Bounds on the sum capacity of synchronous binary CDMA channels
IEEE Transactions on Information Theory
| Hi-index | 754.90 |
Let X1,...,Xn be n independent, symmetric random variables supported on the interval [-1,1] and let Sn=sigmai=1 nXi be their sum. We show that the differential entropy of Sn is maximized when X1,...,Xn-1 are Bernoulli taking on +1 or -1 with equal probability and Xn is uniformly distributed