Abstract
In this paper, a multiple-input multiple-output (MIMO) integrated radar and communication system based on orthogonal frequency division multiplexing (OFDM) signals is proposed. We consider a bistatic scenario. Exploiting superimposed pilots and orthogonal space-time block code (OSTBC) precoding, transmitted power can be effectively used in both information symbol sending and target sensing with little energy waste and performance degradation. The expectation maximization (EM) is employed to estimate unknown symbols and the channel jointly, which can take the place of matched filtering in traditional radar. In the EM algorithm, we propose to calculate the channel expectation by using Gaussian distribution of the symbol estimation, which can make full use of the OSTBC property of sensing spatial diversity with fast maximum likelihood decoding. The autocorrelation response, and the Doppler response of moving targets in slow time are verified by numerical experiments. Simulations also show superimposed pilot is suitable in the integrated radar and communication system, even when targets with large Doppler shift exist.
Highlights
It has been gradually realized that wireless communication and radar sensing function should coexist and cooperate with each other in some applications, in order to allow hardware reuse, cost reduction and architecture unification
We propose an orthogonal frequency division multiplexing (OFDM) multiple-input multiple-output (MIMO) integrated radar and communication system exploiting superimposed pilots
One can observe that the precision of the proposed expectation maximization (EM) algorithm using superimposed pilot performs almost the same compared with no unknown information symbols with signal to noise ratio (SNR)>10dB
Summary
It has been gradually realized that wireless communication and radar sensing function should coexist and cooperate with each other in some applications, in order to allow hardware reuse, cost reduction and architecture unification. The OFDM waveform has been widely used in the digital television broadcasting, digital audio broadcasting, digital video broadcasting, wireless local area network, etc This technique offers a number of merits, such as, flexible multi-carrier modulation, the availability of processing gain at the receiver, whitening of the signal spectrum, reduction of the power spectral density [6], and easy synchronization and equalization [7]. We propose an OFDM MIMO integrated radar and communication system exploiting superimposed pilots. It has the ability of delivering information symbols and sensing targets simultaneously, especially with little transmit energy waste or performance deterioration.
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