Methods of controlling communication parameters of wireless systems

A method of controlling a communication parameter of a channel for transmitting data between a transmit unit having a number M of transmit antennas and a receive unit having a number N of receive antennas, said method comprising:

• a) providing proposed mapping schemes for converting said data into symbols and assigning said data to transmit signals TSp, where p=1 . . . M, for transmission from said M transmit antennas;
• b) obtaining a measurement of said channel at said receiver;
• c) using said measurement to compute for each of said proposed mapping schemes a probability of error P(e) in said symbols when received;
• and
• d) selecting an applied mapping scheme from said proposed mapping schemes based on said probability of error P(e), thereby controlling said communication parameter.

A communication system with a controlled communication parameter of a channel for transmitting data between a transmit unit having a number M of transmit antennas and a receive unit having a number N of receive antennas, said transmit unit having a mapping circuit comprising:

• a) a conversion unit for converting said data into symbols;
• b) an assigning unit for assigning said data to transmit signals TSp, where p=1 . . . M, for transmission from said M transmit antennas, said converting and said assigning being in accordance with proposed mapping schemes;
• said receive unit comprising:
• a) a channel estimator for obtaining a measurement of said channel;
• b) a computing block for computing for each of said proposed mapping schemes a minimum Euclidean distance dmin,rx of said symbols when received;
• and
• c) a selection block for selecting an applied mapping scheme from said proposed mapping schemes based on said minimum Euclidean distance dmin,rx, thereby controlling said communication parameter.

A communication system with a controlled communication parameter of a channel for transmitting data between a transmit unit having a number M of transmit antennas and a receive unit having a number N of receive antennas, said transmit unit having a mapping circuit comprising:

• a) a conversion unit for converting said data into symbols;
• b) an assigning unit for assigning said data to transmit signals TSp, where p=1 . . . M, for transmission from said M transmit antennas, said converting and said assigning being in accordance with proposed mapping schemes;
• said receive unit comprising:
• a) a channel estimator for obtaining a measurement of said channel;
• b) a computing block for computing for each of said proposed mapping schemes a probability of error P(e) of said symbols when received;
• and
• c) a selection block for selecting an applied mapping scheme from said proposed mapping schemes based on said probability of error P(e), thereby controlling said communication parameter.