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Unique Word OFDM

Unique Word OFDM

Contact
Dr. Werner Haselmayr

Cooperation
Institute of Signal Processing

Description
Classical OFDM signaling, used in many today's wireless communication standards such as LTE, WLAN and DVB-T, uses a cyclic prefix (CP) to eliminate intersymbol interference from the previous OFDM symbol and it allows for a simple equalization at the receiver. However, since the CP is a repetition of the last samples of the OFDM Symbol, it typically causes a loss in bandwidth efficiency of around 20 %. Unique word OFDM is a novel signaling scheme that overcomes this flaw by replacing the CP by a deterministic sequence, called unique word (UW). In contrast to the CP, the UW can be designed to be used for particular receiver tasks, like channel estimation and/or synchronization. Moreover, UW-OFDM achieves a better error performance than CP-OFDM. However, this performance gain comes at the price of higher complexity for equalization at the receiver. A detailed description as well as relevant projects and publication can be found on the UW-OFDM Homepage provided by the Institute of Signal Processing (UW-OFDM was co-invented by Prof. Huemer).

Our research focus lies on the design and analysis of iterative receivers to achieve optimal performance - in iterative receivers reliability (soft) information is exchanged between a detector and a decoder. Hence, we are currently engaged in the following topics:
  • Design of iterative receivers to achieve optimal performance.
  • Design of low-complexity soft-input soft-output detectors.
  • Investigation of iterative schemes for time-varying channels and impulse noise environments.
Transmit Signal Structure of UW-ODFM (top) and OFDM (bottom): UW is included in the DFT interval while CP is not. UW is deterministic and CP is random.