A turbo code decoder with low storage capacity and its design method

Abstract

The invention provides a Turbo code encoder with the low storage capacity and a design method of the Turbo code encoder. The Turbo code encoder comprises a BMUalpha and a BMUbeta. The BMUbeta and an LIFO SMC storage are connected. The BMUalpha and the LIFO SMC storage are both connected to a posterior probability LLR calculation unit. The BMUbeta and the LIFO SMC storage are connected through a compression calculation unit. The LIFO SMC storage and the posterior probability LLR calculation unit are connected through a regeneration calculation unit. Backward measurement processes are ranked through the compression calculation unit, a serial number array is established, and the increment is calculated. The serial number array and the increment are stored in the LIFO SMC storage. The regeneration calculation unit has access to the serial number array and the increment in the LIFO SMC storage, so that backward measurement is estimated. According to the Turbo code encoder, the LIFO SMC capacity is reduced, the effect is better, the encoder is suitable for single-bit Turbo codes and binary Turbo codes, and therefore structural design schemes of the encoder with the low LIFO SMC capacity are unified.

Description

technical field [0001] The invention relates to the technical field of communication, and more specifically, relates to a turbo code decoder with low storage capacity and a design method thereof. Background technique [0002] Turbo codes are a class of error-correcting codes approaching the Shannon limit, which can improve system capacity and communication service quality. At present, they have been widely used in modern large-capacity broadband communication systems, and have formed a series of technical standards, such as the third The 3GPP standard of the first generation mobile communication, the global microwave interconnection access WiMAX, the fourth generation broadband large-capacity wireless communication system 802.16m, etc. In a receiver using Turbo codes, the structural design of a Turbo code decoder has a very important impact on the overall performance of the receiver. The structure of the classic turbo code component decoder is as follows: figure 1 As shown...

AI Technical Summary

Problems solved by technology

For double binary Turbo codes, because the trellis diagram is much more complex than that of single-bit Turbo codes, the inversion calculation method is too complicated, and the decoding delay is relatively large, and a retrospective calculation decoder design method is proposed.

Images