Frame-extended linear decorrelating detector for asynchronous CDMA

• Published in: IEEE transactions on vehicular technology Vol. 49; no. 5; pp. 1918 - 1927
• Main Authors: Mengkang Peng, Sasabo, M.F., Hingjie Jay Guo, Downing, O.J., Barton, S.K.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01-09-2000; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Code division multiplexing; Code standards; Computer architecture; Computer simulation; Decorrelation; Delay; Detectors; Equipments and installations; Exact sciences and technology; Feasibility; Frames; Mobile radiocommunication systems; Multiaccess communication; Multiple access; Noise; Noise reduction; Radiocommunications; Regulation; Scholarships; Telecommunications; Telecommunications and information theory; Anticorrelation; Asynchronism; Coding; Code division multiple access; Theoretical study; Numerical simulation; Processing time; Feasibility; Delay time; Detection; Asynchronous transmission
• DOI: 10.1109/25.892594
• EISSN: 1939-9359
• ISSN: 0018-9545

The standard linear decorrelating detector (LDD) for asynchronous code-division multiple access involves complicated computations and long detection delay. The one-shot LDD with a frame of 1-bit period length leads to a simpler architecture with less than 1-bit detection delay but significant noise enhancement compared with the standard LDD. In this paper, extending the frame to more than one bit period, a frame-extended LDD (FELDD) is proposed. With a slight increase of complexity and detection delay, the noise enhancement of the FELDD is greatly reduced compared with the one-shot LDD and approaches that of the standard DD. The total number of users supported is also increased compared with that of the one-shot LDD. Theoretical analysis and computer simulations are used to demonstrate the feasibility of the proposed scheme.