Improved OVSF/CDMA Code Assignment in MANET Using Directional Antenna

Author

Hajjarian, Zeinab ; Yazdani, Naser

Author_Institution

Dept. of Electr. & Comput. Eng., Tehran Univ.

fYear

2005

fDate

5-5 Oct. 2005

Firstpage

430

Lastpage

434

Abstract

CDMA (code division multiple access) is one of the most important methods of multiple access since it can provide a higher capacity compared to analog equipment and digital platforms. OVSF (orthogonal variable spreading factor) codes are variable bit rate code words that not all of them are orthogonal to each other. The code assignment variant used to assign these codes to network nodes is called prefix-free vertex coloring. Code assignment algorithm in MANET tries to maximize throughput and/or bottleneck. In this paper, we show that directional antennas can help us to simplify the interference graph and reduce the conditions that code assignment algorithm should maintain. Simulation results show a significant increase in throughput and bottleneck

Keywords

ad hoc networks; code division multiple access; codes; directive antennas; graph colouring; mobile radio; MANET; OVSF-CDMA code assignment; code division multiple access; directional antenna; interference graph; orthogonal variable spreading factor codes; prefix-free vertex coloring; variable bit rate code words; Ad hoc networks; Analog computers; Bit rate; Directional antennas; Energy consumption; Interference; Media Access Protocol; Mobile ad hoc networks; Multiaccess communication; Throughput; Bottleneck; CDMA; Directional Antenna; Interference Graph; MANET; OVSF Code Assignment; Throughput;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications, 2005 Asia-Pacific Conference on

Conference_Location

Perth, WA

Print_ISBN

0-7803-9132-2

Type

conf

DOI

10.1109/APCC.2005.1554095

Filename

1554095