WSEAS Transactions on Signal Processing
Print ISSN: 1790-5052, E-ISSN: 2224-3488
Volume 8, 2012
Signal Detection for OFDM and DS-CDMA with Gradient and Blind Source Separation Principles
Authors: , ,
Abstract: Signal recovery mechanisms for both Orthogonal Frequency Division Multiplexing (OFDM) and Direct Sequence - Code Division Multiple Access (DS-CDMA) with the assistance of principles of Blind Source Separation (BSS) and Gradient Algorithms (GAs) are presented. Elimination or reduction of undesirable influences encountered with in the wireless interface is targeted using a set of filter coefficients. Four energy functions are used in deriving them. Time correlation properties of the channel are used as advantages in introducing the energy functions and they are tried to be justified followed by a performance evaluation. All the schemes are tested with synchronous downlink system models. Simulations are carried out under slow fading channel conditions with a receiver containing Equal Gain Combining (EGC) and BSS algorithms. It could be noted that, better performance for this predominant air interface communication techniques can be achieved with this combined schemes. It is important grasp the fact that, these schemes can be promoted as low complexity simple matrices based processing mechanisms.