Preamble structures for single-input, single-output (SISO) and multi-input, multi-output (MIMO) communication systems

• US 20030072452A1
• Filed: 10/04/2002
• Published: 04/17/2003
• Est. Priority Date: 10/04/2001
• Status: Active Grant

• Current Assignee: Intellectual Ventures II LLC (Intellectual Ventures LLC)
• Original Assignee: BAE Systems Information and Electronic Systems Integration Incorporated (BAE Systems Plc)
• Inventors: Mody, Apurva N., Stuber, Gordon L.
• Granted Patent: US 7,269,127 B2
• Time in Patent Office: Days
• US Class Current: 380/274
• CPC Class Codes: H04B 7/0669 using different channel coding between antennas space-time coding H04L1/0618
• CPC Class Codes: H04L 1/06 using space diversity
• CPC Class Codes: H04L 2027/0095 in a preamble or similar structure
• CPC Class Codes: H04L 25/0226 sounding signals per se
• CPC Class Codes: H04L 27/2607 Cyclic extensions
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 27/26134 Pilot insertion in the transmitter chain, e.g. pilot overlapping with data, insertion in time or frequency domain
• 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

Abstract

A communication system is provided herein for transmitting frames across a channel. The frames may be transmitted in single-input, single-output (SISO) and/or multi-input, multi-output (MIMO) communication systems. One such frame includes at least one training symbol, each having a cyclic prefix and a training block. The time length N_I of the training block is equal to an integer fraction I of the time length of a data block, i.e., N_I=N/I. Furthermore, the time length G of the cyclic prefix is an integer fraction of the time length N_I. For example, G may be equal to N_I/4 or 25% of N_I. The training symbols provide coarse and fine time synchronization, coarse and fine frequency synchronization, channel estimation, and noise variance estimation.

Claims

1. A frame transmitted in a communication system, the frame comprising:

at least one signal structure, each signal structure comprising a preamble structure having a first time length and a data structure having a second time length, each signal structure being transmitted by a corresponding transmit antenna;

each preamble structure comprising at least one training symbol, each of the at least one training symbol having a third time length, each of the at least one training symbol comprising a first cyclic prefix having a time length G and a training block having a time length N_I; and

each data structure comprising at least one data symbol, each of the at least one data symbol having a fourth time length, each of the at least one data symbol comprising a second cyclic prefix having time length G and a data block having a time length N;

wherein N₁ is a first integer fraction of N, and G is a second integer fraction of N_I.