func (cdma *CDMA) DeSpread(InCH gocomm.Complex128Channel, OutCH gocomm.Complex128Channel) {
despcode := vlib.Conj(cdma.SpreadSequence)
var result complex128
for i := 0; i < len(despcode); i++ {
rxchips := (<-InCH).Ch
result += rxchips * cmplx.Conj(despcode[i])
}
var chdataOut gocomm.SComplex128Obj
chdataOut.Ch = result
OutCH <- chdataOut
}
func (cdma *CDMA) DeSpreadBlock(expectedInputSize int, chInway gocomm.Complex128AChannel, OutCH gocomm.Complex128Channel) {
despcode := vlib.Conj(cdma.SpreadSequence)
SF := len(despcode)
despcode = despcode.Scale(1. / (float64(SF)))
if SF == 0 {
panic("Spreading Code not Set")
}
// maxSymbols := expectedInputSize / SF
// rxsymbols := vlib.NewVectorC(maxSymbols)
var recentBuffer vlib.VectorC
for cnt := 0; cnt < expectedInputSize; {
data := <-chInway
rxlen := len(data.Ch)
// log.Printf("\n Received %d samples out of %d/%d ", rxlen, cnt, expectedInputSize)
cnt += rxlen
recentBuffer = append(recentBuffer, data.Ch...)
for {
if recentBuffer.Size() < SF {
break
} else {
// log.Printf("\n Symbol %d Ready to Despread with %d", sym, cnt)
rxchips := recentBuffer[0:SF]
recentBuffer = recentBuffer[SF:]
rxsymbols := vlib.DotC(despcode, rxchips)
var chdataOut gocomm.SComplex128Obj
chdataOut.Ch = rxsymbols
OutCH <- chdataOut
}
}
}
close(chInway)
}