Transmission capacity of CDMA ad-hoc networks

Author

Weber, Steven ; Yang, Xiangying ; De Veciana, Gustavo ; Andrews, Jeffrey G.

Author_Institution

Texas Univ., Austin, TX, USA

fYear

2004

fDate

30 Aug.-2 Sept. 2004

Firstpage

245

Lastpage

249

Abstract

Spread spectrum technologies are appropriate for ad-hoc networking because they permit interference averaging and tolerate colocated simultaneous transmissions. We develop analytical results on the transmission capacity of a CDMA ad-hoc network. Transmission capacity is defined as the maximum permissible density of simultaneous transmissions that allows a certain probability of successful reception. We obtain closed-form upper and lower bounds on the transmission capacity for both frequency hopped (FH-CDMA) and direct sequence (DS-CDMA) implementations of CDMA. Our analysis shows that FH-CDMA obtains a higher transmission capacity than DS-CDMA on the order of M^1-2α/, where M is the spreading factor and α>2 is the path loss exponent. The interpretation is that FH-CDMA is generally preferable to DS-CDMA for ad-hoc networks.

Keywords

ad hoc networks; code division multiple access; frequency hop communication; probability; radio reception; spread spectrum communication; CDMA ad-hoc networks; DS-CDMA; FH-CDMA; closed-form bounds; colocated simultaneous transmissions; direct sequence CDMA; frequency hopped CDMA; path loss exponent; spread spectrum technologies; spreading factor; successful reception probability; transmission capacity; Ad hoc networks; Aggregates; Capacity planning; Decoding; Frequency; Interference; Multiaccess communication; Signal to noise ratio; Spread spectrum communication; Transmitters;

fLanguage

English

Publisher

ieee

Conference_Titel

Spread Spectrum Techniques and Applications, 2004 IEEE Eighth International Symposium on

Print_ISBN

0-7803-8408-3

Type

conf

DOI

10.1109/ISSSTA.2004.1371701

Filename

1371701