Delay based sector beam synthesis in a multi-beam antenna system
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United States of America Patent
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Issued Date -
Jan 17, 2008
app pub date -
Apr 4, 2007
filing date -
Apr 4, 2006
priority date (Note) -
Abandoned
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Abstract
A novel method and apparatus for synthesizing beams in a multi-beam antenna system is disclosed. In such systems, adjacent beams typically have overlapping coverage areas. When a common signal is broadcast across a plurality of such overlapping beams, the introduction of phase differences between adjacent beams may destructively interfere, resulting in reduced coverage area, significant fading or possibly even loss of the signal. The present invention introduces a temporal delay in alternating beams so that even if a common signal is broadcast, the temporal delay will minimize the likelihood of significant destructive interference. The delay may correspond to a symbol period, a multiple or fraction thereof, or a chirp, depending upon the encoding scheme employed. Where no common signal is to be broadcast, the imposition of a delay on a subset of the beams has negligible effect.
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