Decoder and decoding method for mobile communication system terminal channels

Abstract

The invention discloses a channel decoder used applying for the third generation mobile communications system terminals, relating to the channel decoder and its corresponding method based on the hardware. To solve inefficiency of the existing decoders, the channel decoder includes: the channel type judging module for judging the wireless signal data channel type, more than one channel decoding logic modules for decoding by each transmission channel, the control module for controlling the channel decoding logic modules. The invention also discloses the decoding method, including: judging the type of channels for transmitting data, selecting and starting the channel decoding logic module according to the determined type, conducting decoding according to the chosen decoding logic modules.

Description

technical field [0001] The invention relates to a channel decoder in a mobile communication system and a decoding method thereof, in particular to a channel decoder and a corresponding decoding method which realize decoding based on hardware. Background technique [0002] Channel decoding is an important part of the terminal physical layer of the 3G communication system. As shown in Figure 1, taking TD-SCDMA as an example, the channel decoding process is: after receiving the radio frequency signal, complete JD (Joint Detection, joint detection) according to relevant parameters, then output the decoding of soft bits, and finally decode the The final data is sent to the high layer (High Layer) process. [0003] The channel types that need to be processed in channel decoding are: DCH (Dedicated Transport Channel), BCH (Broadcast Channel), FACH (Forward Access Channel), PCH (Paging Channel), PICH (Paging Indicator Channel) and FPACH (Fast Physical access channels), in which th...

AI Technical Summary

Problems solved by technology

[0006] (1) In order to meet the decoding methods of different channels, most of the existing channel decoding is realized by software, which will consume a large amount of DSP computing resources; most of the existing mobile terminals realize channel decoding through pure software, which is Consumes more than 60% of the DSP computing resources of the entire system

Some other terminals just implement the Viterbi and Turbo decoding algorithms by hardware, and most of the channel decoding processes are still implemented by software, which can only save a small part (about 10%) of calculations, and the whole decoding process still requires a lot of DSP computing resources

This undoubtedly caused a reduction in terminal performance

[0007] (2) Implementation strategy: call the respective channel decoding functions for different channel types, so that it is necessary to write and test the decoding functions for each channel, and the workload is heavy

Since there are a large number of judgment and calculation processes in the decoding and scheduling process of each service, there are complex scheduling processes between various services and multiple transmission channels of the same service, so the code implementation is difficult and error-prone. High probability and testing effort

[0009] (4) Memory allocation principle: allocate the maximum memory space required according to the maximum possible combination of transmission channels; the decoding scheduling period of each transmission channel may be different, and before a TrCH decoding process is executed, the data about the channel must be It is completely reserved, so it is necessary to open up a Buffer (cache) that can contain the complete decoding data of all transmission channels. For terminals with relatively limited system resources, it causes huge resource consumption.

[0010] (5) Code usage efficiency: The software implementation strategy is likely to lead to code development on different platforms, poor portability and reusability

The language platform used by each DSP may be different. When developing on a new DSP, the code developed in the past often cannot be transplanted and must be recoded; cannot be used directly

The workload of development and testing will also be relatively large

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