Multi-carrier communication systems employing variable symbol rates and number of carriers

A method of communicating between a transmitter and a receiver in a wireless multi-carrier system comprising the steps of:

• setting in the transmitter an initial number of carriers and an initial symbol rate at which symbols are transmitted from the transmitter to the receiver;
• transmitting a first group of symbols using the initial number of carriers and the initial symbol rate;
• changing in the transmitter the number of carriers in active use from the initial number of carriers to a subsequent number of carriers that is different than the initial number of carriers;
• and
• transmitting a second group of symbols using the subsequent number of carriers,
• wherein the step of changing in the transmitter the number of carriers in active use includes the step of dynamically informing the transmitter of those carriers that were used in the initial number of carriers and will not be used in the subsequent number of carriers by placing zero magnitude signals on those carriers within the transmitter, wherein each carrier is individually selected to be used/not used.

A method of communicating between a transmitter and a receiver in a wireless multi-carrier system comprising the steps of:

• setting in the transmitter an initial number of carriers and an initial symbol rate at which symbols are transmitted from the transmitter to the receiver;
• transmitting a first group of symbols using the initial number of carriers and the initial symbol rate;
• changing in the transmitter the number of carriers in active use from the initial number of carriers to a subsequent number of carriers that is different than the initial number of carriers;
• and
• transmitting a second group of symbols using the subsequent number of carriers,
• wherein the step of changing in the transmitter the number of carriers in active use includes the step of dynamically informing the transmitter of those carriers that were not used in the initial number of carriers and will be used in the subsequent number of carriers by placing data conveying signals into those carriers that previously had zero magnitude signals within the transmitter, wherein each carrier is individually selected to be used/not used.

A method of communicating between a transmitter and a receiver in a wireless multi-carrier system comprising the steps of:

• setting in the transmitter an initial number of carriers and an initial symbol rate at which symbols are transmitted from the transmitter to the receiver;
• transmitting a first group of symbols using the initial number of carriers and the initial symbol rate;
• changing in the transmitter the number of carriers in active use from the initial number of carriers to a subsequent number of carriers that is different than the initial number of carriers;
• and
• transmitting a second group of symbols using the subsequent number of carriers,
• wherein the step of changing in the transmitter the number of carriers in active use includes the step of changing an iFFT size of an iFFT in the transmitter by a factor that is a power of two, and
• wherein the step of changing in the transmitter the number of carriers in active use further includes the step of dynamically informing the transmitter of those carriers that were used in the initial number of carriers and will not be used in the subsequent number of carriers by placing zero magnitude signals on those carriers within the transmitter, wherein each carrier is individually selected to be used/not used.

A method of communicating between a transmitter and a receiver in a wireless multi-carrier system comprising the steps of:

• setting in the transmitter an initial number of carriers and an initial symbol rate at which symbols are transmitted from the transmitter to the receiver;
• transmitting a first group of symbols using the initial number of carriers and the initial symbol rate;
• changing in the transmitter the number of carriers in active use from the initial number of carriers to a subsequent number of carriers that is different than the initial number of carriers;
• and
• transmitting a second group of symbols using the subsequent number of carriers,
• wherein the step of changing in the transmitter the number of carriers in active use includes the step of changing an iFFT size of an iFFT in the transmitter by a factor that is a power of two, and
• wherein the step of changing in the transmitter the number of carriers in active use further includes the step of dynamically informing the transmitter of those carriers that were not used in the initial number of carriers and will be used in the subsequent number of carriers by placing data conveying signals into those carriers that previously had zero magnitude signals within the transmitter, wherein each carrier is individually selected to be used/not used.

A method of communicating between a transmitter and a receiver in a wireless multi-carrier system comprising the steps of:

• setting in the transmitter an initial number of carriers and an initial symbol rate at which symbols are transmitted from the transmitter to the receiver;
• transmitting a first group of symbols using the initial number of carriers and the initial symbol rate;
• changing in the transmitter the rate at which symbols are transmitted from the transmitter to the receiver from the initial symbol rate to a subsequent symbol rate that is different than the initial symbol rate;
• changing in the transmitter the number or carriers in active use from the initial number of carriers to a subsequent number of carriers that is different than the initial number of carriers;
• and
• transmitting a second group of symbols using the subsequent number of carriers and the subsequent symbol rate,
• wherein the step of changing the rate at which symbols are transmitted includes the step of changing a frequency that is used to clock a serial to parallel converter, a divide by N counter coupled to an iFFT, and a parallel to serial converter by changing a multiplexer output, thereby selecting a different circuit capable of generating the subsequent symbol rate rather than a previous circuit capable of generating the initial symbol rate.

