Td-scdma Design And Implementation Of Dual - Band Receiver

With the development of society, the degree of information will be increasingly high. Mobile communication system, which is one of the important parts for informationization, will also be continuously high-speed evolving. In 1983, the"Advanced Mobile Phone System"(AMPS), which was developed by AT&T and Motorola, opened the first commercial cellular systems in US. That is called the first generation analog communication system (1G). Nowadays, the third generation mobile communication system (3G) had been widely used all over the world. And the third generation mobile communication standard (TD-SCDMA) which is developed by our own is gradually spread in our country. It is no doubt that, in the near future, 3G will take the place of 2G or 2.5G, and becoming the most widely used mobile communication system in the world. Being our own standard, TD-SCDMA has many advantages, including high spectral efficiency, supporting various of communication interface, strong spectrum flexibility, high system performance stability, good compatibility with traditional systems, low system equipments cost. That makes TD-SCDMA becoming one of the three 3G standards now in the world. Till now, China government had approved 1880~1900MHz (A band) and 2010~2025MHz (B band) for TD-SCDMA, totally 35MHz.A radio front-end receiver for communication system design will be introduced in this paper briefly. Based on《YD-T 1365-2006 Technical requirements for RAN equipment of 2GHz TD-SCDMA digital cellular mobile communication network》, a dual band TD-SCDMA base station radio receiver will be designed and finished, supporting 1880～1900MHz and 2010～2025MHz time-sharing receiving, also for both in-door and out-door usage.The design is based on distributed duplexer, balanced low noise amplifier. It can lower the performance requirements of the first filter, fulfill dual band time-sharing receiving, and satisfy the noise requirement for receiver. During the design,several factors that mainly affect the receiver performance will be analyzed, including receiver structure, noise figure, dynamic range, link budget, intermediate frequency and blocking. With the help of CAD simulation software, several critical radio parts like cavity duplexer, LNA, RF amplifier had been simulated and verified. Successfully design a cavity duplexer, a wideband LNA, a RF amplifier, a mixer and variable gain amplifier, verified the link budget and satisfy the requirements.