Abstract
We address the problem of high-data-rate orthogonal frequency division multiplexed (OFDM) systems under restrictive bandwidth constraints. Based on recent theoretic results, multiple-input multiple-output (MIMO) configurations are best suited for this problem. In this paper, we examine several MIMO configurations suitable for high rate transmission. In all scenarios considered, perfect channel state information (CSI) is assumed at the receiver. In constrast, availability of CSI at the transmitter is addressed separately. We show that powerful space-time codes can be developed by combining some simple well-known techniques. In fact, we show that for certain configurations, these space-time MIMO configurations are near optimum in terms of outage capacity as compared to previously published codes. Performance evaluation of these techniques is demonstrated within the IEEE 802.11a framework via Monte Carlo simulations.
Highlights
The IEEE 802.11a standard offers data rates ranging from 6 Mbit/s to 54 Mbit/s
We present a performance evaluation of several multiple-input multiple-output (MIMO) configurations within the IEEE 802.11a framework
Considering that this code has two parallel transitions per state; this simulation validates that space-time block coset code (STBCC) are guaranteed to have a diversity order of at least two, which was determined from their code word difference matrices
Summary
The IEEE 802.11a standard offers data rates ranging from 6 Mbit/s to 54 Mbit/s. In systems where channel state information (CSI) is not known to the transmitter, space-time coding (STC) is a bandwidth and power efficient solution for communication over wireless Rayleigh or Rician fading channels. In [4], Tarokh constructed space-time trellis codes (STTC) using design criteria derived for the Rayleigh fading channels, where ideal channel state information is available. The power and rate should be optimally distributed over frequency components of the transmitted signal by an algorithm called water-filling. It briefly summarizes the popular work by Tarokh in [4], and includes the work of Ionescu [8], who developed a new criterion for the coding gain for STC. We summarize the work presented and salient points for future research
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