Research On HSDPA Technology In WCDMA System And Novel Soft Handover Algorithm

With more and more requirement of wireless Internet traffic in present information society, the rate of transmission which has reached 2Mb/s could hardly meet the demand. In this situation various enhanced technologies have gradually adopted by the 3rd mobile telecommunication systems, which will provide higher rate of packet transmission and spectrum efficiency to asymmetric wireless Internet traffic.WCDMA is one of the 3rd mobile telecommunication systems criteria.It adopts High Speed Downlink Packet Access (HSDPA) in Release 5 which can transmit downlink packets at the rate of 10Mb/s.High speed packet data has the characters of asymmetric, high peak rate and short active time. To use radio spectrum resource efficiently, a physical channel has been specially added in WCDMA system which is called High Speed Downlink Shared Channel (HS-DSCH).HS-DSCH is used for high speed packet transmission shared by multi-users.HSDPA has many key technologies, which are Adaptive Modulation Code (AMC), Hybrid Automatic Repeat reQuest (HARQ), fast scheduler and so on. With these technologies the data throughput will be greatly improved.At first this thesis introduces WCDMA system theory, HSDPA technologies applied in WCDMA system; Secondly research on the application of HSDPA technology in WCDMA system, the realization of high speed data transmission and the evaluation on the influence on WCDMA system when HSDPA...