Hybrid orthogonal frequency division multiple access WTRU and method
View Patent ↗A hybrid orthogonal frequency division multiple access (OFDMA) wireless transmit/receive unit (WTRU) and method are disclosed. A WTRU includes a transmitter and a receiver. The receiver processes received data to recover data mapped to the subcarriers using OFDMA. The receiver recovers first input data by separating user data from multi-user spread data and recovers second input data from non-spread data.
1. A wireless transmit/receive unit (WTRU) comprising:
a receiver configured to receive in a first single symbol time interval a plurality of subcarriers; wherein a first group of subcarriers from the plurality of subcarriers includes information for the WTRU combined with an orthogonal sequence; wherein the first group of subcarriers includes information for a plurality of WTRUs; wherein the information for each of the plurality of WTRUs is combined with an orthogonal sequence and the orthogonal sequence for each of the plurality of WTRUs is different; wherein a second group of subcarriers from the plurality of subcarriers includes information for the WTRU not combined with an orthogonal sequence;
wherein the receiver is further configured to recover the information for the WTRU from the first group of subcarriers and the receiver is further configured to recover the information for the WTRU from the second group of subcarriers; and
wherein a third group of subcarriers from the plurality of subcarriers in the first single symbol time interval includes information for another WTRU that is not combined with an orthogonal sequence.
2. The WTRU of claim 1 wherein the first group of subcarriers are not contiguous subcarriers.
3. The WTRU of claim 1 wherein the receiver is configured to recover the information from the first group of subcarriers using despreading.
4. The WTRU of claim 1 wherein the information in the first group of subcarriers is time repeated in a second single symbol time interval and the orthogonal sequence in the first single symbol time interval and the second single symbol time interval frequency spreads the information; wherein the receiver is further configured to recover the information using the time repeated information.
5. The WTRU of claim 1 wherein the first single symbol time interval includes pilot signals.
6. The WTRU of claim 5 wherein the WTRU uses the pilot signals to aid in recovering the information from the first and second groups of subcarriers.
7. A method comprising:
receiving by a wireless transmit/receive unit (WTRU) in a first single symbol time interval a plurality of subcarriers; wherein a first group of subcarriers from the plurality of subcarriers includes information for the WTRU combined with an orthogonal sequence; wherein the first group of subcarriers includes information for a plurality of WTRUs; wherein the information for each of the plurality of WTRUs is combined with an orthogonal sequence and the orthogonal sequence for each of the plurality of WTRUs is different; wherein a second group of subcarriers from the plurality of subcarriers includes information for the WTRU not combined with an orthogonal sequence;
recovering by the WTRU the information for the WTRU from the first group of subcarriers;
recovering by the WTRU the information for the WTRU from the second group of subcarriers; and
wherein a third group of subcarriers from the plurality of subcarriers in the first single symbol time interval includes information for another WTRU that is not combined with an orthogonal sequence.
8. The method of claim 7 wherein the first group of subcarriers are not contiguous subcarriers.
9. The method of claim 7 wherein the information recovered from the first group of subcarriers is performed using despreading.
10. The method of claim 7 wherein the information in the first group of subcarriers is time repeated in a second single symbol time interval and the orthogonal sequence in the first single symbol time interval and the second single symbol time interval frequency spreads the information; wherein the recovering the information includes using the time repeated information.
11. The method of claim 7 wherein the first single symbol time interval includes pilot signals.
12. The method of claim 11 wherein the WTRU uses the pilot signals to aid in recovering the information from the first and second groups of subcarriers.
13. A wireless network device comprising:
a transmitter configured to transmit in a first single symbol time interval a plurality of subcarriers; wherein a first group of subcarriers from the plurality of subcarriers includes information for a first wireless transmit/receive unit (WTRU) combined with an orthogonal sequence; wherein the first group of subcarriers includes information for a plurality of WTRUs; wherein the information for each of the plurality of WTRUs is combined with an orthogonal sequence and the orthogonal sequence for each of the plurality of WTRUs is different; wherein a second group of subcarriers from the plurality of subcarriers includes information for the first WTRU not combined with an orthogonal sequence; wherein a third group of subcarriers from the plurality of subcarriers in the first single symbol time interval includes information for a second WTRU that is not combined with an orthogonal sequence; wherein the first WTRU and the second WTRU are different.
14. The wireless network device of claim 13 wherein the first group of subcarriers are not contiguous subcarriers.
15. The wireless network device of claim 13 wherein the information in the first group of subcarriers is time repeated in a second single symbol time interval and the orthogonal sequence in the first single symbol time interval and the second single symbol time interval frequency spreads the information.
16. The wireless network device of claim 13 further comprising transmitting pilot signals in the first single symbol time interval.