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Low Power Radio Module for 868/915MHz Bands

This generic radio module operates at DC-200 kbps data rate, with Gaussian pulse shaping for FSK data and reduced transients. Motivated by battery efficiency and frequency stability, it offers high bandwidth efficiency and low power consumption. Realized with benchtop prototypes achieving zero BER over 3-5 m LOS links. Simulation conducted for system and component level validation.

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Low Power Radio Module for 868/915MHz Bands

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  1. 868/915 MHz Radio Module Generic Low Power DC-200 kbps radio • VCXO MODULATION • Reference crystal oscillator modulation: • DC-200 kbps data rate • Gaussian pulse shaping of FSK data • 65 dB ACPR • Transients greatly reduced • MOTIVATION • Move to less crowded 868MHz (Europe) and 915MHz (US) bands • Battery efficiency • Radio interference issues • Image rejection • Frequency stability • Bandwidth efficiency • “Listen before transmit” • Awareness of radio activity • Power level control • Data rate/coding overhead limitation • LOW POWER ARCHITECTURE • 50% reduction in power consumption • Fivefold increase in data rate • DC balancing of data not required • PLL based superheterodyne architecture • Received Signal Strength Indicator (70 dB range) • Output power level control • REALISATION • Bench top prototypes successfully tested • 3-5 m line of sight links with zero BER • TR868 prototype dimensions: 48 mm x 34 mm • Total unit cost: ~$40 • SIMULATION • ADS Circuit Envelope simulations at system and component level

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