Superposition Coding Strategies: Design and Experimental Evaluation

Author

Vanka, S. ; Srinivasa, S. ; Gong, Z. ; Vizi, P. ; Stamatiou, K. ; Haenggi, M.

Volume

11

Issue

7

fYear

2012

fDate

7/1/2012 12:00:00 AM

Firstpage

2628

Lastpage

2639

Abstract

We design and implement a software-radio system for Superposition Coding (SC), a multiuser transmission scheme that deliberately introduces interference among user signals at the transmitter, using a library of off-the-shelf point-to-point channel codes. We experimentally determine the set of rate-pairs achieved by this transmission scheme under a packet-error constraint. Our results suggest that SC can provide substantial gains in spectral efficiencies over those achieved by orthogonal schemes such as Time Division Multiplexing. Our findings also question the practical utility of the Gaussian approximation for the inter-user interference in Superposition-Coded systems.

Keywords

Gaussian processes; approximation theory; channel coding; orthogonal codes; radio transmitters; radiofrequency interference; software radio; Gaussian approximation; SC systems; interference; interuser interference; multiuser transmission scheme; off-the-shelf point-to-point channel codes; orthogonal schemes; packet-error constraint; radio transmitter; software-radio system; superposition coding strategies; time division multiplexing; user signals; Decoding; Encoding; Indexes; Interference; Libraries; Reliability; Wireless communication; GNURadio; software-defined radio; superposition coding; universal software radio peripheral;

fLanguage

English

Journal_Title

Wireless Communications, IEEE Transactions on

Publisher

ieee

ISSN

1536-1276

Type

jour

DOI

10.1109/TWC.2012.051512.111622

Filename

6204010