Bit and Power Allocation Strategies in SVD-equalized Broadband MIMO Systems
نویسندگان
چکیده
Adaptive bit and power loading schemes in broadband Multiple-Input Multiple-Output (MIMO) systems are generally aiming to maximize the overall system throughput. However, in delay-critical applications such as voice or video streaming, a fixed data rate is crucial. Therefor in this contribution, bit and power allocation schemes in broadband MIMO systems for fixed rate applications are developed. The proposed schemes aim for optimizing the number of active MIMO layers and the number of bits per symbol in addition to an appropriate power assignment. The main goal is to minimize the overall bit-error rate (BER) for a given fixed data rate and limited transmit power. It turned out that it is not necessary to activate all MIMO layers in order to optimize the BER performance. Moreover, it can be seen from computer simulation results that multipath propagation is not a limiting factor in broadband MIMO systems.
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