Signal processing method, transmitter, and compressive sampling receiving device

Patent metadata

Field	Value
Publication number	US-10044401-B2
Application number	US-201615394354-A
Country	US
Kind code	B2
Filing date	Dec 29, 2016
Priority date	Jul 2, 2014
Publication date	Aug 7, 2018
Grant date	Aug 7, 2018

Abstract

Embodiments provide a signal processing method, a transmitter, and a compressive sampling receiving device. The method includes: obtaining a periodic pseudo random sequence used when a compressive sampling receiving device performs frequency mixing. The method also includes selecting 2N information symbols from N radio signals; determining a precoding matrix D according to the periodic pseudo random sequence. The method also includes using the precoding matrix to perform precoding processing on the 2N information symbols to obtain 2N precoding results. The method also includes separately transmitting the 2N precoding results to the compressive sampling receiving device by using the 2N carriers.

First claim

What is claimed is:

1. A method, comprising:
obtaining a periodic pseudo random sequence used when a compressive sampling receiving device performs frequency mixing;
selecting 2N information symbols from N radio signals, wherein the N radio signals are separately located on N narrow bands, the 2N information symbols are separately located on 2N carriers on the N narrow bands, and spectrums of the 2N information symbols on the 2N carriers are shifted to a same frequency band after the frequency mixing is performed, and N is an integer greater than or equal to 1;
determining a precoding matrix D according to the periodic pseudo random sequence, wherein a conjugate transpose matrix D H of the precoding matrix D meets a singular value decomposition formula A s = SVD H , wherein matrix A s is a matrix comprising columns that correspond to the N narrow bands and that are in an equivalent channel matrix A, and the matrix A is generated based on the periodic pseudo random sequence, and wherein S is a conjugate transpose matrix of a received matrix S H , and V is a diagonal matrix; and
using the precoding matrix to perform precoding processing on the 2N information symbols to obtain 2N precoding results, and separately transmitting the 2N precoding results to the compressive sampling receiving device using the 2N carriers.

2. The method according to claim 1 , wherein using the precoding matrix to perform precoding processing on the 2N information symbols to obtain 2N precoding results comprises:
taking a conjugate of one half of the 2N information symbols, and keeping the other half unchanged, to obtain 2N to-be-precoded entries;
multiplying the precoding matrix by a column vector that comprises the 2N to-be-precoded entries, to obtain 2N intermediate entries; and
taking a conjugate of one half of the 2N intermediate entries, and keeping the other half unchanged, to obtain the 2N precoding results.

3. The method according to claim 2 , wherein taking a conjugate of one half of the 2N information symbols comprises:
determining N target carriers from the 2N carriers, wherein the N target carriers meet the following condition: after undergoing compressive sampling performed by the compressive sampling receiving device, information symbols located on the N target carriers are taken a conjugate of; and
taking a conjugate of the information symbols that are in the 2N information symbols and are located on the N target carriers.

4. The method according to claim 3 , wherein taking the conjugate of one half of the 2N intermediate entries comprises:
taking the conjugate of intermediate entries that are in the 2N intermediate entries and are converted from the information symbols on the N target carriers.

5. The method according to claim 4 , wherein separately transmitting the 2N precoding results to the compressive sampling receiving device using the 2N carriers comprises:
separately transmitting the 2N precoding results to the compressive sampling receiving device using the 2N carriers, wherein a precoding result transmitted by using each carrier is converted from an information symbol located on the carrier.

6. The method according to claim 1 , wherein obtaining the periodic pseudo random sequence used when the compressive sampling receiving device performs frequency mixing comprises:
receiving signaling sent by the compressive sampling receiving device, wherein the signaling indicates a serial number of the periodic pseudo random sequence; and
obtaining, from a prestored periodic pseudo random sequence set according to the signaling, the periodic pseudo random sequence corresponding to the serial number.

7. The method according to claim 1 , wherein selecting the 2N information symbols from N radio signals comprises:
selecting the 2N carriers from the N narrow bands according to a frequency f p of the periodic pseudo random sequence, wherein the 2N carriers meet the following condition: after the frequency mixing is performed, the spectrums on the 2N carriers are shifted to the same frequency band in a frequency mixing interval [−f p /2, +f p /2]; and
selecting the 2N information symbols on the 2N carriers as the 2N information symbols.

8. The method according to claim 1 , wherein the columns corresponding to the N narrow bands are columns that are in the matrix A and that have same numbers as nonzero rows in a matrix Z, the matrix Z meets: Y=AZ, and matrix Y is a received signal matrix corresponding to the N radio signals.

9. The method according to claim 1 , wherein each radio signal in the N radio signals is a signal that occupies a preset continuous frequency band.

10. The method according to a claim 1 , wherein the N radio signals are orthogonal frequency division multiplexing (OFDM) signals, the N narrow bands are subbands, the 2N information symbols are OFDM symbols, and the 2N carriers are subcarriers.

11. A method, comprising:
obtaining, by a compressive sampling receiving device, a received signal matrix Y;
determining a received matrix S H according to a periodic pseudo random sequence used by the compressive sampling receiving device, wherein a conjugate transpose matrix S of S H meets a singular value decomposition formula A s = SVD H , wherein matrix A s comprises columns that are in an equivalent channel matrix A and that have same numbers as nonzero rows in a matrix Z, the matrix Z meets: Y=AZ, and the matrix A is generated based on the periodic pseudo random sequence, and wherein D H is a conjugate transpose matrix of a precoding matrix D , and V is a diagonal matrix; and
multiplying the matrix S H by the matrix Y, so as to restore a signal based on a multiplication result.

12. The method according to claim 11 , wherein before obtaining the received signal matrix Y, the method further comprises:
sending signaling to a transmission device, wherein the signaling indicates a serial number of the periodic pseudo random sequence, the serial number is preset, and the serial number is used by the transmission device to obtain the periodic pseudo random sequence from a prestored periodic pseudo random sequence set according to the serial number.

13. A transmission device, comprising:
a processor; and
a computer-readable storage medium storing a program to be executed by the processor, the program including instructions for:
obtaining a periodic pseudo random sequence used when a compressive sampling receiving device performs frequency mixing;
selecting 2N information symbols from N radio signals, wherein the N radio signals are separately located on N narrow bands, the 2N information symbols are separately located on 2N carriers on the N narrow bands, spectrums of the 2N information symbols on the 2N carriers are shifted to a same frequency band after the frequency mixing is performed, and N is an integer greater than or equal to 1;
determining a precoding matrix D according to the periodic pseudo random sequence, wherein a conjugate transpose matrix D H of the precoding matrix D meets a singular value decomposition formula A s = SVD H , wherein matrix A s is a matrix comprising columns that correspond to the N narrow bands and that are in an equivalent channel matrix A, and the matrix A is generated based on the periodic pseudo random sequence, and wherein S is a conjugate transpose matrix of a received matrix S H , and V is a diagonal matrix; and
using the precoding matrix to perform precoding processing on the 2N information symbols, to obtain 2N precoding results; and

a transmitter, configured to separately transmit, using the 2N carriers, the 2N precoding results to the com

Assignees

• Huawei Tech Co Ltd

Inventors

• Zhu Hufei

Classifications

• H04L27/2602

  Signal structure · CPC title

• H04B7/0456

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

• H04B1/66 Primary

  for reducing bandwidth of signals; for improving efficiency of transmission (H04B1/68 takes precedence) · CPC title

• H04L2025/03414

  Multicarrier · CPC title

• H04L25/03343

  Arrangements at the transmitter end · CPC title