Receive antenna selection method and diversity receiver
AssigneeFutaba Denshi Kogyo K.K.
InventorsAtsushi Hoshikuki, Satoru Ishii
Life of this patent
Estimating the term…
Abstract
A receive antenna selection method and a diversity receive capable of preventing a deterioration in transmission efficiency in a multipath environment. A receive antenna for receiving a packet is selected during a period of time for which a preamble section of the packet is received, to thereby keep change-over between packets from being carried out during receiving of the packet. This eliminates a situation that a packet must be nullified due to generation of a bit error by change-over between receive antennas during receiving of the packet, to thereby keep transmission efficiency from being deteriorated even in a multipath environment.
Claims2
A diversity receiver for a spread spectrum radio packet communication system, comprising:
- a plurality of diversity receive antennas;
- a reverse spread demodulation circuit;
- a receive antenna change-over circuit for selecting any one of said plurality of diversity receive antennas to connect it to said reverse spread demodulation circuit;
- said reverse spread demodulation circuit executing processing of correlation between a receive signal inputted thereto from said diversity receive antenna connected thereto by means of said receive antenna change-over circuit and a spread code thereof;
- and
- a change-over control circuit for controlling said receive antenna change-over circuit;
- said change-over control circuit carrying out control so as to attain selection between said plurality of diversity receive antennas while changing over said plurality of diversity receive antennas in order during a period of time for which any correlation peak is not detected during outputting of said reverse spread demodulation circuit and so as not to attain change-over between said plurality of diversity receive antennas when correlation peaks in a predetermined number or more are detected during outputting of said reverse spread demodulation circuit.
Method of selecting a receive antenna in a radio package communication system of the spread spectrum modulation type, comprising the steps of:
- receiving a signal which includes a preamble section alternately from each of a plurality of diversity receive antennas;
- generating a correlation output from said preamble and a spread code series;
- selecting one of said plurality of diversity receive antennas to be used for receiving said signal based on the first antenna having a predetermined number of peaks in said correlation output.
Dependencies are inferred from the claim text.