Off-line broadband network interface
View Patent ↗A network interface is presented that receives packet data from a shared medium and accomplishes the signal processing required to convert the data packet to host computer formatted data separately from receiving the data packet. The network interface receives the data packet, converts the analog signal to a digitized signal, and stores the resulting sample packet in a storage queue. An off-line processor, which may be the host computer itself, performs the signal processing required to interpret the sample packet. In transmission, the off-line process converts host-formatted data to a digitized version of a transmission data packet and stores that in a transmission queue. A transmitter converts the transmission data packet format and transmits the data to the shared medium.
1. A method of analyzing a destination of a data packet, comprising:
constructing a channel estimate based on a training sequence received in the data packet;
convolving the channel estimate with each of a set of host addresses to form a set of convolved addresses;
comparing the set of convolved addresses with a segment of the received signals of the data packet corresponding to an address field.
2. The method of claim 1 wherein the training sequence and the address field are modulated using carrierless amplitude-phase modulation.
3. The method of claim 1 wherein the training sequence and the address field are modulated using quadrature amplitude modulation.
4. The method of claim 1 , wherein the training sequence is a periodic sequence with period N where N is greater than a maximum channel length.
5. The method of claim 4 , wherein N is a power of 2.
6. The method of claim 5 wherein the training sequence and the address field are modulated using carrierless amplitude-phase modulation.
7. The method of claim 5 wherein the training sequence and the address field are modulated using quadrature amplitude modulation.
8. The method of claim 4 , wherein N=8 and the training sequence comprises a sequence of QPSK symbols.
9. The method of claim 8 wherein the training sequence and the address field are modulated using carrierless amplitude-phase modulation.
10. The method of claim 8 wherein the training sequence and the address field are modulated using quadrature amplitude modulation.
11. The method of claim 4 , wherein N=16 and the training sequence comprises a sequence of QPSK symbols.
12. The method of claim 11 wherein the training sequence and the address field are modulated using carrierless amplitude-phase modulation.
13. The method of claim 11 wherein the training sequence and the address field are modulated using quadrature amplitude modulation.
14. The method of claim 4 , wherein N=32 and the training sequence comprises a sequence of 8-PSK symbols.
15. The method of claim 14 wherein the training sequence and the address field are modulated using carrierless amplitude-phase modulation.
16. The method of claim 14 wherein the training sequence and the address field are modulated using quadrature amplitude modulation.
17. The method of claim 4 , wherein N=64 and the training sequence comprises a sequence of 8-PSK symbols.
18. The method of claim 17 wherein the training sequence and the address field are modulated using carrierless amplitude-phase modulation.
19. The method of claim 17 wherein the training sequence and the address field are modulated using quadrature amplitude modulation.
20. The method of claim 4 , wherein N=4 and the training sequence comprises a sequence of BPSK symbols.
21. The method of claim 20 wherein the training sequence and the address field are modulated using carrierless amplitude-phase modulation.
22. The method of claim 20 wherein the training sequence and the address field are modulated using quadrature amplitude modulation.
23. The method of claim 4 wherein the training sequence and the address field are modulated using carrierless amplitude-phase modulation.
24. The method of claim 4 wherein the training sequence and the address field are modulated using quadrature amplitude modulation.