Title :
On the spectral efficiency of CDMA with multiple antennas
Author :
Sudarshan, Pallav ; Hughes, Brian L.
Author_Institution :
Dept. of Electr. & Comput. Eng., North Carolina State Univ., Raleigh, NC, USA
fDate :
6/23/1905 12:00:00 AM
Abstract :
We consider the impact of transmit diversity on the capacity of synchronous, randomly-spread code-division multiple-access, in the presence of frequency-flat fading. For large user populations, we characterize the spectral efficiency (capacity per chip) of two systems that use different spreading sequences on each antenna: a theoretically optimal system in which each transmit antenna is fed by independent data streams, and a code sequence diversity scheme that transmits the same data on each antenna
Keywords :
channel capacity; code division multiple access; diversity reception; fading channels; mobile radio; CDMA; capacity per chip; code sequence diversity scheme; frequency-flat fading; independent data streams; multiple antennas; randomly-spread code-division multiple-access; spectral efficiency; spreading sequences; synchronous code-division multiple-access; theoretically optimal system; transmit diversity; Antenna theory; Base stations; Broadband antennas; Diversity methods; Fading; Frequency diversity; Multiaccess communication; Proposals; Receiving antennas; Transmitting antennas;
Conference_Titel :
Information Theory Workshop, 2001. Proceedings. 2001 IEEE
Conference_Location :
Cairns, Qld.
Print_ISBN :
0-7803-7119-4
DOI :
10.1109/ITW.2001.955150
