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Channel estimation schemes for ofdm-mimo systems and their performance evaluation 1.
| Content Provider | CiteSeerX |
|---|---|
| Author | Rathee, Naveen |
| Abstract | High data rates techniques in communication systems have gained considerable attraction in recent years. Orthogonal Frequency Division Multiplexing (OFDM) is a strong candidate for these systems, which is a multi-carrier modulation technique. In OFDM systems, channel estimation is usually performed by sending pilot symbols on sub carriers known at the receiver. The quality of the estimation depends on the pilot arrangement. In this paper we compared the different channel estimation schemes by inserting pilot tones into all of the subcarriers of OFDM symbols with a specific period (Block-type) and (Comb-type). In this paper we also illustrate the minimum requirement of the number of pilots for channel estimation based on Sampling Theorem and other by the use of OFDM linear system. on sub-carriers known at the receiver. The estimation quality depends on the arrangements of pilots. II. Channel Estimation Schemes A. Block-type Arrangement This scheme shown in Fig. 1(a) has been developed under the assumption of slow fading channel, where channel transfer function is not changing rapidly. In this scheme of block-type pilot, OFDM channel estimation symbols are periodically transmitted, in which pilots are used for all sub-carriers. During the block if the channel is constant than there will be no channel estimation error since pilots are sent at all carriers. The estimation can be performed by using either LS or MMSE. |
| File Format | |
| Access Restriction | Open |
| Subject Keyword | Channel Estimation Scheme Ofdm-mimo System Performance Evaluation Channel Estimation Ofdm System Considerable Attraction Communication System Estimation Quality Pilot Symbol Different Channel Estimation Scheme Slow Fading Channel Pilot Tone Strong Candidate Pilot Arrangement Ofdm Symbol Minimum Requirement Sub Carrier High Data Rate Technique Multi-carrier Modulation Technique Block-type Arrangement Channel Transfer Function Channel Estimation Error Specific Period Orthogonal Frequency Division Multiplexing Recent Year Block-type Pilot Ofdm Linear System Ofdm Channel Estimation Symbol |
| Content Type | Text |
| Resource Type | Article |
