TD-HSPA+系统联合检测算法与矩阵求逆的定点实现.docVIP

  TD-HSPA+系统联合检测算法与矩阵求逆 的定点实现# 奥布克，李剑峰** 5 10 15 20 25 30 35 40 （北京邮电大学网络体系构建与融合北京市重点实验室， 北京 100876） 摘要：TD-HSPA+是 TD-SCDMA 的演进标准，通过引用了多种新技术，大大提高了高速数 据传输的性能和可靠性。联合检测作为物理层的关键技术，其性能会对系统的性能有较大影 响。本文论述了 TD-HSPA+的帧结构与基于块傅里叶变换的联合检测算法，阐述了块傅里叶 算法将大维度的矩阵求逆简化为多个小矩阵的求逆运算的方法。在大量的小矩阵求逆运算中 存在一些含有较小奇异值的矩阵会严重影响系统的精度与性能，本文通过一种交换行的矩阵 求逆算法设计与实现了联合检测模块。并且比较了在不同的码道下，定点与浮点仿真性能的 差异，结果说明基于此种稳定的矩阵求逆算法能够达到接近浮点的性能。 关键词：通信与信息系统；TD-HSPA+；联合检测；矩阵求逆 中图分类号：TN929.53 Fixed-point Implementation of Joint Detection and Matrix Inversion of TD-HSPA+ System AO Buke, LI Jianfeng (The Beijing Key Laboratory of Network System Architecture and Construction, BeijingBeijing University of Posts and Telecommunications, Beijing, 100876) Abstract: TD-HSPA+ is an evolution standard of TD-SCDMA, by incorporating various new techniques, can improve the performance of data transmission and reliability significantly. Joint detection as a key technology in physical layer of the system, has great influence on performance of the system. This paper addresses the frame structure and block-FFT-based joint detection algorithm, discusses the method that how a large dimension matrix can reduce to many small matrix in inverse operation. In large amount of executions of matrix operation, the nearly singular matrix can decrease the system performance largely. This paper introduces a stable matrix inverse algorithm to the design and implementation of joint detection algorithm. By comparing different cases of fix-pointed and float-pointed on the performance of joint detection, this paper proves that this stable matrix inverse algorithm based joint detection can achieve a performance close to the performance of float point system. Key words: Communication and Information System; TD-HSPA+; Joint detection; Matrix inversion 0 引言 TD-SCDMA 是我国提出基于 TDD 的自主通信标准[1]， TDD 系统不受频率的限制，频 率利用率高。由于可以分配上下行链路的时隙分配比例，能够不对称传输的业务，特别适用 于新一代移动互联网。 HSPA 技术是 3GPP 提出的 3G 系统的一种演进技术，能够提高现有 3G 技术的性能， 主要包括 HSDPA/HSUPA，也被称作 3.5G/B3G 技术。HSPA+是 HSPA 基础上的升级，在保 持大