TAILIEUCHUNG - CDMA Capacity and Coverage

The performance of a CDMA system can be difficult to assess. Link budget calculations can be used to verify performance margins for a particular set of parameters, but fail to tell the “whole” story in an easy to understand, visual way. In this paper, a graphical depiction of CDMA coverage vs. capacity is shown to be a useful tool in evaluating the performance of a CDMA system. The graphical results are used to show scenarios in which CDMA can be both uplink and downlink limited. In particular, it is shown that in either case, the addition of a low noise tower mounted amplifier (TMA) can benefit both. | CDMA Capacity and Coverage CDMA Capacity and Coverage Abstract The performance of a CDMA system can be difficult to assess. Link budget calculations can be used to verify performance margins for a particular set of parameters but fail to tell the whole story in an easy to understand visual way. In this paper a graphical depiction of CDMA coverage vs. capacity is shown to be a useful tool in evaluating the performance of a CDMA system. The graphical results are used to show scenarios in which CDMA can be both uplink and downlink limited. In particular it is shown that in either case the addition of a low noise tower mounted amplifier TMA can benefit both the coverage and the capacity of the CDMA system. The analysis is then extended to demonstrate how a TMA can be used to benefit the uplink performance of a 1xEV-DO data system. Unanswered Questions Is CDMA uplink or downlink limited Is CDMA capacity or coverage limited Is CDMA noise or interference limited Are tower mounted low-noise amplifiers of any benefit in CDMA voice or data applications Literature surveys and conversations with experts will reveal contradictory answers to each of these questions. Often the answers are based on assumptions which are not always stated or even understood. Sometimes the answers are based on equipment limitations rather than on any inherent limitations of CDMA 1 . In other cases the answers are buried so deeply within the mathematics that they are unintelligible to the reader. In reality the answer to each of these questions is it depends. The goal of this paper is to take existing mathematical analyses of CDMA performance and present the results in a way that allows the system designers to understand how various system parameters affect the answers to the above questions. CDMA Capacity and Coverage CDMA Basics The performance of any digital modulation technique can be described in terms of a normalized ratio of energy per bit Eb to noise density No required to achieve the minimum

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