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基于Chirp扩频技术的超宽带(UWB)通信系统目前有两种调制方式:二进制正交键控(Binary Orthogonal Keying,BOK)调制和直接调制(Direct Modulation,DM),基于BOK调制的超宽带系统实现简单,可靠性高,但信息传输速率不高。本文采用了一种改进的BOK调制方法———四进制双正交键控(Quaternary Bi-Orthogonal Keying,QBOK),解决了BOK调制时一个Chirp波形只携带1比特信息而导致信息传输速率较慢的问题。本文论证了QBOK算法的可行性,并且在现场可编程门阵列(FPGA)硬件平台上实现了基于QBOK调制的ChirpUWB系统,实验结果表明,相比BOK来说,基于QBOK调制的ChirpUWB系统可以使信息传输速率提高一倍。
There are currently two modulation schemes for UWB communication systems based on Chirp spreading: Binary Orthogonal Keying (BOK) and Direct Modulation (DM), BOK-based UWB systems Achieve simple, high reliability, but the information transfer rate is not high. In this paper, an improved BOK modulation method, Quaternary Bi-Orthogonal Keying (QBOK), is used to solve the problem that when a Chirp waveform carries only 1-bit information during BOK modulation, the information transmission rate Slow question. This paper demonstrates the feasibility of the QBOK algorithm and implements a QBOK-based ChirpUWB system on a field programmable gate array (FPGA) hardware platform. The experimental results show that the QBOK-based ChirpUWB system can make the information The transmission rate is doubled.