Bandwidth Enhancement of Cellular Broadband Communication

Bandwidth required to transmit a signal or bandwidth of a transmission media plays an important role in any form of communication (wired or wireless). This paper explains the importance of bandwidth and how we can choose modulation technique, multiple access technique and other parameters for broadband communication so that the available bandwidth gets enhanced. The paper compares the majorly used analog to digital encoding technique Delta Modulation (DM) with Pulse Code Modulation (PCM) in terms of required bandwidth for number of users (channels). It was found that DM is better. The probability of error is an important parameter to fix channel capacity. In the analysis, it was found that probability of error for Binary Phase Shift Keying (BPSK) and Orthogonal Frequency-Division Multiplexing (OFDM) is better than Quadrature Phase Shift Keying (QPSK) and Direct Sequence (DS)-Code Division Multiple Access (CDMA) respectively. We can efficiently utilize bandwidth by selecting bandwidth-efficient analog to digital encoding methods like DM and BPSK as modulation techniques, and OFDM-CDMA as multiple access technique with digital equipments. [PUBLICATION ABSTRACT]