Transmitter for a wireless communications system using multiple codes and multiple antennas
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United States of America Patent
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-
Oct 9, 2007
Grant Date -
May 1, 2003
app pub date -
Apr 5, 2002
filing date -
Apr 5, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
In a transmitter of a wireless communications system having M transmit antennas (10), each transmit antenna is supplied with a respective combined signal comprising a respective one of M groups each of N data sub-streams, orthogonally spread by N Walsh code sequences (W1 to WN). The N orthogonal code sequences used for each of the M groups comprise a respective one of M different combinations of N from N.sub.w orthogonal code sequences, where N.sub.w>N. M and N are integers greater than one. The combined signals can also include orthogonally spread pilot signals (WP) for channel estimation at a receiver. Orthogonality of the signals transmitted from the transmit antennas is increased, so that transmit signal power can be decreased and/or the receiver can have fewer than M receive antennas.
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