Radio devices

A digital radio device, wherein the digital radio device comprises an analog front-end portion and a digital baseband portion, and wherein the digital radio device is configured to:

• receive a radio signal and process said radio signal to produce an incoming bit sequence;
• correlate a first section of the incoming bit sequence with a first correlation sequence corresponding to a first section of a packet to determine a first correlation result, the packet comprising a header portion and a payload portion;
• correlate a second section of the incoming bit sequence with a second correlation sequence corresponding to a second section of the packet to determine a second correlation result, said second section including at least part of the payload portion;
• identify correlation peaks in the first and second correlation results;
• and
• determine a time of arrival of the packet at the digital radio device based on said correlation peaks.

A method of operating a digital radio device configured to receive packets comprising a header portion and a payload portion, the method comprising:

• the digital radio device receiving a radio signal and processing said radio signal to produce an incoming bit sequence;
• correlating a first section of the incoming bit sequence with a first correlation sequence corresponding to a first section of the packet to determine a first correlation result;
• correlating a second section of the incoming bit sequence with a second correlation sequence corresponding to a second section of the packet to determine a second correlation result, said second section including at least part of the payload portion;
• identifying correlation peaks in the first and second correlation results;
• and
• determining whether a valid packet is present in the incoming bit sequence based on said correlation peaks.