RF signal processing in multi-antenna systems
First Claim
1. A method for processing radio frequency (RF) signals in a multi-antenna system, comprising:
- generating Lt input data streams in a transmitter with t transmit antennas, where t is an integer, and where Lt is an integer less than or equal to t;
modulating the Lt input data streams to RF signals;
switching the RF signals to t RF branches;
applying a phase-shift transformation to the RF branches by a t×
t matrix multiplication operator Φ
1, whose output are t RF signals, and in which entries of the matrix Φ
1 have constant modulus phase-only terms and the modulus phase-only terms adapt to an estimate of an average channel state;
transmitting the t RF signals over a channel by the t transmit antennas;
receiving the transmitted signals in a receiver with r receive antennas, where r is an integer;
applying a phase-shift transformation to the r RF signals by a r×
r matrix multiplication operator Φ
2 to generate r streams;
selecting Lr signal streams from the r streams, where Lr is an integer less than or equal to r;
demodulating the Lr signal streams; and
processing the demodulated Lr signal streams in baseband to recover output data streams corresponding to the input data streams.
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Accused Products
Abstract
A method for antenna subset selection by joint processing in RF and baseband in a multi-antenna systems. Lt input data streams are generated in a transmitter for either diversity transmission or multiplexing transmission. These streams are modulated to RF signals. These signals are switched to the t branches associated with the t transmit antennas, and a phase-shift transformation is applied to the RF signals by a t×t matrix multiplication operator Φ1, whose output are t≧Lt RF signals. These signals are transmitted over a channel by t antennas. The transmitted signals are received by r antennas in a receiver. A phase-shift transformation is applied to the r RF signals by a r×r matrix multiplication operator Φ2. Lr branches of these phase shifted streams are demodulated and further processed in baseband to recover the input data streams.
24 Citations
13 Claims
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1. A method for processing radio frequency (RF) signals in a multi-antenna system, comprising:
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generating Lt input data streams in a transmitter with t transmit antennas, where t is an integer, and where Lt is an integer less than or equal to t; modulating the Lt input data streams to RF signals; switching the RF signals to t RF branches; applying a phase-shift transformation to the RF branches by a t×
t matrix multiplication operator Φ
1, whose output are t RF signals, and in which entries of the matrix Φ
1 have constant modulus phase-only terms and the modulus phase-only terms adapt to an estimate of an average channel state;transmitting the t RF signals over a channel by the t transmit antennas; receiving the transmitted signals in a receiver with r receive antennas, where r is an integer; applying a phase-shift transformation to the r RF signals by a r×
r matrix multiplication operator Φ
2 to generate r streams;selecting Lr signal streams from the r streams, where Lr is an integer less than or equal to r; demodulating the Lr signal streams; and processing the demodulated Lr signal streams in baseband to recover output data streams corresponding to the input data streams. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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2. The method of claim , in which each of the Lt input data stream has a weight, and further comprising:
summing the Lr weighted data streams before the demodulating and decoding.
Specification
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- Resources
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Current AssigneeMitsubishi Electric Corporation
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Original AssigneeMitsubishi Electric Research Laboratories, Inc. (Mitsubishi Electric Corporation)
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InventorsKung, Sun Yuan, Zhang, Xinying, Zhang, Jinyun, Molisch, Andreas
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Primary Examiner(s)Payne; David C.
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Assistant Examiner(s)DSOUZA, JOSEPH FRANCIS A
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Application NumberUS10/629,240Publication NumberTime in Patent Office1,771 DaysField of Search455/41.2, 455/151.2, 455/101, 375/347, 375/267, 375/295, 375/316, 348/554US Class Current375/347CPC Class CodesH04B 7/0691 using subgroups of transmit...H04B 7/0805 with single receiver and an...H04B 7/0857 using maximum ratio combini...H04B 7/0874 using subgroups of receive ...
