Nordic Semiconductor Asa

Eivind Sjøgren Olsen

Sverre Wichlund

Wei Li

Ruben Undheim

Daniel Ryan

Meng Cai

Li Wei

A radio communication system, comprising a transmitter and a receiver wherein the transmitter is configured to transmit a multi-block request including control and timing information relating to a subsequent multi-block transmission, the receiver is configured to receive and decode said multi-block request, the transmitter is configured to subsequently transmit the multi-block transmission, wherein the multi-block transmission comprises a series of discrete blocks. Each block comprises a respective data payload and a synchronisation portion, and each synchronisation portion enables synchronisation between the transmitter and receiver when used in combination with the control and timing information, independently of receipt of other blocks in the multi-block transmission.

Method and apparatus for radio communications

A radio receiver device determines whether a digital radio signal includes a predetermined cyclic preamble. An input portion samples the digital radio signal and generates a plurality of samples for storage in a buffer. A first autocorrelator correlates first and second subsets of the samples to generate a first correlation metric, the second subset having been stored in the buffer earlier than said first subset by an even integer multiple of half of the preamble period. A second autocorrelator correlates first and third subsets of the plurality of samples to generate a second correlation metric, the third subset having been stored in the buffer earlier than said first subset by an odd integer multiple of half of the preamble period. A processing portion calculates a difference between the correlation metrics and determines that the radio signal includes the predetermined cyclic preamble when the difference is greater than a threshold value.

Radio synchronization

A radio receiver device is arranged to receive a radio signal including a data packet having an address portion and a payload portion, said radio receiver comprising:

Demodulators

A radio communication apparatus receives or generates a base address seed, and generates data-channel access addresses from the seed. Each access address corresponds to a respective data-channel identifier, and is generated by setting a bit at a common first bit position to the value of a bit at a first common predetermined bit position in the base address seed or in the respective data-channel identifier; by setting a bit at a common second bit position to the bitwise complement of this value; and by setting one or more remaining bit positions in dependence on values at one or more bit positions in the base address seed and one or more bit positions in the respective data-channel identifier that are not the first common predetermined bit position. The apparatus can send or receive a radio data packet comprising an access address from the generated set.

Radio communication method and apparatus for generating data channel access addresses

A radio receiver device is arranged to receive a radio signal modulated with a data packet including an address portion. The radio receiver comprises: The radio receiver device is arranged such that, upon detecting an upcoming timeout event, the demodulation circuit portion sends a timeout warning signal to the address checking circuit portion using a handshaking channel therebetween; said address checking circuit portion being arranged such that, if it receives the timeout warning signal, it stops checking the plurality of demodulated bits for the predetermined bit pattern.

Demodulator for use in radio communication receivers

A method of processing a digitally encoded radio signal () comprising a bit to be determined is disclosed. The method comprises correlating a first bit sequence () comprising the bit with a plurality of predetermined filters (-) to create a first set of filter coefficients (-); calculating () a first likelihood data set () comprising a likelihood of said bit having a given value for each bit position from the first set of filter coefficients. A second bit sequence () comprising the bit at a different position is then correlated with the filters to create a second set of filter coefficients (-), from which a second likelihood data set () is calculated. A soft output bit () comprising a probability weighted bit value from data corresponding to the bit at a first and second bit positions from the first and second likelihood data sets respectively is then calculated.

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Trondheim, Norway

Eivind Sjøgren Olsen