Reduced rank noncoherent interference suppression for CDMA communications

• Published in: Conference Record of the Thirty-Eighth Asilomar Conference on Signals, Systems and Computers, 2004 Vol. 1; pp. 918 - 922 Vol.1
• Main Authors: Koc, A.T., Ozdemir, O., Torlak, M.
• Format: Conference Proceeding
• Language: English
• Published: Piscataway NJ IEEE 2004
• Subjects: Applied sciences; Channel estimation; Detection, estimation, filtering, equalization, prediction; Detectors; Exact sciences and technology; Feedback; Filters; Frequency estimation; Frequency-selective fading channels; Information, signal and communications theory; Interference suppression; Mean square error methods; Multiaccess communication; Multipath channels; Radiocommunications; Signal and communications theory; Signal, noise; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Transmission and modulation (techniques and equipments); Transmitters. Receivers; Fading channels; Fading; Multiple access; Parameter estimation; Multistage method; Noise reduction; Bit error rate; Wireless telecommunication; Receiver; Multipath channels; Mean square error; Interference suppression; Frequency selection; Channel estimation; Code division multiple access; Differential method; Multistage circuit; Signal detection
• ISBN: 0780386221; 9780780386228
• DOI: 10.1109/ACSSC.2004.1399272

Noncoherent receivers are used for frequency-selective fading channels where the estimation of channel is difficult. The channel estimation can be more cumbersome for asynchronous code division multiple access (A-CDMA) systems due to multiaccess interference. A noncoherent reduced rank receiver which has less complexity as compared to noncoherent full rank linear minimum mean square error (MMSE) receiver is proposed for A-CDMA systems. The receiver for multipath channels consists of a reduced rank filter and a decision feedback differential detector (DF-DD) for each path. A generic bit error rate formula is provided for noncoherent reduced rank multistage decision feedback differential detection scheme.