Patent ID: 7995665
Filing Date: 2011-08-09
Classification: H04L

Abstract:
1. A transceiver for use in a multi-input-multi-output (MIMO) Orthogonal Frequency Domain Multiplexing (OFDM) wireless communication system, the transceiver operative to transmit and receive information in the form of fields, the fields including signal fields, the transceiver comprising: a first decoder block of a MIMO OFDM wireless communication system responsive to a first signal field of a preamble of a packet transmitted in a communication channel, the first signal field having been modulated prior to being received by the first decoder, the first decoder block configured to decode the first signal field and operative to generate a first decoded preamble field; a second decoder block of a MIMO OFDM wireless communication system responsive to a second signal field of a preamble of a packet transmitted in a communication channel, the second signal field having been modulated prior to being received by the second decoder, wherein the second decoder block makes a determination as to whether the packet is a single stream packet or a multistream packet; the second decoder block configured to decode the second signal field and operative to generate a second decoded preamble field; a first remodulator of a MIMO OFDM wireless communication system responsive to the first decoded preamble field and operative to generate first remodulated encoded preamble field; when the packet is a multistream packet then the remodulated signal fields are subsequently used to improve a multidimensional channel estimate; and a frequency equalizer update block operative to update coefficients of a frequency equalizer (FEQ) using the first remodulated encoded preamble bits, the FEQ update block causing the FEQ to generate equalized data field output, which are applied to at least one data field, wherein a cyclic shift difference (CSD) between a legacy portion and a high-throughput (HT) portion of the multistream packet is utilized in the estimate.