Method and apparatus for interference cancellation
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United States of America Patent
Stats
-
Dec 21, 1999
Grant Date -
N/A
app pub date -
Mar 30, 1998
filing date -
Mar 28, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In first radio station and a second radio station constituting a radio transmission system using spatial duplex diversity, interference signals are cancelled by a power inversion adaptive array (PIAA). One branch of the transmission side is multiplied by a complex coefficient multiplier so that the desired received signal has the optimum vector value after a combination of two branches and PIAA processing. An envelope detector detects the received signal level with an envelope detector at the receiving side, feeds back the received signal level information to the transmission side through the transmission baseband circuit, extracts the information with the receiving baseband circuit at the transmission side, and inputs the information into a constant modulus algorithm control circuit. The constant envelope algorithm control circuit sequentially controls the complex coefficient multiplier so that the multiplier has an optimum value.
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