| 1, Introduction Marconi from 1897 at a fixed | | | | communications system design challenging |
| station with a tug to complete the wireless | | | | problems. |
| communication between the trial began, wireless | | | | 2,4 G system platform architecture structures |
| Communications technology Has been rapid | | | | the problems faced by |
| development. Communications industry is currently | | | | (1) digital baseband processor of the increased |
| hot technologies third generation mobile | | | | complexity of the algorithm |
| communication ( 3G ) Has a higher radio | | | | 4G mobile communication system was introduced |
| frequency utilization efficiency, can provide fast, | | | | in MIMO wireless communication technology. That |
| convenient wireless applications, high-speed data | | | | is, distributed access methods, the transmission |
| transmission and broadband multimedia services | | | | signal by multiple antennas to send and receive at |
| (transmission speed minimum 384k, up to 2M). | | | | the same time, the sender and the receiver |
| Although the 3G system than the old 2G system | | | | between the radio channel from the traditional |
| many times faster transmission speed, but still | | | | single input single output (SISO) system into |
| can not meet future demand for multimedia | | | | (MIMO) system. MIMO channel can be viewed as |
| communications. Future Communications market | | | | a set of parallel subchannels, the total channel |
| Mainstream services need to provide customers | | | | capacity for the independence of the channel |
| with convenient access to information worldwide | | | | capacity of quantum channel and, in theory, with |
| consulting capacity, so the future of | | | | the number of antennas increase, significantly |
| communications services must have broadband | | | | increased channel capacity, to improve the |
| (Broadband), global (Globalization), instant | | | | wireless network information throughput, expand |
| (Immediacy) and mobility (Mobility). To achieve | | | | coverage and improve the quality of transmission |
| this goal, we must be unlimited broadband | | | | offers great potential. However, under |
| Internet access and broadband integrated | | | | multi-antenna MIMO wireless communication |
| communications network, but to achieve the | | | | system problem caused by the baseband signal |
| broadband wireless communication networks and | | | | processing complexity of geometric growth. |
| the integration of the core backbone network, | | | | Programmable logic device according to the |
| including 3G, including the use of current mobile | | | | existing logic of scale, it is difficult in the conditions |
| communication networks are not, and the | | | | of single or veneer to achieve all of the base-band |
| development of 4G wireless communication | | | | logic algorithm, a necessary requirement for the |
| technology to support wireless Internet access | | | | base station platform for complex interconnect |
| has become essential. Not yet developed the | | | | structure. |
| international unity of 4G communications | | | | (2) huge amount of real time data transfer |
| standards, developed countries have hope in the | | | | requirements |
| future 4G standards to gain a place, Europe and | | | | 4G system, the physical layer baseband |
| the United States and Japan, have long invested | | | | processing required to deal with the transmission |
| heavily in research, and China also in 2002 | | | | of data between nodes with high real time. If |
| launched a research and development of 4G | | | | using the traditional shared bus type (such as: PCI, |
| Basically, the international synchronization. | | | | CompactPCI, etc.), with the baseband processor |
| According to the forecast, 4G systems will use a | | | | nodes increases, the amount of data between |
| lot of new generation of advanced | | | | nodes increases rapidly interactive, real-time |
| communications technologies such as OFDM, SDR, | | | | transmission between devices is bound to affect |
| MIMO and smart Antenna , Space-time coding, | | | | performance. Therefore, the traditional |
| providing peak rates up to 100Mb / s, to meet | | | | share-based architecture with the bus system is |
| future high-bandwidth real-time multimedia | | | | difficult to achieve these requirements. Necessary |
| services to business needs. However, with this | | | | to design a new platform architecture to ensure |
| series of wide application of the latest technology, | | | | scalability in a good premise, to achieve |
| the new generation system, the algorithm | | | | connectivity between devices on the bus for data |
| complexity and the overall transmission | | | | transfer latency when a small bus. |
| performance than the previous generation | | | | (3) high scalability and flexibility requirements |
| system has an order of magnitude increase, how | | | | Current international standards for 4G systems |
| many of the processing system, the control unit | | | | has not been determined, using the baseband |
| to provide an efficient, high- bandwidth, flexible | | | | processing algorithms and link layer protocols are |
| interconnect architecture, a 4G wireless | | | | still ongoing verification and perfection. |