Patent ID: 7577209
Filing Date: 2009-08-18
Classification: H04B,H04L,H04W

Abstract:
1. A power allocation and bit loading method for use in a multiple input multiple output (MIMO) system, comprising: choosing a channel model for a targeted installation environment of a multicarrier MIMO device, said channel model having channel statistics that approximate statistics of said targeted installation environment; computing statistical expected values of spatial channel gains using said channel statistics of said channel model; performing water filling power allocation over said expected gain values to determine signal-to-noise ratios (SNRs) for spatial channels; and performing bit loading based on said SNRs of said spatial channels; wherein performing water filling power allocation includes evaluating the expression: where P i is the power of the i th spatial channel, N 0 is the noise power, λ i is the gain of the ith spatial channel, and μ satisfies: where P is the total signal power.