Bezout precoder for transmitter in MIMO communications network

• US 20030235146A1
• Filed: 06/21/2002
• Published: 12/25/2003
• Est. Priority Date: 06/21/2002
• Status: Abandoned Application

• Current Assignee: Mitsubishi Electric Research Laboratories, Inc. (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Electric Research Laboratories, Inc. (Mitsubishi Electric Corporation)
• Inventors: Zhang, Jinyun, Wu, Yunnan, Kung, Sun Yuan
• Application Number:
  US10/176,796
• Publication Number:
  US 20030235146A1
• Time in Patent Office: Days
• US Class Current: 370/203
• CPC Class Codes: H04L 1/06 using space diversity
• CPC Class Codes: H04L 25/0248 Eigen-space methods
• CPC Class Codes: H04W 52/34 TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
• CPC Class Codes: H04W 52/42 in systems with time, space, frequency or polarisation diversity

Abstract

A method transmits data streams in a multiple-input/multiple-output (MIMO) wireless communication systems, where the number of receiving antennas q is less than a number of the transmitting antennas p. The data streams are precoded with a set of finite impulse response filters according to a transfer function of the MIMO channels. The precoded data streams are transmitted over multiple-input/multiple-output channels to a receiver, where the transmitted precoded data stream are detected and decoded to perfectly recover the plurality of data streams without the use of an equalizer.

Claims

1. A method for transmitting a plurality of data streams in a multiple-input/multiple-output wireless communication systems, where a number of receiving antennas q is less than a number of the transmitting antennas p, comprising:

preceding the data streams with a set of finite impulse response filters; and

transmitting the precoded data streams over a multiple-input/multiple-output channel to a receiver where the transmitted precoded data stream are detected and decoded to recover the plurality of data streams.

2. The method of claim 1 wherein the finite impulse response filters are linear.

4. The method of claim 1 where q<

p.

5. The method of claim 1 further comprising:

acquiring a transfer function of the multiple-input-multiple-output channel;

constructing a resultant matrix from the transfer function

applying a singular value decomposition to the resultant matrix to design the set of finite impulse response filters.

6. The method of claim 5 the transfer function H(D)H(D) is expressed in terms of coefficient matrices as

H(D)=H₀+H₁D+ . . . +H_d−

1D<sup>d−

1</sup>+H_dD^d, andH(D)=H₀+H₁D+ . . . +H<sub>d−

1</sub>D<sup>d−

1</sup>+H_dD^d,

wherein the resultant matrix is defined as;

7. The method of claim 5 further comprising:

optimizing the set of finite impulse response filters by finding a particular singular value decomposition with a minimum 2-norm.

8. The method of claim 5 further comprising:

feeding back channel information in a frequency division duplex system to acquire the transfer function.

9. The method of claim 1 further comprising:

estimating a reverse channel in a time division duplex system duplex system to acquire the transfer function.

10. The method of claim 1 wherein each finite impulse response filter is a right delay-permissive inverse of an impulse response of the multiple-input/multiple-output channel.

11. The method of claim 1 wherein the precoding eliminates inter-symbol and inter-channel interference, and the receiver only includes basic components for timing recovery, demodulation, and decoding.

12. The method of claim 1 further comprising:

applying a diagonal power control matrix at each transmitter to meet a predetermined signal-to-noise ratio for selected ones of the data streams..

13. The method of claim 1 further comprising:

applying a diagonal power control matrix at each transmitter to meet a predetermined bit error rate for selected ones of the data streams.

14. The method of claim 1 wherein the q receivers are associated with a single user.

15. The method of claim 1 wherein each of the q receivers is associated with a different user.

16. The method of claim 1 wherein the receiver is a cellular telephone with a single antenna.

3. The method of claim wherein there are q×

p finite impulse response filters.

17. An apparatus for transmitting a plurality of data streams in a multiple-input/multiple-output wireless communication systems, where a number of receiving antennas q is less than a number of the transmitting antennas p, comprising:

a precoder to precode the data streams with a set of finite impulse response filters; and

a transmitter configured to send the precoded data streams over a multiple-input/multiple-output channel to a receiver where the plurality of data streams are detected, demodulated, and decoded to perfectly recover the plurality of data streams.