TRANSMISSION SCHEMES FOR MULTI-ANTENNA COMMUNICATION SYSTEMS UTILIZING MULTI-CARRIER MODULATION

• US 20100003931A1
• Filed: 09/11/2009
• Published: 01/07/2010
• Est. Priority Date: 02/25/2003
• Status: Abandoned Application

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Subramaniam, Anand D., Krishnan, Ranganathan, Kadous, Tamer
• Application Number:
  US12/558,073
• Publication Number:
  US 20100003931A1
• Time in Patent Office: Days
• US Class Current: 455/101
• CPC Class Codes: H04B 7/0667 of delayed versions of same signal using space-time coding H04L1/0618
• 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 52/42 in systems with time, space, frequency or polarisation diversity

Abstract

Pilot and data transmission schemes for multi-antenna communication systems utilizing multi-carrier modulation are provided. Subband multiplexing is used to avoid interference resulting from transmitting multiple signals simultaneously from multiple antennas. M usable subbands are initially arranged to form multiple groups of subbands, with each group including a different subset of the usable subbands. Each of T transmit antennas is then assigned one or possibly more subband groups for pilot transmission and typically one subband group for data transmission. Pilot and data may then be transmitted from each antenna on the subbands assigned to that antenna for pilot and data transmission. For each transmit antenna, the transmit power for each assigned subband may be scaled higher such that all of the total transmit power available for the antenna is used for transmission. Pilot and/or data may be transmitted simultaneously from all T antennas on all usable subbands without causing mutual interference.

Claims

1. A method of transmitting in a multi-antenna communication system, comprising:

forming a plurality of groups of subbands with a plurality of subbands, wherein each of the plurality of groups includes a different subset of the plurality of subbands;

assigning each of a plurality of antennas with a different one of the plurality of groups; and

transmitting from the plurality of antennas simultaneously using the plurality of groups of subbands, wherein the transmitting from each antenna occurs on the group of subbands assigned to the antenna.