Redundant Residue Number System Assisted Multicarrier Direct-Sequence Code-Division Dynamic Multiple Access for Cognitive Radios

A redundant residue number system (RRNS)-assisted multicarrier direct-sequence code-division dynamic multiple-access (MC/DS-CDDMA) scheme is proposed for application in cognitive radios (CRs). Taking the advantages of both multicarrier direct-sequence code-division multiple access and RRNS, the RRNS...

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Bibliographic Details
Published in:IEEE transactions on vehicular technology Vol. 61; no. 3; pp. 1234 - 1250
Main Authors: Zhang, Shuo, Yang, Lie-Liang, Zhang, Youguang
Format: Journal Article
Language:English
Published: New York, NY IEEE 01.03.2012
Institute of Electrical and Electronics Engineers
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Applied sciences
Code-division multiple access
cognitive radios (CRs)
Decoding
Detection, estimation, filtering, equalization, prediction
dynamic multiple access (DMA)
Dynamical systems
Dynamics
Educational institutions
Exact sciences and technology
Fading
Information, signal and communications theory
Mean square errors
Mud
Multiaccess communication
multicarrier modulation
Multiple access
Multiuser detection
multiuser detection (MUD)
Radio
Radiocommunication specific techniques
Radiocommunications
Receivers
Redundant
redundant residue number system (RRNS)
residue number system (RNS)
Residue number systems
Signal and communications theory
Signal, noise
Subcarriers
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Throughput
Transmission and modulation (techniques and equipments)
Transmitters. Receivers
Parameter estimation
Redundant system
Current source converter
Subcarrier
Flexibility
Implementation
multiuser detection (MUD)
Mean square error
redundant residue number system (RRNS)
Channel estimation
dynamic multiple access (DMA)
Reconfigurable architectures
Direct sequence
multicarrier modulation
Multistage circuit
Signal detection
Multiuser detection
Multiple access
Multistage method
Multicarrier
Residue number systems
Receiver
Information transmission
cognitive radios (CRs)
Joint detection
residue number system (RNS)
Code-division multiple access
Code division multiple access
Autocorrelation
Software radio
ISSN:0018-9545, 1939-9359
Online Access:Get full text
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Summary:A redundant residue number system (RRNS)-assisted multicarrier direct-sequence code-division dynamic multiple-access (MC/DS-CDDMA) scheme is proposed for application in cognitive radios (CRs). Taking the advantages of both multicarrier direct-sequence code-division multiple access and RRNS, the RRNS MC/DS-CDDMA has a low complexity for implementation and a high flexibility for reconfiguration and is robust to dynamic spectrums. Associated with the RRNS MC/DS-CDDMA, in this paper, the so-called receiver multiuser diversity aided multistage minimum mean-square error multiuser detector (RMD/MS-MMSE MUD) is considered for signal detection. Specifically, three types of RMD/MS-MMSE MUDs are proposed: Type-I.1, Type-II.1, and Type-I.2 RMD/MS-MMSE MUDs. In these MUD schemes, the Type-I.1 MUD carries out the joint detection of all the subcarrier signals using both the observations and the channel state information (CSI) of all the subcarriers. In the Type-I.2 and Type-II.1 RMD/MS-MMSE MUDs, the embedded MMSE-MUDs are implemented subcarrier by subcarrier independently. Furthermore, in the Type-I.2 RMD/MS-MMSE MUD, the autocorrelation matrices used by the MMSE-MUDs are free from CSI. Explicitly, both Type-II.1 and Type-I.2 RMD/MS-MMSE MUDs are suitable for operation in dynamic spectrum environments. Furthermore, our simulation results show that the preceding three types of RMD/MS-MMSE MUDs are capable of making the RRNS MC/DS-CDDMA systems achieve similar error and throughput performance. Owing to the foregoing merits, the RRNS MC/DS-CDDMA employing either Type-I.2 or Type-II.1 RMD/MS-MMSE MUD may be considered one of the highly promising dynamic multiple-access schemes for application in CR systems.
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ISSN:0018-9545
1939-9359
DOI:10.1109/TVT.2012.2184146