access in TD-SCDMA

TD-HSDPA which stands for high speed downlink packet access in TD-SCDMA is an enhanced technique of the 3rd generation mobile communication standard. The purpose of introducing this technique is facing the increasing data communication service and strengthening the competition of the standard. For achieving high data rate communication, besides the improved architecture and techniques such as AMC and HARQ.Based on the discussion of the principle and backgrounds of HSDPA,the applications of HARQ in HSDPA for TD-SCDMA system are studied in this thesis.In the thesis, the key technologies of the HSDPA system are analyzed, and the similarities and differences of the TD-HSDPA and W-HSDPA are compared. Deducing the highest rate that could be achieved in multi-carrier TD-HSDPA, furthermore, it proves that TD-HSDPA is more advantage than W-HSDPA in the spectrum efficiency. Hybrid ARQ type, working mechanism, application etc are researched, an improved CA-HARQ program is put forward, which based on channel current situation determining the initial parity bit, meanwhile carrying out a simulation, which show that the new programs introduced can reduced retransmission number and data transmission delay with the throughput rate uncharged basically.The throughput of various modulation coding schemes at different types of HARQ is simulated through PA3 and VA30 channel, it could obtain that the optimal use range and optimal HARQ type around different modulation coding scheme. The simulation concludes that changing Node B side modulation coding scheme can improve system throughout with the change in signal to noise ratio; choosing an appropriate HARQ scheme may be able to further improve data transfer rate to a fixed modulation coding scheme.
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effectively compressed

The numerical results show that the pulse can get effectively compressed and magnified at the beginning phase after transmitted without the influence of intrapulse cheap womens nike shoes Raman scattering; However, under the influence of intrapulse Raman scattering , pusles form a delay pulse and an ahead pulse, and the ahead pulse will continue to cheap men's nike shoes split into a new delay pulse and a new ahead pulse, and finally form a delay pulse sequence with roughly same direction of nike running shoes transmission, pulse width and amplitude. It is also show that the intrapulse Raman scattering can be weakened to some extent after inputting chirped nike shoespulse. The amplification of ultrashort optical pulses in EDFA is researched. The numerical results show that if the initial distance of near optical pulses is short,the two optical pulses will attract each other and produce a new pulse in the course of nike trainers amplification. As a result, the efficiency of optical pulses amplification will be lower. After enlarging the initial distance, the efficiency of optical pulses amplification will not improve effectively. The transmission of optical pulses introduced initial chirp in EDFA is researched. The results show that after introducing suitable initial chirp, the negative impacts from optical pulses intercation will reduce , the quality of amplification can improve.
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