Method and apparatus for simulating radio channel

• US 20050008109A1
• Filed: 05/25/2004
• Published: 01/13/2005
• Est. Priority Date: 11/27/2001
• Status: Active Grant

• Current Assignee: Keysight Technologies Singapore (Holdings) Pte. Limited. (Keysight Technologies, Inc.)
• Original Assignee: Elektrobit Incorporated (Bittium Oyj)
• Inventors: Harju, Jussi, Kemppainen, Juha, Poutanen, Torsti
• Granted Patent: US 7,394,880 B2
• Time in Patent Office: Days
• US Class Current: 375/350
• CPC Class Codes: H04B 17/0087 using auxiliary channels or channel simulators

Abstract

A radio channel simulator configured to read radio channel data describing a radio channel and user data including at least one user signal, and to simulate the radio channel using a FIR filter comprising one or more FIR blocks for filtering the user data read based on radio channel data in connection with the simulation. The radio channel simulator is configured to transfer at least one FIR block at a delay level depicting a radio channel delay during simulation.

Claims

1. A method for simulating a radio channel, comprising:

simulating the radio channel utilizing user data describing radio signal and radio channel data describing the radio channel at different instants of time, and the simulation filtering the user data using one or more FIR blocks in a FIR filter based on the radio channel data;

analysing the radio channel data before simulation and/or during simulation for localizing significant user data values in respect of the radio channel at different instants of time; and

transferring at least one of the FIR blocks at a delay level depicting a radio channel delay during simulation in such a manner that the FIR blocks cover the localized significant user data values.

2. A method as claimed in claim 1, wherein a FIFO delay parameter is used to set the delay of the FIR block for transferring the block at the delay level.

3. A method as claimed in claim 1, comprising allocating only the number of required FIR blocks for the simulation at each instant of time, and releasing the unused FIR blocks from use.

4. A radio channel simulator comprising:

means for reading radio channel data describing a radio channel and user data including at least one user signal;

a FIR filter for simulating the radio channel, the FIR filter comprising one or more FIR blocks for filtering the user data read based on the radio channel data in connection with the simulation;

means for analysing the radio channel data in advance before simulation and/or during simulation for localizing significant user data values in respect of the radio channel at different instants of time; and

allocation means for allocating said one or more FIR blocks for filtering purposes, the allocation means being arranged to transfer at least one FIR block at a delay level depicting a radio channel delay during simulation in such a manner that one or more FIR blocks cover the localized significant data values.

5. A radio channel simulator as claimed in claim 4, wherein the allocation means are arranged to transfer the FIR block at the delay level by setting a FIFO delay parameter.

6. A radio channel simulator as claimed in claim 4, wherein the allocation means are arranged to employ an appropriate number of FIR blocks at each instant of time used for simulation and to release such FIR blocks, which are not required at said instant of time.

7. A radio channel simulator, configured to:

read radio channel data describing a radio channel and user data including at least one user signal;

simulate the radio channel using a FIR filter comprising one or more FIR blocks for filtering the user data read based on the radio channel data in connection with the simulation;

analyse the radio channel data in advance before simulation and/or during simulation for localizing significant user data values in respect of the radio channel at different instants of time; and

transfer at least one FIR block at a delay level depicting a radio channel delay during simulation in such a manner that one or more FIR blocks cover the localized significant data values.

8. A radio channel simulator as claimed in claim 7, wherein the radio channel simulator is configured to transfer the FIR block at the delay level by setting a FIFO delay parameter.

9. A radio channel simulator as claimed in claim 7, wherein the radio channel simulator is configured to employ an appropriate number of FIR blocks at each instant of time used for simulation and to release such FIR blocks, which are not required at said instant of time.