US 8,149,934 B2 · Wireless communication system using pilot subcarrier allocation

Abstract

A wireless communication system using pilot subcarrier allocation and a method of allocating the pilot subcarriers for use in downlink and uplink communication in a multiple-input multiple-output (MIMO) antenna system using orthogonal frequency division multiplexing (OFDM) modulation are disclosed. The method includes providing a frame structure comprising OFDM symbols in time domain and subcarriers in frequency domain and alternately allocating first pilot subcarriers for a first antenna and second pilot subcarriers for a second antenna in the time and frequency domains, wherein each of the alternating first pilot subcarriers and the second pilot subcarriers is separated by multiple of 9 subcarriers in the frequency domain and further allocated in two contiguous OFDM symbols.

Claims29

Dependent claims

A method of transmitting pilot signals by allocating pilot subcarriers for use in downlink or uplink communication in a multiple-input multiple-output (MIMO) antenna system using orthogonal frequency division multiplexing (OFDM) modulation, the method comprising:

allocating first pilot signals for a first antenna in time and frequency domains comprising OFDM symbols in the time domain and subcarriers in the frequency domain;
allocating second pilot signals for a second antenna in the time and frequency domains;
and
transmitting the first and the second pilot signals to a receiver,
wherein each first pair consisting of one among the first pilot signals and one among the second pilot signals is allocated in two contiguous OFDM symbols,
wherein the first pairs allocated within the same OFDM symbols are allocated in a unit of 9 subcarriers in the frequency domain,
wherein the first pilot signal and the second pilot signal are alternately allocated within each OFDM symbol, and
wherein each of the first pilot signals separated by two OFDM symbols is shifted by multiple of three subcarriers, and each of the second pilot signals separated by two OFDM symbols is shifted by multiple of three subcarriers.

5 more elements

A wireless communication system using orthogonal frequency division multiplexing (OFDM) modulation for downlink or uplink communication, the wireless communication system comprising:

a multiple-input multiple-output (MIMO) antenna;
an OFDM modulator operably connected to the MIMO antenna;
and
a processor operably connected to the OFDM modulator, wherein the processor is configured to allocate first pilot signals for a first antenna and second pilot signals for a second antenna in time and frequency domains comprising OFDM symbols in the time domain and subcarriers in the frequency domain,
wherein each first pair consisting of one among the first pilot signals and one among the second pilot signals is allocated in two contiguous OFDM symbols,
wherein the first pairs allocated within the same OFDM symbols are allocated in a unit of 9 subcarriers in the frequency domain,
wherein the first pilot signal and the second pilot signal are alternately allocated within each OFDM symbol, and
wherein each of the first pilot signals separated by two OFDM symbols is shifted by multiple of three subcarriers, and each of the second pilot signals separated by two OFDM symbols is shifted by multiple of three subcarriers.

5 more elements

Dependencies are inferred from the claim text.

Wireless communication system using pilot subcarrier allocation

Life of this patent

Wireless communication system using pilot subcarrier allocation

Life of this patent

Abstract

Claims29