Subband IPNLMS for blind adaptive MIMO filtering with sparse impulse response systems

Subband adaptive convex combination of two NLMS based filters for sparse impulse response systems

“…These characteristics lead to degraded performance of adaptive filter employing NLMS [1]. Improved proportionate NLMS (IPNLMS) and subband adaptive filtering (SAF) may solve the above problems [2][3][4][5]. Sparse impulse response system like as an acoustic channel has a small percentage of its components with significant magnitude, while the rest has nearly zero or small magnitude.…”

“…Furthermore, in the real applications which require long length filter, the use of polyphase decomposition, noble identity and decimation lead to fast convergence rate because adaptive sub-filters in each subband have reduced filter length than full band case [4,5]. Recently, a combination schemes receive attention in adaptive filter applications [6][7][8].…”