UMTS LTE Orthogonal Frequency Division Multiplexing - OFDM

Orthogonal frequency division multiplexing is a process of transmitting several high speed communication channels through a single medium through the use of separate subcarrier channels for each communication channel. The UMTS LTE system uses OFDM in the downlink direction.

When a mobile radio communicates using OFDM, it is assigned to specific subcarrier channels or groups of subcarrier channels within the radio carrier. By distributing data over several subcarriers, OFDM systems allow for very high data transmission rates and work more reliably in multipath environments where some of the subcarriers may be distorted or lost.

This figure shows how OFDM divides a single radio channel into multiple coded sub-channels. This example shows that a high-speed digital signal is divided into multiple lower-speed sub-channels that are independent from each other and can be individually controlled. The OFDM process allows bits to be sent on multiple sub-channels and the channels selected can vary based on the quality of the sub-channel. In this example, a portion of a sub-channel is lost due to a frequency fade. Due to the OFDM encoding process, the missing bits from one channel can be transmitted on other channels.

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UMTS LTE This book explains the basic components, technologies used, and operation of UMTS LTE systems. Discover the key features that LTE systems provide that go beyond the capabilities of existing 2G and 3G mobile systems such as ultra high-speed Internet (100 Mbps+), television (multicast video), and low latency services (packet voice). $19.99 Printed, $16.99 eBook

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