A method of communicating between a transmitter and a receiver in a wireless multi-carrier system comprising the steps of:

• setting in the transmitter an initial number of carriers and an initial symbol rate at which symbols are transmitted from the transmitter to the receiver;
• transmitting a first group of symbols using the initial number of carriers and the initial symbol rate;
• changing in the transmitter the rate at which symbols are transmitted from the transmitter to the receiver from the initial symbol rate to a subsequent symbol rate that is different than the initial symbol rate;
• changing in the transmitter the number or carriers in active use from the initial number of carriers to a subsequent number of carriers that is different than the initial number of carriers;
• and
• transmitting a second group of symbols using the subsequent number of carriers and the subsequent symbol rate,
• wherein the step of changing in the transmitter the number of carriers in active use includes the step of dynamically informing the transmitter of those carriers that were used in the initial number of carriers and will not be used in the subsequent number of carriers by placing zero magnitude signals on those carriers within the transmitter, wherein each carrier is individually selected to be used/not used.

A method of communicating between a transmitter and a receiver in a wireless multi-carrier system comprising the steps of:

• setting in the transmitter an initial number of carriers and an initial symbol rate at which symbols are transmitted from the transmitter to the receiver;
• transmitting a first group of symbols using the initial number of carriers and the initial symbol rate;
• changing in the transmitter the rate at which symbols are transmitted from the transmitter to the receiver from the initial symbol rate to a subsequent symbol rate that is different than the initial symbol rate;
• changing in the transmitter the number or carriers in active use from the initial number of carriers to a subsequent number of carriers that is different than the initial number of carriers;
• and
• transmitting a second group of symbols using the subsequent number of carriers and the subsequent symbol rate,
• wherein the step of changing in the transmitter the number of carriers in active use includes the step of dynamically informing the transmitter of those carriers that were not used in the initial number of carriers and will be used in the subsequent number of carriers by placing data conveying signals into those carriers that previously had zero magnitude signals within the transmitter, wherein each carrier is individually selected to be used/not used.

A method of communicating between a transmitter and a receiver in a wireless multi-carrier system comprising the steps of:

• setting in the transmitter an initial number of carriers and an initial symbol rate at which symbols are transmitted from the transmitter to the receiver;
• transmitting a first group of symbols using the initial number of carriers and the initial symbol rate;
• changing in the transmitter the rate at which symbols are transmitted from the transmitter to the receiver from the initial symbol rate to a subsequent symbol rate that is different than the initial symbol rate;
• changing in the transmitter the number or carriers in active use from the initial number of carriers to a subsequent number of carriers that is different than the initial number of carriers;
• and
• transmitting a second group of symbols using the subsequent number of carriers and the subsequent symbol rate,
• wherein the step of changing in the transmitter the number of carriers in active use includes the step of changing an iFFT size of an iFFT in the transmitter by a factor that is a power of two, and
• wherein the step of changing in the transmitter the number of carriers in active use further includes the step of dynamically informing the transmitter of those carriers that were used in the initial number of carriers and will not be used in the subsequent number of carriers by placing zero magnitude signals on those carriers within the transmitter, wherein each carrier is individually selected to be used/not used.

A method of communicating between a transmitter and a receiver in a wireless multi-carrier system comprising the steps of:

• setting in the transmitter an initial number of carriers and an initial symbol rate at which symbols are transmitted from the transmitter to the receiver;
• transmitting a first group of symbols using the initial number of carriers and the initial symbol rate;
• changing in the transmitter the rate at which symbols are transmitted from the transmitter to the receiver from the initial symbol rate to a subsequent symbol rate that is different than the initial symbol rate;
• changing in the transmitter the number or carriers in active use from the initial number of carriers to a subsequent number of carriers that is different than the initial number of carriers;
• and
• transmitting a second group of symbols using the subsequent number of carriers and the subsequent symbol rate,
• wherein the step of changing in the transmitter the number of carriers in active use includes the step of changing an iFFT size of an iFFT in the transmitter by a factor that is a power of two, and
• wherein the step of changing in the transmitter the number of carriers in active use further includes the step of dynamically informing the transmitter of those carriers that were not used in the initial number of carriers and will be used in the subsequent number of carriers by placing data conveying signals into those carriers that previously had zero magnitude signals within the transmitter, wherein each carrier is individually selected to be used/not used.