Multiple-antenna systems are a promising approach to increase the data rate of wireless communication systems. One efficient\r\npossibility is spatialmultiplexing of the transmitted symbols over several antennas.Many different MIMO detector algorithms exist\r\nfor this spatialmultiplexing. The major difference between differentMIMOdetectors is the resulting communications performance\r\nand implementation complexity, respectively. Particularly closed-loop MIMO systems have attained a lot of attention in the last\r\nyears. In a closed-loop system, reliability information is fed back from the channel decoder to the MIMO detector. In this paper, we\r\nderive a basic framework to compare different soft-input soft-output MIMO detectors in open- and closed-loop systems. Within\r\nthis framework, we analyze a depth-first sphere detector and a breadth-first fixed effort detector for different application scenarios\r\nand their effects on area and energy efficiency on the whole system.We present all system components under open- and closed-loop\r\nsystem aspects and determine the overall implementation cost for changing an open-loop system in a closed-loop system.
Loading....