Improving ACIPR for land mobile radio systems using coded modulation

Author

Chennakeshu, Sandeep ; Ramesh, R. ; Hassan, Amer A. ; Anderson, John B.

Author_Institution

General Electric Co., Schenectady, NY, USA

fYear

1992

fDate

10-13 May 1992

Firstpage

856

Abstract

The spectral efficiency for land mobile radio (LMR) systems is primarily limited by adjacent channel interference (ACI). Conventional digital modulation schemes do not meet current ACI protection specifications, unless augmented by powerful interference mitigation techniques. High spectral efficiency and ACI protection can be achieved by using trellis codes that are specifically designed to maximize the adjacent channel interference protection ratio (ACIPR). A spectral optimization is done in conjunction with appropriate transmit and receive filters and constraints on peak-to-average transmit power ratio and minimum distance of the code. The theory of spectral shaping to maximize ACIPR is discussed, and examples are presented to illustrate the potential of the approach for LMR systems

Keywords

mobile radio systems; radiofrequency interference; spectral analysis; trellis codes; ACI; ACIPR; adjacent channel interference; adjacent channel interference protection ratio; coded modulation; land mobile radio systems; minimum code distance; peak-to-average transmit power ratio; spectral efficiency; spectral optimization; spectral shaping; trellis codes; Bandwidth; Bit error rate; Euclidean distance; Filters; Frequency response; Interference; Land mobile radio; Modulation coding; Radio transmitters; Shift registers;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 1992, IEEE 42nd

Conference_Location

Denver, CO

ISSN

1090-3038

Print_ISBN

0-7803-0673-2

Type

conf

DOI

10.1109/VETEC.1992.245291

Filename

245291