中文摘要：

针对利用两状态网格图对递归部分响应成形偏移正交相移键控SOQPSK-TG信号进行解调时，网格图状态变量与累积相位不存在一一对应关系的问题，研究了解决此问题的判决反馈解调算法。该算法根据两状态网格图，在网格状态转移过程中，通过判决反馈，得到状态变量对应的累积相位。仿真结果表明，在信噪比大于0dB时，SOQPSK-TG信号两状态判决反馈解调算法可以获得接近四状态解调的误比特性能。

英文摘要：

To solve the problem of one-to-one correspondence relationship not existing between state variable and cumulative phase in two-state trellis of shaped-offset quadrature phase-shift keying（SOQPSK-TG）, a decision feedback demodulation algorithm for recursive SOQPSK-TG is researched. According to a two-state trellis, cumulative phase corresponding to the state variable is obtained by decision feedback in state transition. Simulation results show that at Ed/N0≥ 0 dB, the decision feedback demodulation algorithm can achieve a BER performance which is very close to four-state demodulation algorithm performance.