Repeater with digital channelizer

• US 20030236067A1
• Filed: 06/20/2002
• Published: 12/25/2003
• Est. Priority Date: 06/20/2002
• Status: Active Grant

• Current Assignee: Axell Wireless Limited (Cobham PLC)
• Original Assignee: Dekolink Wireless Ltd. (Cobham PLC)
• Inventors: Baber, Alex, Hasarchi, Abraham
• Granted Patent: US 6,873,823 B2
• Time in Patent Office: Days
• US Class Current: 455/10
• CPC Class Codes: H03H 17/0294 Variable filters; Programmable filters
• CPC Class Codes: H04B 1/001 Channel filtering, i.e. selecting a frequency channel within the SDR system multiplexing of multicarrier modulation signals being represented by different frequencies H04L5/06; multiplexing of multicarrier modulation signals H04L5/023
• CPC Class Codes: H04B 1/109 by improving strong signal performance of the receiver when strong unwanted signals are present at the receiver input
• CPC Class Codes: H04B 7/15542 Selecting at relay station its transmit and receive resources selection of wireless resources by user or terminal H04W72/02; arrangements affording multiple use of the transmission path by two-dimensional division of the resources H04L5/0003, or by allocating sub-channels H04L5/003

Abstract

In order to retransmit a communication channel at a specific frequency, a receiver may receive a signal including the communication channel'"'"'s specific frequency. An analog to digital converter may generate a digital signal correlated to the received signal and the digital signal may be passed through a digital filter configured to filter the digital signal and pass frequency components at or around the frequency of the communication channel'"'"'s specific frequency. A digital to analog converter may generate an analog signal correlated to the filtered digital signal and a transmitter may transmit the analog signal.

Claims

1. A method of retransmitting a communication channel at a specific frequency, said method comprising:

receiving a signal including the communication channel'"'"'s specific frequency;

generating a digital signal correlated to the received signal;

filtering the digital signal with a digital filter configured to pass frequency components at or around the frequency of the communication channels specific frequency;

generating an analog signal correlated to the filtered digital signal; and

transmitting the analog signal correlated to the filtered digital signal.

2. The method according to claim 1, further comprising down-converting the received signal to an intermediate frequency prior to generating a digital signal.

3. The method according to claim 2, further comprising up-converting the analog signal correlated to the filtered digital signal prior to transmitting the analog signal.

4. The method according to claim 1, further comprising filtering the digital signal with a digital filter configured to pass frequency components at or around a second frequency associated with a second communication channel.

5. The method according to claim 4, further comprising combining the digital signals out from each of said filtering steps and generating an analog signal correlated to the combined digital signal.

6. The method according to claim 5, further comprising transmitting the analog signal correlated to the combined digital signal.

7. A system for retransmitting a communication channel at a specific frequency, said system comprising:

a receiver to receive a signal including the communication channel'"'"'s specific frequency;

an analog to digital converter to generate a digital signal correlated to the received signal;

a digital filter configured to filter the digital signal and pass frequency components at or around the frequency of the communication channel'"'"'s specific frequency;

a digital to analog converter to generate an analog signal correlated to the filtered digital signal; and

a transmitter to transmit the analog signal correlated to the filtered digital signal.

8. The system according to claim 7, further comprising a down converter to convert the received signal to an intermediate frequency.

9. The system according to claim 8, further comprising an up converter to convert the analog signal correlated to the filtered digital signal to a tranmission frequency.

10. The system according to claim 7, further comprising a second digital filter configured to pass frequency components at or around a second frequency associated with a second communication channel.

11. The system according to claim 10, futher comprising a summing unit to combine outputs from said first and second digital filters.