Hybrid wireless communication system
First Claim
1. A method of wideband communication between a base station and a plurality of remote terminals within each cell of a multi-cell network, comprising:
- 1) at each base station, processing a base input data signal for broadcast to remote terminals in the same cell by;
demultiplexing the base input data signal into a plurality of base channels;
modulating a portion of the base input data signal in each base channel;
time division multiplexing each modulated base channel within one or more data time periods to form a base output data signal;
spreading the base output data signal with a pseudo-random noise signal to form a broadcast signal;
broadcasting the broadcast signal to be received by the plurality of remote terminals within the same cell; and
, 2) at each remote terminal, processing a terminal data signal for transmission to the base station in the same cell by;
demultiplexing the terminal data signal into one or more terminal channels;
modulating a portion of the terminal input data signal in each terminal channel;
spreading each modulated terminal channel with an orthogonal code to form an orthogonal signal;
summing a predetermined number of the orthogonal signals to form a terminal signal; and
scheduling the terminal signal for transmission by the remote terminal to be received by the base station in the same cell synchronously with terminal signals from other remote terminals in the same cell.
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Accused Products
Abstract
A wireless network of multiple base stations, each communicating with multiple remote terminals, exhibiting simpler design and enhanced inter-user and inter-base interference rejection. The downlink from a base to the multiple remote terminals employs a combination of time division multiplexing (TDM) and time division multiple access (TDMA) to multiplex signals carrying data to the remote terminals, and spreads the multiplexed signal with a pseudo-random noise (PN) sequence. The uplink from each remote terminal to the respective base uses orthogonal code division multiple access (O-CDMA) coding to multiplex a variable number of channels for each remote terminal. Short O-code sequences are derived based on pseudo-random maximal length sequences and quadratic residue sequences to introduce sufficient randomness into the multiple access coding to reject inter-base interference without the use of PN signal spectrum spreading.
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Citations
18 Claims
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1. A method of wideband communication between a base station and a plurality of remote terminals within each cell of a multi-cell network, comprising:
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1) at each base station, processing a base input data signal for broadcast to remote terminals in the same cell by;
demultiplexing the base input data signal into a plurality of base channels;
modulating a portion of the base input data signal in each base channel;
time division multiplexing each modulated base channel within one or more data time periods to form a base output data signal;
spreading the base output data signal with a pseudo-random noise signal to form a broadcast signal;
broadcasting the broadcast signal to be received by the plurality of remote terminals within the same cell; and
,2) at each remote terminal, processing a terminal data signal for transmission to the base station in the same cell by;
demultiplexing the terminal data signal into one or more terminal channels;
modulating a portion of the terminal input data signal in each terminal channel;
spreading each modulated terminal channel with an orthogonal code to form an orthogonal signal;
summing a predetermined number of the orthogonal signals to form a terminal signal; and
scheduling the terminal signal for transmission by the remote terminal to be received by the base station in the same cell synchronously with terminal signals from other remote terminals in the same cell. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A wideband communication system for communicating between a base station and a plurality of remote terminals within each cell of a multi-cell network, comprising:
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1) at each base station, logic for processing a base input data signal for broadcast to remote terminals in the same cell comprising;
a base demultiplexer for demultiplexing the base input data signal into a plurality of base channels;
a plurality of base modulators for modulating a portion of the base input data signal in each base channel;
a base multiplexer for time division multiplexing each modulated base channel within one or more data time periods to form a base output data signal;
a base multiplier for spreading the base output data signal with a pseudo-random noise signal to form a broadcast signal;
a RF system for broadcasting the broadcast signal to be received by the plurality of remote terminals within the same cell; and
,2) at each remote terminal, logic for processing a terminal data signal for transmission to the base station in the same cell comprising;
a terminal demultiplexer for demultiplexing the terminal data signal into one or more terminal channels;
a terminal modulator in each terminal channel for modulating a portion of the terminal input data signal in each respective terminal channel;
a terminal multiplier for spreading each modulated terminal channel with an orthogonal code to form an orthogonal signal;
a terminal adder for summing a predetermined number of the orthogonal signals to form a terminal signal; and
logic for scheduling the terminal signal for transmission by the remote terminal to be received by the base station in the same cell synchronously with terminal signals from other remote terminals in the same cell. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification