Parallel In-band signal detection with self-interference suppression for cognitive LTE

Recently, there has been an increasing interest in enhancing the mainstream cellular technology Long Term Evolution Advanced (LTE-A) with cognitive radio as one of the key enablers towards the fifth generation (5G) wireless communications. For dynamically accessing wider range of spectrum bands in a friendly manner, the cognitive LTE system should be able to discover the possible coexisting heterogeneous wireless systems in different bands. To this end, we propose a novel parallel in-band sensing scheme with effective self-interference suppression (SIS) in time and frequency domains, which doesn't require any modification to the existing standard specification or unrealistic a priori knowledge or extra hardware components. Preliminary simulation results show that over 10dB gain in signal-to-noise ratio (SNR) is achieved in detecting DVB-T signal submerged into very strong LTE self-interference.