  This paper presents a reconfigurable intelligent sensing surface (RISS) that
combines passive and active elements to achieve simultaneous reflection and
direction of arrival (DOA) estimation tasks. By utilizing DOA information from
the RISS instead of conventional channel estimation, the pilot overhead is
reduced and the RISS becomes independent of the hybrid access point (HAP),
enabling efficient operation. Specifically, the RISS autonomously estimates the
DOA of uplink signals from single-antenna users and reflects them using the
HAP's slowly varying DOA information. During downlink transmission, it updates
the HAP's DOA information and designs the reflection phase of energy signals
based on the latest user DOA information. The paper includes a comprehensive
performance analysis, covering system design, protocol details, receiving
performance, and RISS deployment suggestions. We derive a closed-form
expression to analyze system performance under DOA errors, and calculate the
statistical distribution of user received energy using the moment-matching
technique. We provide a recommended transmit power to meet a specified outage
probability and energy threshold. Numerical results demonstrate that the
proposed system outperforms the conventional counterpart by 2.3 dB and 4.7 dB
for Rician factors $\kappa_h=\kappa_G=1$ and $\kappa_h=\kappa_G=10$,
respectively.
