It opens the door to a new dynamic way in which the predicted 100 billion IoT devices can operate together in a crowded radio spectrum
Technology innovation firm Cambridge Consultants has successfully completed initial trials of the world’s first fully digital radio transmitter – a turning point in wireless design and a real enabler for the ‘Internet of Things’ (IoT) and 5G technology. It’s a radio built purely from computing power, using the same familiar digital technology you’d find in a computer microprocessor in your home or office.
Unlike ‘software-defined radio’ (SDR), it’s not a mixture of analogue and digital components – for the first time, the radio is completely digital, which can enable new ways of using spectrum intelligently. The innovation is set to be hugely disruptive, like a previous Cambridge Consultants breakthrough – the development of the first single-chip Bluetooth radio, which led to the spinout of the global short-range wireless and audiovisual giant CSR.
The latest breakthrough – codenamed Pizzicato – unlocks the potential of the IoT. It opens the door to a new dynamic way in which the predicted 100 billion IoT devices can operate together in a crowded radio spectrum. And it will enable the creation of 5G systems, with multiple radios and antennas.
The Pizzicato digital radio transmitter consists of an integrated circuit outputting a single stream of bits, and an antenna – with no conventional radio parts or digital-to-analogue converter. Patented algorithms perform the necessary ultra-fast computations in real time, making it possible for standard digital technology to generate high-frequency radio signals directly.
“Our first trial of the technology has created 14 simultaneous cellular base station signals,” said Monty Barlow, director of wireless technology at Cambridge Consultants. “But it is the potential which is so exciting. Like mainstream microprocessing, a Pizzicato-based radio would directly benefit from Moore’s Law – shrinking in cost, size and power consumption with each new generation of silicon fabrication.
“If we’re going to get high-speed broadband to every mobile phone in the world, we’ll need lots of tiny, high-performance radios in those phones. The radios will be squashed together in a way that analogue just doesn’t tolerate. Whereas a Pizzicato-like digital radio can follow Moore’s Law to smaller size and lower power consumption.
“It could also be programmed to generate almost any combination of signals at any carrier frequencies, nimbly adapting its behaviour in a way that is impossible in conventional radios. It is early days for this technology but we believe radio design has reached a turning point.”
In recent decades, wireless design teams such as Cambridge Consultants have employed extensive digital techniques in radios – and such SDRs have provided a tenfold improvement in the data rate that can be squeezed into a radio channel. But a more dramatic improvement is needed to cope with the growth in mobile broadband and the IoT.
Good radio spectrum is a scarce resource – only low frequencies (1GHz or lower) propagate well over distance or through walls, so they are in great demand. Greater efficiency requires the use of dynamic or ‘cognitive wireless’ techniques to sense the radio environment and switch parameters on the fly. This could give access to more of the estimated 90% of the allocated spectrum which is not in use at any one time.
Read more: First all-digital radio transmitter
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