Quadrature Phase Shift Keying (QPSK) and 4-QAM (Quadrature Amplitude Modulation) are both digital modulation techniques used in communication systems, but they differ in their modulation schemes and the way they represent information. Let’s delve into the details of the differences between QPSK and 4-QAM: 1. QPSK (Quadrature Phase Shift Keying): Phase Shifts: QPSK uses four … Read more
Quadrature Phase Shift Keying (QPSK) is a digital modulation scheme used in communication systems to transmit data by varying the phase of the carrier signal. Let’s explore the modulation of QPSK in detail: 1. Phase Shift Keying (PSK) Basics: Binary Representation: PSK is a type of digital modulation where the phase of the carrier signal … Read more
Code Division Multiple Access (CDMA) is a digital cellular technology that allows multiple users to share the same frequency band simultaneously. It is a multiple access technique that enables the transmission of multiple signals over the same frequency spectrum by assigning a unique code to each user. CDMA is widely used in mobile communication systems, … Read more
What is Orthogonal Code in CDMA? In Code Division Multiple Access (CDMA) systems, multiple users share the same frequency band simultaneously. To prevent interference and ensure that the signals from different users do not overlap destructively, each user’s data is encoded using a unique spreading code. These spreading codes play a critical role in distinguishing … Read more
What is TD-SCDMA Network Mode? TD-SCDMA stands for Time Division Synchronous Code Division Multiple Access. It is a 3G mobile telecommunications standard developed primarily in China as an alternative to other 3G technologies such as WCDMA and CDMA2000. Unlike other modes, TD-SCDMA uses a combination of Time Division Multiple Access (TDMA) and Code Division Multiple … Read more
Phase Shift Keying (PSK) is a digital modulation technique used in communication systems to transmit data by varying the phase of the carrier signal. 8-PSK, or 8-Phase Shift Keying, is a specific modulation scheme within the PSK family that uses eight different phase shifts to represent a set of three bits per symbol. Let’s explore … Read more
What is the Difference Between 8PSK and QPSK? 8PSK (8 Phase Shift Keying) and QPSK (Quadrature Phase Shift Keying) are both digital modulation techniques used in communication systems to transmit data over radio waves. These modulation schemes are essential in modern wireless communications, particularly in technologies such as 3G, 4G, and satellite communication. Both 8PSK … Read more
Differential Quadrature Phase Shift Keying (DQPSK) and Quadrature Phase Shift Keying (QPSK) are both digital modulation techniques used in communication systems to transmit data by varying the phase of the carrier signal. The primary difference between them lies in how the phase information is encoded and represented in the transmitted signals. Let’s explore the differences … Read more
What is eHRPD Network? eHRPD stands for evolved High Rate Packet Data. It is a network architecture developed to provide a smooth migration path between CDMA-based networks and LTE (Long Term Evolution) networks. Specifically, eHRPD is an evolution of the HRPD (High Rate Packet Data) system, also known as EV-DO (Evolution-Data Optimized), and it enables … Read more
Evolution-Data Optimized (EV-DO) is a wireless broadband standard and a key technology in the evolution of Code Division Multiple Access (CDMA) mobile communication systems. It was developed to enhance data transfer rates over CDMA networks, allowing for faster and more efficient internet access on mobile devices. Let’s explore in detail what EV-DO is, its features, … Read more