Patent ID: 8170139

Claim:
A communication method corresponding to a centralized multiple-user access case in which a central point transmits different information streams to one or more subscribers, the method comprising the following steps: passing data over time-variable frequency bearers, wherein a frequency bearer of the time-variable frequency bearers is defined as a subset pair of carriers in a channel of a set of frequency channels (RF), and choosing the time-variable frequency bearers by deriving the time-variable frequency bearers from a pseudo-random draw, at a UMAC (Upper MAC) access layer level, before a start of each frame or of a group of frames: preparing a first set of different frequency locations to be used for each symbol (i=1, . . . , I) in each channel used in frames k, k+1, . . . , k+N (N being an integer) for transmission between the central point and a first subscriber A: Pair(nb,ns) A,n,i =draw(n, i) for n: frame No. ranging from k to k+N for i: symbol No. ranging from 1 to I with nb=number of a band to be used ns=number of a sub-band to be used preparing a second set of different frequency locations to be used for each of the symbols (i=1, . . . , I) in each of the channels used in the frames k, k+1, . . . , k+N for transmission between the central point and a subscriber B: nb B,n,i =nb ns B,n,i =(ns A,n,i , +1)modulo NS with NS: number of sub-bands available in a channel, these indices represent either physical values or logical values, at the level of the central point, preparing different symbols (i=1, . . . , I) for sending on the frames k, k+1, . . . , k+N to the different subscribers A, B, C, D, . . . : channels, respective frequency locations in the channel, respective information to be transmitted on these frequency locations, in each node, sending of the set of the channels, of the frequency locations, of the symbols to an LMAC (Lower MAC) part and to a modem (PHY layer), at the UMAC level of before the start of each frame: applying an RF synthesizer of a channel number desired for a frame to come, at the LMAC level, just before each symbol to be transmitted: in the central point, sending to the PHY layer binary information to be transmitted on the respective frequency locations for fabrication by the PHY layer of the symbol to be transmitted, the reception part being totally reciprocal.