Reallocation of excess power for full channel-state information (CSI) multiple-input, multiple-output (MIMO) systems

A method for allocating transmit power to a plurality of spatial subchannels in a multiple-input multiple-output (MIMO) communication system, comprising:

• defining a set of one or more spatial subchannels to be allocated transmit power;
• determining a total transmit power available to allocate to the spatial subchannels in the set;
• allocating the total transmit power to the spatial subchannels in the set based on a particular allocation scheme;
• identifying spatial subchannels in a saturation region resulting from the allocated transmit power;
• reallocating each spatial subchannel in the saturation region with a revised amount of transmit power;
• determining a total excess transmit power for all spatial subchannels reallocated with revised amounts of transmit power;
• and
• performing the defining, determining, allocating, identifying, and reallocating for one or more iterations, wherein the set of spatial subchannels for a first iteration includes the plurality of spatial subchannels and for each subsequent iteration includes spatial subchannels not in the saturation region, and wherein the total transmit power available for each subsequent iteration includes the total excess transmit power determined in a current iteration.

A method for allocating transmit power to a plurality of transmission channels in a wireless communication system, comprising:

• identifying a first set of transmission channels to be allocated transmit power;
• determining a total transmit power available to allocate to the transmission channels in the first set;
• allocating the total transmit power to the transmission channels in the first set based on a particular allocation scheme;
• identifying a second set of one or more transmission channels allocated excessive transmit power for preferred operating points;
• allocating each transmission channel in the second set with a revised amount of transmit power to achieve the preferred operating point;
• determining a total excess power for all transmission channels in the second set;
• identifying a third set of one or more transmission channels capable of supporting higher preferred operating points;
• and
• reallocating the total excess power to the one or more transmission channels in the third set.

A memory communicatively coupled to a digital signal processing device (DSPD) capable of interpreting digital information to:

• define a set of one or more transmission channels to be allocated transmit power;
• determine a total transmit power available to allocate to the transmission channels in the set;
• allocate the total transmit power to the transmission channels in the set based on a particular allocation scheme;
• identify transmission channels in a saturation region resulting from the allocated transmit power;
• reallocate each transmission channel in the saturation region with a revised amount of transmit power;
• determine a total excess transmit power for all transmission channels reallocated with revised amounts of transmit power;
• and
• perform the define, determine, allocate, identify, and reallocate for one or more iterations, wherein the set of transmission channels for a first iteration includes a plurality of transmission channels in a wireless communication system and for each subsequent iteration includes transmission channels not in the saturation region, and wherein the total transmit power available for each subsequent iteration includes the total excess transmit power determined in a current iteration.

A computer program product for allocating transmit power to a plurality of transmission channels in a wireless communication system, comprising:

• code for defining a set of one or more transmission channels to be allocated transmit power;
• code for determining a total transmit power available to allocate to the transmission channels in the set;
• code for allocating the total transmit power to the transmission channels in the set based on a particular allocation scheme;
• code for identifying transmission channels in a saturation region resulting from the allocated transmit power;
• code for reallocating each transmission channel in the saturation region with a revised amount of transmit power;
• code for determining a total excess transmit power for all transmission channels reallocated with revised amounts of transmit power;
• code for performing the defining, determining, allocating, identifying, and reallocating for one or more iterations, wherein the set of transmission channels for a first iteration includes the plurality of transmission channels and for each subsequent iteration includes transmission channels not in the saturation region, and wherein the total transmit power available for each subsequent iteration includes the total excess transmit power determined in a current iteration;
• and
• a computer-usable medium for storing the codes.

An apparatus in a wireless communication system, comprising:

• means for defining a set of one or more transmission channels to be allocated transmit power;
• means for determining a total transmit power available to allocate to the transmission channels in the set;
• means for allocating the total transmit power to the transmission channels in the set based on a particular allocation scheme;
• means for identifying transmission channels in a saturation region resulting from the allocated transmit power;
• means for reallocating each transmission channel in the saturation region with a revised amount of transmit power;
• means for determining a total excess transmit power for all transmission channels reallocated with revised amounts of transmit power;
• and
• means for performing the defining, determining, allocating, identifying, and reallocating for one or more iterations, wherein the set of transmission channels for a first iteration includes the plurality of transmission channels and for each subsequent iteration includes transmission channels not in the saturation region, and wherein the total transmit power available for each subsequent iteration includes the total excess transmit power determined in a current iteration.

