Training symbol format for adaptively power loaded MIMO

• US 20090207928A1
• Filed: 04/22/2009
• Published: 08/20/2009
• Est. Priority Date: 12/29/2004
• Status: Abandoned Application

• Current Assignee: Qinghua Li, Xintian E. Lin
• Original Assignee: Qinghua Li, Xintian E. Lin
• Inventors: Lin, Xintian E., Li, Qinghua
• Application Number:
  US12/386,748
• Publication Number:
  US 20090207928A1
• Time in Patent Office: Days
• US Class Current: 375/260
• CPC Class Codes: H04B 7/04 using two or more spaced independent antennas
• CPC Class Codes: H04L 1/0618 Space-time coding
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04W 52/346 distributing total power among users or channels

Abstract

Training symbol formats are provided for use in a MIMO based wireless communication system that uses adaptive power loading. In at least one embodiment, a training symbol format is used that is capable of enhancing training symbol signal to noise ratio (SNR).

Claims

1. A method for use in performing channel training in a MIMO based multicarrier system, comprising:

for a first training time slot within a data frame, dividing tones of a first OFDM training symbol among K spatial channels, wherein each of said tones of said first OFDM training symbol is transmitted in only one of said K spatial channels during said first training time slot; and

for a second training time slot within said data frame, dividing tones of a second OFDM training symbol among said K spatial channels, wherein each of said tones of said second OFDM training symbol is transmitted in only one of said K spatial channels during said second training time slot and tones from said first training time slot are not repeated within the same spatial channel in said second training time slot.