DocumentCode :
2296354
Title :
A system for test of multiaccess methods based on OFDM
Author :
Engström, Bo ; Östberg, Christer
Author_Institution :
Telia Res., Lulea, Sweden
fYear :
1994
fDate :
8-10 Jun 1994
Firstpage :
1843
Abstract :
There are several methods developed to deal with time dispersion on a radio channel. One of the methods, OFDM (“orthogonal frequency division multiplexing”), has only been used for broadcasting of digital radio and television and has not previously been used in a multiaccess environment. As OFDM seems to be an attractive alternative to CDMA and TDMA, the authors investigate some methods to make it usable in a multiaccess system. In the downlinks (base to mobile) a transmission scheme, similar to that used in an ordinary broadcasting system, could be used. For the uplinks however, one can not expect the perfect synchronization needed to get the orthogonal carriers necessary for normal OFDM signalling. The authors present a hardware radio system which currently is being developed to test different approaches for multiaccess OFDM. The system will provide a reconfigure tool for the implementation of different synchronization methods, user multiplexing approaches and detection strategies. The system will be built around VME based SUN Sparc stations. The signal processing will be performed by dedicated FFT processors, general purpose digital signal processors and standard ICs for other time critical tasks
Keywords :
cellular radio; frequency division multiplexing; land mobile radio; multi-access systems; radio equipment; signal detection; synchronisation; telecommunication channels; FFT processors; OFDM; VME based SUN Sparc stations; detection; digital signal processors; downlinks; hardware radio system; multiaccess methods; orthogonal carrier; orthogonal frequency division multiplexing; reconfigure tool; signal processing; standard ICs; synchronization; test; time dispersion; uplinks; Digital communication; Downlink; Frequency division multiplexing; Frequency synchronization; Multiaccess communication; OFDM; Radio broadcasting; System testing; TV broadcasting; Time division multiple access;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Vehicular Technology Conference, 1994 IEEE 44th
Conference_Location :
Stockholm
ISSN :
1090-3038
Print_ISBN :
0-7803-1927-3
Type :
conf
DOI :
10.1109/VETEC.1994.345418
Filename :
345418
Link To Document :
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