DEVICE FOR MODIFYING TRAJECTORIES

• US 20140355718A1
• Filed: 09/12/2012
• Published: 12/04/2014
• Est. Priority Date: 09/12/2011
• Status: Abandoned Application

• Current Assignee: RWTH Aachen University
• Original Assignee: RWTH Aachen University
• Inventors: Negra, Renato, Guan, Junqing
• Application Number:
  US14/344,543
• Publication Number:
  US 20140355718A1
• Time in Patent Office: Days
• US Class Current: 375/300
• CPC Class Codes: H03C 5/00 Amplitude modulation and angle modulation produced simultaneously or at will by the same modulating signal H03C7/00 takes precedence
• CPC Class Codes: H03F 1/0211 with control of the supply voltage or current
• CPC Class Codes: H03F 1/0294 using vector summing of two or more constant amplitude phase-modulated signals
• CPC Class Codes: H03F 1/3288 to compensate phase shift as a function of the amplitude
• CPC Class Codes: H03F 3/24 of transmitter output stages
• CPC Class Codes: H04L 27/36 Modulator circuits; Transmitter circuits
• CPC Class Codes: H04L 27/361 Modulation using a single or unspecified number of carriers, e.g. with separate stages of phase and amplitude modulation

Abstract

The invention relates to a device for modifying trajectories.

Claims

1. Device for modifying trajectories (T-MOD) for use in a transmitting device of a digital transmission device, wherein the signals to be transmitted are modulated digitally and complexly, wherein a trajectory occurs with a change from a first signal state to a second signal state, comprising:

a first input (I₁;

I₃) and a second input (I₂, I₄) for receiving components of a complex signal to be transmitted,

a first output (O₁) for making available an amplitude component of a modified signal to be transmitted,

second output (O₂) for making available a phase component of a modified signal to be transmitted, and

a processing unit which makes modified components available based on the received components of the signal to be transmitted, wherein trajectories that pass near the origin or touch the origin are modified such that the modified trajectory passes by the origin at a greater distance.

2. Device as set forth in claim 1, wherein the modified trajectories do not touch a nearly circular region around the origin.

3. Device as set forth in claim 1, wherein the processing unit uses one or more signal states of the received components for the calculation of the modified trajectory.

4. Device as set forth in claim 1, wherein the modified trajectory is substantially unchanged in the region of the first and the second signal state.

5. Device as set forth in claim 1, wherein the maximum phase change between two adjacent signal states as well as the minimum amplitude is limited.

6. Device as set forth in claim 5, wherein the required number of signal states is determined dynamically based on the boundary conditions, so that the modified trajectory lies as close as possible to the original trajectory.

7. Device as set forth in claim 1, wherein the quadrature components are obtained from the amplitude component of a signal to be transmitted and the phase component of the signal to be transmitted.

8. Device as set forth in claim 1, wherein quadrature components are received directly at the first and the second input (I₁, I₂;

I₃, I₄) and the amplitude component and the phase component of the signal to be transmitted are obtained from a polar conversion.

9. Device as set forth in claim 1, wherein the processing unit is an FPGA, DSP, ASIC, microcontroller, microprocessor or the like.

10. Device as set forth in claim 1, wherein the device is intended for use in a wireless or wired digital transmission system.