为了获得信道的满多径分集增益，基于直接序列扩频和线性频域均衡，提出了一种单载波块传输系统。发射信号在时域的直接序列扩频，造成了信号在频域的重复和交织。接收端通过最大比合并频域均衡，均衡和解扩同时在频域内完成。理论分析表明，对于多径数目为L的多径信道，系统可以获得分集阶数为L的满多径分集增益。与传统的线性频域均衡系统相比，系统具有更低的误码率和更低的计算复杂度。理论分析的结果通过计算机仿真进行了验证。%If the signal receiver simply relies on linear equalization , itis difficult for the block transmission system to obtain the full multipath diversity gains of the wireless channel .To achieve this , we propose a single carrier block transmission system based on direct sequence spreading and maximum ratio combination frequency domain equaliza -tion.The direct sequence spreading of transmission signals in the time domain results in signal repetition and inter -leaving in the frequency domain .Through maximal ratio combination frequency domain equalization , the despreading and equalization are carried out simultaneously in the frequency domain .The simulation results , given in Figs.2, 3 and 4, and their analysis show preliminarily that:(1) the block transmission system we proposed can obtain full multipath diversity gains (2) it has lower computational complexity and bit error rate than the conven-tional linear frequency domain equalizer .
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