TRANSMIT PSD CEILING IN PACKET-BASED OFDM SYSTEMS
Adjusted maximum transmit PSD levels have an effect on the SNR. If the ADC noise is assumed to be the limiting factor, then there can be a benefit for reducing the maximum transmit PSD level. For example, by lowering the maximum transmit PSD level from −50 dBm/Hz to −70 dBm/Hz results in an increase in SNR for subcarriers above 30 M Hz. The SNR for subcarriers above 30 MHz can increase from 30 db (−80-(−110)) to 50 db (−80-(−130)). Therefore, by changing the maximum transmit PSD level, applying a ceiling on PSD mask, the aggregate sum of the available SNR's over the available subcarriers is therefore increasing the obtainable OFDM data rate. In other words, a maximum transmit PSD mask can be used to lower the transmit PSD value of at least one subcarrier which results in an increase in SNR for at least one subcarrier.
1 . In an OFDM packet-based transceiver, a method comprising:
generating a packet comprising a header;
encoding a transmit PSD ceiling value into a bit field contained in the header of a packet; and
transmitting the packet using a plurality of subcarriers.
2 . In an OFDM packet-based transceiver, a method comprising:
receiving a packet using a plurality of subcarriers;
processing a header of the packet;
decoding a bit field in the header that contains the transmit PSD ceiling value.
3 . (canceled)
4 . The method of claim 1 , wherein the transmit PSD value of at least one subcarrier is limited by the transmit PSD ceiling value.
5 . The method of claim 1 , wherein the PSD ceiling value is used to determine the PSD or limit the PSD of at least one subcarrier.
6 .- 44 . (canceled)
45 . In an OFDM packet-based system, a method comprising:
generating, in a first transceiver, a packet comprising a header;
encoding, in the first transceiver, a transmit PSD ceiling value into a bit field contained in the header of a packet;
transmitting, from the first transceiver, the packet using a plurality of subcarriers;
receiving, in a second transceiver, a packet using the plurality of subcarriers;
processing, in the second transceiver, the header of the packet; and
decoding, in the second transceiver, the bit field in the header that contains the transmit PSD ceiling value.
46 .- 347 . (canceled)
348 . The method of claim 2 , wherein the transmit PSD value of at least one subcarrier is limited by the transmit PSD ceiling value.
349 . The method of claim 2 , wherein PSD ceiling value is used to determine the PSD or limit the PSD of at least one subcarrier.
350 . The method of claim 45 , wherein the transmit PSD value of at least one subcarrier is limited by the transmit PSD ceiling value.
351 . The method of claim 45 , wherein PSD ceiling value is used to determine the PSD or limit the PSD of at least one subcarrier.
352 . An OFDM packet-based transceiver capable of generating a packet comprising a header, encoding a transmit PSD ceiling value into a bit field contained in the header of a packet, and transmitting the packet using a plurality of subcarriers.
353 . The transceiver of claim 352 , wherein the transmit PSD value of at least one subcarrier is limited by the transmit PSD ceiling value.
354 . The transceiver of claim 352 , wherein PSD ceiling value is used to determine the PSD or limit the PSD of at least one subcarrier.
355 . An OFDM packet-based transceiver capable of receiving a packet using a plurality of subcarriers, processing a header of the packet, and decoding a bit field in the header that contains the transmit PSD ceiling value.
356 . The transceiver of claim 355 , wherein the transmit PSD value of at least one subcarrier is limited by the transmit PSD ceiling value.
357 . The transceiver of claim 355 , wherein PSD ceiling value is used to determine the PSD or limit the PSD of at least one subcarrier.
358 . An OFDM packet-based system comprising:
a first transceiver capable of generating a packet comprising a header, encoding a transmit PSD ceiling value into a bit field contained in the header of a packet and transmitting, from the first transceiver, the packet using a plurality of subcarriers;
a second transceiver capable of receiving a packet using the plurality of subcarriers, processing the header of the packet, and decoding the bit field in the header that contains the transmit PSD ceiling value.
359 . The system of claim 358 , wherein the transmit PSD value of at least one subcarrier is limited by the transmit PSD ceiling value.
360 . The system of claim 358 , wherein PSD ceiling value is used to determine the PSD or limit the PSD of at least one subcarrier.
361 . A non-transitory computer-readable information storage media having stored thereon instructions, that if executed by a processor, cause to be performed in an OFDM packet-based transceiver a method comprising:
generating a packet comprising a header;
encoding a transmit PSD ceiling value into a bit field contained in the header of a packet; and
transmitting the packet using a plurality of subcarriers.
362 . The media of claim 361 , wherein the transmit PSD value of at least one subcarrier is limited by the transmit PSD ceiling value.
363 . The media of claim 361 , wherein PSD ceiling value is used to determine the PSD or limit the PSD of at least one subcarrier.
364 . A non-transitory computer-readable information storage media having stored thereon instructions, that if executed by a processor, cause to be performed in an OFDM packet-based transceiver a method comprising:
receiving a packet using a plurality of subcarriers;
processing a header of the packet;
decoding a bit field in the header that contains the transmit PSD ceiling value.
365 . The media of claim 364 , wherein the transmit PSD value of at least one subcarrier is limited by the transmit PSD ceiling value.
366 . The media of claim 364 , wherein PSD ceiling value is used to determine the PSD or limit the PSD of at least one subcarrier.
367 . A non-transitory computer-readable information storage media having stored thereon instructions, that if executed by a processor, cause to be performed in an OFDM packet-based system a method comprising:
generating, in a first transceiver, a packet comprising a header;
encoding, in the first transceiver, a transmit PSD ceiling value into a bit field contained in the header of a packet;
transmitting, from the first transceiver, the packet using a plurality of subcarriers;
receiving, in a second transceiver, a packet using the plurality of subcarriers;
processing, in the second transceiver, the header of the packet; and
decoding, in the second transceiver, the bit field in the header that contains the transmit PSD ceiling value.
368 . The media of claim 367 , wherein the transmit PSD value of at least one subcarrier is limited by the transmit PSD ceiling value.
369 . The media of claim 367 , wherein PSD ceiling value is used to determine the PSD or limit the PSD of at least one subcarrier.