Forward error correction scheme for data channels using universal turbo codes
A method of providing forward error correction for data services uses a parallel concatenated convolutional code which is a Turbo Code comprising a plurality of eight-state constituent encoders wherein a plurality of data block sizes are used in conjunction with said Turbo Code. A variation uses the method in a cellular radio system. Another variation uses the method in both forward and reverse likes of a cellular radio system.
1. A data signal, embodied in a carrier wave generated by a wireless telephony apparatus, comprising:
data that has been encoded by a Turbo encoder including a plurality of constituent encoders, each adapted to encode data using a convolutional code,
wherein at least one of the plurality of constituent encoders has a transfer function of:
G(D)=[1, (1+D+D 3 )/(1+D 2 +D 3 )], wherein D denotes unit delay in presentation or data bits to the encoder.
2. The data signal of claim 1 , wherein the data has been encoded using the Turbo encoder with a coding rate equal to 1/3.
3. A data signal, embodied in a carrier wave generated by a wireless telephony apparatus, comprising:
data that has been encoded by a Turbo encoder including a plurality of constituent encoders, each adapted to encode data using a convolutional code,
wherein at least one of the plurality of constituent encoders has a transfer function of:
G(D)=[1, (1+D+D 3 )/d(D)], wherein D denotes unit delay in presentation of data bits to the encoder.
4. The data signal of claim 3 , wherein d(D)=(1+D 2 +D 3 ).
5. The data signal of claim 3 , wherein the data has been encoded using the Turbo encoder with a coding rate equal to 1/3.
6. A data signal, embodied in a carrier wave generated by a wireless telephony apparatus, comprising:
data that has been encoded by a Turbo encoder including a plurality of constituent encoders, each adapted to encode data with a convolutional code,
wherein at least one of the plurality of constituent encoders has a transfer function of:
G(D)=[1, (1+D+D 3 )/(1+D 2 +D 3 ), (1+D+D 2 +D 3 )/(1+D 2 +D 3 )], wherein D denotes unit delay in presentation of data bits to the encoder.
7. The data signal of claim 6 , wherein the data has been encoded using the Turbo encoder with the data rate equal to 1/2.
8. The data signal of claim 6 , wherein the data has been encoded using the Turbo encoder with the data rate equal to 1/3.
9. The data signal of claim 6 , wherein the data has been encoded using the Turbo encoder with a coding rate equal to 1/4.
10. A data signal, embodied in a carrier wave generate by a wireless telephony apparatus, comprising:
data that has been encoded by a Turbo encoder including a plurality of constituent encoders, each encoder adapted to encode data with a convolutional code,
wherein at least one of the plurality of constituent encoders has a transfer function of:
G(D)=[1, n x (D)/d(D), n y (D)/d(D)], wherein n x and n y are polynomials specifying feed forward connections and d(D)=(1+D 2 +D 3 ); wherein D denotes unit delay in presentation of data bits to the encoder.
11. The data signal of claim 10 , wherein the data has been encoded using the Turbo encoder with a coding rate equal to 1/2.
12. The data signal of claim 10 , wherein the data has been encoded using the Turbo encoder with a coding rate equal to 1/3.
13. The data signal of claim 10 , wherein the data has been encoded using the Turbo encoder with a coding rate equal to 1/4.