Design of Channel-Estimate-Dependent Space–Time Block Codes

Design of Channel-Estimate-Dependent Space–Time Block Codes So far, the assumption of no channel knowledge at the transmitter has generally been inherent in the design of space–time codes. This paper, on the other hand, assumes that quantized channel information obtained from a feedback link is available at the transmitter, and investigates how such channel information can be incorporated into the design of unstructured space–time block codes. Efficient codes are found by means of a gradient search over a continuous alphabet. Simulation results for a Rayleigh fading scenario using two and four transmit antennas and one receiver antenna show the benefits of the code designs.