papers we have counts for
11 papers · 1 filter
Hybrid Analog and Digital Precoding: From Practical RF System Models to Information Theoretic Bounds
Vijay Venkateswaran, Rajet Krishnan
Hybrid analog-digital precoding is a key millimeter wave access technology, where an antenna array with reduced number of radio frequency (RF) chains is used with an RF precoding m…
Receiver Algorithm based on Differential Signaling for SIMO Phase Noise Channels with Common and Separate Oscillator Configurations
M. Reza Khanzadi, Rajet Krishnan, Thomas Eriksson
In this paper, a receiver algorithm consisting of differential transmission and a two-stage detection for a single-input multiple-output (SIMO) phase-noise channels is studied. Spe…
On the Capacity of the Wiener Phase-Noise Channel: Bounds and Capacity Achieving Distributions
M. Reza Khanzadi, Rajet Krishnan, Johan Söder +1
In this paper, the capacity of the additive white Gaussian noise (AWGN) channel, affected by time-varying Wiener phase noise is investigated. Tight upper and lower bounds on the ca…
Linear Massive MIMO Precoders in the Presence of Phase Noise -- A Large-Scale Analysis
R. Krishnan, M. R. Khanzadi, N. Krishnan +4
We study the impact of phase noise on the downlink performance of a multi-user multiple-input multiple-output system, where the base station (BS) employs a large number of transmit…
Effect of Synchronizing Coordinated Base Stations on Phase Noise Estimation
M. Reza Khanzadi, Rajet Krishnan, Thomas Eriksson
In this paper, we study the problem of oscillator phase noise (PN) estimation in coordinated multi-point (CoMP) transmission systems. Specifically, we investigate the effect of pha…
Estimation of phase noise in oscillators with colored noise sources
M. Reza Khanzadi, Rajet Krishnan, Thomas Eriksson
In this letter we study the design of algorithms for estimation of phase noise (PN) with colored noise sources. A soft-input maximum a posteriori PN estimator and a modified soft-i…
Oscillator Phase Noise and Small-Scale Channel Fading in Higher Frequency Bands
M. Reza Khanzadi, Rajet Krishnan, Dan Kuylenstierna +1
This paper investigates the effect of oscillator phase noise and channel variations due to fading on the performance of communication systems at frequency bands higher than 10GHz.…
On the Impact of Oscillator Phase Noise on the Uplink Performance in a Massive MIMO-OFDM System
Rajet Krishnan, M. Reza Khanzadi, N. Krishnan +4
In this work we study the effect of oscillator phase noise on the uplink performance of a massive multiple-input multiple output system. Specifically, we consider an orthogonal fre…
Algorithms for Joint Phase Estimation and Decoding for MIMO Systems in the Presence of Phase Noise
Rajet Krishnan, Giulio Colavolpe, Alexandre Graell i Amat +1
In this work, we derive the maximum a posteriori (MAP) symbol detector for a multiple-input multiple-output system in the presence of Wiener phase noise due to noisy local oscillat…
Soft metrics and their Performance Analysis for Optimal Data Detection in the Presence of Strong Oscillator Phase Noise
Rajet Krishnan, M. Reza Khanzadi, Thomas Eriksson +1
In this paper, we address the classical problem of maximum-likelihood (ML) detection of data in the presence of random phase noise. We consider a system, where the random phase noi…
Constellation Optimization in the Presence of Strong Phase Noise
Rajet Krishnan, Alexandre Graell i Amat, Thomas Eriksson +1
In this paper, we address the problem of optimizing signal constellations for strong phase noise. The problem is investigated by considering three optimization formulations, which…