与其他的USB调制解调器不同，250U集成了天线以获得更好的接收效果。
Unlike most other USB modems, the 250U has jacks to connect an external antenna for better reception.
空时编码采用多发送天线设计信道编码，联合考虑分集、编码与调制，从而提高信号在无线衰落信道中传输的可靠性。
The design of channel codes for improving the reliability of communications over fading channel using multiple transmit antennas is considered.
该文针对发射天线数为偶数的系统，提出了一种降低接收机计算复杂度的差分空时调制方案。
To reduce receiver complexity, a new DUSTM scheme is proposed for systems where the number of transmit antennas is even.
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