Summary
International Symposium on Nonlinear Theory and its Applications
2017
Session Number:A3L-A
Session:
Number:A3L-A-7
Stabilized Interference Suppression by Initial Antenna Selection for CMA Adaptive Array Over Rayleigh Fading Channels
Kazuki Maruta, Chang-Jun Ahn, Ken-Ya Hashimoto,
pp.217-220
Publication Date:2017/12/4
Online ISSN:2188-5079
Summary:
This paper proposes an antenna selective constant modulus algorithm (ASCMA) to stabilize CMA's prominent interference suppression performance. CMA is well known blind adaptive array scheme, but it cannot suppress the interference when signal-to-interference power ratio (SIR) is smaller than 0 dB. It faces strong limits on their applicable region over Rayleigh fading channels where instantaneous channel gain fluctuates over 10 dB range. Even if the expected desired signal strength is larger than interference, CMA may still miscapture the interference and incorrectly suppress the desired signal. Our proposal is simplified approach to select the antenna element whose reception power is maximal.Certain antenna element can be expected to capture the desired signal precisely under the condition where SIR is statistically positive, so that the CMA processor can utilize it as an initial input.This condition will be ensured by increasing antenna element number, supported by the trends that base station antenna elements are going massive.Computer simulations verifies improved interference suppression performance provided by the proposed scheme.