Fast Detection of Orthogonal Space-Time Block Codes with Unknown Channel

TL;DR

This paper presents a low-complexity blind detection algorithm for orthogonal space-time block codes in MIMO systems, improving detection accuracy without requiring channel state information, and approaches optimal performance.

Contribution

Introduction of an enhanced iterative least-squares algorithm for blind OSTBC detection that improves accuracy over basic methods.

Findings

E-ILS algorithm achieves near-optimal detection performance.

Proposed method has low computational complexity.

Simulation results confirm effectiveness in Rayleigh fading channels.

Abstract

This letter investigates the problem of blind detection of orthogonal space-time block codes (OSTBC) over a quasi-static flat multiple-input multiple-output (MIMO) Rayleigh fading channel. We first introduce a core iterative least-squares (ILS) algorithm to blindly detect OSTBC signals without the knowledge of channel state information (SCI) at the receiver. This ILS algorithm has low computational complexity but may converge to local optimum which offers unreliable detection result. Then, in order to improve the detection performance, we propose an enhanced ILS (E-ILS) approach which is based on statistical analysis of repeated independent ILS procedures on received data. Extensive simulation studies prove the efficiency of the proposed E-ILS algorithm with blind detection performance approaching the optimal maximum-likelihood detector with known CSI.