求翻译：与传统的无线收发信机结构相比，UWB收发信机的结构相对简单，如图1所示。为对比分析其优点，把UWB接收机与实现短距离通信的蓝牙接收机进行比较。Bluetooth采用跳频技术把1MHz带宽的信号扩展到79MHz，发射信号的中心频率为2.45GHz，带宽为79MHz。在接收端，弱信号首先经过放大器放大后下变频到中频IF=120MHz，下变频使用外差技术，混频后会产生镜像信号，在低频端，解调并恢复信号。是什么意思？

Compared with the traditional structure of a wireless transceiver, uwb transceiver structure is relatively simple, shown in Figure 1. Comparative analysis of its merits, uwb receiver and the receiver of the Bluetooth short-distance communication. bluetooth using frequency hopping signal of 1MHz band

With the traditional wireless transceiver architecture UWB compared transceiver, the structure is relatively simple, as shown in Figure 1. In contrast, the analysis of their strengths UWB receiver to communicate over short distances with the Bluetooth receiver. With Bluetooth frequency hopping techn

Compared with the traditional structure of wireless transceiver, UWB transceiver structure is relatively simple, as shown in Figure 1. Comparison and analysis of its advantages, short-distance communication and realization of UWB receiver compares the Bluetooth receiver. Bluetooth signal 1MHz bandwi