Presenting an output signal generated by a receiving device in a simulated communication system

• US 6,199,032 B1
• Filed: 07/22/1998
• Issued: 03/06/2001
• Est. Priority Date: 07/23/1997
• Status: Expired due to Fees

• Current Assignee: EDX Wireless, LLC
• Original Assignee: EDX Engineering, Inc. (Comarco Incorporated)
• Inventors: Anderson, Harry R.
• Primary Examiner(s): Teska, Kevin J.
• Assistant Examiner(s): Broda, Samuel
• Application Number:
  US09/120,826
• Time in Patent Office: 958 Days
• Field of Search: 703/13, 703/18, 703/20, 703/21, 703/22, 703/2, 703/4, 703/5, 455/449, 375/219, 342/359, 707/103
• US Class Current: 703/21
• CPC Class Codes: H04W 16/18 Network planning tools

Abstract

A computer software program simulates a communication network using network characteristic information provided by communication network designers. When a network designer selects a particular location within the network, the software consults the network characteristic information to predict a signal attribute of a simulated signal received at the selected location. The predicted attribute is used to modify a template signal to produce a simulated output signal, and the simulated output signal is presented for consideration by the network designers.

Claims

1. A computer-implemented method for predicting signal reception in a simulated communication system represented by communication system parameters stored in a computer system, the method comprising:

determining from an input device a simulation location value indicative of a selected location in the communication system;

calculating, from the simulation location value and the communication system parameters, a predicted signal attribute value of a signal received by a receiving device at the selected location; and

generating a simulated output signal of a receiving device for presentation at an output device, the simulated output signal exhibiting the predicted signal attribute value.

2. The method of claim 1 wherein the simulated output signal is generated by modifying a model signal frame according to the predicted signal attribute value.

3. The method of claim 1 further comprising:

collecting the communication system parameters from a user, the communication system parameters defining elements of the communication system, the elements comprising representations of a plurality of radio transmit stations in a wireless communication system.

4. The method of claim 1 wherein the communication system comprises elements and the simulation location value indicates a logical location within elements of the communication system.

5. The method of claim 1 wherein plural predicted signal attribute values for plural locations are calculated seriatim from a stored data file of plural simulation location values comprising a geographical simulation route in the communication system.

6. The method of claim 1 wherein the simulation location value indicates a first geographical location;

calculating the predicted signal attribute value comprises calculating a power level of a signal simulated as received by a receiving device at the first geographical location from a transmitter at a second geographical location; and

generating the simulated output signal comprises adding noise to a reference data frame to generate a simulated data frame for presentation at an output device, severity of the noise correlating to the power level.

7. The method of claim 6 wherein the simulated data frame is one of a plurality of simulated image frames, the method further comprising:

presenting the simulated image frames at a video output device to simulate reception of a video signal.

8. The method of claim 6 wherein the simulated data frame is one of a plurality of simulated sound frames, the method further comprising:

presenting the simulated sound frames at an audio output device to simulate reception of an audio signal.

9. A computer-readable medium having computer-executable instructions for performing the following actions to predict signal reception in a communication system represented by communication system parameters stored in a computer system:

determining from an input device a simulation location value indicative of a selected location in the communication system;

calculating, from the simulation location value and the communication system parameters, a predicted signal attribute value of a signal received by a receiving device at the selected location; and

generating a simulated output signal of a receiving device for presentation at an output device, the simulated output signal exhibiting the predicted signal attribute value.

10. A computer-readable medium having computer-executable instructions for performing the following actions to predict signal reception in a communication system represented by communication system parameters stored in a computer system:

determining from an input device a simulation location value indicative of a selected location in the communication system;

calculating, from the simulation location value and the communication system parameters, a predicted signal attribute value of a signal received by a receiving device at the selected location; and

generating a simulated output signal of a receiving device for presentation at an output device, the simulated output signal exhibiting the predicted signal attribute value;

wherein the simulation location value indicates a first geographical location;

calculating the predicted signal attribute value comprises calculating a power level of a signal simulated as received by a receiving device at the first geographical location from a transmitter at a second geographical location;

generating the simulated output signal comprises adding noise to a reference data frame to generate a simulated data frame for presentation at an output device, severity of the noise correlating to the power level; and

wherein the simulated data frame is one of a plurality of simulated sound frames, the method further comprising;

presenting the simulated sound frames at an audio output device to simulate reception of an audio signal.

