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分析比较了现有典型定点截短算法的性能和优缺点,提出了一种联合考虑上溢出和下溢出的基于代价函数的自适应定点截短算法,其性能优于其他截短算法,接近于穷举法;时间复杂度大大低于穷举法,与其他截短算法相仿.该算法被用于开发基于叠加码的广播通信系统硬件平台中,其有效性在软件仿真和硬件平台上得到了验证.
This paper analyzes and compares the performance, advantages and disadvantages of the existing typical fixed-point truncation algorithms and proposes an adaptive fixed-point truncation algorithm based on cost function considering both overflow and underflow. The proposed algorithm performs better than other truncated algorithms, Exhaustive method.The time complexity is much lower than the exhaustive method, which is similar to other truncation algorithms.The algorithm is used to develop the hardware platform of the overlay-based broadcast communication system, the effectiveness of which is obtained in the software simulation and hardware platform verification.