Low complexity maximum likelihood detection of concatenated space codes for wireless applications

• US 8,731,107 B2
• Filed: 11/30/2012
• Issued: 05/20/2014
• Est. Priority Date: 10/31/1997
• Status: Expired due to Fees

• Current Assignee: AT&T Wireless Services Incorporated (AT&T, Inc.)
• Original Assignee: AT&T Mobility II LLC (AT&T, Inc.)
• Inventors: Tarokh, Vahid, Alamouti, Siavash, Poon, Patrick
• Primary Examiner(s): DEPPE, BETSY LEE
• Application Number:
  US13/691,505
• Publication Number:
  US 20130089162A1
• Time in Patent Office: 536 Days
• Field of Search: 375/265, 375/267, 375/295, 375/299, 714/792, 714/795
• US Class Current: 375/299
• CPC Class Codes: H03M 13/256 with trellis coding, e.g. with convolutional codes and TCM
• CPC Class Codes: H04B 1/0475 with means for limiting noise, interference or distortion H04B1/0483 takes precedence
• CPC Class Codes: H04B 7/0669 using different channel coding between antennas space-time coding H04L1/0618
• CPC Class Codes: H04B 7/0697 using spatial multiplexing
• CPC Class Codes: H04L 1/0054 Maximum-likelihood or sequential decoding, e.g. Viterbi, Fano, ZJ algorithms
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 1/0059 Convolutional codes
• CPC Class Codes: H04L 1/006 Trellis-coded modulation
• CPC Class Codes: H04L 1/0065 Serial concatenated codes
• CPC Class Codes: H04L 1/0618 Space-time coding
• CPC Class Codes: H04L 1/0625 Transmitter arrangements
• CPC Class Codes: H04L 1/0631 Receiver arrangements
• CPC Class Codes: H04L 25/03178 Arrangements involving sequence estimation techniques
• CPC Class Codes: H04L 25/03331 Arrangements for the joint estimation of multiple sequences

Abstract

Good transmission characteristics are achieved in the presence of fading with a transmitter that employs a trellis coder followed by a block coder. Correspondingly, the receiver comprises a Viterbi decoder followed by a block decoder. Advantageously, the block coder and decoder employ time-space diversity coding which, illustratively, employs two transmitter antennas and one receiver antenna.

Claims

1. An apparatus comprising:

a trellis encoder that generates a first symbol and a second symbol; and

a block encoder coupled to receive the first and second symbol and generate a block of symbols, the block of symbols including the first symbol, the second symbol, a complex conjugate of the first symbol and a negative complex conjugate of the second symbol; and

wherein the complex conjugate of the first symbol and the first symbol are supplied to different ones of a first and a second antenna for transmission over different ones of the first and the second antenna and the second symbol and the negative complex conjugate of the second symbol are supplied to different ones of the first and the second antenna for transmission over different ones of the first and the second antenna.

2. The apparatus as recited in claim 1 further comprising the first and second antennas.

3. The apparatus as recited in claim 1 wherein the first and second symbols are transmitted during a first time interval over different ones of the first and second antennas and the complex conjugate of the first symbol and the negative complex conjugate of the second symbol are transmitted during a second time interval over different ones of the first and second antennas.

4. A method comprising:

trellis encoding received data to generate a first symbol and a second symbol;

block encoding the first and second symbols to generate a block of symbols that includes the first and second symbols, a negative complex conjugate of the second symbol, and a complex conjugate of the first symbol; and

supplying the block of symbols for transmission over a plurality of antennas.

5. The method as recited in claim 4 wherein the plurality of antennas comprises a first and a second antenna.

6. The method as recited in claim 5 further comprising transmitting the block of symbols over the first and the second antenna by transmitting the first and second symbols over the first and second antennas, respectively, during a first time period, and transmitting the negative complex conjugate of the second symbol and the complex conjugate of the first symbol over the first and second antennas, respectively, during a second time period.