System Access and Synchronization Methods for MIMO OFDM Communications Systems and Physical Layer Packet and Preamble Design
First Claim
1. A transmitter within a communications network, comprising:
- at least two antennas;
processing circuitry configured to;
convert a frequency domain representation of a common sync sequence into a time domain representation; and
transmit the time domain representation twice, preceded by a cyclic prefix of the time domain representation.
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Accused Products
Abstract
A method and apparatus are provided for performing acquisition, synchronization and cell selection within an MIMO-OFDM communication system. A coarse synchronization is performed to determine a searching window. A fine synchronization is then performed by measuring correlations between subsets of signal samples, whose first signal sample lies within the searching window, and known values. The correlations are performed in the frequency domain of the received signal. In a multiple-output OFDM system, each antenna of the OFDM transmitter has a unique known value. The known value is transmitted as pairs of consecutive pilot symbols, each pair of pilot symbols being transmitted at the same subset of sub-carrier frequencies within the OFDM frame.
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Citations
8 Claims
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1. A transmitter within a communications network, comprising:
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at least two antennas; processing circuitry configured to; convert a frequency domain representation of a common sync sequence into a time domain representation; and transmit the time domain representation twice, preceded by a cyclic prefix of the time domain representation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification