Method and apparatus for generating, transmitting and receiving signals based on filter bank in wireless communication system

Patent metadata

Field	Value
Publication number	US-10027520-B2
Application number	US-201615322099-A
Country	US
Kind code	B2
Filing date	Jan 22, 2016
Priority date	Jan 23, 2015
Publication date	Jul 17, 2018
Grant date	Jul 17, 2018

Abstract

The present disclosure relates to a communication method and system for converging a 5G communication system for supporting higher data rates beyond a 4G system with a technology for IoT. The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The present application discloses a method and device for transmitting and receiving signals based on a filter bank. The device comprises: a CS-DFT spreading unit for generating two data flows by applying a CS-DFT spreading operation to a first complex-value data flow input thereto; a sub-carrier mapping unit for mapping each of the two data flows to corresponding sub-carriers; and an OQAM modulator for generating OQAM signals by applying an OQAM operation to the data flows mapped on sub-carriers.

First claim

The invention claimed is:

1. A transmission device in a wireless communication system, comprising:
a spreading unit configured to generate two data flows by applying a conjugate symmetric discrete fourier transform (CS-DFT) spreading operation to a first complex-value data flow input thereto, the CS-DFT spreading operation comprising a conjugate symmetric operation and a subsequent discrete fourier transform (DFT) spreading operation;
a sub-carrier mapping unit configured to map each of the two data flows to sub-carriers; and
a modulator configured to generate offset quadrature amplitude modulation (OQAM) signals by applying a quadrature amplitude modulation operation to the data flows mapped on sub-carriers.

2. The transmission device of claim 1 , wherein the spreading unit comprises:
a conjugate symmetric operation unit configured to generate two conjugate symmetric complex-value data flows by applying the conjugate symmetric operation to the first complex-value data flow input thereto; and
a discrete fourier transform (DFT) spreading unit configured to generate two pure real-valued data flows by applying the DFT spreading operation to each of the two generated conjugate symmetric complex-value data flows.

3. The transmission device of claim 2 , wherein the modulator is alternately configured to modulate the two pure real-valued data flows onto real parts and imaginary parts of the mapped sub-carriers.

4. The transmission device of claim 1 , wherein the spreading unit comprises:
a conjugate symmetric operation unit configured to generate two conjugate symmetric complex-value data flows by applying the conjugate symmetric operation to the first complex-value data flow input thereto;
a phase rotation unit configured to rotate the phase of one of the two conjugate symmetric complex-value data flows; and
a DFT spreading unit configured to generate a pure imaginary-valued data flow by applying the DFT spreading operation to the complex-value data flow of which the phase is rotated, and to generate a pure real-valued data flow by applying the DFT spreading operation to the other one of the generated complex-value data flows, of which the phase is not rotated.

5. The transmission device of claim 4 , wherein the phase rotation unit is used for multiplying each symbol element in the first complex-value data flow with an imaginary unit j.

6. The transmission device of claim 1 , further comprising a sub-carrier allocation unit configured to respectively generate a real-imaginary-alternate complex-value data flow and an imaginary-real-alternate complex-value data flow by permuting and to combine a pure imaginary-valued data flow and a pure real-valued data flow output from the DFT spreading unit, wherein the sub-carrier allocation unit is used for generating a real-imaginary-alternate complex-value data flow and an imaginary-real-alternate complex-value data flow by exchanging data symbols at even positions or odd positions in the pure imaginary-valued data flow and the pure real-valued data flow, respectively.

7. The transmission device of claim 4 , wherein the modulator directly is configured to modulate a real-imaginary-alternate complex-value data flow and an imaginary-real-alternate complex-value data flow onto the mapped sub-carriers.

