Forward and backward RLS-DDCE processing in MIMO-OFDM spatial multiplexing receivers
In this paper we present a novel approach in frequency domain channel estimation technique. Our proposal is based on the recursive least squares (RLS) algorithm combined with the decision making process called decision directed channel estimation (RLS-DDCE). The novelty and key concept of this techn...
| Main Authors: | , , |
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| Format: | Article |
| Language: | deu |
| Published: |
Copernicus Publications
2010-10-01
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| Series: | Advances in Radio Science |
| Online Access: | http://www.adv-radio-sci.net/8/101/2010/ars-8-101-2010.pdf |
| Summary: | In this paper we present a novel approach in frequency domain channel
estimation technique. Our proposal is based on the recursive least squares (RLS)
algorithm combined with the decision making process called decision
directed channel estimation (RLS-DDCE). The novelty and key concept of this
technique is the block-wise causal and anti-causal RLS processing that yields
two independent processing of RLS along with the associated
decisions. Due to the implemented low density parity check (LDPC) code the
receiver operates with soft information, which enables us to introduce a new
modification of the Turbo principle as well as simple addition of the
a-posteriori log-likelihood ratios (LLRs). Although the computational
complexity is increased by both of our approaches, the latter is relatively
less complex than the earlier. Simulation results show that these
implementations outperform the simple RLS-DDCE algorithm and yield lower bit
error rates (BER) and more accurate channel information. |
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| ISSN: | 1684-9965 1684-9973 |