  Joint estimation of carrier frequency and direction of arrival (DOA) for
multiple signals has been found in many practical applications such as
Cognitive Radio (CR). However, Nyquist sampling mechanism is costly or
implemented due to wide spectrum range. Taking advantage of sub-Nyquist
sampling technology, some array receiver architectures are proposed to realize
joint estimation of carrier frequency and DOA. To further decrease equivalent
sampling rate and hardware complexity, we propose a simplifying receiver
architecture based on our previous work. We come up with joint DOA and
frequency estimation algorithms for the novel architecture. The simulations
demonstrate that the receiver architecture and the proposed approaches are
feasible.
