| 摘要: |
| 受卫星信道热噪声、多普勒、畸变影响，传统八进制相位键控（8PSK）接收机性能不
佳，速率不高，较少应用于航天测控通信系统。针对这一问题，设计并实现了一种基于FPGA
的航天测控系统宽带8PSK解调高速数传接收机，采用Gardner算法实现时钟恢复，利用基于
最大似然估计的鉴相算法完成载波同步，并用分数间隔的并行恒模均衡算法提高接收性能。
该技术已应用于某接收系统并实现了600 Mb/s 8PSK信号解调，误码率在1×10-3
～1×10-8之间时，解调损失与理论值不超过2 dB。宽带8PSK解调高速数传接收
机可为我国二代中继系统提供支持。 |
| 关键词: 测控通信系统 高速数传接收机 8PSK解调 载波同步 定时恢
复 恒模均衡 TDRSS |
| DOI： |
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| 基金项目: |
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| Design of a high data rate receiver with wideband 8PSK demodulation |
| LIU Jing-yuan |
| () |
| Abstract: |
| Because of the thermal noise, large Doppler and intersymbol interference in a sa
tellite communication link, high data rate receiver(HDR) with 8Phase Shift
Keying(8PSK) demodulation is used in tracking and data relay satellite sys
tem(TDRSS). A wideband 8PSK demodulation technology is proposed. The technology
employs Gardner algorithm as timing synchronizer, Maximum Likelihood(ML) Decision
Directed(DD) method as phase detector and a fractionally spaced constant modu
lus algorithm(FSCMA) equalization to improve demodulation performance.A recei
ver based on the technology is implemented by using field programmable gate arra
y (FPGA) and a 600 Megabits per second（Mbps）8PSK signal has been tested. Accor
ding to the theoretical approach, the demodulation loss difference between teste
d value and theoretical value is less than 2 dB when the Bit Error Rate（BE
R） ranges 1×10-3 to 1×10-8. China′s new generation TDRSS can
employ the receiver as its wideband 8PSK demodulator. |
| Key words: TT&C system high data rate receiver(HDR) 8PSK demodulator carrier synchronizat
ion timing recovery constant modulus equalizer TDRSS |
