Lower complexity layered modulation signal processor

• US 7,706,466 B2
• Filed: 12/05/2008
• Issued: 04/27/2010
• Est. Priority Date: 04/27/2001
• Status: Expired due to Fees

• Current Assignee: The DIRECTV Group, Inc. (AT&T, Inc.)
• Original Assignee: The DIRECTV Group, Inc. (AT&T, Inc.)
• Inventors: Lin, Tung-Sheng, Zhou, Guangcai, Wang, Weizheng W., Santoru, Joseph, Chen, Ernest C.
• Primary Examiner(s): Bayard; Emmanuel
• Application Number:
  US12/329,456
• Publication Number:
  US 20090097589A1
• Time in Patent Office: 508 Days
• Field of Search: 375/265, 375/267, 375/295, 375/299, 375/349, 375/347
• US Class Current: 375/295
• CPC Class Codes: H04B 17/318 Received signal strength
• CPC Class Codes: H04B 7/18515 Transmission equipment in satellites or space-based relays
• CPC Class Codes: H04L 1/20 using signal quality detector
• CPC Class Codes: H04L 2027/0061 remodulation
• CPC Class Codes: H04L 27/183 Multiresolution systems
• CPC Class Codes: H04L 27/227 using coherent demodulation
• CPC Class Codes: H04L 27/3488 Multiresolution systems
• CPC Class Codes: H04L 27/366 Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator

Abstract

A method and apparatus for transmitting and receiving a coded signal having an upper layer signal and a lower layer signal is disclosed. The method comprises the steps of combining the upper layer signal and the lower layer signal, encoding the combined upper layer signal and lower layer signal, delaying the upper layer signal, modulating the delayed upper layer signal, modulating the lower layer signal, transmitting the delayed upper layer signal and transmitting the lower layer signal. The apparatus comprises an encoder, for encoding a combined upper layer signal and lower layer signal, a delay, communicatively coupled to the encoder, for delaying the upper layer signal, a first modulator, for modulating the delayed upper layer signal, a second modulator, for modulating the lower layer signal, a transmitter, communicatively coupled to the first modulator, for transmitting the delayed upper layer signal, and a second transmitter, communicatively coupled to the second modulator.

Claims

1. A method of transmitting a coded signal having an upper layer signal and a lower layer signal, comprising the steps of:

multiplexingly applying the upper layer signal and lower layer signal to an encoder to separately encode the upper layer signal and the lower layer signal;

modulating, in a first modulator, the separately encoded upper layer signal;

modulating, in a second modulator, the separately encoded lower layer signal;

transmitting, in a first transmitter, the modulated and separately encoded upper layer signal; and

transmitting, in a second transmitter, the modulated and separately encoded lower layer signal.

2. The method of claim 1, wherein the upper layer signal and the lower layer signal are encoded by the same code.

3. The method of claim 1, wherein the step of multiplexingly applying the upper layer signal and lower layer signal to an encoder comprises the step of alternately applying the upper layer signal and the lower layer signal to an encoder.

4. The method of claim 1, wherein:

the upper layer signal is a legacy upper layer signal receivable by a plurality of legacy receivers and a plurality of layered modulation receivers;

the lower layer signal is non-coherently layered over the legacy upper layer signal; and

the lower layer signal is receivable by the plurality of layered modulation receivers and not receivable by the plurality of legacy receivers.

5. An apparatus for transmitting a coded signal having an upper layer signal and a lower layer signal, comprising:

means multiplexingly applying the upper layer signal and lower layer signal to an encoder to separately encode the upper layer signal and the lower layer signal;

means for modulating the separately encoded upper layer signal;

means for modulating the separately encoded lower layer signal;

means for transmitting the modulated and separately encoded upper layer signal; and

means for transmitting the modulated and separately encoded lower layer signal.

6. The apparatus of claim 5, wherein the upper layer signal and the lower layer signal are encoded by the same code.

7. The apparatus of claim 5, wherein the means for multiplexingly applying the upper layer signal and lower layer signal to an encoder comprises means for alternately applying the upper layer signal and the lower layer signal to an encoder.

8. The apparatus of claim 5, wherein:

the upper layer signal is a legacy upper layer signal receivable by a plurality of legacy receivers and a plurality of layered modulation receivers;

the lower layer signal is non-coherently layered over the legacy upper layer signal; and

the lower layer signal is receivable by a layered modulation receivers and not receivable by the legacy receivers.

9. An apparatus for transmitting a coded signal having an upper layer signal and a lower layer signal, comprising:

a multiplexer for separately and multiplexingly applying the upper layer signal and lower layer signal to an encoder;

a modulator, communicatively coupled to the encoder, for modulating the separately encoded upper layer signal;

a second modulator, communicatively coupled to the encoder, for modulating the separately encoded lower layer signal;

a transmitter, communicatively coupled to the modulator, the transmitter for transmitting the modulated and separately encoded upper layer signal; and

a second transmitter, coupled to the second modulator, the second transmitter for transmitting the modulated and separately encoded lower layer signal.

10. The apparatus of claim 9, wherein the upper layer signal and the lower layer signal are encoded by the same code.