11. In a computer, a system for simulating signal reception at a selected location in a simulated communication system represented by communication system parameters stored on the computer, the system comprising:

a location selector operable for receiving a location in the communication system and generating a location value indicative of the location;

a received signal attribute calculator responsive to the location value and operable for calculating a predicted signal attribute value for a signal simulated as received by a receiving device in the communication system at the location; and

an output signal generator responsive to the predicted signal attribute value and operable for generating an output signal simulated as output by a receiving device and manifesting the predicted signal attribute value.

12. The system of claim 11 further comprising:

a model data frame, wherein the output signal generator generates the output signal by performing a convolution operation on the model data frame.

13. The system of claim 11 further comprising:

a model data frame; and

an interference calculator operable for determining an interference power at the location, wherein the output signal generator is operable for generating the output signal by performing a convolution operation on the model data frame to generate a simulated input signal frame and adding noise to the input signal frame according to the interference power to generate an output signal frame.

14. The system of claim 13 further comprising:

a receiver noise generator operable for simulating receiver noise from user-supplied parameters and adding the receiver noise to the output frame.

15. The system of claim 11 wherein the location selector is further operable for reading a stored set of geographical locations forming a route of a simulated radio frequency receiver and generating seriatim location values indicative of locations on the route.

16. The system of claim 11 further comprising:

a system map generator operable for presenting a pictorial representation of the simulated communication system, wherein the location selector is operable for receiving a user selection from the pictorial representation associated with a location in the communication system.

17. The system of claim 11 further comprising:

a set of ordered model data frames representing a transmitted signal, wherein the output signal generator selects, seriatim and in order, a data frame from the set to simulate reception of the transmitted signal.

18. The system of claim 17 wherein the location selector is further operable for reading a stored set of geographical locations forming a route of a simulated radio frequency receiver and generating seriatim location values indicative of locations on the route.

19. A computer implemented method for presenting to a computer user an output signal simulated as received by a receiving device in a simulated communication system having a plurality of simulated radio frequency transmitters, the method comprising:

presenting a system map for representing the simulated communication system;

determining from an input pointing device a simulation location value indicative of a position on the system map selected by the user and associated with a geographical location;

calculating from the simulation location value a predicted channel response value indicative of channel response of a signal simulated as received by a receiving device at the selected geographical location from one of the transmitters;

modifying a model signal frame with the channel response using a convolution function to generate a simulated input signal frame;

calculating from the simulation location value a predicted interference value indicative of interference to a signal simulated as received at the selected geographical location;

generating a simulated signal composite frame from the simulated input signal frame with the predicted interference value using a random number generator to simulate interference;

adding simulated receiver noise to the signal composite frame according to receiver noise characteristics to generate a simulated output signal frame; and

presenting the simulated output signal frame to the user as part of an audio video presentation.

20. A computer-readable medium having computer-executable instructions for performing the following actions to present to a computer user an output signal simulated as received by a receiving device in a simulated communication system having a plurality of simulated radio frequency transmitters:

presenting a system map for representing the simulated communication system;

determining from an input pointing device a simulation location value indicative of a position on the system map selected by the user and associated with a geographical location;

calculating from the simulation location value a predicted channel response value indicative of channel response of a signal simulated as received by a receiving device at the selected geographical location from one of the transmitters;

modifying a model signal frame with the channel response using a convolution function to generate a simulated input signal frame;

calculating from the simulation location value a predicted interference value indicative of interference to a signal simulated as received at the selected geographical location;

generating a simulated signal composite frame from the simulated input signal frame with the predicted interference value using a random number generator to simulate interference;

adding simulated receiver noise to the signal composite frame according to receiver noise characteristics to generate a simulated output signal frame; and

presenting the simulated output signal frame to the user as part of an audio video presentation.