Several multiuser detectors for Code-Division Multiple-Access(CDMA) system have be'n studied recently. In this paper we propose the orthogonal decision-feedback detector. It combines the decorrelating decisionfeed...Several multiuser detectors for Code-Division Multiple-Access(CDMA) system have be'n studied recently. In this paper we propose the orthogonal decision-feedback detector. It combines the decorrelating decisionfeedback detector with the orthogonal detector, and has the merit of good performance of the decorrelating decisionfeedback detector and simple structure of the orthogonal detector The performance of the new multiuser detector is close to the decorrelating decision-feedback detector but its construction is simpler. Because of the similarities betWeen the multiuser detection problem and the decoding of the convolutional code, a tree search algorithm is taken on the detector which makes its performance improved. and approaches the single user bound.展开更多
A new Distributed Dynamic Channel Allocation (DDCA) algorithm named Combined DDCA is proposed in this paper.In this algorithm, each base station selects channels by learning through past experience of channel usag...A new Distributed Dynamic Channel Allocation (DDCA) algorithm named Combined DDCA is proposed in this paper.In this algorithm, each base station selects channels by learning through past experience of channel usage together with CIR measurement. Computer simulations are used to evaluate system performances. Performances are evaluated in two criteria, blocking probability and interaction probability. Comparisons with other DDCA algorithms have been carried out to validate the proposed algorithm.展开更多
In this paper, we propose a multistage Volterra filter and show it is equivalent to the partially decoupled Volterra per as formulated in [1]. Using this approach. we may readily derive a partially decoupled parallel ...In this paper, we propose a multistage Volterra filter and show it is equivalent to the partially decoupled Volterra per as formulated in [1]. Using this approach. we may readily derive a partially decoupled parallel algorithm for adaptation of filter's coefficients and upper bounds for each of the step sizes. The approach greatly simplifies the derivation given in [1].展开更多
This paper deals with noncoherent Maximum-likelihood Block Detection (MLBD) of uncodedCPM signals (full response CPM and parrtal response CPM) over an additive white noise (AWGN)channel. Based on the work of W. Osborn...This paper deals with noncoherent Maximum-likelihood Block Detection (MLBD) of uncodedCPM signals (full response CPM and parrtal response CPM) over an additive white noise (AWGN)channel. Based on the work of W. Osborne and M. Simon ,this paper generalizes Maximum-likelihoodBlork Detection. Then we focus on the error performance of MLBD, which is named one-symbol MLBDand N-symbol MLBD respectively. By computer simulation of CPFSK, 1RC and 2RC , it is found thatMLBD can improve the error performance over traditional noncoherent detection.展开更多
文摘Several multiuser detectors for Code-Division Multiple-Access(CDMA) system have be'n studied recently. In this paper we propose the orthogonal decision-feedback detector. It combines the decorrelating decisionfeedback detector with the orthogonal detector, and has the merit of good performance of the decorrelating decisionfeedback detector and simple structure of the orthogonal detector The performance of the new multiuser detector is close to the decorrelating decision-feedback detector but its construction is simpler. Because of the similarities betWeen the multiuser detection problem and the decoding of the convolutional code, a tree search algorithm is taken on the detector which makes its performance improved. and approaches the single user bound.
文摘A new Distributed Dynamic Channel Allocation (DDCA) algorithm named Combined DDCA is proposed in this paper.In this algorithm, each base station selects channels by learning through past experience of channel usage together with CIR measurement. Computer simulations are used to evaluate system performances. Performances are evaluated in two criteria, blocking probability and interaction probability. Comparisons with other DDCA algorithms have been carried out to validate the proposed algorithm.
文摘In this paper, we propose a multistage Volterra filter and show it is equivalent to the partially decoupled Volterra per as formulated in [1]. Using this approach. we may readily derive a partially decoupled parallel algorithm for adaptation of filter's coefficients and upper bounds for each of the step sizes. The approach greatly simplifies the derivation given in [1].
文摘This paper deals with noncoherent Maximum-likelihood Block Detection (MLBD) of uncodedCPM signals (full response CPM and parrtal response CPM) over an additive white noise (AWGN)channel. Based on the work of W. Osborne and M. Simon ,this paper generalizes Maximum-likelihoodBlork Detection. Then we focus on the error performance of MLBD, which is named one-symbol MLBDand N-symbol MLBD respectively. By computer simulation of CPFSK, 1RC and 2RC , it is found thatMLBD can improve the error performance over traditional noncoherent detection.
