Orthogonalized spatial multiplexing for wireless communication

A transmitter (1, 5) for processing information data (110) for providing modulated signals (1201, . . . , 120n, 2201, . . . , 220n) for transmission via a plurality of transmit antennas (221, . . . , 22n), wherein the transmitter (1, 5) comprises:

• means (12, 13), responsive to the information data (110), for providing encoded data (112, 213);
• means (18) for spreading the encoded data with a spreading code (1800) for providing a first spreaded data stream (1181, 2181, 2182), and for spreading the encoded data with at least one delayed version (1801, . . . , 180n−1) of the spreading code (1800) for providing at least one second spreaded data stream (1182, 2183, 2184);
• and
• means (20) for modulating the first and second spreaded data streams for providing the modulated signals, characterized by
• means (16, 17), responsive to the encoded data (112, 213), for separating the encoded data into data sub-streams (1161, . . . , 116n, 2171, . . . , 217n) prior to the spreading of the encoded data by the spreading means (18), the data sub-streams including at least a first group of encoded data (1161, 2171, 2172) and a second group of encoded data (1162, 2173, 2174) such that the first spreaded data stream (1181, 2181, 2182) is indicative of the first group of encoded data (1161, 2171, 2172) and said at least one second spreaded data stream (1182, 2183, 2184) is indicative of the second group of encoded data (1162, 2173, 2174).

A wireless communications system (1, 3) (5, 7) comprising a transmitter (1, 5) and a receiver (3, 7), the transmitter (1, 5) having a plurality of transmit antennas (221, . . . , 22n) for transmitting modulated signals (1201, . . . , 120n, 2201, . . . , 220n) indicative of information data (110) and the receiver (3, 7) having a plurality of receive antennas antennas (301, . . . 30m) for receiving modulated signals, wherein the transmitter (1, 5) comprises:

• means (12, 13), responsive to the information data (110), for providing encoded data (112, 213);
• means (18) for spreading the encoded data with a spreading code (1800) for providing a first spreaded data stream (1181, 2181, 2182), and for spreading the encoded data with at least one delayed version (1801, . . . , 180n−1) of the spreading code (1800) for providing at least one second spreaded data stream (1182, 2183, 2184);
• and
• means (20) for modulating the first and second spreaded data streams for providing the modulated signals, characterized by
• means (16, 17), responsive to the encoded data (112, 213), for separating the encoded data into data sub-streams (1161, . . . . 116n, 2171, . . . 217n) prior to the spreading of the encoded data by the spreading means (18), the data sub-streams including at least a first group of encoded data (1161, 2171, 2172) and a second group of encoded data (1162, 2173, 2174) such that the first spreaded data stream (1181, 2181, 2182) is indicative of the first group of encoded data (1161, 2171, 2172) and said at least one second spreaded data stream (1182, 2183, 2184) is indicative of the second group of encoded data (1162, 2173, 2174).