Communication system using OFDM for one direction and DSSS for another direction
First Claim
Patent Images
1. A method comprising:
- transmitting orthogonal frequency division multiplexing (OFDM) signals, the OFDM signals comprising OFDM modulation according to an OFDM only modulation technique;
receiving a direct-sequence spread spectrum (DSSS) signal generated by a subscriber, the DSSS signal comprising DSSS modulation according to a DSSS only modulation technique; and
enabling use of a first portion of OFDM subcarriers of said OFDM signals by the subscriber using said received DSSS signal.
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Abstract
A method and apparatus for wireless communication are described. In one embodiment, a method for communicating with a subscriber comprises transmitting orthogonal frequency domain multiplexing (OFDM) signals to the subscriber, and receiving direct-sequence spread spectrum (DSSS) signals from the subscriber.
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Citations
17 Claims
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1. A method comprising:
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transmitting orthogonal frequency division multiplexing (OFDM) signals, the OFDM signals comprising OFDM modulation according to an OFDM only modulation technique; receiving a direct-sequence spread spectrum (DSSS) signal generated by a subscriber, the DSSS signal comprising DSSS modulation according to a DSSS only modulation technique; and enabling use of a first portion of OFDM subcarriers of said OFDM signals by the subscriber using said received DSSS signal. - View Dependent Claims (2, 3, 4, 5)
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6. A method comprising:
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transmitting orthogonal frequency division multiplexing (OFDM) signals, the OFDM signals comprising OFDM modulation according to an OFDM only modulation technique; establishing a bi-directional direct-sequence spread spectrum (DSSS) communication link with a subscriber, DSSS signals of the DSSS communication link comprising DSSS modulation according to a DSSS only modulation technique; and enabling use of at least a portion of said OFDM signals by the subscriber using communication via said bi-directional DSSS communication link, wherein said use of said at least a portion of said OFDM signals provides a uni-directional OFDM link. - View Dependent Claims (7, 8, 9)
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10. A method comprising:
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establishing a bi-directional direct-sequence spread spectrum (DSSS) communication link with a subscriber, wherein DSSS signals of the DSSS communication link comprise DSSS modulation according to a DSSS only modulation technique; and establishing a uni-directional orthogonal frequency division multiplexing (OFDM) link with the subscriber, wherein OFDM signals of the OFDM communication link comprise OFDM modulation according to an OFDM only modulation technique, and wherein said bi-directional DSSS communication link and said uni-directional communication link are part of a same communication service. - View Dependent Claims (11, 12)
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13. A method comprising:
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establishing a bi-directional DSSS communication link between a subscriber and a base station, wherein DSSS signals of the DSSS communication link comprise DSSS modulation according to a DSSS only modulation technique; using said bi-directional DSSS communication link to communicate information for use in establishing an orthogonal frequency division multiplexing (OFDM) communication link for use by the subscriber; and establishing a uni-directional OFDM communication link with the subscriber using said DSSS communication link, wherein OFDM signals of the OFDM communication link comprise OFDM modulation according to an OFDM only modulation technique. - View Dependent Claims (14, 15)
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16. A system comprising:
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a subscriber having a DSSS transmitter, a DSSS receiver; and an OFDM receiver; a communication network communicably coupled with the subscriber, the communication network having a DSSS receiver, a DSSS transmitter; and an OFDM transmitter, and a communication service protocol operable to establish a bi-directional communication link for use by the subscriber using said DSSS transmitters and DSSS receivers and a uni-directional communication link for use by the subscriber using said OFDM receiver and OFDM transmitter, wherein DSSS signals of the DSSS communication link comprise DSSS modulation according to a DSSS only modulation technique, and wherein OFDM signals of the OFDM communication link comprise OFDM modulation according to an OFDM only modulation technique.
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17. A method comprising:
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transmitting orthogonal frequency division multiplexing (OFDM) signals; receiving a plurality of direct-sequence spread spectrum (DSSS) signals generated by a plurality of subscribers, wherein the plurality of DSSS signals are transmitted asynchronously; and enabling use of a first portion of OFDM subcarriers of said OFDM signals by the subscribers using a respective DSSS signal of said received DSSS signals.
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Specification