Reception and measurement of MIMO-OFDM signals with a single receiver
First Claim
1. A method of processing a received signal having a first plurality of subcarriers from a first transmitter carried over a first channel and a second plurality of subcarriers from a second transmitter carried over a second channel, wherein the first plurality of subcarriers comprises a first plurality of subcarrier pilots and the second plurality of subcarriers comprises a second plurality of subcarrier pilots, the method comprising:
- estimating a first impairment parameter for the first plurality of subcarrier pilots;
estimating a second impairment parameter for the second plurality of subcarrier pilots;
removing the first estimated impairment parameter from at least one of the first plurality of subcarrier pilots;
removing the second estimated impairment parameter from at least one of the second plurality of subcarrier pilots;
estimating the first channel using the at least one of the first plurality of subcarrier pilots with the impairment parameter removed;
estimating the second channel using the at least of one of the second plurality of subcarrier pilots with the impairment parameter removed; and
decoding the received signal according to Alamouti space-time based coding using the channel estimation of the first channel and the channel estimation of the second channel.
1 Assignment
0 Petitions
Accused Products
Abstract
A method of receiving Multiple Input Multiple Output—Orthogonal Frequency Division Multiple Accessing (MIMO-OFDMA) signals using a single receiver rather than multiple receivers and performing measurements specific to various parts of MIMO-OFDMA systems using all measurable parameters of MIMO-OFDMA systems is disclosed. In addition, a method of receiving and completing impairment estimation of WiMAX MIMO signals using a single receiver according to the IEEE 802.16 standards is provided.
-
Citations
16 Claims
-
1. A method of processing a received signal having a first plurality of subcarriers from a first transmitter carried over a first channel and a second plurality of subcarriers from a second transmitter carried over a second channel, wherein the first plurality of subcarriers comprises a first plurality of subcarrier pilots and the second plurality of subcarriers comprises a second plurality of subcarrier pilots, the method comprising:
-
estimating a first impairment parameter for the first plurality of subcarrier pilots; estimating a second impairment parameter for the second plurality of subcarrier pilots; removing the first estimated impairment parameter from at least one of the first plurality of subcarrier pilots; removing the second estimated impairment parameter from at least one of the second plurality of subcarrier pilots; estimating the first channel using the at least one of the first plurality of subcarrier pilots with the impairment parameter removed; estimating the second channel using the at least of one of the second plurality of subcarrier pilots with the impairment parameter removed; and decoding the received signal according to Alamouti space-time based coding using the channel estimation of the first channel and the channel estimation of the second channel. - View Dependent Claims (2, 3)
-
-
4. A method of processing a received signal having a first plurality of subcarriers from a first transmitter carried over a first channel and a second plurality of subcarriers from a second transmitter carried over a second channel, wherein the first plurality of subcarriers comprises a first plurality of subcarrier pilots and the second plurality of subcarriers comprises a second plurality of subcarrier pilots, the method comprising:
-
estimating a first impairment parameter for the first plurality of subcarrier pilots; estimating a second impairment parameter for the second plurality of subcarrier pilots; removing the first estimated impairment parameter from at least one of the first plurality of subcarrier pilots; removing the second estimated impairment parameter from at least one of the second plurality of subcarrier pilots; estimating the first channel using the at least one of the first plurality of subcarrier pilots with the impairment parameter removed; estimating the second channel using the at least of one of the second plurality of subcarrier pilots with the impairment parameter removed; and decoding the received signal according to Alamouti space-frequency based coding using the channel estimation of the first channel and the channel estimation of the second channel. - View Dependent Claims (5, 6)
-
-
7. A method of processing a received signal having a first plurality of subcarrier pilots from a first transmitter carried over a first channel and a second plurality of subcarriers pilots from a second transmitter carried over a second channel, the method comprising:
-
estimating a first impairment parameter for the first plurality of subcarrier pilots; estimating a second impairment parameter for the second plurality of subcarrier pilots; removing the first estimated impairment parameter from at least one of the first plurality of subcarrier pilots; removing the second estimated impairment parameter from at least one of the second plurality of subcarrier pilots; estimating the first channel using the at least one of the first plurality of subcarrier pilots with the impairment parameter removed; estimating the second channel using the at least of one of the second plurality of subcarrier pilots with the impairment parameter removed; providing a first hypothesis signal which represents a possible variation a signal transmitted by the first transmitter; providing a second hypothesis signal which represents a possible variation of a signal transmitted by the second transmitter; applying the channel estimation of the first channel to the first hypothesis signal; applying the channel estimation of the second channel to the second hypothesis signal; and combining the first hypothesis signal with the first channel estimation applied and the second hypothesis signal with the second channel estimation applied to create a first combined signal estimate. - View Dependent Claims (8, 9, 10, 11, 12)
-
-
13. A method of processing a received signal comprising a first signal from a first transmitter transmitted over a first channel and a second signal from a second transmitter transmitted over a second channel, the method comprising:
-
estimating the first channel; estimating the second channel; providing a first set of hypothesis signals, wherein each hypothesis signal represents a possible variation of the first signal; providing a second set of hypothesis signals, wherein each hypothesis signal represents a possible variation of the second signal; applying the channel estimation of the first channel to the hypothesis signals in the first set; applying the channel estimation of the second channel to the hypothesis signals in the second set; and combining the first set hypothesis signals with the first channel estimation applied and the second set hypothesis signals with the second channel estimation applied to create a set of combined signal estimates; and determining the most accurate combined signal by comparing each combined signal estimate with the received signal. - View Dependent Claims (14, 15, 16)
-
Specification