Digital predistortion method and device for TD-SCDMA system
A TD-SCDMA and digital predistortion technology, applied in the field of wireless communication, can solve the problems affecting the performance of digital predistortion, long calculation time, and large calculation amount of DPD module, so as to reduce device power consumption, reduce calculation amount, and save Calculate the effect of time
Inactive Publication Date: 2010-07-21
ZTE CORP
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Problems solved by technology
This makes the calculation of the DPD module very large, and the calculation time is long, which affects the performance of digital pre-distortion
If the calculation efficiency of the DPD module is further improved on the basis of a large amount of calculation, it will inevitably increase the research and development cost of the device
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[0032]In order to further explain the technical means and effects adopted by the present invention to achieve the intended purpose, a kind of digital predistortion method and device for TD-SCDMA system proposed by the present invention will be described in detail below in conjunction with the accompanying drawings and preferred embodiments As later.
[0033] Such as figure 2 As shown, in the frame structure of the TD-SCDMA system, each subframe includes a special time slot and seven regular time slots: TS0~TS6, in which the first regular time slot TS0, the fifth regular time slot TS4, the sixth regular time slot The slot TS5 and the seventh regular time slot TS6 are configured as downlink time slots, and the second regular time slot TS1, the third regular time slot TS2 and the fourth regular time slot TS3 are configured as uplink time slots. Each normal time slot includes a training sequence Midamble code, a guard time slot GP, and two data areas: a first data area Data1 and...
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The invention discloses a digital predistortion method and a device for a TD-SCDMA system. the method of the invention comprises the following steps that: step 1. when the current time slot signal is a downlink time slot and a DPD module is started, setting a counting threshold and an average power threshold of a counter; step 2. selecting medium frequency feedback data of m symbols from the data area of the current downlink time slot, and computing to obtain the average power of time slot signals; and step 3. by judging the average power or counting number of times of the time slot signals obtained by sampling and computing of a medium frequency feedback signal part interval, finding the medium frequency feedback data required to be sampled, and simultaneously discarding the medium frequency feedback data not required to be sampled, thereby avoiding carrying out continual searching, collection and parameter estimation on all medium frequency feedback data in a feedback channel, notably reducing the computing capacity of the DPD module, saving the computing time and reducing power consumption of devices.
Description
technical field [0001] The present invention relates to the field of wireless communication, in particular to a DPD (Digital Pre-Distortion) method and device for a TD-SCDMA (Time Division-Synchronous Code Division Multiple Access) system. Background technique [0002] The realization of radio frequency technology is one of the key technologies for the industrialization of TD-SCDMA system. In order to pursue higher data rates and spectral efficiency, TD-SCDMA systems generally use linear modulation. In addition, the multi-carrier configuration technology leads to changes in the signal envelope, resulting in intermodulation distortion. Although spectrum regeneration has little impact on the current channel, it will interfere with adjacent channels. The non-constant envelope modulation technology used in 3G communication system requires the transmitter to work in a linear state, so linearization technology and efficiency enhancement technology become the key points of power a...
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IPC IPC(8): H04W52/42H04B1/69
CPCY02B60/50
Inventor 冯波段义军
Owner ZTE CORP