Method of determining a free channel in FDM radiocommunication systems
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United States of America Patent
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Oct 22, 1996
Grant Date -
N/A
app pub date -
Apr 11, 1995
filing date -
Oct 21, 1992
priority date (Note) -
In Force
status (Latency Note)
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Abstract
In radio transmission systems having a number of radio channels available for transmission, it is necessary to recognize a transmission channel as idle. One known way of doing this is to measure the field strength on the transmission channel and carry out a threshold decision. As soon as the field strength in a transmission channel is below a preset value, this transmission channel is recognized as idle. In measuring field strength, the field strength is averaged over the entire bandwidth of the transmission channel. As a result, a transmission channel that experiences interference from the signals on its adjacent channels may not be recognized as idle, although the adjacent-channel interference has little effect on the transmission quality. The new method makes it possible to recognize the signal present in a transmission channel by means of numerous narrowband field strength measurements. The transmission bandwidth can then be better utilized, as especially adjacent-channel interference and other forms of interference occurring only at the upper and lower ends of the frequency range of the transmission channel are recognized without the transmission channel's being recognized as occupied. The method as per the invention can be used in all radio transmission systems with independent channel search.
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