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US 2003/0076872 A1Published application
Method and apparatus for enhancing data rates in spread spectrum communication systems
AssigneeInfineon Technologies AG
InventorsLouay M. A. Jalloul, Abhijit G. Shanbhag
Life of this patent
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Abstract
We have devised both a high data transmitter and a high data receiver that uses both Walsh codes and quasi orthogonal functions in spreading and despreading transmitted and received signals.
Claims20
A high data rate spread spectrum transmitter comprising:
- an encoder for encoding an input bit stream of R bits/second to produce an output bit stream of RS bits/second;
- an interleaver for scrambling the bits of the output bit stream of the encoder to produce an interleaved bit stream;
- a M-ary modulator for modulating the interleaved bit stream to produce a modulated bit stream;
- a serial-to-parallel converter to convert the modulated bit stream to a plurality of parallel bit streams;
- a generator for generating a set of quasi orthogonal functions of a set of Walsh codes;
- an array of multipliers, each multiplier receiving one of the parallel bit streams and multiplying it with a Walsh code or a quasi orthogonal function of a Walsh code to produce a spread spectrum bit stream;
- and
- a combiner for combining the spread spectrum bit streams from the array of multipliers.
5 more elements
A high data rate spread spectrum receiver comprising:
- an RF front end for receiving a signal;
- a generator for generating a set of quasi orthogonal functions of a set of Walsh codes;
- a despreader for despreading the received signal using a Walsh code or a quasi orthogonal function to form a despread signal;
- a multi-user detection block for subtracting interference in the despread signal resulting from use of the quasi orthogonal functions to form a corrected signal;
- and
- a combiner for combining a plurality of corrected signals.
3 more elements
Communication apparatus for communicating over a transmission channel comprising:
- a high data rate spread spectrum transmitter comprising:
- an encoder for encoding an input bit stream of R bits/second to produce an output bit stream of RS bits/second;
- an interleaver for scrambling the bits of the output bit stream of the encoder to produce an interleaved bit stream;
- a M-ary modulator for modulating the interleaved bit stream to produce a modulated bit stream;
- a serial-to-parallel converter to convert the modulated bit stream to a plurality of parallel bit streams;
- a generator for generating a set of quasi orthogonal functions of a set of Walsh codes;
- an array of multipliers, each multiplier receiving one of the parallel bit streams and multiplying it with a Walsh code or a quasi orthogonal function of a Walsh code to produce a spread spectrum bit stream;
- and
- a combiner for combining the spread spectrum bit streams from the array of multipliers to form a signal to be transmitted over the transmission channel;
- and a high data rate spread spectrum receiver comprising:
- an RF front end for receiving a signal from the transmission channel;
- a generator for generating a set of quasi orthogonal functions of a set of Walsh codes;
- a despreader for despreading the received signal using a Walsh code or a quasi orthogonal function to form a despread signal;
- a multi-user detection block for subtracting interference in the despread signal resulting from use of the quasi orthogonal functions to form a corrected signal;
- and
- a combiner for combining a plurality of corrected signals.
13 more elements
Dependencies are inferred from the claim text.