| Against the back-cloth of the explosive expansion of the Internet and the continued dramatic increase in demand for high-speed multimedia wireless services, there is an urging demand for exible, broadband transceivers. A versatile broadband multiple access scheme, combining frequency-hopping (FH) with multicarrier DSCDMA (FH/MC DS-CDMA) is proposed and investigated. The FH/MC DS-CDMA scheme i...

In this letter, we propose a novel adaptive reducedrank strategy based on joint iterative optimization (JIO) of filters according to the minimization of the bit error rate (BER) cost function. The proposed optimization technique adjusts the weights of a subspace projection matrix and a reduced-rank filter jointly. We develop stochastic gradient (SG) algorithms for their adaptive implementation ...

Currently a lot of research work is carried on use of multirate digital filters and filter banks for implementation of multicarrier techniques to support high data rate transmission. The filter banks provide an alternate to DFT/IDFT processing. This is computationally efficient and lesser complex method of implementation. In this paper we derived the filterbank transmitter structure for MC-DSCD...

Adaptive deterministic blind symbol estimation algorithms for direct-sequence code-division multiple-access (DSCDMA) wireless communication are presented. We consider a subspace and an equalizer-based approach as well as the relation between both approaches. Both Viterbi and recursive least-squares (RLS) decoding schemes are studied. Simulation results show that these adaptive processing algori...

| The combination of continuous phase modulation (CPM) with direct-sequence code-division multiple access (DS-CDMA) for multiuser transmission over the additive white Gaussian noise channel is discussed. Concentrating on the important special case of generalized minimum-shift keying, particularly simple receiver structures are obtained. To emphasize on low complexity, noncoherent reception is p...

A new channel interleaving method, called chip interleaving, for direct sequence code division multiple access (DS-CDMA) mobile radio is proposed. Chip interleaver scrambles the chips and transforms the transmission channel into a highly time-selective or highly memoryless channel. It was found that the turbo decoding performance which degrades in a fading channel is significantly improved with...

The problem of closely-spaced paths in DSCDMA systems is a challenging task at the baseband receiver for applications such as mobile location and Rake receivers. Recently, we introduced a method based on Teager-Kaiser (TK) operator for resolving paths spaced at less than one chip distance. In this paper we compare the performance of TK operator with that of the subspace based MUSIC (Multiple Si...

Vehicle-to-vehicle radio links suffer from power variations, multipath fading and associated Doppler spreading in frequency, as well as interference form other vehicles. These effects are investigated in the context of an Automated Vehicle Control Systems (AVCS) employing vehicle platoons. A statistical model for the channel is considered and the performance of the network involving many links ...

Transmitter power control is a necessity to combat "near-far" problems in radio systems using receivers with limited "dynamic range" (such as conventional DSCDMA systems). Transmitter power control, however, can also be used to control cochannel interference, i.e. interference from other users using the same channel (code or time slot). For this purpose, it has been shown that the optimum trans...

Commercial cellular networks, like the systems based on DS-CDMA, face many types of interferences such as multi-user interference inside each sector in a cell to interoperate interference. Independent Component Analysis (ICA) has been used as an advanced preprocessing tool for blind suppression of interfering signals in DS-CDMA communication systems. The role of ICA is to provide an interferenc...