基于CORDIC算法的BLE4.0发射机数字基带的设计与实现
发布时间:2018-07-05 04:41
本文选题:蓝牙4.0 + 数字基带 ; 参考:《东南大学》2016年硕士论文
【摘要】:蓝牙4.0拥有低功耗、低成本等特点,故其在短距离无线通信领域中得到广泛的应用。随着社会的不断进步,低功耗蓝牙数字基带也变得越来越重要,因此,设计一种复杂度低和资源消耗少的低功耗蓝牙发射机数字基带电路具有重要意义。本文设计了一种实现蓝牙4.0发射机数字基带电路的方案。该方案针对CORDIC算法中迭代次数过多的问题,在免缩放因子CORDIC算法的基础上使用了区间折叠技术,通过区域映射,可以真正的避免对缩放因子的计算,同时又可以快速的计算输入角度,以达到减少迭代次数的目的,从而减少资源的消耗。另外,为了简化运算过程,在这种方案实施之前,采用了区域映射,将不同区域的角度映射到[0,pi/4]。完成各模块的设计后,在本文的最后,搭建了FPGA平台对发射机数字基带电路系统进行了仿真验证。FPGA验证的结果表明:在8MHz的系统时钟下,所设计的发射机数字基带电路能够实现码率为1Mbps的信号,发射机数字基带电路中高斯频移键控(GFSK)调制信号的均方根误差约为4.305%,改进后的CORDIC模块与传统的实现方式相比,逻辑资源消耗减少了16.5%。本文设计的蓝牙4.0发射机数字基带电路在性能上能够很好的符合系统指标要求,为低功耗蓝牙发射机数字基带电路的设计提供了参考,具有一定的应用前景和实用价值。
[Abstract]:Bluetooth 4.0 has the characteristics of low power consumption and low cost, so it is widely used in short range wireless communication field. With the development of society, low-power Bluetooth digital baseband becomes more and more important. Therefore, it is important to design a low-power Bluetooth transmitter digital baseband circuit with low complexity and low resource consumption. In this paper, a scheme of realizing the digital baseband circuit of Bluetooth 4.0 transmitter is designed. Aiming at the problem of too many iterations in Cordic algorithm, this scheme uses interval folding technology on the basis of non-scaling factor Cordic algorithm. By means of region mapping, the calculation of scaling factor can be avoided. At the same time, the input angle can be calculated quickly to reduce the number of iterations and reduce the consumption of resources. In addition, in order to simplify the operation process, the region mapping is adopted before the implementation of this scheme, and the angle of different regions is mapped to [0 pip / 4]. At the end of this paper, the FPGA platform is built to verify the transmitter digital baseband circuit system. The results of FPGA verification show that: under the system clock of 8 MHz, The designed transmitter digital baseband circuit can realize the signal with code rate of 1Mbps. The root mean square error of the Gao Si frequency shift keying modulation signal in the transmitter digital baseband circuit is about 4.305. The improved Cordic module is compared with the traditional implementation mode. Logical resource consumption was reduced by 16.5. The digital baseband circuit of Bluetooth transmitter 4.0 designed in this paper can meet the requirements of the system well in performance, which provides a reference for the design of digital baseband circuit of low power Bluetooth transmitter, and has a certain application prospect and practical value.
【学位授予单位】:东南大学
【学位级别】:硕士
【学位授予年份】:2016
【分类号】:TN83
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