Multi-Carrier and Spread Spectrum Systems: From OFDM and MC ...

350 SymbolsG l,lGG [j]h(t)h(τ,t)H(f,t)H n,iH l,lI cI TCjJ itKK RiceLL aL bL dmMn(t)nN cN lN fN gridN ISIN pN sN tN tapp(.)P{.}P bP GQrr (k)RR brect(x)R lR slth diagonal element of the equalizer matrix Gequalizer matrixequalizer matrix used for IC in the jth iterationimpulse response of the receive filter or channel impulseresponsetime-variant channel impulse responsetime-variant channel transfer functiondiscrete-time/frequency channel transfer functionlth diagonal element of the channel matrix Hsize of the bit interleaversize√of the Turbo code interleaver−1number of iterations in the multi-stage detectornumber of active usersRice factorspreading code lengthlength of the source bit vector a (k)length of the code bit vector b (k)length of the data symbol vector d (k)number of bits transmitted per modulated symbolnumber of data symbols transmitted per user and OFDMsymboladditive noise signalnoise vectornumber of sub-carrierslth element of the noise vector npilot symbol distance in frequency directionnumber of pilot symbols per OFDM framenumber of interfering symbolsnumber of pathsnumber of OFDM symbols per OFDM framepilot symbol distance in time directionnumber of filter tapsprobability density functionprobabilityBERprocessing gainnumber of user groupsreceived vector after inverse OFDMreceived vector of the kth user after inverse OFDMcode ratebit raterectangular functionlth element of the received vector rsymbol rate