Flexible-bandwidth radio

• US 5,208,804 A
• Filed: 10/30/1990
• Issued: 05/04/1993
• Est. Priority Date: 10/30/1990
• Status: Expired due to Term

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Wilson, Timothy J., Thro, Stuart W.
• Primary Examiner(s): Olms, Douglas W.
• Assistant Examiner(s): HSU, ALPUS
• Application Number:
  US07/605,893
• Time in Patent Office: 917 Days
• Field of Search: 370/24, 370/30, 370/69.1, 370/120, 370/121, 370/70, 370/76, 370/84, 370/112, 370/118, 375/38, 375/39, 375/40, 375/8
• US Class Current: 370/343
• CPC Class Codes: H04B 7/2621 using frequency division multiple access [FDMA] H04B7/2615 takes precedence

Abstract

A flexible-bandwith radio is provided. Briefly, the radio is equipped with a multiplicity of modulator and demodulator units arranged to communicate on a multiplicity of discrete frequency bands. There is no need for the individual frequency bands to be contiguous. As a result, the radio is able to simultaneously supporting a multiplicity of band-limited radio channels. The radio is further equipped with a channel combiner unit and a channel divider unit to combine the individual channels to form a high-capacity aggregate channel. The aggregate channel is then provided to the user, or to a user application. In a first embodiment, the radio utilizes a multiplicity of discrete modulator, demodulator, combiner, and divider units. In a second embodiment, the radio utilizes a suitably-programmed digital signal processor to perform the equivalent modulator, demodulator, combiner, and divider functions.

Claims

1. In a radio arranged to transmit in a radio frequency band, the radio frequency band including a set of n predetermined radio frequency channels, each of the n predetermined radio frequency channels being capable of supporting a predetermined data rate, a method for the radio to transmit an aggregate signal via the n predetermined radio frequency channels, the aggregate signal having an aggregate data rate which exceeds the predetermined data rate of any individual radio frequency channel of the set of n predetermined radio frequency channels, the method comprising the steps of:

(a) forming a multiplicity of n signals, each of the multiplicity of n signals being based on said aggregate signal;

(b) modulating each of the n signals to form n modulated signals; and

,

(c) transmitting said n modulated signals via said n predetermined radio frequency channels, each of said n modulated signals being transmitted on exactly one radio frequency channel,

wherein said forming step (a) and said modulating step (b) are performed substantially by a digital signal processor.

2. The method of claim 1, at least some of said n predetermined radio frequency channels being non-contiguous and non-adjacent.

3. The method of claim 2, each of the multiplicity of n signals having a data rate of 1/n the aggregate data rate.

4. In a radio arranged to receive in a radio frequency band, the radio frequency band including a set of n predetermined radio frequency channels, each of the n predetermined radio frequency channels being capable of supporting a predetermined data rate, a method for the radio to receive a set of n modulated signals via the n predetermined radio frequency channels and to form an aggregate signal, the aggregate signal having an aggregate data rate which exceeds the predetermined data rate of any individual radio frequency channel of the set of n predetermined radio frequency channels, the method comprising the steps of:

(a) receiving said n modulated signals via said n predetermined radio frequency channels, each of the n modulated signals being received on exactly one radio frequency channel;

(b) demodulating each of the n modulated signals to form n demodulated signals; and

,

(c) forming an aggregate signal based on said n demodulated signals,

wherein said demodulating step (b) and said forming step (c) are performed substantially by a digital signal processor.

5. The method of claim 4, at least some of said n predetermined radio frequency channels being non-contiguous and non-adjacent.

6. The method of claim 5, each of the n demodulated signals having a data rate of 1/n the aggregate data rate.

7. A radio arranged to transmit in a radio frequency band, the radio frequency band including a set of n predetermined radio frequency channels, each of the n predetermined radio frequency channels being capable of supporting a predetermined data rate, the radio arranged for transmitting an aggregate signal via the n predetermined radio frequency channels, the aggregate signal having an aggregate data rate which exceeds the predetermined data rate of any individual radio frequency channel of the set of n predetermined radio frequency channels, the radio comprising:

forming means for forming a multiplicity of n signals, each of the multiplicity of n signals being based on said aggregate signal;

modulating means for modulating each of the n signals to form n modulated signals; and

,

transmitting means for transmitting said n modulated signals via said predetermined radio frequency channels, each of said n modulated signals being transmitted on exactly one channel

wherein said forming means and said modulating means are substantially comprised by a digital signal processor.

8. The radio of claim 7, at least some of said n predetermined radio frequency channels being non-contiguous and non-adjacent.

9. The radio of claim 8, each of the multiplicity of n signals having a data rate of 1/n the aggregate data rate.

10. The radio of claim 9, said radio being a trunked-type radio.

11. A radio arranged to receive in a radio frequency band, the radio frequency band including a set of n predetermined radio frequency channels, each of the n predetermined radio frequency channels being capable of supporting a predetermined data rate, the radio being arranged for receiving a set of n modulated signals via the n predetermined radio frequency channels and forming an aggregate signal, the aggregate signal having an aggregate data rate which exceeds the predetermined data rate of any individual radio frequency channel of the set of n predetermined radio frequency channels, the radio comprising:

receiving means for receiving said n modulated signals via said predetermined radio frequency channels, each of the n modulated signals being received on exactly one radio frequency channel;

demodulating means for demodulating each of the n modulated signals to form n demodulated signals; and

,

forming means for forming an aggregate signal based on said n demodulated signals,

wherein said demodulating means and said forming means are substantially comprised by a digital signal processor.

12. The radio of claim 11, at least some of said n predetermined radio frequency channels being non-contiguous and non-adjacent.

13. The radio of claim 12, each of the n demodulated signals having a data rate of 1/n the aggregate data rate.

14. The radio of claim 13, said radio being a trunked-type radio.

15. A radio arranged to transmit in a radio frequency band, the radio frequency band including a set of n predetermined channels, each of the n predetermined radio frequency channels being capable of supporting a predetermined data rate, the radio arranged for transmitting an aggregate signal having an aggregate data rate which exceeds the predetermined data rate of any individual radio frequency channel of the set of n predetermined radio frequency channels, the radio comprising:

a digital signal processor including;

software means for forming a multiplicity of n signals, each of the multiplicity of n signals being based on said aggregate signal, and

software means for modulating each of the n signals to form n modulated signals; and

,

transmitting means for transmitting said n modulated signals via said n predetermined radio frequency channels, each of said n modulated signals being transmitted on exactly one radio frequency channel.

16. A radio arranged to receive in a radio frequency band, the radio frequency band including a set of n predetermined radio frequency channels, each of the n predetermined radio frequency channels being capable of supporting a predetermined data rate, the radio being arranged for receiving a set of n modulated signals via the n predetermined radio frequency channels and for forming an aggregate signal, the aggregate signal having an aggregate data rate which exceeds the predetermined data rate of any individual radio frequency channel of the set of n predetermined radio frequency channels, the radio comprising:

a digital signal processor including;

software means for receiving said n modulated signals via said n predetermined radio frequency channels, each of the n modulated signals being received on exactly one radio frequency channel, and

software means for demodulating each of the n modulated signals to form n demodulated signals; and

,

forming means for forming an aggregate signal based on said n demodulated signals.

17. A radio arranged to transmit in a radio frequency band, the radio frequency band including a set of n predetermined channels, each of the n predetermined radio frequency channels being capable of supporting a predetermined data rate, the radio arranged for transmitting an aggregate signal having an aggregate data rate which exceeds the predetermined data rate of any individual radio frequency channel of the set of n predetermined radio frequency channels, the radio comprising:

a digital signal processor programmed for forming a multiplicity of n signals, each of the multiplicity of n signals being based on said aggregate signal, and for modulating each of the n signals to form n modulated signals; and

,

transmitting means for transmitting said n modulated signals via said n predetermined radio frequency channels, each of said n modulated signals being transmitted on exactly one radio frequency channel.

18. A radio arranged to receive in a radio frequency band, the radio frequency band including a set of n predetermined radio frequency channels, each of the n predetermined radio frequency channels being capable of supporting a predetermined data rate, the radio being arranged for receiving a set of n modulated signals via the n predetermined radio frequency channels and for forming an aggregate signal, the aggregate signal having an aggregate data rate which exceeds the predetermined data rate of any individual radio frequency channel of the set of n predetermined radio frequency channels, the radio comprising:

a digital signal processor programmed for receiving said n modulated signals via said n predetermined radio frequency channels, each of the n modulated signals being received on exactly one radio frequency channel, and for demodulating each of the n modulated signals to form n demodulated signals; and

,

forming means for forming an aggregate signal based on said n demodulated signals.