Implementation of Rate Matching with Low Latency and Little Memory for LTE Turbo Code

摘要

In LTE (Long Term Evolution), the high utilization for physical resources is achieved by scheduling suitable number of time frequency resource elements for one user in one subframe. This is supported by the rate matching module that selecting arbitrary number of bits from the turbo coding bit streams. In this paper, a closed-form rate matching implementation method is proposed. It derives an integrated expression which is normalized for the 3 turbo coding streams. This expression sets up a mapping relationship between the bit streams input to and the bit sequence output from rate matching module. Moreover, the expression can be applied to rate de-matching processing in the receiver end. Compared with the existing method, the rate matching method that we proposed generates low latency and requires small memory.