Subband array implementations for space-time adaptive processing

Authors:
Yimin Zhang;Kehu Yang;Moeness G. Amin
Affiliations:
Center for Advanced Communications, Villanova University, Villanova, PA;Electronic Engineering Research Institute, School of Electronic Engineering, Xidian University, Xi'an, Shaanxi, China;Center for Advanced Communications, Villanova University, Villanova, PA
Venue:
EURASIP Journal on Applied Signal Processing
Year:
2005

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Abstract

Intersymbol interference (ISI) and cochannel interference (CCI) are two primary sources of signal impairment in mobile communications. In order to suppress both ISI and CCI, space-time adaptive processing (STAP) has been shown to be effective in performing spatio-temporal equalization, leading to increased communication capacity as well as improved quality of service. The high complexity and slow convergence, however, often impede practical STAP implementations. Several subband array structures have been proposed as alternatives to STAP. These structures provide optimal or suboptimal steady-state performance with reduced implementation complexity and improved convergence performance. The purpose of this paper is to investigate the steady-state performance of subband arrays with centralized and localized feedback schemes, using different decimation rates. Analytical expressions of the minimum mean-square error (MMSE) performance are derived. The analysis assumes discrete Fourier transform (DFT)-based subband arrays and considers both unconstrained and constrained weight adaptations.