Method of transmitting data samples with reduced bandwidth

1. A method of compressing a predistorted signal for transmission from a processing node to a remote node, said method comprising:

decomposing the predistorted signal into high-dynamic range components and low-dynamic range components;

generating a high-dynamic range signal having a first sample rate and containing the high-dynamic range components;

generating a low-dynamic range signal having a second sample rate greater than the first sample rate and containing the low-dynamic range components; and

combining samples of the high-dynamic range signal with corresponding samples of the low-dynamic range signal to produce a compressed signal for transmission to the remote node.

2. The method of claim 1 , wherein decomposing the predistorted signal comprises:

removing the low-dynamic range components of the predistorted signal to obtain the high-dynamic range signal; and

subtracting the high-dynamic range signal from the predistorted signal to obtain the low-dynamic range signal.

3. The method of claim 2 , wherein removing the low-dynamic range components of the predistorted signal comprises filtering the predistorted signal.

4. The method of claim 3 , wherein generating the high-dynamic range signal having the first sample rate comprises decimating the high-dynamic range signal generated by said filtering.

5. The method of claim 1 , wherein generating the low-dynamic range signal at the second sample rate comprises:

interpolating the high-dynamic range signal to obtain an up-sampled version of the high-dynamic range signal; and

subtracting the up-sampled version of the high-dynamic range signal from the predistorted signal to obtain the low-dynamic range signal having the second sample rate.

6. The method of claim 5 , further comprising altering the sample rate of the predistorted signal to match the high-dynamic range signal before subtracting the up-sampled version of the high-dynamic range signal.

7. The method of claim 1 , wherein combining samples of the high-dynamic range signal with corresponding samples of the low-dynamic range signal to produce a compressed signal for transmission to the remote node comprises:

delaying samples of the low-dynamic range signal in a tapped delay line including a plurality of delay registers; and

periodically combining samples of the low-dynamic range signal in said delay registers with a corresponding sample of the high-dynamic range signal.

8. The method of claim 7 , wherein periodically combining samples of the low-dynamic range signal in said delay registers with a corresponding sample of the high-dynamic range signal comprises:

inputting, into a multiplexer, a sample of the high-dynamic range signal;

inputting, into said multiplexer, samples of the low-dynamic range signal in said delay registers synchronously with the sample of the high-dynamic range signal; and

multiplexing the sample of the high-dynamic range component with the corresponding samples of the low-dynamic range components to obtain the compressed signal.

9. The method of claim 1 , further comprising transmitting the compressed signal to the remote node.

10. A data compression circuit for compressing a predistorted signal for transmission from a processing node to a remote node, said method comprising:

a decomposition circuit configured to:

decompose the predistorted signal into high-dynamic range components and low-dynamic range components;

generate a high-dynamic range signal having a first sample rate for the high-dynamic range components;

generate a low-dynamic range signal having a second sample rate for the low-dynamic range components, said second sample rate being greater than the first sample rate; and

a combining circuit to combine samples of the high-dynamic range signal with corresponding samples of the low-dynamic range signal to produce a compressed signal for transmission to the remote node.

11. The data compression circuit of claim 10 , wherein decomposing the predistorted signal comprises:

removing the low-dynamic range components of the predistorted signal to obtain the high-dynamic range signal; and

subtracting the high-dynamic range signal from the predistorted signal to obtain the low-dynamic range signal.

12. The data compression circuit of claim 11 , wherein the data compression circuit comprises a filter to remove the low-dynamic range components of the predistorted signal to generate a filtered signal having the high-dynamic range components.

13. The data compression circuit of claim 12 , wherein the data compression circuit comprises a down-sampling circuit to down-sample the filtered signal output by said filter to generate the high-dynamic range signal having the first sample rate.

14. The data compression circuit of claim 10 , wherein the data compression circuit comprises:

an interpolator to up-sample the high-dynamic range signal; and

a subtractor to subtract the up-sampled version of the high-dynamic range signal from the predistorted signal to obtain the low-dynamic range signal having the second sample rate.

15. The data compression circuit of claim 14 , further comprising a sample rate converter to vary the sample rate of the predistorted signal to match the high-dynamic range signal before subtracting the up-sampled version of the high-dynamic range signal.

16. The data compression circuit of claim 10 , wherein the combining circuit comprises:

a delay circuit to delay samples of the low-dynamic range signal; and

a multiplexer to periodically combine samples of the low-dynamic range signal in said delay registers with a corresponding samples of the high-dynamic range signal.

17. The data compression circuit of claim 16 , wherein the delay circuit comprises:

a tapped delay line having a plurality of delay registers for delaying the samples of the low-dynamic range signal;

a set of switches to output samples of the low-dynamic range signal in the delay registers to the multiplexer synchronously with corresponding samples of the high-dynamic range signal.

18. The data compression circuit of claim 10 , further comprising a transmitter to transmit the compressed signal to the remote node.