Base station array receivers in cellular CDMA

A code-division multiple-access (CDMA) scheme using an array receiver is considered. This array receiver is a natural generalization of matched filtering with time functions to matched spaced-time filtering. Computer simulations and mathematical analysis show that the improvement in output SINR per element is simply the increase in energy received by the array, when there are many more users than array elements. When the number of users is less than the number of elements, the array has enough degrees of freedom to null undesired users and the SINR is then significantly greater and only limited by receiver and sky noise