Synthesized-Isotropic Narrowband Channel Parameter Extraction from Angle-Resolved Wideband Channel Measurements

TL;DR

This paper presents a new method for accurately extracting large-scale channel parameters from wideband angle-resolved measurements at millimeter-wave frequencies, addressing biases caused by non-orthogonal scan beams.

Contribution

It introduces a unified matrix formulation and a beam-accumulation correction factor to improve parameter extraction accuracy in wideband channel sounding.

Findings

Validated with simulations and 154 GHz measurements

Reduces bias in power estimates from non-orthogonal beams

Improves large-scale parameter extraction accuracy

Abstract

Angle-resolved channel sounding using antenna arrays or mechanically steered high-gain antennas is widely employed at millimeter-wave and terahertz bands. To extract antenna-independent large-scale channel parameters such as path loss, delay spread, and angular spread, the radiation-pattern effects embedded in the measured responses must be properly compensated. This paper revisits the technical challenges of path-gain calculation from angle-resolved wideband measurements, with emphasis on angular-domain power integration where the scan beams are inherently non-orthogonal and simple power summation leads to biased omni-equivalent power estimates. We first formulate the synthesized-isotropic narrowband power in a unified matrix form and introduce a beam-accumulation correction factor, including an offset-averaged variant to mitigate scalloping due to off-grid angles. The proposed framework is validated through simulations using channel models and 154~GHz corridor measurements.