Method, apparatus and system for sending physical layer signal

• US 9,461,866 B2
• Filed: 12/08/2014
• Issued: 10/04/2016
• Est. Priority Date: 06/07/2012
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.), Tsinghua University
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.), Tsinghua University
• Inventors: Xiao, Zhenyu, Zhang, Changming, Liu, Pei
• Primary Examiner(s): CATTUNGAL, AJAY P
• Application Number:
  US14/563,799
• Publication Number:
  US 20150092724A1
• Time in Patent Office: 666 Days
• US Class Current: 1/1
• CPC Class Codes: H04L 1/0086 Unequal error protection H04L27/00 and H04L1/004 take precedence for layer 1/2 aspects, e.g. bit loading
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 27/3863 Compensation for quadrature error in the received signal
• CPC Class Codes: H04L 43/04 Processing captured monitoring data, e.g. for logfile generation
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA

Abstract

Embodiments of the present invention disclose a method, an apparatus and a system for sending a physical layer signal, where the method for sending a physical layer signal includes: constructing a signal frame of a physical layer signal, where the signal frame includes one single-frequency sequence, the single-frequency sequence is used to enable a receiving apparatus to capture the signal frame in a frequency domain according to the single-frequency sequence, and the single-frequency sequence includes a plurality of single-frequency preset symbols; and sending the physical layer signal based on the signal frame. Applying the present invention can facilitate capturing the signal frame in a frequency domain by a receive end, and therefore, not only impact caused by frequency offset is overcome, but also multipath energy may be used effectively to improve performance of capturing.

Claims

1. A method for a sending apparatus to send a physical layer signal, the method comprising:

constructing, by the sending apparatus, a signal frame of the physical layer signal, wherein the signal frame comprises a single-frequency sequence, which enables a receiving apparatus to capture the signal frame in a frequency domain according to the single-frequency sequence, and the single-frequency sequence comprises a plurality of preset symbols; and

wherein the signal frame comprises a preset training data block, which enables the receiving apparatus to suppress, according to the preset training data block, nonlinear impact generated in a power amplification process; and

sending to the receiving apparatus, by the sending apparatus, the signal frame at a physical layer.

2. The method according to claim 1, wherein the single-frequency sequence is contained in a short training sequence part in the signal frame, which enables the receiving apparatus to perform estimation and compensation for the signal frame in a time domain and the frequency domain according to the short training sequence part.

3. The method according to claim 1, wherein before the sending the signal frame at the physical layer, the method further comprises:

modulating the signal frame to a radio frequency, and all constellation points obtained through the modulation of the training data block are distributed with equal probability.

4. The method according to claim 1, wherein the training data block is located before the data block in the signal frame.

5. The method according to claim 1, wherein the single-frequency sequence is located before the training data block.

14. The apparatus according to claim 1, wherein the single-frequency sequence is located before the training data block.

6. A method for a receiving apparatus to receive a physical layer signal, comprising:

receiving, by the receiving apparatus, a signal frame of the physical layer signal;

capturing, by the receiving apparatus, if the received signal frame of the physical layer signal comprises a single-frequency sequence, the signal frame in a frequency domain according to the single-frequency sequence, wherein the single-frequency sequence comprises a plurality of preset symbols;

wherein the signal frame comprises a preset training data block, and, after the capturing the signal frame in the frequency domain according to the single-frequency sequence, the method further comprises;

suppressing, by the receiving apparatus, according to the training data block, nonlinear impact generated in a power amplification process.

7. The method according to claim 6, wherein the single-frequency sequence is contained in a short training sequence part in the signal frame, and the short training sequence part enables the receiving apparatus to perform estimation and compensation for the signal frame in a time domain and the frequency domain.

8. The method according to claim 6, wherein phases of the preset symbols in the single-frequency sequence are increased sequentially by π

/2, and, after the capturing the signal frame in the frequency domain according to the single-frequency sequence, the method further comprises;

performing Inphase and Quadrature (IQ) imbalance estimation according to the single-frequency sequence.

9. The method according to claim 6, wherein suppressing, according to the training data block, the nonlinear impact generated in the power amplification process comprises:

estimating a distortion constellation diagram according to the training data block; and

determining and demodulating the physical layer signal based on the distortion constellation diagram.

10. A sending apparatus for sending a physical layer signal, comprising:

a signal frame constructing module, configured to construct a signal frame of the physical layer signal, wherein the signal frame comprises a single-frequency sequence, which enables a receiving apparatus to capture the signal frame in a frequency domain according to the single-frequency sequence, and the single-frequency sequence comprises a plurality of preset symbols; and

a transmitter, configured to send the signal frame at a physical layer to the receiving apparatus;

wherein the signal frame comprises a preset training data block, which enables the receiving apparatus to suppress, according to the preset training data block, nonlinear impact generated in a power amplification process.

11. The apparatus according to claim 10, wherein the single-frequency sequence is contained in a short training sequence part in the received signal frame, and the short training sequence part enables the receiving apparatus to perform estimation and compensation for the signal frame in a time domain and the frequency domain according to the short training sequence part.

12. The apparatus according to claim 10, wherein, before sending the signal frame at the physical layer, the transmitter modulates the signal frame to a radio frequency, and all constellation points obtained through the modulation of the training data block are distributed with equal probability.

13. The apparatus according to claim 10, wherein the training data block is located before the data block in the signal frame.

15. A receiving apparatus for receiving a physical layer signal, comprising:

a receiver, configured to receive a signal frame of the physical layer signal; and

a frequency domain frame capturing module, configured to capture, if the signal frame of the physical layer signal that is received by the receiver comprises a single-frequency sequence, the signal frame in a frequency domain according to the single-frequency sequence, wherein the single-frequency sequence comprises a plurality of preset symbols;

wherein the signal frame further comprises a preset training data block, and the apparatus further comprises;

a nonlinear suppressing module, configured to suppress, according to the training data block, nonlinear impact generated in a power amplification process.

16. The apparatus according to claim 15, wherein the single-frequency sequence is contained in a short training sequence part in the signal frame, and the short training sequence part enables the receiving apparatus to perform estimation and compensation for the signal frame in a time domain and the frequency domain.

17. The apparatus according to claim 15, wherein phases of the symbols in the single-frequency sequence are increased sequentially by π

/2, and the apparatus further comprises;

an Inphase and Quadrature (IQ) imbalance estimating module, configured to perform IQ imbalance estimation according to the single-frequency sequence.

18. The apparatus according to claim 15, wherein the nonlinear suppressing module comprises:

a distortion constellation diagram estimating unit, configured to estimate a distortion constellation diagram according to the training data block; and

a determining and demodulating unit, configured to determine and demodulate the physical layer signal based on the distortion constellation diagram.

19. The apparatus according to claim 15, wherein the training data block is located before the data block in the signal frame.

20. The apparatus according to claim 15, wherein the single-frequency sequence is located before the training data block.