System, method, and apparatus for low power cyclic prefix (cp) based hybrid spread waveforms

Patent metadata

Field	Value
Publication number	US-2018367355-A1
Application number	US-201615780326-A
Country	US
Kind code	A1
Filing date	Dec 2, 2016
Priority date	Dec 3, 2015
Publication date	Dec 20, 2018
Grant date	—

Abstract

Systems, methods, and instrumentalities are disclosed for generating, transmitting, and/or receiving a hybrid spread waveform. The hybrid spread waveform may include a data portion and a hybrid guard interval (HGI) portion. The HGI portion may include a fixed prefix portion or a fixed suffix portion, and an adaptive low power tail (LPT) portion. The fixed prefix portion or the fixed suffix portion is a low power cyclic prefix (LPCP). The LPCP may be generated at least based on at least the channel delay spread and a power regrowth length. The adaptive LPT portion may be generated using a zero tail (ZT). The LPT is generated by inserting zeros at IFFT or DFT processing stage. A part of the adaptive LPT portion is used to carry data or control information. A waveform may be switched between a hybrid spread waveform and a fixed-CP waveform, e.g., via control signaling.

First claim

1 - 22 . (canceled)

23 . A method for generating a hybrid spread waveform, the method comprising:
generating the hybrid spread waveform comprising a data portion and a hybrid guard interval (HGI) portion, wherein the HGI portion comprises a fixed prefix portion or a fixed suffix portion, and an adaptive low power tail (LPT) portion, wherein the adaptive LPT portion is dynamically adapted based on channel delay spread; and transmitting the generated hybrid spread waveform.

24 . The method of claim 23 , wherein the fixed prefix portion or the fixed suffix portion is a low power cyclic prefix (LPCP), wherein the LPCP is generated based on at least the channel delay spread and a power regrowth length.

25 . The method of claim 23 , wherein the adaptive LPT portion is generated using a zero tail (ZT), wherein the LPT is generated by inserting zeros at IFFT or DFT processing stage.

26 . The method of claim 23 , further comprising receiving one or more of a hybrid guard interval (HGI) length, an adaptive low power tail (LPT) length, or an indication of a number of zeros inserted before FFT or DFT, wherein one or more of the hybrid guard interval (HGI) length, the adaptive low power tail (LPT) length, or the indication of the number of zeros is received via a physical control channel, a MAC IE or RRC signaling.

27 . The method of claim 23 , wherein a part of the adaptive LPT portion is used to carry data or control information.

28 . The method of claim 23 , wherein the fixed prefix portion is a zero power prefix, and wherein the zero power prefix is generated based on zero padding (ZP).

29 . The method of claim 23 , further comprising receiving a control signaling indicating switching waveform type between a fixed-CP waveform and the hybrid spread waveform.

30 . A wireless transmit/receive unit (WTRU) comprising:
a processor configured to at least:
generate a hybrid spread waveform comprising a data portion and a hybrid guard interval (HGI) portion, wherein the HGI portion comprises a fixed prefix portion or a fixed suffix portion, and an adaptive low power tail (LPT) portion, wherein the adaptive LPT portion is dynamically adapted based on channel delay spread; and
a transmitter configured to at least transmit the generated hybrid spread waveform.

31 . The WTRU of claim 30 , wherein the fixed prefix portion or the fixed suffix portion is a low power cyclic prefix (LPCP), wherein the LPCP is generated based on at least the channel delay spread and a power regrowth length.

32 . The WTRU of claim 30 , wherein the adaptive LPT portion is generated using a zero tail (ZT), wherein the LPT is generated by inserting zeros at IFFT or DFT processing stage.

33 . The WTRU of claim 30 comprising a receiver configured to at least receive one or more of a hybrid guard interval (HGI) length, an adaptive low power tail (LPT) length, or an indication of a number of zeros inserted before FFT or DFT,

34 . The WTRU of claim 30 , wherein one or more of the hybrid guard interval (HGI) length, the adaptive low power tail (LPT) length, or the indication of the number of zeros is received via a physical control channel, a MAC IE or RRC signaling.

35 . The WTRU of claim 30 , wherein a part of the adaptive LPT portion is used to carry data or control information.

36 . The WTRU of claim 30 , wherein the fixed prefix portion is a zero power prefix, and wherein the zero power prefix is generated based on zero padding (ZP).

37 . The WTRU of claim 30 comprising a receiver configured to at least receive a control signaling indicating switching waveform type between a fixed-CP waveform and the hybrid spread waveform.

Assignees

• Idac Holdings Inc

Inventors

• Pan Kyle Jung-Lin
• Beluri Mihaela C
• Pragada Ravikumar V
• Bala Erdem
• Deenoo Yugeswar
• Ma Liangping
• Deng Tao
• Roy Vincent

Classifications

• H04L5/0051

  of dedicated pilots, i.e. pilots destined for a single user or terminal · CPC title

• H04L27/2646

  using feedback from receiver for adjusting OFDM transmission parameters, e.g. transmission timing or guard interval length · CPC title

• H04L27/2615

  Reduction thereof using coding · CPC title

• H04W52/0212

  managed by the network, e.g. network or access point is leader and terminal is follower · CPC title

• H04L27/2636 Primary

  with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM] · CPC title