New linear PIC detectors based on non-monotone line-search techniques

Competitive linear parallel interference cancellation detection based on monotone line‐search techniques

“…which are nothing but the weighting factors of the previous www.ietdl.org stage of the LPIC detector using the steepest descent (SD)/ minimal gradient (MG) methods, that is, v SD p−1 and v MG p−1 , respectively. This leads to the conclusion that the BB algorithm exhibits almost the same computational complexity and memory requirements as the SD/MG method, however, in terms of the convergence speed, it outperforms the SD/MG method considerably as demonstrated in the simulation section in [1]. The BB method is globally convergent if ICI matrix is positive semi-definite [14].…”

“…Based on [1], the best performing non-monotone line-search techniques in terms of convergence speed are the cyclic minimal gradient (MGcyclic) and the alternating BB (ABB) methods.…”

“…Jacobi Preconditioned versions of the update equations above have been presented in [1] to deal with the ill-conditioned wireless fading channel. We will not detail their update equations in this paper, instead we refer interested readers to [1] and references therein.…”

“…The dimensions [1] of future technologies in wireless as well as wired communication systems are scaling up and consequently advanced estimation and detection algorithms with low complexity need to be developed to cope with these technologies (see e.g. massive multiple-input-multiple-output (MIMO) technology in [2]).…”

“…For example, a user moving at 64 km/h will yield a Doppler shift of approximately 308 Hz, which corresponds to roughly 2.7% of the subcarrier spacing [10]. Within the context of combating ICI in OFDMA systems, we assess the performance of two new LPIC detectors that are based on monotone line search techniques described in [8][9] and we compare their performance to the LPIC detectors based on non-monotone line search techniques proposed recently in [1].…”