Abstract: An Orthogonal Frequency Division Multiplexing (OFDM) communication system with a transmitter and a receiver. The transmitter is arranged to transmit channel estimation sequences on each of a plurality of band groups, or bands, and to transmit data on each of the band groups or bands. The receiver is arranged to receive the channel estimation sequences for each band group or band to calculate channel state information from each of the channel estimation sequences transmitted on that band group or band and to form an average channel state information. The receiver receives the transmitted data, transforms the received data into the frequency domain, equalizes the received data using the channel state information, demaps the equalized data to re-construct the received data as soft bits and modifies the soft bits using the averaged channel state information.

Abstract: Hair is reconfigured by treatment with a composition comprising an enzyme (protein disulphide isomerase) and a cofactor therefor.

Abstract: A process and composition for treating a material comprising wool to ameliorate ageing, mis-shaping and shrinkage employ an enzyme (protein disulphide isomerase) and a cofactor therefor.