A transmission method of ts0 time slot signal in td-scdma system

A TD-SCDMA, time slot technology, applied in the field of Doppler frequency shift, can solve problems such as inability to overcome Doppler spread, UE unable to receive TS0 signal correctly, no uplink channel, etc.

Active Publication Date: 2011-12-14
TD TECH COMM TECH LTD
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Problems solved by technology

For the above-mentioned Doppler spread, if it is not resolved, the UE cannot receive the TS0 signal correctly
However, since the TS0 time slot is used to carry broadcast signals, there is no corresponding uplink channel, so the base s

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  • A transmission method of ts0 time slot signal in td-scdma system
  • A transmission method of ts0 time slot signal in td-scdma system
  • A transmission method of ts0 time slot signal in td-scdma system

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Embodiment Construction

[0043] In order to make the purpose, technical means and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0044]In the technical solution given in the background technology, the TS0 time slot includes a total of 848 chips. In order to perform channel estimation, the network side carries the midamble sequence in the middle 128+16 chips of the TS0 time slot. In this way, the UE stores The midamble sequence and the midamble signal received from the network side are used for channel estimation, and the channel estimation result is used as the channel characteristic of the entire TS0 time slot for demodulation and decoding of common channel signals. In the above channel estimation process, since the midamble sequence is carried by the middle 144 chips of the TS0 time slot, the channel estimation result obtained according to the midamble sequence estimation actually accurately...

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Abstract

The invention discloses a transmission method of a TS0 time slot signal, comprising: an RRU in a high-speed rail cell transmits a common channel signal and a preset pilot signal that lasts for the entire TS0 time slot on the TS0 time slot, wherein the common channel signal and The pilot signals are on mutually orthogonal code channels; the high-speed rail repeater located on the high-speed railway train, for any carrier, receives the pilot signal in the TS0 time slot, and estimates the time of TS0 according to the pilot signal saved by itself. The channel characteristic of each chip on the slot; according to the channel characteristic of each chip on the estimated TS0 time slot, carry out MMSE demodulation to the common channel signal on the TS0 time slot, and obtain the chip-level signal of the common channel signal; Carry the obtained chip-level signal on any carrier and send it to the UE on the high-speed railway train. By applying the present invention, Doppler spread can be overcome, and the signal receiving performance of the UE on the TS0 time slot in the high-speed rail cell can be improved.

Description

technical field [0001] The invention relates to the Doppler frequency shift technology of the communication system under the condition of high-speed movement, in particular to a transmission method of the TS0 time slot signal in the TD-SCDMA system. Background technique [0002] In a wireless communication system, when a user equipment (UE) moves at a high speed, Doppler frequency shift occurs. Doppler frequency shift is the biggest problem facing high-speed railway coverage. The current solutions to Doppler frequency shift are as follows: [0003] (1) UE automatic frequency control (AFC): UE performs automatic frequency control in real time to lock the frequency of the base station; [0004] (2) Auxiliary AFC of the base station: the base station can estimate the frequency offset of the UE through the uplink, and compensate it in the downlink, so as to reduce the requirement on the UE's AFC function. [0005] At the same time, handover is also a problem of high-speed cove...

Claims

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Application Information

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IPC IPC(8): H04B7/26
Inventor 徐绍君肖健袁乃华杨春兰张峰
Owner TD TECH COMM TECH LTD
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