Improving ACIPR for land mobile radio systems using coded modulation

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 efficienc...

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Bibliographic Details
Main Authors: Chennakeshu, S., Ramesh, R., Hassan, A.A., Anderson, J.B.
Format: Conference Proceeding
Language:English
Subjects:
Bandwidth
Bit error rate
Euclidean distance
Filters
Frequency response
Interference
Land mobile radio
Modulation coding
Radio transmitters
Shift registers
Online Access:Request full text
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Summary: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.< >
ISSN:1090-3038
2577-2465
DOI:10.1109/VETEC.1992.245291