Message Passing-Based Joint Channel Estimation and Signal Detection for OTFS with Superimposed Pilots
arxiv(2023)
摘要
Receivers with joint channel estimation and signal detection using
superimposed pilots (SP) can achieve high transmission efficiency in orthogonal
time frequency space (OTFS) systems. However, existing receivers have high
computational complexity, hindering their practical applications. In this work,
with SP in the delay-Doppler (DD) domain and the generalized complex
exponential (GCE) basis expansion modeling (BEM) for channels, a message
passing-based SP-DD iterative receiver is proposed, which drastically reduces
the computational complexity while with marginal performance loss, compared to
existing ones. To facilitate channel estimation (CE) in the proposed receiver,
we design pilot signal to achieve pilot power concentration in the frequency
domain, thereby developing an SP-DD-D receiver that can effectively reduce the
power of the pilot signal and almost no loss of CE accuracy. Extensive
simulation results are provided to demonstrate the superiority of the proposed
SP-DD-D receiver.
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