Zero-forcing and minimum mean-square error multiuser detection in generalized multicarrier DS-CDMA systems for cognitive radio

Authors:
Lie-Liang Yang;Li-Chun Wang
Affiliations:
School of Electronics and Computer Science, University of Southampton, UK;Department of Communications Engineering, National Chiao Tung University, Hsinchu, Taiwan
Venue:
EURASIP Journal on Wireless Communications and Networking - Multicarrier Systems
Year:
2008

Citing 12
Cited 2

Multiuser Detection

Multiuser Detection
Wireless Communications Systems: Advanced Techniques for Signal Reception

Wireless Communications Systems: Advanced Techniques for Signal Reception
Performance of broadband multicarrier DS-CDMA using space-time spreading-assisted transmit diversity

IEEE Transactions on Wireless Communications
Space-time codes for high data rate wireless communication: performance criterion and code construction

IEEE Transactions on Information Theory
Software-defined-radio-assisted adaptive broadband frequency hopping multicarrier DS-CDMA

IEEE Communications Magazine
Multicarrier DS-CDMA: a multiple access scheme for ubiquitous broadband wireless communications

IEEE Communications Magazine
Limits on communications in a cognitive radio channel

IEEE Communications Magazine
The software radio architecture

IEEE Communications Magazine
Wideband CDMA network sensitivity function

IEEE Journal on Selected Areas in Communications
MMSE detection of multicarrier CDMA

IEEE Journal on Selected Areas in Communications
Cognitive radio: brain-empowered wireless communications

IEEE Journal on Selected Areas in Communications
On the performance of multicarrier DS-CDMA with imperfect power control and variable spreading factors

IEEE Journal on Selected Areas in Communications

A joint power control and interference avoidance code assignment strategy for downlink MC-DS-CDMA with 2D spreading

IEEE Transactions on Wireless Communications
Soft Decision Error Assisted Layered Multiuser Detectors for MIMO 2D Spread MC DS-CDMAs

Wireless Personal Communications: An International Journal

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Abstract

In wireless communications, multicarrier direct-sequence code-division multiple access (MC DS-CDMA) constitutes one of the highly flexible multiple access schemes. MC DS-CDMA employs a high number of degrees-of-freedom, which are beneficial to design and reconfiguration for communications in dynamic communications environments, such as in the cognitive radios. In this contribution, we consider the multiuser detection (MUD) in MC DS-CDMA, which motivates low complexity, high flexibility, and robustness so that the MUD schemes are suitable for deployment in dynamic communications environments. Specifically, a range of low-complexity MUDs are derived based on the zero-forcing (ZF), minimum mean-square error (MMSE), and interference cancellation (IC) principles. The bit-error rate (BER) performance of the MC DS-CDMA aided by the proposed MUDs is investigated by simulation approaches. Our study shows that, in addition to the advantages provided by a general ZF, MMSE, or IC-assisted MUD, the proposed MUD schemes can be implemented using modular structures, where most modules are independent of each other. Due to the independent modular structure, in the proposed MUDs one module may be reconfigured without yielding impact on the others. Therefore, the MC DS-CDMA, in conjunction with the proposed MUDs, constitutes one of the promising multiple access schemes for communications in the dynamic communications environments such as in the cognitive radios.