Fine step blended modulation communications

Patent metadata

Field	Value
Publication number	US-9692624-B2
Application number	US-201514723695-A
Country	US
Kind code	B2
Filing date	May 28, 2015
Priority date	Dec 21, 2012
Publication date	Jun 27, 2017
Grant date	Jun 27, 2017

Abstract

A communication device is configured to perform symbol mapping of bits to generate modulation symbols using one or more modulations. The device may employ a blended modulation composed of bit labels or symbols having different numbers of bits per symbol and different modulations. For example, the device may symbol map bit labels/symbols having first number of bits per symbol to first modulation, and the device may symbol map labels/symbols having second number of bits per symbol to second modulation. The device may be configured to perform forward error correction (FEC) or error correction code (ECC) and coding of information bits to generate coded bits that subsequently undergo symbol mapping. The device may be configured to operate based on different operational modes based on substantially uniform steps of rates, or bits per symbol, and energy per bit or symbol to noise spectral density ratio (E b /N 0 or E s /N 0 ).

First claim

What is claimed is:

1. A communication device comprising:
a communication interface; and
a processor, at least one of the processor or the communication interface configured to:
select a blended modulation from a plurality of blended modulations based on a desired energy per bit to noise spectral density ratio (E b /N 0 ) or symbol to noise spectral density ratio (E s /N 0 ), wherein each of the plurality of blended modulations has a different respective energy per bit to noise spectral density ratio (E b /N 0 ) or symbol to noise spectral density ratio (E s /N 0 ) than other of the plurality of blended modulations, wherein the blended modulation is a combination of at least two modulations, and wherein each of the at least two modulations includes a respective set of bit labels for a respective set of constellation points therein;
map a plurality of bits to the blended modulation to generate a modulation symbol; and
transmit the modulation symbol to another communication device.

2. The communication device of claim 1 , wherein the at least one of the processor or the communication interface is further configured to:
map the plurality of bits to the blended modulation to generate the modulation symbol that is the combination of the at least two modulations to generate the modulation symbol and transmit the modulation symbol to the another communication device at or during a first time; and
map another plurality of bits to another blended modulation to generate another modulation symbol that is another combination of another at least two other modulations to generate another modulation symbol and transmit the another modulation symbol to the another communication device or at least one other communication device at or during a second time, wherein the blended modulation and the another blended modulation are spaced by substantially uniform steps of energy per bit to noise spectral density ratio (E b /N 0 ) or symbol to noise spectral density ratio (E s /N 0 ).

3. The communication device of claim 1 , wherein the at least one of the processor or the communication interface is further configured to:
select the blended modulation that is the combination of the at least two modulations associated with a first operational mode based on at least one of a first rate supported by a communication channel between the communication device and the another communication device, a first bits per symbol supported by the communication channel between the communication device and the another communication device, a first energy per bit to noise spectral density ratio (E b /N 0 ) supported by the communication channel between the communication device and the another communication device, a first symbol to noise spectral density ratio (E s /N 0 ) supported by the communication channel between the communication device and the another communication device, a first local operating condition of the communication device, a first remote operating condition of the another communication device, or a first control signal received from the another communication device;
select another blended modulation that is another combination of another at least two modulations associated with a second operational mode based on at least one of a second rate supported by the communication channel between the communication device and the another communication device, a second bits per symbol supported by the communication channel between the communication device and the another communication device, a second E b /N 0 supported by the communication channel between the communication device and the another communication device, a second E s /N 0 supported by the communication channel between the communication device and the another communication device, a second local operating condition of the communication device, a second remote operating condition of the another communication device, or a second control signal received from the another communication device;
map the plurality of bits to the blended modulation to generate the modulation symbol and transmit the modulation symbol to the another communication device when operating based on the first operational mode; and
map another plurality of bits to the blended modulation to generate another modulation symbol and transmit the another modulation symbol to the another communication device or at least one other communication device when operating based on the second operational mode.

4. The communication device of claim 1 , wherein the at least one of the processor or the communication interface is further configured to:
encode at least one information bit based on at least one of a forward error correction (FEC) code or an error correction code (ECC) to generate a plurality of encoded bits; and
generate the plurality of bits based on at least one of the plurality of encoded bits.

5. The communication device of claim 4 , wherein the at least one of the FEC code or the ECC is based on at least one of convolutional, turbo, turbo trellis coded modulation (TTCM), low density parity check (LDPC), Reed-Solomon (RS), or BCH (Bose and Ray-Chaudhuri, and Hocquenghem) coding.

6. The communication device of claim 1 , wherein the at least two modulations includes at least one of a quadrature phase shift keying (QPSK) modulation, a 4-quadrature amplitude modulation (QAM) modulation, an 8 phase shift keying (8-PSK) modulation, a 16 QAM modulation, or a 32 quadrature amplitude modulation (QAM) modulation.

7. The communication device of claim 1 further comprising:
a cable modem, wherein the another communication device is a cable headend transmitter or a cable modem termination system (CMTS).

8. The communication device of claim 1 , wherein the at least one of the processor or the communication interface is further configured to:
support communications within at least one of a satellite communication system, a wireless communication system, a wired communication system, a fiber-optic communication system, or a mobile communication system.

9. A communication device comprising:
a communication interface; and
a processor configured to:
select a first blended modulation based on a first desired energy per bit to noise spectral density ratio (E b /N 0 ) or symbol to noise spectral density ratio (E s /N 0 );
select a second blended modulation from a plurality of blended modulations based on a second desired energy per bit to noise spectral density ratio (E b /N 0 ) or symbol to noise spectral density ratio (E s /N 0 ), wherein each of the plurality of blended modulations has a different respective energy per bit to noise spectral density ratio (E b /N 0 ) or symbol to noise spectral density ratio (E s /N 0 ) than other of the plurality of blended modulations;
map a first plurality of bits to the first blended modulation that is a first combination of a first at least two modulations selected from a plurality of modulations to generate a first modulation symbol, wherein each of the first at least two modulations includes a respective set of bit labels for a respective set of constellation points therein;
map a second plurality of bits to the second blended modulation that is a second combination of a second at least two modulations selected from the plurality of modulations to generate a second modulation symbol, wherein each of the second at least two modulations includes another respective set of bit labels for another respective set of constellation points therein;
transmit the first modulation symbol to a first other communication device; and
transmit the second modulation symbol to at least one of the first other communication device or a second other communication device.

10. The communication device of cla

Assignees

• Broadcom Corp
• Avago Technologies General Ip

Inventors

• Kolze Thomas J
• Currivan Bruce J

Classifications

• H04L27/362

  Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated (H04L27/366 takes precedence) · CPC title

• H04L1/24

  Testing correct operation · CPC title

• H04L1/0015

  characterised by the adaptation strategy · CPC title

• H04L1/0003

  by switching between different modulation schemes · CPC title

• H04L27/0008 Primary

  arrangements for allowing a transmitter or receiver to use more than one type of modulation (negotiating modulation type for two-way transmission paths H04L5/1453) · CPC title