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设计了一种基于正交频分复用技术,用于短波信道的调制解调器。该调制解调器以DSP为数字信号处理核心,可实时地进行OFDM调制和解调,并利用信道估计、符号同步等多种参数估计算法,提高该系统的误码率性能。实验测试表明该调制解调器可在带宽为3 kHz的短波信道上实现1 200 bit/s、2 400 bit/s、3 600 bit/s和4 800 bit/s的有效数据传输。
A modem based on Orthogonal Frequency Division Multiplexing technology is designed for short-wave channel. The modem takes DSP as the core of digital signal processing, realizes OFDM modulation and demodulation in real time, and utilizes multiple parameter estimation algorithms such as channel estimation and symbol synchronization to improve the bit error rate performance of the system. Experimental tests show that this modem can effectively transmit data of 1 200 bit / s, 2 400 bit / s, 3 600 bit / s and 4 800 bit / s on a short-wave channel with a bandwidth of 3 kHz.