A system for improving indoor coverage of cellular reception is provided. The system includes an Intelligent receiver and a Pico transmitter. The intelligent receiver demodulates a signal received from a Broadcast radio head (BRH) with a HPHT or a LPLT toplogy through an outdoor high gain rooftop antenna that is externally connected to the intelligent receiver. The intelligent receiver includes an artificial intelligence (AI) or Machine learning (ML) based indoor coverage monitoring unit and a Pico transmitter application. The AI/ML based indoor coverage monitoring unit continuously monitors cellular reception factors of indoor user devices. The AI/ML based indoor coverage monitoring unit predicts an optimal indoor modulation profile and selects a required modulation index required for the indoor user devices. The Pico transmitter application re-broadcasts or relays the demodulated signal, based on an optimal indoor modulation profile required for the indoor user devices.