Performance analysis of LTE-A with 256-QAM

Abstract

Long Term Evolution (LTE) developed by Third Generation Partnership Project (3GPP), is the access part of the Evolved Packet System (EPS). LTE physical layer is based on Orthogonal Frequency Division Multiple Access (OFDMA) with Quadrature Amplitude Modulation (QAM). Although there has been lots of enhancements in the LTE physical layer, yet higher order modulation schemes were not introduced in the specification until Release 12. This paper investigates the performance of L TE with 256-QAM which was introduced in the 3GPP standard in release 12.3 aiming to enhance the spectral efficiency of the system and increase the peak data rates. Bit Error Rate (BER) values were populated for the probable Signal to Noise Ratio (SNR) operating ranges. The results are based on a MATLAB system model simulation. The results demonstrate that LTE-A can adopt the 256-QAM higher order modulation especially for nomadic users.

Impact and compensation of carrier synchronization errors in OFDM signals with very large QAM constellations

“…Figure 7 indicates the derived expressions for 15) and (18) versus 𝜖. As it is seen the approximation made in Equation ( 18) is very accurate.…”

“…Recently, there has been a great interest in high order constellations and some studies have been done on different forms of quadrature amplitude modulation (QAM) constellations [4,[17][18][19][20][21]. The different models that exist for QAM constellation are square QAM (SQAM), rectangular QAM (RQAM), star QAM, cross QAM (XQAM), and hexagonal QAM (HQAM).…”

“…Therefore, ref. [18] studied the performance of LTE with 256‐QAM constellation through MATLAB simulations. In ref.…”

Wireless networks performance enhancement via buffered cooperative communications

“…OFDMA supports a set of variable rates of 6 mega-bits per second (Mbps), 9, 12, 18, 24, 48 and 54 Mbps. The LTE-A system can apply higher modulation schemes (16-QAM and 64-QAM) on a good channel to achieve a reliable higher transmission rate [31]. For sub-carrier channels with poor channel quality and high noise level, the LTE-A system can apply a lower modulation scheme (such as QPSK) to ensure a resilient/reliable data transmission; however at a relatively lower transmission rate [31].…”

“…The LTE-A system can apply higher modulation schemes (16-QAM and 64-QAM) on a good channel to achieve a reliable higher transmission rate [31]. For sub-carrier channels with poor channel quality and high noise level, the LTE-A system can apply a lower modulation scheme (such as QPSK) to ensure a resilient/reliable data transmission; however at a relatively lower transmission rate [31]. The data transmission rate enhancement for cell-edge UEs will significantly improve the average data throughput and QoS of the networks.…”