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A multi-carrier communication system such as an OFDM or DMT system has nodes which are allowed to dynamically change their receive and transmit symbol rates, and the number of carriers within their signals. Changing of the symbol rate is done by changing the clocking frequency of the nodes' iFFT and

A multi-carrier communication system such as an OFDM or DMT system has nodes which are allowed to dynamically change their receive and transmit symbol rates, and the number of carriers within their signals. Changing of the symbol rate is done by changing the clocking frequency of the nodes' iFFT and FFT processors, as well as their serializers and deserializers. The nodes have several ways of dynamically changing the number of earners used. The selection of symbol rate and number of earners can be optimized for a given channel based on explicit channel measurements, a priori knowledge of the channel, or past experience. Provision is made for accommodating legacy nodes that may have constraints in symbol rate or the number of carriers they can support. The receiver can determine the correct symbol rate and number of earners through a priori knowledge, a first exchange of packets in a base mode that all nodes can understand, or an indication in the header of the data packet which is transmitted in a base mode of operation that all nodes can understand.

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1. A method of communicating from a first transceiver in a wireless multicarrier system comprising the steps of: transmitting from the first transceiver a group of symbols using a first particular number of carriers and a first particular symbol rate during a first period of time; andtransmitting fr

1. A method of communicating from a first transceiver in a wireless multicarrier system comprising the steps of: transmitting from the first transceiver a group of symbols using a first particular number of carriers and a first particular symbol rate during a first period of time; andtransmitting from the first transceiver another group of symbols using a second particular number of carriers and a second particular symbol rate during a subsequent period of time,wherein at least one of the second particular number of carriers and the second particular symbol rate is different than the first particular number of carriers and the first particular symbol rate; wherein the second particular number of carriers and the second particular symbol rate are identified in a header portion of the group of symbols transmitted at the first particular number of carriers and the first particular symbol rate; and further including the step of configuring the first transceiver to transmit the another group of symbols using the second particular number of carriers and the second particular symbol rate identified in the header portion of the group of symbols transmitted at the first particular number of carriers and the first particular symbol rate. 2. The method according to claim 1 wherein both the second particular number of carriers and the second particular symbol rate are different than the first particular number of carriers and the first particular symbol rate. 3. The method according to claim 2 wherein the second particular number of carriers is greater than the first particular number of carriers and the second particular symbol rate is greater than the first particular symbol rate. 4. The method according to claim 1 wherein the step of transmitting the group during the first period of time and transmitting the second group during the subsequent period of time are repeated in a cyclic manner. 5. The method according to claim 1 wherein the step of transmitting the group of symbols from the first transceiver transmits the group of symbols as a plurality of packets and the step of transmitting the another group of symbols from the first transceiver transmits the another group of symbols as another plurality of packets. 6. An apparatus for communicating in a wireless multicarrier system comprising: a first transceiver; anda controller unit coupled to the first transceiver, wherein:the first transceiver is configured for transmitting a group of symbols using a first particular number of carriers and a first particular symbol rate during a first period of time; andthe first transceiver is further configured for transmitting another group of symbols using a second particular number of carriers and a second particular symbol rate during a subsequent period of time, wherein at least one of the second particular number of carriers and the second particular symbol rate is different than the first particular number of carriers and the first particular symbol rate; wherein the second particular number of carriers and the second particular symbol rate are identified in a header portion of the group of symbols transmitted at the first particular number of carriers and the first particular symbol rate; and the controller unit is further configured for configuring the first transceiver to transmit the another group of symbols using the second particular number of carriers and the second particular symbol rate identified in the header portion of the group of symbols transmitted at the first particular number of carriers and the first particular symbol rate. 7. The apparatus according to claim 6 wherein both the second particular number of carriers and the second particular symbol rate are different than the first particular number of carriers and the first particular symbol rate. 8. The apparatus according to claim 7 wherein the second particular number of carriers is greater than the first particular number of carriers and the second particular symbol rate is greater than the first particular symbol rate. 9. The apparatus according to claim 6 wherein the first transceiver is further configured for transmitting the group of symbols and the another group of symbols are repeated in a cyclic manner. 10. The apparatus according to claim 6 wherein the first transceiver is further configured for transmitting the group of symbols as a plurality of packets and transmitting the another group of symbols as another plurality of packets.