Interference model for ad hoc DS/CDMA packet radio networks with variable coherent modulation

Author

Souryal, Michael R. ; Vojcic, Branimir R. ; Pickholtz, Raymond L.

Author_Institution

Dept. of Electr. & Comput. Eng., George Washington Univ., DC, USA

Volume

1

fYear

2003

fDate

13-16 Oct. 2003

Firstpage

1

Abstract

This paper presents a model for the multiple access interference (MAI) in an ad hoc DS/CDMA packet radio network in which multiple modulation schemes are used. One application of this model is in the performance analysis of ad hoc networks using adaptive modulation, where each node may be using a different modulation scheme depending on channel conditions or rate requirements. Previous work has shown that the MAI in a random access packet radio network can be characterized by an α-stable distribution. This model is extended to account for systems using two-dimensional constellations and is compared with simulation results to validate the model. In particular, the accuracy of the model is examined for low processing gain, and a previously used assumption of independent shadowing on different links is tested in a correlated shadowing environment.

Keywords

ad hoc networks; adaptive modulation; code division multiple access; radiofrequency interference; spread spectrum communication; α-stable distribution; DS-CDMA packet radio network; ad hoc network; adaptive modulation; direct sequence code division multiple access; interference model; multiple access interference; random access packet radio network; shadowing; two-dimensional constellations; variable coherent modulation; Ad hoc networks; Analytical models; Attenuation; Fading; Frequency; Multiaccess communication; Multiple access interference; Packet radio networks; Shadow mapping; Stochastic processes;

fLanguage

English

Publisher

ieee

Conference_Titel

Military Communications Conference, 2003. MILCOM '03. 2003 IEEE

Print_ISBN

0-7803-8140-8

Type

conf

DOI

10.1109/MILCOM.2003.1290067

Filename

1290067