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A coded VSB-QPSK transmission scheme for digital satellitecommunications in co-channel interference environments

机译:在同频道干扰环境下用于数字卫星通信的编码VSB-QPSK传输方案

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摘要

A coded VSB (vestigial side band)-QPSK (quadrature phase-shift keying) transmission scheme is proposed to realize interference-resistant digital satellite communication system. It uses an interference suppression filter to suppress the interference power in the receiving side. The suppressed power can be assigned to the transmission signals in advance by also using a same characteristic band limitation filter in the transmission side. Moreover, high coding-gain forward error correction (FEC) is employed to improve the degradation due to I and Q channel crosstalk by interference suppression. When a D/U (desired and undesired signal power ratio) equals 3 dB and a Δf/f N (Δf: interference frequency offset, fN: one-half the Nyquist bandwidth) equals 1.05, the proposed scheme achieves an Eb/No improvement of 7.3 dB in a CCI (co-channel interference) environment
机译:为了实现抗干扰的数字卫星通信系统,提出了一种编码的VSB(副边带)-QPSK(正交相移键控)传输方案。它使用干扰抑制滤波器来抑制接收侧的干扰功率。通过在发送侧也使用相同的特征频带限制滤波器,可以预先将抑制的功率分配给发送信号。此外,采用高编码增益前向纠错(FEC)来改善由于干扰抑制而导致的I和Q信道串扰引起的劣化。当D / U(期望和不期望的信号功率比)等于3 dB并且Δf/ f N(Δf:干扰频率偏移,fN:奈奎斯特带宽的一半)等于1.05时,所提方案实现了Eb / No改善CCI(同频道干扰)环境下的7.3 dB

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