| US 7,515,659 B2 | ||
| Decoding techniques for multi-antenna systems | ||
| Greet Arnout Awater, Utrecht (Netherlands); and D. J. Richard Van Nee, De Meern (Netherlands) | ||
| Assigned to Agere Systems Inc., Allentown, Pa. (US) | ||
| Filed on Oct. 27, 2006, as Appl. No. 11/588,986. | ||
| Application 11/588986 is a continuation of application No. 11/195184, filed on Aug. 02, 2005, granted, now 7,180,954. | ||
| Application 11/195184 is a continuation of application No. 09/848882, filed on May 04, 2001, granted, now 6,968,013. | ||
| Prior Publication US 2007/0064827 A1, Mar. 22, 2007 | ||
| Int. Cl. H04L 27/06 (2006.01); H04L 5/12 (2006.01) | ||
| U.S. Cl. 375—341 [375/262] | 20 Claims |
| 1. A wireless device for a wireless data communication system comprising the wireless device and a base station, wherein the
base station comprises a plurality of first groups, each first group comprising a receiver and at least one antenna connected
to the receiver, and a signal-processing unit comprising memory and a processor adapted to process signals received by the
first groups using a Maximum Likelihood Detection (MLD) method, and the wireless device comprising:
a plurality of second groups, wherein: each second group is adapted to transmit a wireless signal to at least one first group via a corresponding communication channel;
and each second group comprises a transmitter and at least one antenna connected to the transmitter;
the signal-processing unit is adapted to store, in the memory, information corresponding to one or more transfer functions,
each transfer function corresponding to transmission of a wireless signal from an antenna of the second groups to an antenna
of the first groups;
the transmitters and receivers are adapted to operate at essentially the same frequency or frequency band;
two or more of the communication channels are generated simultaneously;
each transmitter is adapted to modulate an information signal on a radio-frequency signal according to a Quadrature Amplitude
Modulation (QAM) method to transmit QAM symbols;
each receiver is adapted to demodulate information signals from a received radio-frequency signal according to the QAM method;
and for the MLD method, the signal-processing unit is adapted to:
(a) calculate a first vector length for each of a plurality of complex vectors corresponding to a constellation having a plurality
of combinations of possible data values; and
(b) select a subset of the combinations based on the first vector lengths calculated in step (a).
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