研究现有测绘部门的符号规范，实现了空间数据符号映射匹配。
Bringing forward mapping of spatial data, which is based on studying of symbol criterion in existing surveying department.
但由于其符号映射和检测在时域完成，因此在SC - FDE系统中利用信道状态信息来完成自适应调制，并不像OFDM那样直接。
But SC-FDE cannot finish adaptive modulation utilizing CSI directly like OFDM due to it has to make symbol mapping and detecting in time domain.
实现不同帧之间的比特交织等。 COFDM调制部分包括块划分及COFDM符号形成、DQPSK符号映射、频率交织、差分调制及COFDM调制等环节。
The COFDM modulation part is made up of blocks partition, COFDM symbol forming, DQPSK symbol mapping, frequency interleaving, difference modulation and COFDM modulation and so on.
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