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This paper re-examines the well-known fundamental tradeoffs between rate andreliability for the multi-antenna, block Rayleigh fading channel in the highsignal to noise ratio (SNR) regime when (i) the transmitter has access to(noiseless) one bit per coherence-interval of causal channel state information(CSI) and (ii) soft decoding delays together with worst-case delay guaranteesare acceptable. A key finding of this work is that substantial improvements inreliability can be realized with a very short expected delay and a slightlylonger (but bounded) worst-case decoding delay guarantee in communicationsystems where the transmitter has access to even one bit per coherence intervalof causal CSI. While similar in spirit to the recent work on communicationsystems based on automatic repeat requests (ARQ) where decoding failure isknown at the transmitter and leads to re-transmission, here transmitside-information is purely based on CSI. The findings reported here also lendfurther support to an emerging understanding that decoding delay (related tothroughput) and codeword blocklength (related to coding complexity and delays)are distinctly different design parameters which can be tuned to controlreliability.

Benefit of Delay on the Diversity-Multiplexing Tradeoffs of MIMO Channels with Partial CSI