Cascaded waveform modulation with an embedded control signal for high-performance mobile fronthaul

• US 10,205,522 B2
• Filed: 07/09/2018
• Issued: 02/12/2019
• Est. Priority Date: 06/18/2015
• Status: Active Grant

• Current Assignee: Futurewei Technologies Incorporated (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Futurewei Technologies Incorporated (Huawei Investment & Holding Co., Ltd.)
• Inventors: Liu, Xiang, Zeng, Huaiyu
• Primary Examiner(s): Tse, Young T
• Application Number:
  US16/030,568
• Publication Number:
  US 20180316431A1
• Time in Patent Office: 218 Days
• Field of Search: 375259-261, 375265, 375267, 375279, 375281, 375284, 375295-299, 375308, 332103, 332144, 332145, 370208, 370210, 370335, 370337, 370342, 370344, 370347
• CPC Class Codes: H04B 1/40 Circuits
• CPC Class Codes: H04B 10/25 Arrangements specific to fibre transmission
• CPC Class Codes: H04B 10/541 Digital intensity or amplitude modulation
• CPC Class Codes: H04B 10/5561 Digital phase modulation
• CPC Class Codes: H04B 10/60 Receivers
• CPC Class Codes: H04W 88/085 Access point devices with remote components

Abstract

A method including receiving, via a frontend of a communication device from a communication link, a cascaded waveform modulation with embedded control signal (CWM-CS); performing time-domain demultiplexing on the CWM-CS to obtain a first waveform modulation signal (W1), a second waveform modulation signal (W2), and a control signal (CS); training a channel equalizer based on the control signal; performing channel equalization on the first waveform modulation signal, the second waveform modulation signal, and the control signal CS; performing time-domain de-multiplexing on the first waveform modulation signal W1, the second waveform modulation signal W2, and the control signal CS; applying a rounding function to the first waveform modulation signal W1; generating a recovered signal (S), by summing the first waveform modulation signal W1 and the second waveform modulation signal W2; recovering data from the recovered signal S; and recovering control information by demodulating the control signal CS.

Claims

1. A method implemented in a communication device, comprising:

receiving, via a frontend of the communication device, a cascaded waveform modulation with embedded control signal (CWM-CS) from a communication link;

performing, via a processor of the communication device, time-domain de-multiplexing on the CWM-CS to obtain a first waveform modulation signal, denoted as W₁, a second waveform modulation signal, denoted as W₂, and a control signal, denoted as CS;

training, via the processor, a channel equalizer based on the control signal CS;

performing, via the processor, channel equalization on the first waveform modulation signal W₁, the second waveform modulation signal W₂, and the control signal CS;

performing, via the processor, time-domain de-multiplexing on the first waveform modulation signal W₁, the second waveform modulation signal W₂, and the control signal CS;

applying, via the processor, a rounding function to the first waveform modulation signal W₁;

generating, via the processor, a recovered signal, denoted as S, by summing the first waveform modulation signal W₁ and the second waveform modulation signal W₂;

recovering, via the processor, data from the recovered signal S; and

recovering, via the processor, control information by demodulating the control signal CS.

2. The method of claim 1, further comprising:

dividing, via the processor, the first waveform modulation signal W₁ by a first factor, denoted as c₁, prior to generating the recovered signal S;

dividing, via the processor, the second waveform modulation signal W₂ by a second factor, denoted as c₂, prior to generating the recovered signal S; and

dividing, via the processor, the control signal CS by a third factor, denoted as c₃, prior to recovering the control information.

3. The method of claim 1, further comprising performing frequency down-conversion on the CWM-CS received from the communication link.

4. The method of claim 1, further comprising performing pulse shaping on the CWM-CS received from the communication link.

5. The method of claim 1, further comprising performing down-sampling on the CWM-CS received from the communication link.

6. A communication device, comprising:

a frontend configured to receive a cascaded waveform modulation with embedded control signal (CWM-CS) from a communication link; and

a processor coupled to the frontend, the processor configured to;

perform time-domain de-multiplexing on the CWM-CS to obtain a first waveform modulation signal, denoted as W₁, a second waveform modulation signal, denoted as W₂, and a control signal, denoted as CS;

train a channel equalizer based on the control signal CS;

perform channel equalization on the first waveform modulation signal W₁, the second waveform modulation signal W₂, and the control signal CS;

perform time-domain de-multiplexing on the first waveform modulation signal W₁, the second waveform modulation signal W₂, and the control signal CS;

apply a rounding function to the first waveform modulation signal W₁;

generate a recovered signal, denoted as S, by summing the first waveform modulation signal W₁ and the second waveform modulation signal W₂;

recover data from the recovered signal S; and

recover control information by demodulating the control signal CS.

7. The communication device of claim 6, wherein the processor is further configured to divide the first waveform modulation signal W₁ by a first factor, denoted as c₁;

prior to generating the recovered signal S.

8. The communication device of claim 7, wherein the processor is further configured to divide the second waveform modulation signal W₂ by a second factor, denoted as c₂, prior to generating the recovered signal S.

9. The communication device of claim 8, wherein the processor is further configured to divide the control signal CS by a third factor, denoted as c₃, prior to recovering the control information.

10. The communication device of claim 6, wherein the processor is further configured to perform frequency down-conversion on the CWM-CS received from the communication link.

11. The communication device of claim 6, wherein the processor is further configured to perform pulse shaping on the CWM-CS received from the communication link.

12. The communication device of claim 6, wherein the processor is further configured to perform down-sampling on the CWM-CS received from the communication link.