Apparatus for providing increased data rates within existing modulation systems
AssigneeEricsson Inc.
InventorStephen R. Wynn
Life of this patent
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Abstract
A method for increasing data rates within a modulated signal is disclosed. Initially, a first and second bit streams are interleaved together to form an interleaved output bit stream. The interleaved output bit stream is modulated in a manner such that upon demodulation of the interleaved output bit stream according to an FSK modulation scheme only the first bit stream is recovered, and upon demodulation of the interleaved output bit stream according to a second modulation scheme, both the first and second bit streams are recovered.
Claims11
A method for generating a modulated RF signal comprising the steps of:
- interleaving a first bit stream with a second bit stream to generate a single interleaved bit stream;
- encoding the single interleaved bit stream using a .pi./4-DQPSK encoding scheme;
- modulating the encoded single interleaved bit stream using a .pi./4-DQPSK modulation scheme to yield a modulated, encoded single interleaved bit stream;
- and
- wherein upon demodulating and decoding the modulated, encoded single interleaved bit stream according to a first scheme yields only the first bit stream and demodulating and decoding the modulated, encoded single interleaved bit stream according to a second scheme yields both the first and second bit streams.
An apparatus for increasing data rates within a modulated RF signal, comprising:
- an interleaver for combining a first bit stream with a second bit stream;
- and
- an encoder for encoding a single combined bit stream from the means for combining using a .pi./4-DQPSK encoding scheme;
- a modulator for modulating a single encoded bit stream from the encoder using a .pi./4 DQPSK-modulation scheme to yield a modulated, encoded single interleaved bit stream, and
- wherein upon demodulating and decoding the modulated, encoded single interleaved bit stream according to a first scheme yields only the first bit stream and demodulating and decoding the modulated, encoded single interleaved bit stream according to a second scheme yields both the first and second bit streams.
A method for generating a modulated RF signal comprising the steps of:
- interleaving a first bit stream with a second bit stream to generate a single interleaved bit stream;
- encoding the single interleaved bit stream using a m.pi./2-DQPSK encoding scheme, where m=an integer value;
- modulating the encoded single interleaved bit stream using a m.pi./2-DQPSK modulation scheme to yield a modulated encoded single interleaved bit stream;
- and
- wherein upon demodulating and decoding the modulated, encoded single interleaved bit stream according to a first scheme yields only the first bit stream and demodulating and decoding the modulated encoded single interleaved bit stream according to a second scheme yields both the first and second bit streams.
An apparatus for increasing data rates within a modulated RF signal, comprising:
- an interleaver for combining a first bit stream with a second bit stream;
- an encoder for encoding a single combined bit stream from the interleaver using a m.pi./2-DQPSK encoding scheme, where m=an integer value;
- a modulator for modulating an encoded single interleaved bit stream from the encoder using a .pi./4-DQPSK modulation scheme to yield a modulated encoded single interleaved bit stream;
- and
- wherein upon demodulating and decoding the modulated encoded single interleaved bit stream according to a first scheme yields only the first bit stream and demodulating and decoding the modulated, encoded single interleaved bit stream according to a second scheme yields both the first and second bit streams.
Dependencies are inferred from the claim text.