扩频技术中，接收链路中数据恢复之前移去扩频码，称为解扩。解扩是在信号的原始带宽上重新构建信息。显然，在信息传输通路的两端需要预先知道扩频码。
基于FPGA的数字解扩解调模块设计及实现[电子设计网] Key words: despread;demodulate;Costas loop;carrier synchronization;FPGA;loop filter [gap=172]关键词：解扩;解调;Costas环;载波同步;FPGA;环路滤...
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Whereas study indicates that by adding preprocessing unit before correlation despreading unit in receivers, the narrowband interference rejection ability may be improved greatly. At the same time, spread factor spread spectrum system itself has may not be added.
然而研究表明,通过在扩频接收机的相关解扩环节前加上预处理环节,则可以大大提高扩频接收机的抗窄带干扰能力,而扩频系统本身的扩展因子则无需加大。
参考来源 - 新型扩频接收机的研究But it is not the same circumstance when to perform beamforming for the despreaded array signals, because the multipath signals with different delays are became coherent signals after dispreading and can be utilized.
然而在对解扩后的阵列信号进行波束形成处理时情况将发生变化,这是因为传播时延不同的多径信号经过解扩之后变为相干信号,可以被加以利用。
参考来源 - 空时分集接收相关技术研究Via de-spreading at the receiver, co-channel interferences are effectively eliminated and thus signals from different transmit antennas are distinguished and independently detected. In addition, the proposed receiver adopts RAKE reception to achieve the optimal performance.
在保持BLAST分层传输结构的基础上,发射机对每路信号进行扩频处理;接收机通过解扩抑制共信道干扰、分离各路发射信号,实现各路信号的独立检测,并采用RAKE接收以获得最佳的检测性能。
参考来源 - 基于阵列信号处理的空时编码技术研究·2,447,543篇论文数据，部分数据来源于NoteExpress
针对长码实值混沌直扩系统，提出了两种盲解扩算法。
Two new methods are developed for blind estimation for long-code chaotic spread spectrum sequence.
扩频系统中性能最好的是直接序列扩频的先解扩后解调方式。
Direct sequence spread spectrum (DSSS) and despreading first structure is most advantageous of all kinds of spread spectrum techniques.
其扩频信号由合成滤波器产生，而分析滤波器则执行解扩过程。
The transmitted signal is generated by a synthesis filter bank and the demodulation process is performed by an analysis filter bank.
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