What is modulation and coding scheme?

Industrial Wireless Tutorials: Modulation and coding schemes (MCS) are used to determine the data rate of a wireless connection using high-throughput orthogonal frequency division multiplexing (HT-OFDM). In a legacy OFDM system, a symbol contains 288 bits, of which 216 are data and 72 are used for error correction.

Why are different modulation and coding schemes used?

The different EDGE modulation coding schemes are used as required to provide the optimum balance between high data rate and low error rate. As signal levels fall and noise levels rise, the higher levels of error correction are needed to maintain the integrity of the link.

What is Egprs network?

Enhanced GPRS (EGPRS) is an enhancement of a GSM network in which EDGE is introduced on top of the General Packet Radio Service (GPRS) that is used to transfer data in a packet switched mode on several time slots. EGPRS is sometimes also called EDGE Classic. EGPRS is based on the same network architecture as GPRS.

What is the kind of modulation EDGE system used?

Transmission techniques In addition to Gaussian minimum-shift keying (GMSK), EDGE uses higher-order PSK/8 phase-shift keying (8PSK) for the upper five of its nine modulation and coding schemes. EDGE produces a 3-bit word for every change in carrier phase. This effectively triples the gross data rate offered by GSM.

How is convolutional coding applied in GPRS CS-2?

In GPRS Coding Schemes CS-1 through CS-3, the convolutional code is of rate 1/2, i.e. each input bit is converted into two coded bits. In Coding Schemes CS-2 and CS-3, the output of the convolutional code is punctured to achieve the desired code rate. In GPRS Coding Scheme CS-4, no convolutional coding is applied.

What are the coding schemes for packet radio?

The Coding Schemes CS-1 to CS-4 specify the number of parity bits generated by the cyclic code and the puncturing rate of the convolutional code. In Coding Schemes CS-1 through CS-3, the convolutional code is of rate 1/2, i.e. each input bit is converted into two coded bits.

How is channel encoding done in GPRS and edge?

The channel encoding process in GPRS as well as EGPRS/EDGE consists of two steps: first, a cyclic code is used to add parity bits, which are also referred to as the Block Check Sequence, followed by coding with a possibly punctured convolutional code.

How is convolutional coding used in coding schemes?

In Coding Schemes CS-1 through CS-3, the convolutional code is of rate 1/2, i.e. each input bit is converted into two coded bits. In Coding Schemes CS-2 and CS-3, the output of the convolutional code is punctured to achieve the desired code rate. In Coding Scheme CS-4, no convolutional coding is applied.