Low PAPR DMRS and low inter-cell interference for DFT-spread OFDM
A WTRU may comprise circuitry configured to determine DMRS sequences of length 12, 18 and 24 for PI/2 BPSK DFT-s-OFDM modulation. The sequences are optimized for PAPR, CM, frequency flatness, cross-correlation and for channel estimation (cyclic correlation).
1. A wireless transmit/receive unit (WTRU) comprising:
a processor configured to determine a sequence, from a set of sequences comprising 0 0 0 0 0 0 1 1 0 1 1 0, 0 0 0 0 0 1 0 0 0 1 1 1 and 0 0 0 0 0 1 1 1 0 1 1 1; and
a transmitter configured to transmit a demodulation reference signal (DMRS) derived from the determined sequence.
2. The WTRU of claim 1 , wherein the determined sequence is 0 0 0 0 0 0 1 1 0 1 1 0.
3. The WTRU of claim 1 , wherein the determined sequence is 0 0 0 0 0 1 0 0 0 1 1 1.
4. The WTRU of claim 1 , wherein the determined sequence is 0 0 0 0 0 1 1 1 0 1 1 1.
5. The WTRU of claim 1 , wherein the DMRS is a reference signal corresponding to an uplink shared channel.
6. A wireless transmit/receive unit (WTRU) comprising:
a processor configured to determine a sequence, from a set of sequences comprising: 0 0 0 0 0 0 0 1 1 1 1 1 0 0 1 0 0 1, 0 0 0 0 0 1 0 0 0 1 1 1 1 1 0 0 0 1 and 0 0 0 0 0 1 1 1 1 0 1 1 1 0 1 1 1 1; and
a transmitter configured to transmit a demodulation reference signal (DMRS) derived from the determined sequence.
7. The WTRU of claim 6 , wherein the determined sequence is 0 0 0 0 0 0 0 1 1 1 1 1 0 0 1 0 0 1.
8. The WTRU of claim 6 , wherein the determined sequence is 0 0 0 0 0 1 0 0 0 1 1 1 1 1 0 0 0 1.
9. The WTRU of claim 6 , wherein the determined sequence is 0 0 0 0 0 1 1 1 1 0 1 1 1 0 1 1 1 1.
10. The WTRU of claim 6 , wherein the DMRS is a reference signal corresponding to an uplink shared channel.
11. A wireless transmit/receive unit (WTRU) comprising:
a processor configured to determine a sequence, from a set of sequences comprising: 0 0 0 0 0 0 0 1 0 0 1 1 1 1 1 0 0 1 0 0 1 0 0 1, 0 0 0 0 0 0 0 0 1 1 0 1 1 0 0 1 0 1 0 1 1 0 1 1, 0 0 0 0 0 0 0 0 1 0 0 1 0 0 1 0 0 1 1 1 1 0 1 1 and 0 0 0 0 0 0 0 1 0 0 1 0 1 1 0 1 1 1 0 0 0 1 1 0; and
a transmitter configured to transmit a demodulation reference signal (DMRS); derived from the determined sequence.
12. The WTRU of claim 11 , wherein the determined sequence is 0 0 0 0 0 0 0 1 0 0 1 1 1 1 1 0 0 1 0 0 1 0 0 1.
13. The WTRU of claim 11 , wherein the determined sequence is 0 0 0 0 0 0 0 0 1 1 0 1 1 0 0 1 0 1 0 1 1 0 1 1.
14. The WTRU of claim 11 , wherein the determined sequence is 0 0 0 0 0 0 0 0 1 0 0 1 0 0 1 0 0 1 1 1 1 0 1 1.
15. The WTRU of claim 11 , wherein the determined sequence is 0 0 0 0 0 0 0 0 1 0 0 1 0 0 1 0 0 1 1 1 1 0 1 1 0 0 0 0 0 0 0 1 0 0 1 0 1 1 0 1 1 1 0 0 0 1 1 0.
16. The WTRU of claim 11 , wherein the DMRS is a reference signal corresponding to an uplink shared channel.