Low complexity indoor wireless data links using chirp spread spectrum
Low complexity indoor wireless data links using chirp spread spectrum
复制标题
使用线性调频扩频的低复杂度室内无线数据链路
DOI：
10.11575/prism/16904
复制
发表时间：
2004
期刊：
影响因子：
--
通讯作者：
J. Pinkney
中科院分区：
文献类型：
--
作者：
A. Sesay;J. Pinkney
本文提出了在室内无线环境中使用Chirp扩频（CSS）调制来传输高速（10mb / s）数据。CSS利用啁啾信号的特性来对抗多径衰落的影响。CSS相对于其他频谱扩展技术的主要优势是它的纯模拟实现。
This dissertation proposes the use of Chirp Spread Spectrum (CSS) modulation for the transfer of high-speed (>10 megabits per second) data in the indoor wireless environment. CSS utilizes the properties of chirp signals to combat the effects of multipath fading. The major advantage CSS has over other spectrum spreading techniques is its analog-only implementation.
Two main methods for deploying CSS are described: Binary Orthogonal Keying (BOK), in which chirp signals with different characteristics represent different data symbols, and Direct Modulation (DM), where data is modulated using a conventional non-coherent modulation scheme, and then has its bandwidth spread by the chirp signal.
Performance equations for the Gaussian channel are derived for both systems. Several other key system design parameters are identified and explored, including chirp windowing, occupied bandwidth, and quasi-RAKE filter configuration. Computer simulations and prototype measurements show close agreement with the developed theory. Raw bit error rates less than 10−5 at 20 megabits per second are achieved, with a bandwidth of 200 MHz in non line of sight wireless channels over 10 m with less than 2 milli-Watts of transmit power.
Techniques for designing SAW chirp filters with both linear and nonlinear time-frequency responses are described, and measurements of a prototype SAW device are presented. Novel methods for enhancing the throughput of a binary CSS system are presented which increase the number of bits per symbol of the modulation CSS signal. Computer simulations show that data rates of 50 megabits per second are achievable for a single channel system using this method.