您要查找的是不是：
- 空頻多普勒OFDM編碼space-frequency-Doppler coded OFDM
- 空頻編碼space-frequency coding
- 分布式空頻編碼distributed space-frequency coding
- 清空empty
- 空回backlash
- 非相干空頻編碼noncoherent space-frequency coding
- 頻數frequence
- 盤(pán)空circle or whirl in the air
- 主頻dominant frequency
- 倍頻frequency doubling
- 編碼OFDMeoded-orthogonal-frequeney-division-muhiplexing (COFDM)
- 占空比dutyfactor
- 載頻carrier frequency
- 賣(mài)空oversell
- 分頻frequency demultiplication
- 排空emptying
- 分頻器frequency demultiplier
- 青空hyaline
- 頻點(diǎn)frequency point
- 留空leave a blank
