Method and apparatus for determining rate of data transmitted at variable rates
First Claim
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1. A method for determining the rate of received data in a variable-rate communications system, the method comprising the steps of:
- (a) pre-decoding data received at variable data rates and detecting quality information of the pre-decoded data received at the respective data rates, wherein the quality information is a symbol error rate; and
(b) estimating the rate of the received data based on the quality information of the pre-decoded data at the respective data rates, wherein the pre-decoding step is performed without using Viterbi decoding.
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Abstract
A method and apparatus for determining the rate of data transmitted at variable rates. In the method and apparatus, received data is pre-decoded at receivable rates by pre-decoders which adopt a simple structure and perform pre-decoding rapidly, quality information of the pre-decoded data is detected, and the rate of the received data is estimated based on the quality information of the pre-decoded data. Therefore, the decoding speed of the received data and the decision speed of the data rate increase, reducing power consumption.
16 Citations
38 Claims
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1. A method for determining the rate of received data in a variable-rate communications system, the method comprising the steps of:
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(a) pre-decoding data received at variable data rates and detecting quality information of the pre-decoded data received at the respective data rates, wherein the quality information is a symbol error rate; and (b) estimating the rate of the received data based on the quality information of the pre-decoded data at the respective data rates, wherein the pre-decoding step is performed without using Viterbi decoding. - View Dependent Claims (2, 3)
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4. A method for determining the rate of data received by a receiver in a variable-rate communications system, the method comprising the steps of:
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(a) pre-decoding the received data at a first data rate and re-encoding the result, to output a first quality indication; (b) comparing the received data with the first quality indication, and counting the number of errors resulting from the comparison, to output an error metric for the first data rate; (c) pre-decoding the received data at a second data rate and re-encoding the result, to output a second quality indication; (d) comparing the received data with the second quality indication, and counting the number of errors resulting from the comparison, to output an error metric for the second data rate; and (e) estimating the rate of the received data using the error metrics determined for the first and second data rates; wherein the pre-decoding steps are performed without using Viterbi decoding. - View Dependent Claims (5, 6, 7, 8)
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9. An apparatus for determining the rate of received data in a variablerate communications system, the apparatus comprising:
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a first means for pre-decoding data received at variable data rates, without using Viterbi decoding, and providing quality information concerning the pre-decoded data received at the respective data rates, wherein the quality information is a symbol error rate; and a second means for estimating the rate of the received data, based on the quality information of the pre-decoded data received at the respective data rates. - View Dependent Claims (10)
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11. An apparatus for determining the rate of data received by a receiver in a variable-rate communications system, the apparatus comprising:
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a first pre-decoder for pre-decoding, without using Viterbi decoding, received data having a first data rate; a first encoder for re-encoding an output from said first pre-decoder; a first comparator for comparing the data having the first data rate with an output from said first encoder; a first counter for counting the number of errors resulting from the comparison of said first comparator; a second pre-decoder for pre-decoding received data having a second data rate; a second encoder for re-encoding an output from said second pre-decoder; a second comparator for comparing the data having the second data rate with an output from said second encoder; a second counter for counting the number of errors resulting from the comparison of said second comparator; and a decision unit for deciding which of the data received from said first and second counters has the least symbol error rate. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A variable-rate communications system capable of determining a data reception rate, comprising:
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a first pre-decoder which receives data at a first data rate and pre-decodes the data, without using Viterbi decoding;
a first encoder which receives an output from said first pre-decoder and re-encodes the pre-decoded data;a first comparator which receives and compares the re-encoded data from said first encoder and the data having the first data rate; a first counter which receives an output from said first comparator and counts the number of errors resulting from the comparison;
a second pre-decoder which receives data at a second data rate and pre-decodes the data;
a second encoder which receives an output from said second pre-decoder and re-encodes the pre-decoded data;a second comparator which receives and compares the re-encoded data from said second encoder and the data having the second data rate; a second counter which receives an output from said second comparator and counts the number of errors resulting from the comparison; and a decision unit which receives an output from said first and second counters and decides which data rate has the least symbol error rate. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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Specification