Signal transmission apparatus, carrier phase recovery apparatus and method

Patent metadata

Field	Value
Publication number	US-10367635-B2
Application number	US-201715443322-A
Country	US
Kind code	B2
Filing date	Feb 27, 2017
Priority date	Feb 29, 2016
Publication date	Jul 30, 2019
Grant date	Jul 30, 2019

Abstract

Embodiments of this disclosure provide a signal transmission apparatus, a carrier phase recovery apparatus and method. By inserting phase modulation signals with variable amplitudes into data modulation signals and performing carrier phase recovery on received signals at a receiving end according to the phase modulation signals, the apparatuses and methods are applicable to communications systems of various modulation formats and are compatible with existing communications systems, and calculation complexity is relatively low. Furthermore, as the amplitudes of the inserted phase modulation signals are variable, the phase modulation signals may be flexibly configured in data modulation signals, to lower redundancy and influence on the system capacity is relatively small.

First claim

The invention claimed is:

1. A signal transmission apparatus, comprising:
a memory that stores a plurality of instructions;
a processor that couples to the memory and causes the signal transmission apparatus to:
insert at least one phase modulation signal with at least one variable amplitude into data modulation signals, to perform carrier phase recovery at a receiving end, and
transmit transmission signals formed after the at least one phase modulation signal is inserted into the data modulation signals,

wherein the at least one phase modulation signal is among at least two of phase modulation signals inserted into the data modulation signal,
wherein the at least two phase modulation signals have at least one of multiple amplitudes or a single amplitude, and
wherein a phase difference between any two phase modulation signals in the at least phase modulation signals is

m
⁢

⁢
π

n

;

where, m and n are non-zero integers.

2. The signal transmission apparatus according to claim 1 , wherein constellation points of the at least two phase modulation signals coincide with specific constellation points in a constellation diagram of the data modulation signals.

3. The signal transmission apparatus according to claim 1 , wherein the processor causes the signal transmission apparatus to insert the at least two phase modulation signals into the data modulation signals in a consecutive or spaced manner in a time domain.

4. The signal transmission apparatus according to claim 1 , wherein a proportion of the at least two phase modulation signals in the transmission signals is variable.

5. The signal transmission apparatus according to claim 1 , wherein the processor further causes the apparatus to determine positions of the at least two phase modulation signals in the constellation diagram of the data modulation signals, so that a bit error rate of the receiving end is minimum when the at least two phase modulation signals are at said positions.

6. A transmitter, comprising the signal transmission apparatus as claimed in claim 1 .

Assignees

• Fujitsu Ltd

Inventors

• Su Xiaofei
• Dou Liang
• Tao Zhenning

Classifications

• H04L2025/03401

  PSK · CPC title

• H04L27/3827

  in which the carrier is recovered using only the demodulated baseband signals · CPC title

• H04L27/361

  Modulation using a single or unspecified number of carriers, e.g. with separate stages of phase and amplitude modulation · CPC title

• H04L27/3405

  Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power · CPC title

• H04L27/2082 Primary

  for offset or staggered quadrature phase shift keying · CPC title