A controller in a wireless communication system, comprising:

• means for defining a set of one or more transmission channels to be allocated transmit power;
• means for determining a total transmit power available to allocate to the transmission channels in the set;
• means for allocating the total transmit power to the transmission channels in the set based on a particular allocation scheme;
• means for identifying transmission channels in a saturation region resulting from the allocated transmit power;
• means for reallocating each transmission channel in the saturation region with a revised amount of transmit power;
• means for determining a total excess transmit power for all transmission channels reallocated with revised amounts of transmit power;
• and
• means for performing the defining, determining, allocating, identifying, and reallocating for one or more iterations, wherein the set of transmission channels for a first iteration includes the plurality of transmission channels and for each subsequent iteration includes transmission channels not in the saturation region, and wherein the total transmit power available for each subsequent iteration includes the total excess transmit power determined in a current iteration.

A controller in a wireless communication system, comprising:

• means for identifying a first set of transmission channels to be allocated transmit power;
• means for determining a total transmit power available to allocate to the transmission channels in the first set;
• means for allocating the total transmit power to the transmission channels in the first set based on a particular allocation scheme;
• means for identifying a second set of one or more transmission channels allocated excessive transmit power for preferred operating points;
• means for allocating each transmission channel in the second set with a revised amount of transmit power to achieve the preferred operating point;
• means for determining a total excess power for all transmission channels in the second set;
• means for identifying a third set of one or more transmission channels capable of supporting higher preferred operating points;
• and
• means for reallocating the total excess power to the one or more transmission channels in the third set.

A transmitter unit in a wireless communication system, comprising:

• a transmit (TX) data processor operative to code data for a plurality of transmission channels based on one or more coding and modulation schemes to provide a plurality of streams of symbols;
• a plurality of transmitters operative to process the plurality of symbol streams to provide a plurality of modulated signals suitable for transmission over a communication channel;
• and
• a controller operative to allocate transmit power to the plurality of transmission channels by
• defining a set of one or more transmission channels to be allocated transmit power,
• determining a total transmit power available to allocate to the transmission channels in the set,
• allocating the total transmit power to the transmission channels in the set based on a particular allocation scheme,
• identifying transmission channels in a saturation region resulting from the allocated transmit power,
• reallocating each transmission channel in the saturation region with a revised amount of transmit power,
• determining a total excess transmit power for all transmission channels reallocated with revised amounts of transmit power, and
• performing the defining, determining, allocating, identifying, and reallocating for one or more iterations, wherein the set of transmission channels for a first iteration includes the plurality of transmission channels and for each subsequent iteration includes transmission channels not in the saturation region, and wherein the total transmit power available for each subsequent iteration includes the total excess transmit power determined in a current iteration.

A receiver unit in a wireless communication system, comprising:

• a receive (RX) MIMO processor operative to receive and process a plurality of streams of samples to provide a plurality of steams of received symbols, and to derive channel state information (CSI) for a plurality of transmission channels used for the plurality of received symbol streams;
• and
• a RX data processor operative to process the plurality of received symbol streams in accordance with one or more demodulation and decoding schemes to provide decoded data, and
• wherein transmit power for the plurality of transmission channels is allocated based in part on the CSI by allocating a total available transmit power to the plurality of transmission channels based on a particular allocation scheme, reallocating each transmission channel in a saturation region with a revised amount of transmit power, determining a total excess transmit power for all transmission channels reallocated wit revised amounts of transmit power;
• and performing the defining, determining, allocating, identifying, and reallocating for one or mare iterations, wherein the set of transmission channels for a first iteration includes the plurality of transmission channels and for each subsequent iteration includes transmission channels not in the saturation region, and wherein the total transmit power available for each subsequent iteration includes the total excess transmit power determined in a current iteration.

A receiver apparatus in a wireless communication system, comprising:

• means for processing a plurality of streams of samples to provide a plurality of streams of received symbols, and to derive channel state information (CSI) for a plurality of transmission channels used for the plurality of received symbol streams;
• and
• means for processing the plurality of received symbol streams in accordance with one or more demodulation and decoding schemes to provide decoded data, and
• wherein transmit power for the plurality of transmission channels is allocated based in part on the CSI by allocating a total available transmit power to the plurality of transmission channels based on a particular allocation scheme, reallocating each transmission channel in a saturation region with a revised amount of transmit power, determining a total excess transmit power for all transmission channels reallocated with revised amounts of transmit power;
• and performing the defining, determining, allocating, identifying, and reallocating for one or more iterations, wherein the set of transmission channels for a first iteration includes the plurality of transmission channels and for each subsequent iteration includes transmission channels not in the saturation region, and wherein the total transmit power available for each subsequent iteration includes the total excess transmit power determined in a current iteration.