Selective Multipath Interference Canceller with Linear Equalization for DS-UWB Systems with Low Spreading Factor

TL;DR

This paper introduces SMPIC-LE, a novel interference cancellation method for high-rate DS-UWB systems with low spreading factors, improving interference mitigation and computational efficiency.

Contribution

The paper proposes SMPIC-LE, a new iterative interference canceller with linear equalization that outperforms traditional RAKE-DFE in multipath interference mitigation.

Findings

SMPIC-LE effectively mitigates multipath interference.

It offers better performance and lower complexity than RAKE-DFE.

Approaches the matched filter bound with increased RAKE fingers.

Abstract

In high rate DS-UWB systems with low spreading factor, the selective multipath interference canceller with linear equalization (SMPIC-LE) is developed to alleviate severe multipath interferences induced by the poor orthogonality of spreading codes. The SMPIC iteratively mitigates the strongest inter-path interference, inter-chip interference and inter-symbol interference, while the former two are unresolvable in conventional RAKE-decision feedback equalizer (DFE) receivers. The numerical results and complexity analysis demonstrate that SMPIC-LE with proper parameters provides an attractive overall advantage in performance and computational complexity compared with RAKE-DFE. In addition, it approaches the matched filter bound well as the RAKE finger in SMPIC increases.