Coding for large antenna arrays in MIMO networks

• US 8,179,990 B2
• Filed: 09/17/2008
• Issued: 05/15/2012
• Est. Priority Date: 01/16/2008
• Status: Expired due to Fees

• Current Assignee: Mitsubishi Electric Research Laboratories, Inc. (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Electric Research Laboratories, Inc. (Mitsubishi Electric Corporation)
• Inventors: Orlik, Philip V., Matsumoto, Wataru, Molisch, Andreas F., Tao, Zhifeng, Zhang, Jinyun
• Primary Examiner(s): Payne, David C.
• Assistant Examiner(s): Haider, Syed
• Application Number:
  US12/212,609
• Publication Number:
  US 20090262852A1
• Time in Patent Office: 1,336 Days
• Field of Search: 375/259, 375/260, 375/261, 375/262, 375/267, 375/286, 375/295, 375/340, 375/343, 375/346, 375/347, 370/206, 370/208, 370/252, 370/310, 370/329, 370/342, 370/349, 370/487
• US Class Current: 375/267
• CPC Class Codes: H04L 1/0606 Space-frequency coding
• CPC Class Codes: H04L 1/0631 Receiver arrangements
• CPC Class Codes: H04L 1/0662 Limited orthogonality systems
• CPC Class Codes: H04L 1/1816 with retransmission of the same, encoded, message
• CPC Class Codes: H04L 1/1819 with retransmission of additional or different redundancy
• CPC Class Codes: H04L 1/1845 Combining techniques, e.g. code combining

Abstract

A method transmits a sequence of symbols in a multiple-input multiple-output (MIMO) network including a transmitter having a set of transmit antennas and a receiver having a set of receive antennas. The sequence of symbols is represented by a vector S=[S₁ S₂ S₃ S₄]^T of individual symbols, where T is a transpose operator. The individual symbols are transmitted as a transmit matrix

$S=\left[\begin{array}{cccc}{S}_1& -S_2^{*}& S_1& -S_2^{*}\\ S_2& S_1^{*}& S_2& S_1^{*}\\ S_3& -S_4^{*}& -S_3& S_4^{*}\\ S_4& S_3^{*}& -S_4& -S_3^{*}\end{array}\right],$
where * is a complex conjugate, and wherein each column of the matrix S represents the symbols transmitted at each transmission interval, and subscripts index the set of transmit antennas.

Claims

1. A method for transmitting a sequence of symbols S_n in a multiple-input multiple-output (MIMO) network including a transmitter having a set of transmit antennas and a receiver having a set of receive antennas, comprising the steps of:

representing the sequence of symbols by a vector S=[S₁ S₂ S₃ S₄]^T of individual symbols, where T is a transpose operator; and

using a coder transmitting the individual symbols as a transmit matrix is

2. The method of claim 1, wherein the columns are transmitted as a stream of symbols before any feedback from a receiver is expected.

3. The method of claim 1, further comprising:

detecting and decoding after all columns of symbols have been received at a receiver.

4. The method of claim 1, wherein the sequence of symbols is

S=[S₁ S₂ S₃ S₅ S₆ S₇S₈], and the transmit matrix is

5. The method of claim 1, wherein each successive column is transmited at each transmission interval.

6. The method of claim 1, wherein each successive column is transmitted on adjacent sub-carriers using space-frequency block coding.