Channel interpolation for digital mobile radio communications

Digital cellular radio (DCR) communications occur over a fading multipath channel. In the case of low bit-rate, narrowband communications, a fast adaptive algorithm is required to track the rapid time variations in the DCR channel. The authors demonstrate the feasibility of a novel block-adaptive strategy which computes the time-varying channel impulse response (CIR) by interpolating a set of CIR estimates obtained through periodic training. Furthermore, they have discovered that channel tracking is limited by the CIR estimation noise rather than by the CIR interpolation