Multi-band, multi-mode spread-spectrum communication system
First Claim
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1. A transmitter comprising:
- a mode controller for selecting between a first fixed mode and a second fixed mode,a spread-spectrum modulator, responsive to said first fixed mode of said mode controller, for generating a spread-spectrum signal, anda narrowband modulator, responsive to said second fixed mode of said mode controller, for generating a narrowband signal wherein one of said narrowband signal and said spread spectrum signal is transmitted in a cellular region, and the other of said narrowband signal and said spread spectrum signal is transmitted in a microcellular region.
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Abstract
A technique for spread-spectrum communication which uses more than one mode and more than one frequency band. Selectable modes include narrowband mode and spread-spectrum mode, or cellular mode and microcellular mode. Selectable frequency bands include both licensed and unlicensed frequency bands, particularly frequency bands including the 902-928 MHz, 1850-1990 MHz, and 2.4-2.4835 GHz frequency bands. Spread-spectrum communication channels are 10 MHz or less in width. The frequency band onto which spread-spectrum signals are encoded may be changed upon a change in environment or other control trigger, such as establishment or de-establishment of communication with a private access network.
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Citations
27 Claims
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1. A transmitter comprising:
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a mode controller for selecting between a first fixed mode and a second fixed mode, a spread-spectrum modulator, responsive to said first fixed mode of said mode controller, for generating a spread-spectrum signal, and a narrowband modulator, responsive to said second fixed mode of said mode controller, for generating a narrowband signal wherein one of said narrowband signal and said spread spectrum signal is transmitted in a cellular region, and the other of said narrowband signal and said spread spectrum signal is transmitted in a microcellular region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A receiver comprising:
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a mode controller for selecting between a first fixed mode and a second fixed mode, a spread-spectrum demodulator, responsive to said first fixed mode of said mode controller, for demodulating a received spread-spectrum signal, and a narrowband demodulator, responsive to said second fixed mode of said mode controller, for demodulating a received narrowband signal wherein one of said received spread-spectrum signal and said received narrowband signal is received in a cellular region and the other of said received narrowband signal and received spread-spectrum signal is received in a microcellular region. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A transmitter comprising a mode controller for selecting from among a plurality of modulators, at least one of said modulators being a narrowband modulator and at least one of said modulators being a spread-spectrum modulator, wherein the narrowband modulator operates within a cellular system and the spread spectrum modulator operates within a microcellular system.
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20. A transmitter comprising
a switch for selecting between two modes, means responsive to a first of said two modes for transmitting in a cellular region, means responsive to a second of said two modes for transmitting in a microcellular region, wherein said means for transmitting in a cellular region further comprises means for generating a narrowband signal and said means for transmitting in a microcellular region further comprises means for generating a spread-spectrum signal.
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21. A telephone comprising
a switch for selecting between a first mode and a second mode, and a transmitter for transmitting in a cellular region in response to selecting said first mode and for transmitting in a microcellular region in response to selecting said second mode, wherein said transmitter transmits a spread-spectrum signal in at least one of said first mode and said second mode and said transmitter transmits a narrowband signal in the other of said first mode and said second mode.
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25. A receiver comprising
a mode controller for selecting between narrowband modulation and spread-spectrum modulation, an adjustable bandpass filter, responsive to a narrowband modulation setting of said mode controller for passing a narrowband signal, and responsive to a spread-spectrum setting of said mode controller for passing a spread-spectrum signal, a spread-spectrum demodulator for demodulating said spread-spectrum signal, and a narrowband demodulator for demodulating said narrowband signal wherein one of said narrowband signal and said spread spectrum signal is received in a microcellular region and the other of said narrowband signal and said spread spectrum signal is received in a cellular region.
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26. A cordless telephone comprising
a mode controller for selecting between a first mode and a second mode, a transmitter, responsive to said first mode of said mode controller for generating a spread-spectrum signal, and responsive to said second mode of said mode controller for generating a narrowband signal, and a receiver, responsive to said first mode of said mode controller for receiving a spread-spectrum signal, and responsive to said second mode of said mode controller for receiving a narrowband signal wherein one of the spread spectrum signal and the narrowband signal is transmitted and received in a cellular region and the other of the spread spectrum and the narrowband signal is transmitted and received in a microcellular region.
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27. A method for communication comprising the steps of
selecting between a narrowband mode and a spread-spectrum mode, generating, in response to said narrowband mode, a narrowband signal, generating, in response to said spread-spectrum mode, a spread-spectrum signal, transmitting one of said narrowband signal and said spread-spectrum signal in a cellular region, and transmitting the other of said narrowband signal and said spread-spectrum signal in a microcellular region.
Specification