Circulating code provides a simple way to achieve transmit diversity with stable gain along wide angular coverage, whereas this property is at a cost of degraded range resolution. In this study, a novel transmit diver...
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Circulating code provides a simple way to achieve transmit diversity with stable gain along wide angular coverage, whereas this property is at a cost of degraded range resolution. In this study, a novel transmit diversity technique referred to as joint slow-time coding with circulating code (STCC) is proposed and investigated to solve the above problem. The STCC can be regarded as a coded pulse sequence of circulating code which achieves full bandwidth after synthesising the frequency band of each pulse. It improves the range resolution while maintaining stable gain property of circulating code. At the analysis stage, the transmit ambiguity function (AF) is used to assess the angle-range property of STCC. Based on the transmit AF, a general processing procedure at receive side is derived. Finally, numerical experiments are carried out using simulated data. The performance assessment shows that the proposed technique is superior to circulating code in range resolution and interfering signal suppression.
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