Multiplex communications – Diagnostic testing – Determination of communication parameters
Patent
1997-03-28
2000-05-16
Jung, Min
Multiplex communications
Diagnostic testing
Determination of communication parameters
370328, 370347, 455501, 455 63, 455 671, H04J 314, H04B 110
Patent
active
060646551
DESCRIPTION:
BRIEF SUMMARY
The invention relates to temperature correction in a telecommunications receiver, in particular in a receiver for signals sent in time slots within fixed length time frames.
The present invention is defined in the claims to which reference should now be made.
According to one aspect, the present invention preferably consists in a method of correcting the output of the receiver in a time division multiplex broadcast unit in accordance with ambient temperature of the receiver, comprising providing an input reference noise signal to the receiver in a predetermined time slot of a time division multiplex channel of the unit and processing the corresponding output noise signal from the receiver to determine a correction factor which is related to a measured value of the current ambient temperature, this factor being used subsequently to correct output signals from the receiver at said ambient temperature.
The invention preferably provides a time division multiplex broadcast unit comprising a receiver, a noise source, temperature measurement means and processing means, the noise source selectively providing a noise signal as an input to the receiver in a predetermined time slot of the time division multiplex channel so that the receiver provides an output signal dependent on the magnitude of the input noise signal and at least one temperature as measured by the temperature measurement means, and the processing means serving to determine an input signal correction factor from the signal and storing this correction factor against the associated temperature.
The receiver can be a transmitter/receiver ("transceiver"). The broadcast unit can be a base station for time division multiplex/time division multiple access (TDM/TDMA) communications with a plurality of subscriber units which can be at fixed locations. The receiver can receive TDMA.
Preferably, correction factors for different associated temperatures are determined, and stored for use in temperature compensation of received signals. The temperature measuring means can measure a first temperature value at a first location of the broadcast unit, and a second temperature at a second location. The first location can be adjacent to an antenna. The antenna can be exposed, for example, at the top of a mast head. The second location can be adjacent processing circuitry, particularly in the body of the broadcast unit.
Each correction factor can be determined dependent on a plurality of temperatures and stored together with data representing those temperatures, for example, as a look-up table in microprocessor memory. In particular, a correction value can be associated with a temperature measured at the first position and a temperature measured at the second position.
The stored correction factors can be updated intermittently or continuously, according to a predetermined rule. In particular, correction update or re-calibration can occur after a predetermined period of time has elapsed or whenever a novel combination of temperatures is encountered. Re-calibration can also be initiated under microprocessor control, whenever a fault condition is suspected.
In essence, the look-up table of correction factors can be filled in "as you go". No separate initial calibration procedure is required.
With repeated calibration, changes in correction factors and/or temperatures can be monitored, allowing detection of fault conditions. Furthermore, changes in the apparent noise received at a site can be monitored.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 shows the telecommunications receiver in accordance with the present invention.
A preferred embodiment of the invention will now be described by way of example and with reference to the drawing illustrating a preferred base station according to the present invention.
The drawing shows a base station comprising a mast which supports an aerial 1 at the top and a radio unit 2 near the aerial with an input-output connection to the aerial. This connection comprises a diplexer unit 3 through which a transmitter 4 and a receiver 5 are conn
REFERENCES:
patent: 4630482 (1986-12-01), Traina
patent: 4747095 (1988-05-01), Crookshanks
patent: 5170392 (1992-12-01), Riordan
patent: 5351016 (1994-09-01), Dent
patent: 5513183 (1996-04-01), Kay et al.
patent: 5697073 (1997-12-01), Daniel et al.
Ionica International Limited
Jung Min
LandOfFree
Method and apparatus for temperature compensation in a time divi does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for temperature compensation in a time divi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for temperature compensation in a time divi will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-264974