Home of RF and Wireless Vendors and Resources

One Stop For Your RF and Wireless Need

MU-MIMO vs OFDMA | difference between MU-MIMO and OFDMA

This page compares MU-MIMO vs OFDMA and mentions difference between MU-MIMO and OFDMA. MU-MIMO stands for Multi-User Multiple Input Multiple Output and OFDMA stands for Orthogonal Frequency Division Multiple Access.

MU-MIMO

Multi user MIMO

• In MU-MIMO, multiple streams are transmitted at the same time as shown in figure-1. Individual users are targetted via beamforming technique. Hence overall capacity is increased.
• Advantages: It increases capacity, MU-MIMO results in higher speeds per user. It is ideal for high bandwidth applications.
• Application: Used in both uplink and downlink of 802.11ax, in downlink of 802.11ac

OFDMA

OFDM vs OFDMA

• It allocates subcarriers to users based on their needs. Hence OFDMA does not increase capacity but it uses more effectively.
• In OFDM, all the subcarriers of a symbol are allocated dedicately to individual user all the time. Hence resources are wasted if there is no data to be transmitted during that time interval.
• In OFDMA, multiple users can be multiplexed at the same time, each having its on dedicated set of subcarriers. Hence multiple users with varying bandwidth can be scheduled simultaneously. The figure-2 depicts OFDM and OFDMA frame structures. As shown all the subcarriers are allocated at a time to one user dedicately in OFDM. In OFDMA, RU (Resource Unit) made of subchannel and number of symbols are allocated to individual users as shown.
• Advantages: It increases efficiency. It reduces latency. It is ideal for low bandwidth applications.
• Application: Used in cellular wireless technologies such as WiMAX (16e), LTE and 5G. It is also used in 802.11ax.

Conclusion: Both MU-MIMO and OFDMA techniques complement each other.

MU-MIMO and OFDMA RELATED LINKS

Advantages and disadvantages of OFDMA
Difference between OFDM and OFDMA
Multiuser MIMO vs Single User MIMO
Difference between FDM and OFDM

What is Difference between

Difference between SC-FDMA and OFDM
Difference between SISO and MIMO
Difference between TDD and FDD
Difference between 802.11 standards viz.11-a,11-b,11-g and 11-n
Bluetooth vs zigbee
Bluetooth vs zigbee
Fixed wimax vs mobile
wibro vs mobile wimax
Microcontroller vs microprocessor
FDMA vs TDMA vs CDMA
FDM vs TDM
CDMA vs GSM

RF and Wireless Terminologies


Share this page

Translate this page