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US 2011/0235683 A1Published application
Antenna systems with common overhead for cdma base stations
AssigneeNortel Networks Limited
InventorsAbdelgader Legnain, Peter Deane, Neil M. McGowan
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Abstract
Systems and methods for use in CDMA antenna systems are provided in which signals each having a common overhead component are transmitted on a set of adjacent beams of a sector with a micro-timing offset between signals transmitted on adjacent pairs of beams which is large enough that destructive cancellation substantially does not occur between the pair of beams.
Claims33
1-27. (canceled)
A multi-beam antenna system, comprising:
- at least two antennas defining at least two respective antenna beams which form a coverage area;
- at least one signal generator operable to generate a respective signal for each of the at least two antennas, each respective signal comprising a common part and a unique part, the common part being common to the at least two signals and using a coverage area spreading code;
- transceiver and beam-forming circuitry operable to couple the at least one signal generator to the antennas, the respective signals to be transmitted substantially simultaneously;
- and
- for adjacent antennas, the respective common part having a micro-timing offset applied to the coverage area spreading code of one antenna relative to the coverage area spreading code of the other antenna of the at least two antennas, the micro-timing offset being large enough that destructive cancellation substantially does not occur between the respective signal common parts transmitted on the respective adjacent beams.
2 more elements
A method of operating a multi-beam antenna system, the method comprising:
- for each antenna of at least two adjacent antennas defining at least two respective antenna beams which form a coverage area, generating a respective signal comprising a common part and a unique part, the common part using a coverage area spreading code and the common part of one generated signal having a micro-timing offset applied to the coverage area spreading code relative to the common part of the other generated signal, the micro-timing offset being large enough that destructive cancellation substantially does not occur between the respective signal common parts transmitted on the respective adjacent antennas;
- and
- coupling the respective generated signals to the antennas, for substantially simultaneous transmission.
Dependencies are inferred from the claim text.