Proceedings ArticleDOI
A Novel Architecture of Single-Carrier Block Transmission DS-CDMA
Ming-Xian Chang,Chouchang Yang +1 more
- pp 1-5
TLDR
A new signal model is derived that represents spreading, channel effect, and despreading as a series of circular convolutions that helps in deriving a new frequency-domain minimum mean-square error (MMSE) equalization algorithm for SC block transmission CDMA.Abstract:
Single-carrier (SC) block transmission [1][2] is an efficient scheme in multipath channels. With frequency-domain equalization, SC block transmission avoids complex time-domain equalization. There are also several systems proposed that combine SC-FDE with code-division multiple access (CDMA). However, unlike conventional direct-sequence (DS) CDMA, the present CDMA systems with FDE may be not suitable for asynchronous users, for lack of a signal model that could suitably express the despread signal in frequency domain. In this paper, we propose a novel architecture of SC block transmission DS-CDMA that can be applied for asynchronous users. A new signal model is derived that represents spreading, channel effect, and despreading as a series of circular convolutions. This signal model helps in deriving a new frequency-domain minimum mean-square error (MMSE) equalization algorithm for SC block transmission CDMA. Based on the proposed signal model, we also propose a simple channel estimation algorithm. Our architecture and signal model can be applied for further development of multi-user detection algorithms.read more
Citations
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Proceedings ArticleDOI
Adaptive linear interference suppression based on block conjugate gradient method in frequency domain for DS-UWB systems
Sheng Li,Rodrigo C. de Lamare +1 more
TL;DR: An adaptive linear interference suppression scheme based on single-carrier frequency domain equalization (SC-FDE) for multiuser direct-sequence ultra-wideband (DS-UWB) systems is proposed and an adaptive block conjugate gradient (BCG) algorithm is developed.
Dissertation
Adaptive interference suppression algorithms for DS-UWB systems
TL;DR: In this article, the authors investigated a generic reduced-rank scheme based on the concept of joint and iterative optimization (JIO) that jointly optimizes a projection vector and a reduced rank filter by using the minimum mean-squared error (MMSE) criterion.
Journal ArticleDOI
Frequency-domain adaptive detectors for single-carrier frequency-domain equalisation in multiuser direct-sequence ultra-wideband systems based on structured channel estimation and direct adaptation
Sheng Li,R.C. de Lamare +1 more
TL;DR: Two adaptive detection schemes based on single-carrier frequency-domain equalisation for multiuser direct-sequence ultra-wideband systems, which are termed structured channel estimation (SCE) and direct adaptation (DA), use the minimum mean square error (MMSE) linear detection strategy and employ a cyclic prefix.
Proceedings ArticleDOI
Adaptive Detector for SC-FDE in Multiuser DS-UWB Systems Based on Structured Channel Estimation with Conjugate Gradient Algorithm
Sheng Li,Rodrigo C. de Lamare +1 more
TL;DR: A conjugate gradient (CG) based structured channel estimation (SCE) scheme for single-carrier frequency domain equalization (SC-FDE) in multiuser direct-sequence ultra-wideband (DS-UWB) systems achieves a better tradeoff between the complexity and the performance.
Journal ArticleDOI
Adaptive Frequency-Domain Group-Based Shrinkage Estimators for UWB Systems
TL;DR: The proposed low-complexity adaptive biased estimation algorithms, called group-based shrinkage estimators (GSEs), for parameter estimation and interference suppression scenarios with mechanisms to automatically adjust the shrinkage factors are proposed.
References
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Book
Probability and Random Processes with Applications to Signal Processing
Henry Stark,John W. Woods +1 more
TL;DR: This chapter concludes with a Summary, Problems, and References of the Introduction to Probability, which explains the motivation for studying Probability and some useful classification of Random Processes.
Journal ArticleDOI
OFDM or single-carrier block transmissions?
TL;DR: This work compares two block transmission systems over frequency-selective fading channels: orthogonal frequency-division multiplexing (OFDM) versus single-carrier modulated blocks with zero padding (ZP), and establishes that unlike OFDM, uncoded block transmissions with ZP enjoy maximum diversity and coding gains within the class of linearly precodes block transmissions.
Journal ArticleDOI
Chip-interleaved block-spread code division multiple access
TL;DR: A novel multiuser-interference (MUI)-free code division multiple access (CDMA) transceiver for frequency-selective multipath channels is developed, relying on chip-interleaving and zero padded transmissions, which allows for perfectly constant modulus transmissions.
Proceedings ArticleDOI
Linearly precoded or coded OFDM against wireless channel fades
TL;DR: In this article, the maximum achievable diversity order for correlated Rayleigh fading channels and design rules for achieving maximum diversity gains with LP-OFDM were provided, and a simulated performance comparison with existing block and convolutionally coded OFDM alternatives was conducted in a HiperLan2 experiment.
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