Multi-protocol receiver

• US 6,914,950 B1
• Filed: 07/31/2000
• Issued: 07/05/2005
• Est. Priority Date: 07/31/2000
• Status: Expired due to Fees

• Current Assignee: Lyrtech
• Original Assignee: Lyrtech
• Inventors: Luneau, Louis
• Primary Examiner(s): Ghebretinsae, Temesghen
• Assistant Examiner(s): Ahn, Sam K.
• Application Number:
  US09/629,892
• Time in Patent Office: 1,800 Days
• Field of Search: 375/240, 375/7, 375/241, 375/316, 375/324, 375/325, 375/326, 375/343, 375/347, 375/350, 375/136, 375/147, 375/148, 375/149, 375/150, 375/152, 375/144, 375/260, 375/267, 375/349, 455/132, 455/500
• US Class Current: 375/347
• CPC Class Codes: H04B 1/0057 using diplexing or multiplexing filters for selecting the desired band

Abstract

A multi-protocol receiver system for receiving wireless communications. The system comprises programmable stages for controlling each steps of the demodulation of at least one broadband signal to provide the I and Q signals of at least one specific frequency narrow band for further processing. The receiver can be used in a software defined radio system.

Claims

1. A multi-protocol receiver for receiving wireless transmissions comprising:

a plurality of RF receiver units each receiving a wireless signal and outputting a broadband IF signal;

a plurality of tunable down converter units, each able to tune over a frequency range of all of said broadband IF signal of all of said RF receiver units, and said plurality of tunable down converter units output raw I and Q signals;

a plurality of tunable filters receiving said raw I and Q signals from one of said plurality of tunable down converter units and providing filtered I and Q output signals;

a switch for coupling a selected RF receiver unit of said plurality of RF receiver units to a selected one of said plurality of tunable down converter units; and

a management unit receiving a request for a specific frequency band and setting a tuning frequency of a selected one of said plurality of tunable down converter units, setting filter parameters of a selected one of said plurality of tunable filters, and setting said switch.

2. The multi-protocol receiver as claimed in claim 1, further comprising a plurality of ADC units each connected to one of said plurality of RF receiver units, wherein said switch connects a broadband digital output of said plurality of ADC units to said plurality of tunable down converter units.

3. The multi-protocol receiver as claimed in claim 2, wherein the management unit comprises:

a channel selection signal input;

a memory for storing said filter parameters for channels from said broadband IF signal of all of said RF receiver units and frequency parameters for all of said tunable down converter units and switch parameters;

an interpreter receiving said selection signal and setting said filter parameters, said tunable down converters, and said switch parameters based on data stored in said memory.

4. The multi-protocol receiver as claimed in claim 3, wherein there are at least two of said tunable down converter units in order to receive full duplex conversations, said memory for storing switch parameters provides information for allocating said at least two of said tunable down converter units to said full duplex conversations.

5. The multi-protocol receiver as claimed in claim 2, wherein there are at least two of said tunable down converter units in order to receive full duplex conversations.

6. The multi-protocol receiver as claimed in claim 2, wherein a tunable filter of said plurality of tunable filters is an N tap FIR filter.

7. The multi-protocol receiver as claimed in claim 2, wherein said switch is an FPGA.

8. The multi-protocol receiver as claimed in claim 2, wherein each of said ADC units performs the conversion at a rate of at least 50 MHz.

9. The multi-protocol receiver as claimed in claim 1, wherein the management unit comprises:

a channel selection signal input;

a memory for storing said filter parameters for channels from said broadband IF signal of all of said RF receiver units and frequency parameters for all of said tunable down converter units and switch parameters;

an interpreter receiving a selection signal and setting said filter parameters, said tunable down converters, and said switch parameters based on data stored in said memory.

10. The management unit as claimed in claim 9, wherein the interpreter is a Digital Signal Processor (DSP).

11. The multi-protocol receiver as claimed in claim 1, wherein there are at least two of said tunable down converter units in order to receive full duplex conversations.

12. The multi-protocol receiver as claimed in claim 1, wherein a plurality of said RF receiver units, each receives a portion of a single frequency band.

13. The multi-protocol receiver as claimed in claim 1, wherein a single frequency band, larger than one handled by a single one of said RF receiver unit, is handled by a plurality of said RF receiver units.

14. The multi-protocol receiver as claimed in claim 1, wherein each of said RF receiver units handles at least 25 MHz bandwidth signal.

15. A method for receiving a wireless communication with a device which comprises a plurality of RF receiver units, a plurality of tunable down converter units, a plurality of tunable filters, a switch and comprising the steps of:

receiving a request for a specific frequency band and setting a tuning frequency of a selected one of said plurality of tunable down converter units;

setting filter parameters of a selected one of said plurality of tunable filters;

setting said switch in order to couple one of said plurality of RF receiver units to one of said plurality of tunable down converter units;

receiving a wireless signal from an antenna and outputting an IF broadband signal;

down converting the IF broadband signal to provide raw I and Q signals; and

filtering the raw I and Q signals to provide filtered I and Q signals.

16. A method as claimed in claim 15 additionally comprising the step of:

digitizing said IF broadband signal by an ADC unit before said switching.

17. A method as claimed in claim 16, wherein the step of switching said switch is directed by a management unit.

18. A method as claimed in claim 15, wherein the step of switching said switch is directed by a management unit.