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Apparatus and method for signal strength compensation of highly time-variant mobile radio channels and reception unit for mobile radio transmission
| Details |
Inventors: Yang, Bin;
Assignee: Infineon Technologies AG (Munich, DE)
Primary Examiner: Milord; Marceau
Assistant Examiner:
Attorney, Agent or Firm: Greenberg; Laurence A. Stemer; Werner H. Locher; Ralph E.
A signal strength compensation unit for mobile radio receivers is connected upstream of the channel estimator and the channel equalizer and compensates for, in particular, the great, brief signal strength fluctuations within a data burst. Likewise, a method for signal strength compensation compensates for brief signal strength fluctuations within the data burst. To these ends, a signal strength average is determined from the signal strengths for the previously received data symbols. The current signal is then aligned with this signal strength average. The inventive signal strength compensation allows the bit error rate during data equalization to be significantly reduced. |
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DETAILED DESCRIPTION It is accordingly an object of the invention to provide an apparatus and a method for signal strength compensation of highly time-variant mobile radio channels and reception unit for mobile radio transmission that overcome the hereinafore-mentioned disadvantages of the heretofore-known devices of this general type and that provide signal strength compensation for a sequence of received signals and that can be used for processing large signal strength fluctuations within a burst.
With the foregoing and other objects in view, there is provided, in accordance with the invention, an apparatus for signal strength compensation for a sequence of received digital signal values in a mobile radio receiver.
The apparatus includes a signal strength determiner, two calculators, and a signal strength aligner.
The signal strength determiner produces a signal strength value representing a signal strength of a current digital signal value.
The calculator calculates a signal strength average, tracked to the current signal value, from previous signal values in the sequence.
The signal strength aligner aligns the current digital signal value with the signal strength average using a calculation.
With the objects of the invention in view, there is also provided a reception unit for mobile radio transmission.
The reception unit includes a channel estimator, a channel equalizer, and a signal strength compensation apparatus as discussed in the previous paragraph.
The channel estimator ascertains channel coefficients h.
sub.
0, .
.
.
h.
sub.
L for modeling a transmission channel.
The channel equalizer equalizes received signals using the channel coefficients ascertained by the channel estimator.
The signal strength compensation apparatus is connected upstream of the channel estimator and the channel equalizer.
With the objects of the invention in view, there is also provided a method for signal strength compensation for a sequence of received digital signal values.
The method includes the following steps
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