Title :
Multi-user detection for mutually orthogonal sequences with space-time coding
Author :
Ozgur, Selcuk ; Williams, Douglas B.
Author_Institution :
Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA, USA
Abstract :
We exploit the properties of mutually orthogonal (MO) complementary sets and space-time (ST) codes for multi-user communications with spatial diversity. ST codes enable the uncoupling of the data channels from the transmitter to the receiver. The properties of the MO sequences are used to distinguish between the desired user and the interferers. As a result, we achieve a high order of diversity in flat Rayleigh fading channels and the ability to cancel multi-user interference (MUI). When the interferers´ received power approaches the received power of the desired user, some performance loss is seen. This degradation resembles the near-far effect with some direct sequence code division multiple access (DS-CDMA) receivers.
Keywords :
Rayleigh channels; diversity reception; interference suppression; multiuser detection; radiofrequency interference; sequences; space-time codes; DS-CDMA receivers; MUI; direct sequence code division multiple access; diversity; flat Rayleigh fading channels; flat fading channels; multi-user detection; multiuser detection; multiuser interference cancellation; mutually orthogonal complementary sets; mutually orthogonal sequences; near-far effect; space-time codes; space-time coding; spatial diversity; Fading; Interference cancellation; Maximum likelihood decoding; Maximum likelihood detection; Multiaccess communication; Multicarrier code division multiple access; Multiuser detection; Radio frequency; Radio transmitters; Space technology;
Conference_Titel :
Vehicular Technology Conference, 2003. VTC 2003-Fall. 2003 IEEE 58th
Print_ISBN :
0-7803-7954-3
DOI :
10.1109/VETECF.2003.1285073