8. The transmission device of claim 1 , wherein the spreading unit comprises:
a conjugate symmetric operation unit configured to generate two conjugate symmetric complex-value data flows by applying the conjugate symmetric operation to the first complex-value data flow input thereto;
a pre-coding unit configured to pre-code each of the two conjugate symmetric complex-value data flows; and
a DFT spreading unit configured to generate a real-imaginary-alternate complex-value data flow and an imaginary-real-alternate complex-value data flow by applying the DFT spreading operation to the two pre-coded complex-value data flows.

9. The transmission device of claim 8 , wherein the modulator is configured to directly modulate the real-imaginary-alternate complex-value data flow and the imaginary-real-alternate complex-value data flow to the mapped sub-carriers.

10. The transmission device of claim 1 , wherein the spreading unit comprises:
a conjugate symmetric operation unit configured to generating a conjugate symmetric complex-value data flow by applying the conjugate symmetric operation to the first complex-value data flow input thereto;
a DFT spreading unit configured to generate a pure real-valued data flow by applying the DFT spreading operation to the conjugate symmetric complex-value data flow; and
a sub-carrier permutation unit configured to adjust and exchange positions of each data symbol in the pure real-valued data flow in a predetermined manner and dividing the position adjusted data symbols into two pure real-valued data flows with equal length.

11. The transmission device of claim 10 , wherein the modulator is configured to alternately modulate the two pure real-valued data flows with equal length onto real parts and imaginary parts of the mapped sub-carriers.

12. A reception device in a wireless communication system, comprising:
a demodulator configured to generate two complex-value data flows by demodulating offset quadrature amplitude modulation (OQAM) signals;
a sub-carrier selection unit configured to select two first complex-value data flows which are from the two complex-value data flows on mapped sub-carriers; and
an inverse spreading unit configured to generate a complex-value data flow by applying a conjugate symmetric inverse discrete fourier transform (CS-IDFT) operation to the two first complex-value data flows, the CS-IDFT operation comprising an inverse discrete fourier transform (IDFT) spreading operation and a subsequent inverse conjugate symmetric operation.

13. The reception device of claim 12 , wherein the inverse spreading unit comprises:
a phase rotation unit configured to rotate a phase of each of the two first complex-value data flows to generate two second complex-value data flows;
a real/imaginary part extraction unit configured to extract a real part of each data symbol in the two second complex-value data flows;
an inverse discrete fourier transform (IDFT) spreading unit configured to generate two third complex-value data flows by applying the IDFT spreading operation to each of the real parts of the two second complex-value data flows; and
an inverse conjugate symmetric operation unit configured to generate a complex-value data flow by applying the inverse conjugate symmetric operation to the two third complex-value data flows.

14. The reception device of claim 13 , wherein the phase rotation unit is configured to alternately multiply data symbols in one of the two first complex-value data flows with 1 and −j and to alternately multiply data symbols in the other one of the two first complex-value data flows with −j and 1.

15. The reception device of claim 12 , wherein the inverse spreading unit comprises:
a sub-carrier inverse allocation unit configured to permute and combine the two first complex-value data flows to generate two fourth complex-value data flows;
a real/imaginary part extraction unit configured to extract real parts of one of the two fourth complex-value data flows and extracting imaginary parts of the other one of the two fourth complex-value data flows;
an IDFT spreading unit configured to generate two fifth complex-value data flows by applying the IDFT spreading operation to the real parts and imaginary parts extracted from the two fourth complex-value data flows, respectively;
a phase rotation unit configured t

Assignees

• Samsung Electronics Co Ltd
• Samsung Electronics Co Ltd

Inventors

• Zhu Dalin
• Yu Bin
• Sun Pengfei

Classifications

• H04L27/34

  Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems · CPC title

• H04L27/2698

  double density OFDM/OQAM system, e.g. OFDM/OQAM-IOTA system · CPC title

• H04L27/362

  Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated (H04L27/366 takes precedence) · CPC title

• H04B7/0456

  Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting · CPC title

• H04L27/263

  modification of IFFT/IDFT modulator for performance improvement · CPC title