A Simple Transmit/Receive Antenna Diversity for Indoor DS/CDMA Wireless Communication Systems

Koichiro BAN  Masaaki KATAYAMA  Takaya YAMAZATO  Akira OGAWA  

IEICE TRANSACTIONS on Communications   Vol.E80-B   No.12   pp.1790-1796
Publication Date: 1997/12/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Radio Communication
multi-antenna transmission,  flat fading,  CDMA,  diversity,  

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This paper proposes a direct-sequence spread spectrum (DS/SS) communication system with a new diversity technique designed for indoor multi-path fading channels where path diversity isn't available. In this system, the transmitter sends a same signal from multiple antennas at the same time with intentional time delays, which allows the receiver to distinguish and combine the signals from different antennas. We also consider the combination of this scheme with the conventional receiving antenna diversity for additional diversity gain. Furthermore, it is found that the use of the multiple transmitting antennas decreases the effect of the multiple access interference.