Wednesday, April 7, 2010

China Mobile

On January 7th, 2009, 3G licenses were issued. China Mobile got a TD-SCDMA license, China Unicom got a WCDMA license, and China Telecom got a CDMA2000 license. 3G war broke up between mobile operators. As China’s independent 3G standard, Cheap Lacoste Polo Shirts attracted people’s attention.High-Quality network coverage is very important to mobile operators. The indoor wireless business is gradually increasing. Enhancing indoor coverage is a problem faced by mobile operators. Because of the environmental constraints, TD-SCDMA base station can’t chi flat iron use smart antennas in indoor areas. Besides, substantial business exists in business building. The traditional outdoor base stations can’t meet the requirements, micro base stations are needed.From a prototype designer’s point of view, this paper will analyze the performance of the receiver in order to design an uplink signal processing scheme to meets the testing requirements of the protocol.In accordance with the analysis of the men's nike shoes physical layer protocol, the uplink signal processing flow was given at first.Based on an engineering perspective, chapter 3 explained the implementation steps of the key technologies, including uplink synchronization, channel estimation and joint-detection. Since the matrix inversion for joint-detection has a problem about high computational complexity, two matrix inversion algorithms was introduced in order to reduce the complexity.Based on protocol analysis and algorithm for uplink system chi hair straighteners structure, the performance of uplink synchronization measurement has been analyzed changing the number of users.Then simulation results of ZF-BLE and MMSE-BLE for joint detection have been compared. Impact of some interference, such as number of users, number of receiving antennas and channel model, to the ralph lauren polo shirts receiver has also been analyzed in Chapter 4.Finally, DSP implementation of the uplink base-band signal processing flow has been given, and the sensitivity test has proved that the hardware discount wedding dresses implementation meets the testing requirements of the protocol.The result shows that the uplink signal processing scheme given in the paper is feasible. It lays a foundation for the large scale commercial applications of micro base stations, which is of great theoretical importance and economic value.
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