Interference estimation and scaling for efficient metric storage and interference immunity

摘要

A system, wireless device ( 402 ) and method receive a set of soft metrics ( 614 ) associated with a block of symbols during a predetermined time interval, use the set of soft metrics ( 614 ) to form an initial interference power estimate, form a moving-average estimate of interference power ( 616 ) corresponding to each predetermined time interval, and scale the set of soft metrics ( 614 ) according to the corresponding interference power estimate resulting in a set of scaled metrics ( 618 ). Then they limit the dynamic range of the set of scaled metrics ( 618 ), linearly quantize the limited metrics, and output the linearly quantized limited metrics ( 628 ) to a memory buffer. The size of the memory buffer containing the linearly quantized limited metrics ( 628 ) is smaller than the size of a memory buffer required to store the received soft metrics ( 614 ). The linearly quantized limited metrics ( 628 ) are then used as input to a decoder.