Title :
A new CDMA scheme for multicasting using information classes
Author :
Clare, L.P. ; Baker, J.E. ; Sastry, A.R.K.
Author_Institution :
Sci. Center, Rockwell Int. Corp., Thousand Oaks, CA, USA
Abstract :
A new method of code allocation in code division multiple access is proposed that is particularly efficient in meeting multicasting needs, based on the concept of partitioned information `classes´ (CDMA-IC). Transmitters choose spreading codes based on the types of messages they are transmitting, and receivers listen to codes corresponding to the types of messages they are interested in. The performance of this approach can exceed that of both the traditional receiver-directed codes or broadcast codes in environments where there are several multicast groups (in which a given message is of interest to more than one node). Performance is further enhanced when receivers can simultaneously attempt to correlate multiple spreading codes. In a previous paper the authors (see IEEE Military Communications Conference (MILCOM), p.556-560, Boston, October 1993) demonstrated the superiority of CDMA-IC over receiver-directed CDMA and broadcasting, using simulation of some preliminary concepts of the scheme. In this paper, we describe a broader theoretical framework considering such attributes as priorities, relevance and `value´ of the messages, in which the CDMA-IC scheme scheme could be tailored for different scenarios and could be parameterized appropriately
Keywords :
code division multiple access; correlation methods; military communication; pseudonoise codes; radio receivers; radio transmitters; spread spectrum communication; CDMA-IC; broadcast codes; code allocation; code division multiple access; correlation; information classes; military communication; multicast groups; multicasting; performance; receiver-directed CDMA; receiver-directed broadcasting; receiver-directed codes; receivers; simulation; spreading codes; transmitters; Access protocols; Broadcasting; Databases; Jamming; Missiles; Multiaccess communication; Multicast communication; Spread spectrum communication; Telecommunication traffic; Transmitters;
Conference_Titel :
Military Communications Conference, 1994. MILCOM '94. Conference Record, 1994 IEEE
Conference_Location :
Fort Monmouth, NJ
Print_ISBN :
0-7803-1828-5
DOI :
10.1109/MILCOM.1994.473972