The Quality-Energy Scalable OFDMA Modulation for Low Power Transmitter and VLIW Processor Based Implementation

: The improvement of spectral efficiency comes at the cost of exponential increment of signal processing complexity [1]. Hence, the energy-efficiency of baseband has recently turned out to be the bottleneck when deploying advanced air interfaces such as that in 4G. We advocate the scalable baseband design as a system level technique to aggressively optimize the average computation-load and associated energy-consumption. The key technique is to dynamically scale the baseband processing itself to the user requirement, the environment, the platform, etc. In this paper, we present the scalable design and VLIW processor based implementation of the OFDMA modulator, which is one of the most energy consuming parts of OFDMA and MIMOOFDMA transmitters (in IEEE 802.16e , 3GPP LTE, etc.). Our work enables the OFDMA modulator to scale the modulationaccuracy and computation-load, so that the OFDMA modulator can dynamically reconfigure and work with minimal number of operations, whereas the required ...

• Type: Conference
• Year: 2007
• Where: GLOBECOM
• Authors: Min Li, Bruno Bougard, Eduardo Lopez-Estraviz, André Bourdoux, Liesbet Van der Perre, Francky Catthoor
• Keywords: Average Computation-load, Baseband, Communications, GLOBECOM 2007, OFDMA Modulator