Enhanced Data Rates for GSM Evolution is the full name of this standard. It uses an 8PSK modulation and the RLC-non-persistent mode. In this article, we will discuss these features and how they are implemented. We will also cover the differences between 8PSK and RLC-non-persistent modes. Hopefully, this article has given you enough information to know which one is better for you.

Enhanced Data Rates for GSM Evolution

Enhanced Data rates for GSM Evolution, also known as Global Evolution, Enhanced GPRS, or IMT Single Carrier, is a standard for high-speed data transmission that makes use of a backward-compatible extension to the GSM standard. EDDR is a widely adopted technology that allows mobile phones to receive and send more data than before. Despite its new features, it remains backward-compatible, making it an attractive option for businesses and consumers alike.

EDDR2 or Enhanced Data Rates for Global Evolution is a backwards-compatible standard for data transmission over GSM networks. It uses an eight-phase shift key modulation scheme to provide higher data rates than the earlier Gaussian minimum shift keying scheme. With the higher data rates, EDGE can support peak data rates of 384kbps per cell, assuming all eight time slots are used at the same time.

EDGE will allow operators to provide more data with less latency, which will lower response times for all data services. EDGE is expected to generate a third of the traffic and revenue in 2001, when non-voice services begin to increase in importance. It will be easy for operators to introduce EDGE on their networks over time, adding flexibility to the existing network. In the meantime, EDGE will provide a foundation for the introduction of third-generation multimedia services.

  Full Form of PRL

RLC-non-persistent mode

In RLC-non-persistent-mode, the validity of RLC data is established based on a transfer delay threshold, which applies to both the transmitting and receiving endpoints. In the meantime, the sliding RLC window concept is still used to determine the validity of RLC data blocks. If an RLC data block is corrupted, the entire upper-layer IP packet is lost.

The non-persistent RLC mode enables a device to retransmit a failed RLC block when it receives an acknowledgment message (ACK) over an uplink communication channel. This process improves the performance of services that are delay-sensitive. When it comes to retransmitting RLC blocks, a window size determines the maximum delay before reassembling the LLC frame. A trade-off between increased quality and lost RLC blocks must be made in order to get the best performance out of this mode.

The transmission delay associated with the non-persistent mode is less than three seconds. However, for VoIP applications, this delay is much lower. VoIP data packets, for example, have an average delay of about 100 ms. However, for RLC-non-persistent mode, the capacity of a single data block may increase to 16 RLC data blocks, each carrying eight RTP frames.

8PSK modulation

The full form of edge modulation using 8PSK is a multi-channel signal-processing method that is based on a protocol described above. The 8PSK method uses a table of product factors and compresses them eight times. The output signals are then input to the table and the accumulating is performed. This is a substitution of a previous multiplication operation. The following figure illustrates the general procedure for implementing the 8PSK protocol.

  Full Form of FFC

The basic aims of the 8PSK modulation method are to achieve the enhanced data rate specification in GSM. It uses shape filtering and symbol rotation processes to minimize the dynamic range of the signal. This reduces the power amplifier requirement and produces signals that are free of distortion. Aside from that, a shape filter has the function of compressing the signal’s power spectrum and reducing out-of-band emission.

Compared to GMSK, EDGE utilizes 3 bits per symbol instead of the usual two. This allows for a three-fold increase in the maximum data rate. It also requires an improved GPRS radio link controller/media access control layer. As a result, it is much faster than the GPRS-based technology. The full form of edge modulation using 8PSK is designed for packet switched applications.

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