Extended bandwidth homePNA system compatible with homePNA 2.0
View Patent ↗An extended bandwidth HomePNA system uses a transmit spectrum having a greater bandwidth than the bandwidth specified by a HomePNA 2.0 communication standard. The extended bandwidth system of the invention provides for additional copies of a spectrum of a 2 Mbaud training signal for better accuracy in decoding transmitted data by a receiver. In one embodiment, the extended bandwidth is a 12 MHz band centered at 10 MHz, from 4 MHz to 16 MHz. This extended bandwidth allows for three copies of a 4 Mbaud training sequence or six copies of a 2 Mbaud training sequence. The extended bandwidth of the invention is compatible with a HomePNA 2.0 system by providing a training sequence that enables a HomePNA 2.0 receiver in 2 Mbaud mode to train on the transmitted signal and determine that the transmitted signal is not intended for the HomePNA 2.0 receiver in 2 Mbaud mode.
1. An extended bandwidth HomePhoneline Network Alliance system, comprising:
a transmitter configured to transmit an extended bandwidth signal, the extended bandwidth signal having a bandwidth greater than a bandwidth of a signal that conforms to the bandwidth limitations of a HomePhoneline Networking Alliance 2.0 specification, wherein the bandwidth of the extended bandwidth signal includes more than one and one half copies of a spectrum of a 4 Million symbols per second (Mbaud) signal.
2. The system of claim 1 , wherein the extended bandwidth signal has a bandwidth of 12 MHz.
3. The system of claim 2 , wherein the 12 MHz bandwidth of the extended bandwidth signal spans the frequencies from 4 MHz to 16 MHz.
4. The system of claim 1 , wherein the bandwidth of the extended bandwidth signal is greater than 6 MHz.
5. The system of claim 1 , wherein the bandwidth of the extended bandwidth signal includes three copies of a spectrum of a 4 Million symbols per second (Mbaud) signal.
6. The system of claim 1 , wherein the bandwidth of the extended bandwidth signal includes more than three copies of a spectrum of a 2 Million symbols per second (Mbaud) signal.
7. The system of claim 1 , wherein the bandwidth of the extended bandwidth signal includes six copies of a spectrum of a 2 Million symbols per second (Mbaud) signal.
8. The system of claim 1 , wherein the spectral content of the extended bandwidth signal is such that a HomePhoneline Networking Alliance (HomePNA) 2.0 receiver in 2 Mbaud mode is able to train on the extended bandwidth signal and determine that the extended bandwidth signal is not intended for the HomePNA 2.0 receiver in 2 Mbaud mode.
9. The system of claim 1 , further comprising a transmission medium and a receiver configured to receive the extended bandwidth signal from the transmitter via the transmission medium.
10. The system of claim 9 , wherein the receiver is further configured to train on the extended bandwidth signal and to decode the extended bandwidth signal to recover data included in the extended bandwidth signal.
11. The system of claim 1 , wherein the transmitter includes a module configured to upsample a 2 Mbaud signal to an 8 Mbaud signal, a 1 MHz modulator configured to modulate the 8 Mbaud signal with a 1 MHz signal, a pulse shaping filter configured to filter the output of the 1 MHz modulator such that the filtered signal has a 12 MHz wide baseband spectrum, and a 10 MHz modulator configured to modulate the filtered signal by a 10 MHz carrier signal.
12. The system of claim 11 , wherein the module configured to upsample the 2 Mbaud signal to the 8 Mbaud signal is a zero-padder.
13. An extended bandwidth HomePNA system, comprising:
means for generating an extended bandwidth signal, the extended bandwidth signal having a bandwidth greater than a bandwidth of a signal the conforms to a HomePhoneline Networking Alliance 2.0 specification, wherein the bandwidth of the extended bandwidth signal includes more than one and one half copies of a spectrum of a 4 Million symbols per second (Mbaud) signal.
14. A method for generating a training sequence for training a receiver, comprising the steps of:
upsampling a 2 Mbaud signal to an 8 Mbaud signal;
modulating the 8 Mbaud signal with a 1 MHz signal;
filtering the modulated 8 Mbaud signal to produce a filtered signal having a 12 MHz wide baseband spectrum; and
modulating the filtered signal with a 10 MHz carrier signal to produce the training sequence.
15. The method of claim 14 , wherein the step of upsampling includes inserting three zeros after each symbol in the 2 Mbaud sequence.
16. The method of claim 14 , wherein the receiver is configured to train on a HomePhoneline Networking Alliance 2.0 training sequence.
17. The method of claim 14 , wherein the receiver is configured to train on an extended bandwidth HomePhoneline Networking Alliance training sequence.
18. The method of claim 14 , wherein the training sequence has a spectrum that includes six copies of a spectrum of the 2 Mbaud signal.
19. The method of claim 14 , wherein a first half of a spectrum of the training sequence spans a frequency range that matches a frequency range of a HomePhoneline Networking Alliance 2.0 specification.