Apparatus for antenna diversity using joint maximal ratio combining
First Claim
1. A radio communication transceiver in an orthogonal frequency division multiplexed (OFDM) system using k sub-carrier frequencies, comprising:
- a symbol mapping device for mapping a baseband signal to a set of communication symbols;
N plurality of antennas, each antenna associated with a processing path;
each processing path configured to process communication symbols, comprising;
a multiplier configured to multiply the communication symbols with a plurality of complex transmit antenna weights selected for optimized transmission across the bandwidth, each complex transmit antenna weight a function of the k sub-carrier frequencies and having a magnitude and a phase;
whereby N transmit signals are generated, each of which is weighted such that at substantially all sub-carrier frequencies of the OFDM signal, the sum of the power of the transmit signals across the N plurality of antennas of the transceiver is equal to a constant.
0 Assignments
0 Petitions
Accused Products
Abstract
A transceiver using composite beamforming technique is provided wherein a first communication device has a plurality of antennas and the second communication has a plurality of antennas. When the first communication device transmits to the second communication device, the transmit signal is multiplied by a transmit weight vector for transmission by each the plurality of antennas and the transmit signals are received by the plurality of antennas at the second communication device. The optimum transmit weight vector and receive weight vector for communication between the first and second communication devices is determined so that there is effectively joint or composite beamforming between the communication devices.
-
Citations
16 Claims
-
1. A radio communication transceiver in an orthogonal frequency division multiplexed (OFDM) system using k sub-carrier frequencies, comprising:
-
a symbol mapping device for mapping a baseband signal to a set of communication symbols; N plurality of antennas, each antenna associated with a processing path; each processing path configured to process communication symbols, comprising; a multiplier configured to multiply the communication symbols with a plurality of complex transmit antenna weights selected for optimized transmission across the bandwidth, each complex transmit antenna weight a function of the k sub-carrier frequencies and having a magnitude and a phase; whereby N transmit signals are generated, each of which is weighted such that at substantially all sub-carrier frequencies of the OFDM signal, the sum of the power of the transmit signals across the N plurality of antennas of the transceiver is equal to a constant. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 16)
-
-
10. A radio communication transceiver in an orthogonal frequency division multiplexed (OFDM) system using k sub-carrier frequencies that receives a transmitted signal from a first transmitter, comprising:
-
M plurality of antennas, each antenna associated with a processing path; each processing path configured to process communication symbols, comprising; a multiplier configured to multiply the communication symbols with a plurality of complex receive antenna weights that vary with frequency, each complex receive antenna weight a function of sub-carrier frequency and having a magnitude and a phase; and a symbol mapping device for mapping a set of communication symbols to a baseband signal; whereby M receive signals are generated, each of which is weighted by a function of matching to the received signal and a correlation matrix corresponding to the transmitted signal, in which at substantially all sub-carrier frequencies of the OFDM signal, the sum of the power of the transmit signals across the N plurality of transmit antennas of the first transmitter is equal to a constant. - View Dependent Claims (11, 12, 13, 14, 15)
-
Specification