IEEE 802.11AC MIMO transmitter baseband processing on customized VLIW processor

Abstract

This paper presents a software-based implementation for the MIMO transmitter baseband processing conforming to the IEEE802.11ac standard on a DSP core with vector extensions. The transmitter is implemented in four different transmission scenarios, which include 2×2 and 4×4 MIMO configurations, yielding beyond 1Gbps transmit bit rate. The implementation is done for the frequency-domain processing and real-time operation has been achieved when running at a clock frequency of 500MHz. The proposed software solution is evaluated in terms of power consumption, number of clock cycles and memory usage. This SDR based implementation provides improved flexibility and reduced design effort compared to conventional approaches while maintaining energy consumption close to fixed-function hardware solutions.

IEEE 802.11ac MIMO receiver baseband processing on customized VLIW processor

“…This is a suboptimal method for reducing the complexity of the soft bit detection implementation where instead of calculating the distance to all constellations, only the nearest ones are considered. xx1 implementation for these cases was discussed in [7]. In all cases the channel bandwidth is set to 80MHz, which implies that each OFDM symbol contains 256 subcarriers including 234 data, 14 null, and 8 pilot subcarriers.…”

“…Originating from the requirements for fast processing of large amounts of data for such high data rates, a customized VLIW processor with vector processing capabilities is selected as the implementation platform. The work presented in this paper is the continuation of the transmitter implementation of the IEEE 802.11ac PHY layer baseband processing using the same platform presented in [7].…”