Title :
Signal detection on wireless CDMA downlink
Author :
Yue, Lin ; Johnson, Don H.
Author_Institution :
Dept. of Electr. & Comput. Eng., Rice Univ., Houston, TX, USA
Abstract :
On the downlink of a wireless code division multiple access (CDMA) system, single-user detectors have to be used because of the lack of the knowledge of the code, timing and power of other users. Moreover, since accurate channel modeling can be difficult, blind receivers and receivers based on training data rather than models are highly desirable. Developed from the universal classification theory, type-based receivers assume no a priori channel model, and are quite effective in direct-sequence spread spectrum single-user systems based on training data. We generalize the type-based receiver to multi-user systems. During the training stage, the exponential rates at which the error probabilities decay are maximized through optimal quantization. Our receiver operates on empirically observed sequences and rejects the unknown multiple access interference effectively in near-far situations
Keywords :
code division multiple access; error statistics; interference suppression; land mobile radio; quantisation (signal); radio links; radio receivers; radiofrequency interference; signal detection; blind receivers; code division multiple access; direct-sequence spread spectrum; empirically observed sequences; error probabilities; exponential decay rates; mobile station; multi-user systems; multiple access interference rejection; near-far situations; optimal quantization; signal detection; single-user detectors; training data; type-based receivers; universal classification theory; wireless CDMA downlink; Detectors; Downlink; Error probability; Multiaccess communication; Power system modeling; Quantization; Signal detection; Spread spectrum communication; Timing; Training data;
Conference_Titel :
Vehicular Technology Conference, 1998. VTC 98. 48th IEEE
Conference_Location :
Ottawa, Ont.
Print_ISBN :
0-7803-4320-4
DOI :
10.1109/VETEC.1998.686214