Second the paper studies unitary space-time demodulation and put forward a new group modulation technology which aborts a little bit error rate for reducing complexity significantly .

然后研究了 酉空时解调技术，并提出一种新的分组解调方法，该方法可以用比较小的误 码率的损失换取了复杂度的大幅度降低。

For instance the disadvantages such as large group time delay low technical specification unitary function slow RX / TX conversion rate and bad EMC performance etc. have limited to a great extent the generalization of new digital HF communication system .

例如，群时延大、技术指标偏低、功能 单一、收发转换 速度慢以及电磁兼容性能差等弱点都在很大程度上限制了新的数字化体制的推广。

A new method of unitary space-time constellation which can improve the influence on block error rate by fast fading is designed based on a systematic method .

在系统化 酉空时星座设计方法的基础上，提出了一种抗 信道快变的酉空时星座设计方案。

Using the enterprise prosperity index we can set unitary linear regression model to predict GDP quarterly cumulative total growth rate for short-term forecasting . The credibility of forecasting results is quite high . 4 .

可以建立 一 元线性回归模型，利用企业景气指数预测数据对GDP季度累计增长 率进行短期预测，预测结果可信度比较高。