Remote unit multichannel CDMA subtractive interference canceller
AssigneeInterDigital Technologies Corporation
InventorsDonald L. Schilling, John Kowalski
Life of this patent
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Abstract
Apparatus employed by a remote unit wherein a plurality of channels are received as a received signal. Each channel is associated with a code. For each of the plurality of channels, others of the plurality of channels are subtracted from the received signal and a result of that subtracting is despread as data for that channel.
Claims2
A remote unit receiver for recovering data transmitted over a plurality of channels employing a wireless code division multiple access communication technique, comprising:
- a unit for receiving the plurality of channels as a received signal, each channel associated with a code;
- for each of the plurality of channels, a subtractor for subtracting others of the plurality of channels from the received signal and despreading a result of that subtraction as data for that channel;
- for each channel, a first mixer operatively coupled to the input for despreading the received signal with that channel code;
- and
- for each channel, a second mixer for respreading that channel despread signal with a respective channel code;
- wherein the respreading channel code is aligned to a timing of the despread received signal;
- and
- wherein for each channel, the subtractor subtracts from the received signal the respread channels other than that channel.
A remote unit receiver for recovering data transmitted over a plurality of channels employing a wireless code division multiple access communication technique, comprising:
- a unit for receiving the plurality of channels as a received signal, each channel associated with a code;
- for each of the plurality of channels, a subtractor for subtracting others of the plurality of channels from the received signal and despreading a result of that subtraction as data for that channel;
- for each channel, a matched filter operatively coupled to the receiving unit for despreading the received signal with that channel code;
- and
- for each channel, a mixer for respreading that channel despread signal with a respective channel code;
- wherein the respreading channel code is aligned to a timing of the despread received signal;
- and
- wherein for each channel, the subtractor subtracts from the received signal the respread channels other than that channel.
Dependencies are inferred from the claim text.