What is claimed is:
1. A wireless communication apparatus for avoiding mutual interference between wireless communication systems, comprising:
a measurement unit for measuring a channel state of a transmission slot;
a judgment unit for judging a data transmission on the basis of the channel state of the transmission slot measured in the measurement unit; and
a control unit for outputting a signal for performing a transmission operation of data according to the judgment of the judgment unit.
2. The apparatus according to claim 1, wherein the measurement unit measures a strength of a signal received from a channel to be used in the transmission slot.
3. The apparatus according to claim 1, wherein the judgment unit judges that the channel has a good state when the strength of the received signal is smaller than a strength of a reference signal.
4. A wireless communication method for avoiding mutual interference between wireless communication systems, comprising the steps of:
(a) measuring a channel state of a transmission slot;
(b) judging a data transmission on the basis of the measurement result of the channel state of the transmission slot from step (a); and
(c) transmitting data through the transmission slot according to the judgment result of step (b).
5. The method according to claim 4, wherein step (a) comprises the sub-steps of:
(a1) varying a frequency of a channel to be used in a transmission slot; and
(a2) measuring a strength of a signal received from the varied channel.
6. The method according to claim 5, wherein step (b) judges whether the channel has a good state, and decides the data transmission when the strength of the received signal is smaller than a strength of a reference signal.
7. The method according to claim 5, wherein, when the strength of the received signal is greater than the strength of the reference signal, step (b) abandons the data transmission using the transmission slot, and repeats the procedure of steps (a) and (b) on a succeeding transmission slot.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. System for tuning a simple or complex multicavity high frequency and microwave filter, including a body filter; a removable lid; n resonant cavities in said body filter; n resonant rods, disposed in the middle of each cavity; n tuners passing through the filter lid in correspondence to each resonating rod and tuner moving device, characterized in that:
a subsystem is associated with each tuner to compensate for vibrations and oscillations; and
the lid is provided with n slots, which are longitudinally placed over the middle of the cavity and have a length sufficient to assure the tuning in every frequency band.
2. System according to claim 1, in which the subsystem comprises means for longitudinal translation of said tuners and means for making the tuner components elastic.
3. System according to claim 2, in which the longitudinal translation means are slides associated to a motor device and the means for making the tuner components elastic comprises a shock absorber made of a helical spring orthogonal to the slide axis.
4. System according to claim 1, in which the tuner is made of a plurality of elements, including a head and a nut for blocking movement of the tuner on a slide, said head being formed of a threaded cylinder and of a rectangular element which penetrates into a corresponding niche in the slide in order to reduce a vertical dimension of the system.
5. System according to claim 1, in which an inferior portion of each tuner passes through the slot, and a superior portion of each tuner is engaged into a groove of a cover of the filter.
6. System according to claim 4, in which the head and nut are made of polyetherimide polymer.
7. System according to claim 4, in which blocks, overlay the slide in corresponding grooves, fixing movement of the slide in vertical and horizontal direction.
8. System according to claim 1, in which by means of stabilizing subsystem, mechanical tolerances due to the assembly process and vibration related to the movement are compensated.
9. System according to claim 4, in which the elements for blocking the tuner on the slide control cavity frequency response.