| 1. | Hybrid spread spectrum
混合扩频 |
| 2. | A new hybrid spread - spectrum ( ds - fh ) communication mode is discussed in detail in this paper , walsh sequence is used as frequency - hopping sequence in this mode
本文将讨论一种新型的ds - fh混合扩频通信系统。在这种系统中，使用walsh函数序列作为跳频序列。 |
| 3. | Combining walsh sequence with direct spread spectrum sequence , we can construct hybrid ds - fh spread - spectrum communication mode . this is very important for the mode to have better performance on anti - multiple - access inference and anti - near - far inference
将walsh函数序列与直接扩频序列相结合构成的ds - fh混合扩频通信方式对于系统抗多址干扰和远近效应具有重要意义。 |
| 4. | To combine theoretical and simulating productions with the practical application , we use cpld chip to realize the hardware flat of hybrid ds - fh spread spectrum communication system , which provides the basic of the further practicability
为将理论及仿真成果与实际应用相结合，本文应用cpld器件芯片实现了ds - fh混合扩频系统发射部分的硬件平台，为它的进一步实用化奠定了基础。 |
| 5. | It is from software programming realizations direct serial spread spectrum modulate ( ds - ss ) , frequency flip spread spectrum modulate ( fh - ss ) , spread spectrum and frequency flip mix spread spectrum modulate ( fh / ds ) and a lot of other spread spectrum modulate
通过软件编程实现了直接序列扩频( ds - ss )调制、频率跳变扩频( fh - ss )调制、跳频直扩混合扩频( fh ds )调制等多种扩频调制。 |
| 6. | Ds / fh hybrid spread - spectrum communication system base on software radio is researched in theory . performance of the system is analyzed and evaluated in anti - jamming by software simulation . so it testify feasibility of the system
本课题针对这方面作了详细地讨论，就基于软件无线电技术的ds fh混合扩频通信系统从理论方面进行了研究，通过仿真，对系统在抗干扰方面的性能作了分析，并进行了性能评估，从而验证了系统的可行性。 |
| 7. | To assure that the hybrid ds - fh spread - spectrum communication mode has better capability of information safety and inference suppression , i bring forward a design scheme of ds - fh spread - spectrum communication system and solving effectively the crucial problem such as how to choose the user address , how to choose the hopping frequency and how to avoid the collision of the frequency which is used by different users at the same time
为保证系统可靠、有效地工作，本文提出了一种ds - fh混合扩频系统的设计方案，并且有效地解决了系统的用户选址、频率选择和频率碰撞等关键问题。通过系统设计仿真证实了ds - fh混合扩频系统具有优于ds系统的抗干扰性能，并在一定程度上提高了系统的抗远近效应能力。 |
| 8. | In addition , hybrid spread - spectrum communication system is propitious to enhance anti - jamming performance of the system that is make up of direct sequence ( ds ) and frequency hopping ( fh ) , and it can satisfy the require of anti - jamming of systems . it concentrate their virtue and overcome shortage in single spread spectrum style . this paper discusses the aspect in detail
另外，将扩频技术中应用最广泛的两项技术直序扩频( ds )和跳频( fh )结合在一起，构成混合扩频通信系统，有利于提高系统的抗干扰性能，更能满足系统抗干扰的要求，而且将跳频系统和直扩系统的优点集中起来，克服了单一扩频方式的不足。 |
