RADIX -2 AND RADIX -4 STATE METRIC ARCHITECTURES FOR TURBO DECODER

摘要

Systems, methods, devices, and computer program products are described for Turbo decoding in a wireless communication system. Turbo encoded wireless signals may be received and demodulated, and forwarded to a branch metric calculator. The branch metric calculator may calculate a set of branch metrics for the demodulated signal. A state metric unit may receive the set of branch metrics and a previously calculated set of state metrics. Alternative designs of fast radix- 2 and radix- 4 state metric units (SMU)have been developed in order to improve speed, increase throughput, lower cost and/or improve power efficiency. The state metric unit may perform various comparisons of the set of state metrics before the received set of branch metrics is added to a portion of the state metrics identified through the comparisons.