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— Direct-sequence/code-division multiple-access (DS/CDMA) communication systems equipped with adaptive antenna arrays offer the opportunity for jointly effective spatial and temporal (code) multiple-access interference (MAI) and channel noise suppression. This work focuses on the development of fast joint space–time (S–T) adaptive optimization procedures(More)
In this paper we propose two data-record based criteria for the selection of an auxiliary-vector (AV) estima-tor from the sequence of AV estimators of the MVDR jilter. The first criterion m k m i z e s the estimated J-aliuergence of the bit-conditioned AVfilter-output distributions , while the second criterion minimizes the cross-clalidated sample average(More)
In this work, a cognitive cooperative communication protocol is proposed for cognitive ad-hoc networks, in which primary users and cognitive radio (CR) users may cooperate for mutual benefit. The new cooperation protocol allows active cooperation between primary users and CR users in which CR users assist to relay primary users' signals in exchange for some(More)
—Receiver architectures in the form of a linear filter front-end followed by a hard-limiting decision maker are considered for DS-CDMA communication systems. Based on stochastic approximation concepts a recursive algorithm is developed for the adaptive optimization of the linear filter front-end in the minimum BER sense. The recursive form is decision(More)
In this paper, we consider a heterogeneous ad-hoc network where primary users may cooperate with cognitive radio (CR) users for the transmission of their data. We propose a new cooperation protocol that allows CR users to relay primary user signals in exchange for some spectrum. The spectrum released by primary users is used by CR users for their own data(More)
— We present a necessary and sufficient condition for any orthogonal space-time block code (STBC) to allow transceiver signal linearization (as in the well-known case of the Alamouti scheme). Then, we show that all square orthogonal STBC's that satisfy the condition have rate that goes to zero linearly with the number of transmit antennas. Hence,(More)
— ¡ The problem under consideration is the adaptive reception ¢ of a multipath direct-sequence spread-spectrum (SS) signal in the presence of unknown correlated SS interference and ad-diti £ ve impulsive noise. An SS receiver structure is proposed that consists ¢ of a vector of adaptive chip-based Hampel nonlinearities f ¤ ollowed by an adaptive(More)
— We consider the problem of robust detection of a spread-spectrum (SS) signal in the presence of unknown correlated SS interference and additive non-Gaussian noise. The proposed general SS receiver structure is comprised by a vector of adaptive chip-based nonlinearities followed by an adaptive linear tap-weight filter and combines the relative merits of(More)