Channel delay spread adaptive equalization and decoding
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorBertrand Penther
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Abstract
The invention relates to a method for equalizing symbols received from a transmission channel and for decoding data therefrom, the method being by performing either a first processing comprising a turboequalizing sequence on the received symbols or a second processing comprising an equalizing step followed by a turbodecoding sequence, the selection of the first or the second processing being made upon an estimation of the delay spread of the transmission channel.
Claims18
A method for equalizing symbols received from a transmission channel and for decoding data therefrom, comprising:
- performing one of a first processing, which includes performing a turboequalizing sequence on the received symbols and a second processing, which includes equalizing the received symbols and applying a turbodecoding sequence to the received symbols;
- and
- performing the first processing when a value of a delay spread of the transmission channel rises above a first threshold and performing the second processing when the value of the delay spread falls under a second threshold.
A method for coding data, comprising:
- performing either a first processing, which includes,
- coding the data using a convolutional code that includes a variable constraint length, and
- interleaving the data, or
- performing a second processing, which includes turbocoding said data,
- wherein the selection of the first or the second processing is made upon information relative to the delay spread of the transmission channel.
A receiver comprising:
- a processing device configured to perform one of a turboequalizing sequence on received symbols, and equalizing of received symbols along with a turbodecoding sequence on the received symbols,
- wherein the turboequalizing sequence is performed when a value of a delay spread of a transmission channel rises above a first threshold and equalize received symbols and perform a turbocoding sequence on the received symbols is performed when the value of the delay spread falls under a second threshold.
A transmitter comprising:
- a processing device configured to perform one of turbocode data, and interleave data and code data, wherein the code is a convolutional code that includes a variable constraint length,
- means for selecting of turbocode data, and interleave data and code data is made upon information relative to a delay spread of a transmission channel.
A telecommunications system comprising:
- a transmitter and a receiver, the transmitter including
- a processing device configured to perform one of turbocode data, and interleave data and code data, wherein the code is a convolutional code that includes a variable constraint length,
- wherein a selection of turbocode data, and interleave data and code data is made upon information relative to a delay spread of a transmission channel, the receiver including
- a processing device configured to perform one of a turboequalizing sequence on received symbols, and equalizing received symbols along with a turbodecoding sequence on the received symbols,
- wherein the turboequalizing sequence is performed when a value of a delay spread of a transmission channel rises above a first threshold and equalize received symbols and perform a turbocoding sequence on the received symbols is performed when the value of the delay spread falls under a second threshold,
- wherein the receiver sends back to the transmitter said information relative to a delay spread of a transmission channel.
Dependencies are inferred from the claim text.