High data rate CDMA wireless communication system
AssigneeQUALCOMM Incorporated
InventorJoseph P. Odenwalder
Life of this patent
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Abstract
A novel and improved method and apparatus for high rate CDMA wireless communication is described. A set of individually gain adjusted subscriber channels are formed via the use of a set of orthogonal subchannel codes. The set of sub-channel codes are comprised of four Walsh codes. The pilot data and control data are combined onto one channel. The remaining two transmit channels are used for transmitting non-specified digital data including user data or signaling data, or both.
Claims25
A method for generating modulated data for transmission from a first subscriber unit in a set of subscriber units to a base station in communication with the set of subscriber units comprising the steps of:
- generating a pilot signal;
- combining said pilot signal with a control signal to produce a first channel data;
- spreading a first data with a first code, said first code being orthogonal to said pilot signal, to produce second channel data;
- modulating said first channel data and said second channel data in accordance with a single channel modulation format.
A remote station comprising:
- multiplexer for receiving pilot symbols and control symbols and for multiplexing said pilot symbols and control symbols in accordance with a predetermined multiplexing format to provide a multiplexed pilot and control symbol signal;
- a first channel modulator for receiving information data and for modulating said information data in accordance with a first spreading code to provide a fundamental channel signal;
- and
- complex spreader for receiving said multiplexed pilot and control symbol signal and said fundamental channel signal and for spreading said multiplexed pilot and control symbol signal and said fundamental channel signal in accordance with at least two pseudonoise sequences.
A method for demodulating data at a base station, comprising the steps of:
- despreading received signal in accordance with at least two pseudonoise sequences to provide a pseudonoise despread signal;
- demultiplexing pilot symbols from said pseudonoise despread signal;
- and
- demodulating a first channel from said pseudonoise despread signal in accordance with said pilot symbols and a first despreading code.
A base station comprising:
- complex pseudonoise despreader for despreading received signal in accordance with at least two pseudonoise sequences to provide a pseudonoise despread signal;
- demultiplexer for selectively removing pilot symbols from said pseudonoise despread signal;
- a first channel demodulator for receiving said pseudonoise despread signal and for demodulating said pseudonoise despread signal in accordance with said pilot symbols and a first despreading code.
Dependencies are inferred from the claim text.