Hybrid spread spectrum method and system for wirelessly transmitting and receiving wideband digital data

• US 20020001337A1
• Filed: 07/31/2001
• Published: 01/03/2002
• Est. Priority Date: 08/19/1998
• Status: Abandoned Application

• Current Assignee: Interair Wireless, Inc.
• Original Assignee: Interair Wireless, Inc.
• Inventors: Chauncey, David C., Hoen, Christopher P., Doane, James R.
• Application Number:
  US09/919,120
• Publication Number:
  US 20020001337A1
• Time in Patent Office: Days
• US Class Current: 375/132
• CPC Class Codes: H04K 1/02 by adding a second signal to make the desired signal unintelligible
• CPC Class Codes: H04K 3/25 based on characteristics of target signal or of transmission as countermeasure against surveillance H04K3/827, e.g. using direct sequence spread spectrum or fast frequency hopping spread spectrum techniques H04B1/69
• CPC Class Codes: H04L 5/003 Arrangements for allocating sub-channels of the transmission path

Abstract

A “software” radio in the form of a system is completely configurable and controllable in real-time by software and has a coordination capability to enable scaling to network aggregate data rates in the 10s of megabits per second per base station with no interference among the multiple radios. Base stations can, in turn, be time and frequency coordinated. Scalability is provided by the addition of substantially identical relay radios at each base station. A hybrid spread spectrum method and system of the invention include a protocol which facilitates coordinated frequency hopping. The system does not dwell more than a few milliseconds at any frequency center to achieve high scalability of the system in, for example, a metropolitan area. A single coaxial cable feeds control signals, electrical power signals and RF signals to a microwave antenna to reduce system hardware and installation costs.

Claims

1. A hybrid spread spectrum method for wirelessly transmitting wideband digital, the method comprising the steps of:

formatting the digital data based on a predetermined protocol;

dynamically allocating bandwidth to the formatted digital data based on a predetermined set of conditions;

coding the formatted digital data with a signal to obtain encoded digital data;

transmitting the encoded digital data at a plurality of different frequency bands, each of which has a center frequency so that each bit of digital data is sent at each of the different frequency bands substantially simultaneously; and

dynamically changing the center frequencies in real-time in less than 100 milliseconds.

2. The method of claim 1 wherein the step of dynamically changing is performed in less than 10 milliseconds.

3. A hybrid spread spectrum method for receiving wideband digital data by reversing the steps of the method of claim 1.

4. A hybrid spread spectrum system for wirelessly transmitting wideband digital data, the system comprising:

means for formatting the digital data based on a predetermined protocol to obtain formatted digital data;

means for dynamically allocating bandwidth to the formatted digital data based on a predetermined set of conditions;

means for coding the formatted digital data with a signal to obtain encoded digital data;

means for transmitting the encoded digital data at a plurality of different frequence bands, each of which has a center frequency so that each bit of digital data is sent at each of the different frequencies substantially simultaneously; and

means for dynamically changing the center frequencies in real-time in less than 100 milliseconds.

5. The system as claimed in claim 4 wherein the means for dynamically changing changes the center frequencies in less than 10 milliseconds.

6. A hybrid spread spectrum system for wirelessly receiving encoded formatted wideband digital data, the system comprising:

means for decoding the encoded formatted digital data with a signal to obtain decoded formatted digital data;

means for deformatting the decoded formatted digital data based on a predetermined protocol to obtain the digital data;

means for dynamically deallocating bandwidth to the encoded formatted digital data based on a predetermined set of conditions;

means for receiving the wideband encoded formatted digital data at a plurality of different frequency bands, each of which has a center frequency so that each bit of digital data is received at several different frequency bands substantially simultaneously; and

means for dynamically changing the center frequencies in real-time in less than 100 milliseconds.

7. The system as claimed in claim 6 wherein the means for dynamically changing changes the center frequencies in less than 10 milliseconds.

8. In a hybrid spread spectrum system including an indoor unit and an outdoor unit for wirelessly transmitting and receiving wideband digital data, a method is provided for transmitting power, control and RF signals between the indoor and outdoor units, the method comprising the steps of:

coupling a single coaxial cable between the indoor unit and the outdoor unit; and

transmitting the control, power and RF signals between the indoor unit and the outdoor unit over the single coaxial cable.