Author: 楊佳諭Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Adaptive Receivers for DS/CDMA Multiuser Communication in Multipath Fading Channels
Author: 楊佳諭Adaptive Receivers for DS/CDMA Multiuser Communication in Multipath Fading Channels
Author: Blind Adaptive DS/CDMA Receivers in Multipath Fading Channels
Author: 陳柏羽Estimation of Fading Channel in DS-Cdma Multiuser Communications Systems
Author: Chun-Yu FungPublisher: Open Dissertation Press
ISBN: 9781374709430
Category :
Languages : en
Pages :
Book Description
This dissertation, "Estimation of Fading Channel in DS-CDMA Multiuser Communications Systems" by Chun-yu, Fung, 馮震宇, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of the Thesis Entitled Estimation of Fading Channel in DS-CDMA Multiuser Communications Systems submitted by Fung Chun Yu for the degree of Master of Philosophy at the University of Hong Kong in December 2002 Multipath fading and multiuser access interference are two major impairments in direct-sequence code-division multiple-access (DS-CDMA) systems. Efficient channel estimation and multiuser detection techniques play important roles in overcoming these deficiencies. This thesis is concerned with the design of a space-time (ST) blind adaptive receiver for DS-CDMA systems and the accompanied channel estimation algorithm. A new space-time decorrelating RAKE (ST-DRAKE) receiver is developed for blind reception of CDMA signals in frequency-selective fading channels. It has the advantage that only the knowledge of the desired user's signature waveform is required and therefore no transmission of training sequence is needed. The ST-DRAKE receiver consists of two parts. The first part is a set of constrained adaptive filters that are designed to suppress interference based on the minimum output energy criterion. These filters are implemented in a structure analogous to the general sidelobe canceller in array processing, which is implemented by a multistage Weiner filter is employed to reduce the complexity of the receiver. The second part of the ST-DRAKE receiver coherently combines the outputs of the constrained adaptive filters and gives an estimate of the transmitted signal. Simulation results show that the ST- DRAKE delivers significant performance improvement by exploiting the spatial diversity of the antenna array. The problem of estimating fast fading channels in the proposed receiver is also addressed. The time-varying channel is modeled as an autoregressive process and the Kalman filter is employed to estimate the time-varying channel coefficients. A robust Kalman filter based on the M-estimate cost function is also developed to suppress impulsive noise present in the received signals. Simulation results show that the Kalman filter provides more accurate channel estimate to the ST-DRAKE than using the decomposition method. Simulation results also show that the coupled receiver has a performance comparable to the optimum minimum mean-squared error receiver with known channel information. DOI: 10.5353/th_b2750902 Subjects: Code division multiple access Wireless communication systems
Adaptive Decision-feedback Multiuser Detection for DS-CDMA Systems
Author: Min LiA Subspace-based Blind Adaptive RAKE Receiver for DS-CDMA in Multipath Fading Channels
Author: Rajendra R. KoppulaPublisher:
ISBN:
Category : Code division multiple access
Languages : en
Pages : 196
Book Description
The Performance of Matched-filter and MMSE Receivers for DS-CDMA Systems in Multipath Fading Channels
Author: Jeffrey Ronald FoersterPublisher:
ISBN:
Category :
Languages : en
Pages : 330
Book Description
Adaptive Receivers for Multirate DS/CDMA Systems Over Frequency-selective Fading Channels
Author: Antonio PauciulloAdaptive Receivers for OFDM-CDMA Communication Systems in Multipath Fading Channels
Author: 蘇嫻Adaptive Signal Processing in Wireless Communications
Author: Mohamed IbnkahlaPublisher: CRC Press
ISBN: 1420046020
Category : Technology & Engineering
Languages : en
Pages : 520
Book Description
Adaptive techniques play a key role in modern wireless communication systems. The concept of adaptation is emphasized in the Adaptation in Wireless Communications Series through a unified framework across all layers of the wireless protocol stack ranging from the physical layer to the application layer, and from cellular systems to next-generation wireless networks. This specific volume, Adaptive Signal Processing in Wireless Communications is devoted to adaptation in the physical layer. It gives an in-depth survey of adaptive signal processing techniques used in current and future generations of wireless communication systems. Featuring the work of leading international experts, it covers adaptive channel modeling, identification and equalization, adaptive modulation and coding, adaptive multiple-input-multiple-output (MIMO) systems, and cooperative diversity. It also addresses other important aspects of adaptation in wireless communications such as hardware implementation, reconfigurable processing, and cognitive radio. A second volume in the series, Adaptation and Cross-layer Design in Wireless Networks(cat no.46039) is devoted to adaptation in the data link, network, and application layers.