Compensation based bit-error-rate estimation for convolutionally encoded transmissions in wireless systems
AssigneeLucent Technologies Inc.
InventorsPantelis Monogioudis, Kiran M. Rege
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Abstract
In a UMTS (universal mobile telecommunications system) based system, a wireless receiver comprises a convolutional decoder, a processor and memory. The convolutional decoder processes a received signal and provides a Yamamoto-Itoh (YI) metric to the processor. The processor (a) retrieves, from a look-up table stored in the memory, a compensation factor as a function of the YI metric value provided by the Viterbi decoder; (b) retrieves, from another look-up table stored in the memory, an initial BER estimate as a function of the YI metric; and (c) modifies the initial BER estimate with the retrieved compensation value to provide a BER estimate.
Claims11
A method for use in wireless equipment, the method comprising the steps of:
- receiving a signal;
- processing the received signal to generate a Yamamoto-Itoh (YI) metric;
- and
- providing a Bit-Error-Rate (BER) estimate for the received signal as a function of the YI metric.
A method for use in wireless equipment, the method comprising the steps of:
- processing a received signal to provide at least one Yamamoto-Itoh (YI) metric value over a time period;
- selecting a compensation factor value as a function of the provided YI metric value;
- selecting an initial BER estimate value as a function of the provided YI metric value;
- and
- providing a Bit-Error-Rate (BER) estimate for the received signal as a function of the initial BER estimate value and the selected compensation factor value.
A method for use in wireless equipment, the method comprising the steps of:
- processing a received signal to provide an initial BER estimate value for the received signal;
- modifying the initial BER estimate value for the received signal with a compensation factor value to provide a Bit-Error-Rate (BER) estimate for the received signal, wherein the compensation factor value is determined as a function of at least one Yamamoto Itoh (YI) metric value.
Apparatus for use in wireless equipment, the apparatus comprising:
- a convolutional decoder for processing a received signal for use in determining at least one Yamamoto-Itoh (YI) metric value;
- and
- a processor for providing a Bit-Error-Rate (BER) estimate for the received signal as a function of the at least one YI metric value.
A wireless receiver comprising:
- a processor;
- and
- a memory for storing a look-up table;
- wherein the processor uses a Yamamoto-Itoh (YI) metric value as in index into the look-up table to retrieve an associated Bit-Error-Rate (BER) for a received signal.
A wireless receiver comprising:
- a memory for storing a look-up table such that an index into the look-up table is a Yamamoto-Itoh (YI) metric value for retrieving an initial Bit-Error-Rate (BER) estimate value stored therein;
- and
- a processor for modifying the initial BER value with a scale factor to provide a Bit-Error-Rate (BER) estimate for a received signal.
Dependencies are inferred from the claim text.