Method and apparatus to balance maximum information rate with quality of service in a MIMO system

A wireless multiple input/multiple output MIMO communication system, comprising a transmitter having a plurality of antennas and a transmitter controller coupled to the antennas for generating eigen sub-channels towards a receiver, said transmitter controller comprising a data processor responsive to execution of a stored program, for N symbols of a frame of information to be transmitted through a plurality of eigen sub-channels, to allocate N1 symbols to a stronger eigen sub-channel and N2 symbols to a weaker eigen sub-channel, where N1>N2, and wherein N, N1 and N2 indicate, respectively, numbers of symbols, to determine a probability of reception error when transmitting the N2 symbols through the weaker eigen sub-channel for an auxiliary signal-to-noise ratio, to solve for a quality of service QoS of the weaker eigen sub-channel and, responsive to a case where the QoS is less than a desired QoS, to decrease the value of N and to repeat allocating symbols, determining the probability of reception error and solving for the QoS.

A wireless multiple input/multiple output MIMO transmitter comprising a plurality of antennas and a transmitter controller coupled to the antennas for generating eigen sub-channels towards a receiver, said transmitter controller comprising a data processor responsive to execution of a stored program, for N symbols of a frame of information to be transmitted through a plurality of eigen sub-channels, to allocate N1 symbols to a stronger eigen sub-channel and N2 symbols to a weaker eigen sub-channel, where N1>N2, and wherein N, N1 and N2 indicate, respectively, numbers of symbols, to determine a probability of reception error when transmitting the N2 symbols through the weaker eigen sub-channel for an auxiliary signal-to-noise ratio, to solve for a quality of service QoS of the weaker eigen sub-channel and, responsive to a case where the QoS is less than a desired QoS, to decrease the value of N and to repeat allocating symbols, determining the probability of reception error and solving for the QoS, where

• during allocating, determining and solving said transmitter controller jointly adapts at least a constellation size and a number of spreading codes in an asymmetric allocation of spreading codes.