提出了一种基于低中频、适用于ISM2.4GHz频段ZigBee接收机的新型解调算法,满足IEEE802.15.4标准。作为数字相位解调,本算法采用相位差分、频率补偿和符号恢复,不用分别恢复出I路和Q路的码序列,而直接提取出相位斜率码,恢复出符号,从而简化了解调结构、降低了功耗和成本。通过与零中频过零检测算法的比较,本算法具有更低复杂度,更好的误符号率和误包率,完全满足IEEE802.15.4/ZigBeeTM标准的要求。 A new demodulation algorithm based on low IF and ZigBee receiver for ISM2.4GHz is proposed to meet the IEEE802.15.4 standard. As the digital phase demodulation, the algorithm uses phase difference, frequency compensation and symbol recovery without the need to separately recover the code sequences of I and Q, and directly extract the phase slope code and recover the sign, thus simplifying the demodulation structure and reducing Power consumption and cost. Compared with zero-IF zero-crossing detection algorithm, this algorithm has lower complexity, better error symbol rate and packet error rate, and fully meets the requirements of IEEE802.15.4 / ZigBeeTM standard.